Method to produce nickel matte

FIELD: metallurgy.

SUBSTANCE: agglomerate oxidised nickel ore and fuel reducing agent are loaded into the furnace. Oxygenated blasting is fed to the combustion zone and recovery-sulfided melting is carried out. Supply of oxygenated blasting is performed through the blast tuyeres placed at least at two levels Through the first level of the tuyeres the main blast is supplied, and through the second level of the tuyeres, located above the first level, additional oxygenated blasting is supplied. The distance between the tuyeres of the first and second levels is 660-1000 mm, while the number of primary blasting is greater than the number of additional blasting.

EFFECT: increased efficiency and sustainability of work of the furnace, as well as the melt-through of nickel alongside with reduction of coke consumption.

5 cl, 1 tbl

 

The invention relates to metallurgy, and in particular to methods of processing of laterite Nickel ore.

A method of obtaining Nickel matte through a kiln for pyrometallurgical processing of polymetallic raw materials and the method of processing according to the patent of Russian Federation №2191210. According to this patent the kiln for pyrometallurgical processing of polymetallic raw material contains at least two closely related ovens, one of which is melting furnace with lances, and the other Converter with the outlet - hole and lances, with two furnaces are mutually connected through at least one channel, one end of which is closest to the melting furnace or Converter, immersed in the melt horizontally, above or below the other end. According to the invention the melting furnace designed as neskoromny furnace, in which the injection nozzles for continuous purging of oxygen-containing gas are located at several levels, with the number of levels is 2 to 5 for each metre of height zone remelting polymetallic material, lance shaft furnace is located at the height of the furnace offset the axis of the hole tuyere each subsequent level relative to the previous one, at a distance of 0,35-0,65 distance between the axes of the holes of the tuyeres of the previous level, the Converter will add the eno end provided with U-shaped duct with horizontal outlet-architrave the end through which the sealing gasket is connected with a stationary camera, the horizontal diameter of the Converter (0.32-0.64 in its length, and lance for feeding oxygen-containing gas is placed along the horizontal generatrix of the Converter.

The way pyrometallurgical processing of polymetallic raw materials according to the patent No. 2191210 includes uploading the original charge on the basis of polymetallic raw material in a melting furnace, continuous blowing oxygen-containing gas, melting and flow of liquid metal in the Converter, sucks melt, slag removal, conversion of liquid metal in the Converter by blowing oxygen-containing gas with subsequent supply, if necessary, in the liquid metal flux and production of finished metal or matte. According to the invention as a melting furnace used neskoromny furnace, a continuous supply of blowing oxygen-containing gas is carried out at different levels along the height of the processed polymetallic material when the number of levels of blast from 2 to 5 for every meter of height post poplavskogo polymetallic material through tuyeres located on the outer shell of the shaft furnace with the offset of the axis of the hole tuyere each subsequent level, counting from the bottom, at a distance of 0,35-0,65 distance between the axes of the holes lances previous the ordinary level, at the same or different pressure and flow rate of oxygen-containing gas to the levels of the blast, while blowing oxygen-containing gas is performed under a pressure from 1 to 10 MPa when the flow rate of from 5 to 75 m3/m2min, sucks the liquid metal in the interior of the furnace shaft furnace is carried out for 15-120 min, in the initial charge on the basis of polymetallic concentrate and/or secondary raw materials of various kinds impose additional sulphide concentrates with a particle size of from 30 to 6000 microns and/or coke with a particle size of from 40 to 5000 microns in number 5-55 wt.% the weight used in the smelting of polymetallic material, while the portion of the coke in the charge may be replaced by a blast of natural gas or energy coal in the amount of 0.18-0,78 from the amount of coke in the charge.

A disadvantage of the known method of producing Nickel matte is unstable operation of the shaft furnace and the resulting increased consumption of coke.

The above-mentioned disadvantages due to the fact that during the smelting of Nickel ore, especially legkovosstanovimymi, is an uncontrolled formation of wall accretions of ferronickel, due to the reduction of iron and Nickel from ores, in view of the educational rehabilitation of the environment resulting from the implementation of the recovery reactions of carbon dioxide to carbon monoxide, followed by the absorption of th is.

To monitor the condition of the furnace to prevent nataliopravde and washout wall accretions formed with the help of sulfidization during emergency situations often have a lower level of loading, which reduces the performance of the fusion process (about water) and increases the consumption of fuel (coke). Under intensive nataliapopovalui disrupted normal mode of fusion increases the consumption of coke (to compensate for losses of heat at the location of the reactions with absorption of heat). To eliminate wall accretions takes time to remove them. Education wall accretions indicates the formation of zones with increased recoverability, i.e. with a high content of carbon monoxide. At the formation wall accretions of ferronickel hampered the normal process of melting, sometimes overlapping channel between mountain ovens and remote mountain, interferes with the normal flow of air through tuyeres, is often violated the hydraulic regime in the coke bed. All these processes are accompanied by a decrease in fusion and increased consumption of coke.

The technical result achieved by the invention is improving the performance of the method, increasing the fusion okucani ore or sinter, reduce coke consumption, improving the sustainability of the furnace.

The technical result is achieved due to the fact that the act is both obtain Nickel matte, includes loading into the furnace okucani oxidized Nickel ore and fuel reductant, the supply of the primary oxygen-containing air in the combustion zone, restoration alfileres melting, according to the invention the flow of oxygen-containing blast carried out through tuyeres placed at least at two levels, through tuyeres first level is responsible for the supply of the primary air through the tuyeres of the second level above the tuyeres of the first level, submit additional oxygen blowing, the distance between the lances of the first and second levels is 660-1000 mm, and the number of primary blast is more than the number of additional blast.

The number of primary blast may be not less than 60% of the total number of blast.

It is possible to use the blast enriched with oxygen.

It is possible to use a heated blast.

Lance adjacent levels it is advisable to position relative to each other in a checkerboard pattern.

The process of smelting shaft furnaces is carried out through heat produced by burning fuel. Gaseous combustion products being heated to high temperatures and rising up to meet the descending charge, give in the process of heat exchange a portion of its heat. Thus, the shaft furnace is working on is the principle of countercurrent heated gases rise up, and the cold mixture and coke down. This determines the high utilization of heat of combustion and the continuity of the whole process. Burning fuel in the furnace is not only of purely thermal value, but it defines itself and metallurgical side of the melt, i.e. the productivity of the furnace, the quality of the obtained Nickel matte, etc.

The main combustible component of any fuel is carbon. Therefore, the combustion process of the fuel is considered as a process of combustion of carbon.

Burning is called a chemical reaction of the compounds of oxygen with the combustible substance is carbon, accompanied by evolution of heat.

There are two types of chemical compounds of carbon with oxygen: CO2(carbon dioxide or carbon dioxide) and CO (carbon monoxide).

The combination of carbon with oxygen can occur in two reactions:

With+1/2O2=FROM;

C+O2=CO2.

Reaction With a+1/2O2=WITH is called incomplete combustion reaction, because its product can burn further with the formation of CO2.

The reaction C+O2=CO2called by the reaction of complete combustion.

Both reactions are accompanied by evolution of heat (exothermic reaction).

By reaction With a+1/2O2=WITH outstanding 26420 kcal/mol (110964 kJ/mol)and the reaction C+O2=CO2allocated 94060 kcal/mol (395052 kJ/mol).

In addition to the above reactions possible third reaction is the combustion of CO, since carbon monoxide is able to burn by the reaction CO+1/2O2=CO2. It also generates heat in the number 67640 kcal/mol (284088 kJ/mol).

In industrial furnaces impossible to burn all the carbon in CO2. In the exhaust gases are always present CO2and WITH the. However, a change in combustion conditions, you can adjust the ratio of CO2and in gases, i.e. to change the amount of heat emitted.

Air passing through the layer of coke changes its composition, as the oxygen is consumed by combustion. As a result, the amount of free oxygen gradually decreases. Instead of free oxygen appear gaseous products of combustion of CO2and WITH the. As the flow of air through the layer of coke composition of the produced gas, i.e., the amount of oxygen in it, dioxide and carbon monoxide all the time changes.

The authors of the invention, given the change in the combustion of the composition of the produced gas, its distribution along the height of the furnace and of the processes occurring during the melting of the charge reached the claimed technical result.

Upon receipt Nickel matte according to a known method often is the uncontrolled formation of refractory alloys ferro-Nickel (veronica.lambert) and the education of his snow crusts fail is she in the zone of the feed tuyeres of blast and in the transition channel.

Uncontrolled formation of ferronickel following reason.

As the main reducing agent in the shaft furnace above the tuyeres are primarily carbon monoxide and hydrogen. Since the concentration of hydrogen in the furnace is small, then the main reducing agent is carbon monoxide.

In accordance with the principle of A.a.baikov at temperatures below 570°C reactions occur recovery:

3Fe2O3+FROM=2F3O4+CO2(37,137 MJ)

Fe3O4+kCO=3Fe+(k-4)CO+4CO2(17,166 MJ)

At temperatures above 570°C - response recovery:

3Fe2O3+FROM=2F3O4+CO2(37,137 MJ)

Fe3O4+mCO=3FeO+(m-1)CO+CO2(20,892 MJ)

FeO+nCO=Fe+(n-1)CO+CO2(13,607 MJ)

The recovery of oxides of iron, Nickel and cobalt occur synchronously with the formation of refractory ferro-Nickel alloy), and the recovery of oxides of cobalt is faster. Perhaps this is why the loss of cobalt With more than the loss of Nickel, and the distribution coefficients of cobalt between the matte and the slag is lower than for Nickel. State diagrams of binary systems, Ni-Fe, Ni-Co, Co-Fe form a continuous series of solid solutions, respectively, and ternary system Ni-Co-Fe has a complete mutual solubility. When the ratio of these three metals form a homogeneous alloys with temperature is dependent on the melting point above 1400°C (Hansen M, Anderko X. the structure of double alloys. - M.: Metallurgizdat, 1962, vol. 1, 607, Vol.2 1488; state Diagrams dual-metal systems. Handbook 3 I. Ed. Nepljueva, M.: engineering, 1996-2000; Gasik M.I., Lyakishev N.P., Emlyn B. I. Theory and technology for the production of ferroalloys. - M.: metallurgy, 1988, 784 S.; state Diagrams of metallic systems, VIP-XXXIX. - M.: VINITI, 1959-1992).

Cobalt is also included in the formed refractory alloy, because it is not, the resulting alloy authors call the ferronickel.

The composition shown gases from the tuyere zone to the height of 2100-2400 mm above the tuyere zone has a high content of carbon monoxide, that is restorative in nature. This environment contributes to the restoration of compounds of iron and Nickel and the emergence of high-melting compounds (alloys) and wall accretions of ferronickel, violating the normal trouble-free move of the furnace. This is particularly the case in smelting well-recoverable ore.

Thus, to reduce the reactions coming from the absorption of heat of reaction for the restoration of iron and Nickel with the formation of ferro-Nickel alloy, it is necessary to reduce the volume of responses, followed by selection WITH by afterburning.

The regulation of these reactions is the fact that in the present method are feeding oxygen-containing blast at the level higher than the level p is pout (main) blast not less than 660-1000 mm. The introduction of a second level blast, located on the first level blast at a distance 660-1000 mm) to extend the melting zone and, accordingly, to increase the specific fusion and completeness of extraction of Nickel.

To do this in the oven enter the second level of the tuyeres (most furnaces the level of the tuyere main blast is at an altitude of about 1400 mm from the bottom of the furnace). On existing furnaces on each side of the furnace is up to 15 lances. Accordingly, when used in a shaft furnace heats according to the claimed method in the first and second row of tuyeres will be located, for example, 15 lances on each side of the furnace.

The flow of air through the second level of the tuyeres ensures the implementation of the reaction CO+1/2O2=CO2. Thereby the reduction of the CO content in the furnace, a suppression of reducing atmosphere, contributing to the formation of ferronickel, and reduced volume reactions coming from the absorption of heat.

Education wall accretions due to the fact that during the melting process Nickel ore oxygen-containing blast supplied to the oxygen zone, passes through the coke, and the oxygen blast react with the carbon of coke on the above described reactions.

In this case, as already noted, the reaction of incomplete combustion outstanding amount of heat, so the flax less than when the reaction is complete combustion. Therefore, the reaction of incomplete combustion has less heat relative to the combustion reaction, which is accompanied by cooling of the furnace.

In the process of burning when passing from combustion carbon dioxide CO2it communicates, in turn, with the coke carbon by the reaction: C+CO2=2SD. This reaction is accompanied by absorption of heat (-41220) kcal/mol (173124 kJ/mol), resulting in lowering the temperature in the reaction zone, and increase the resilience of gases due to the formation of carbon monoxide.

A molecule of CO2is linear: O-C-O. Both of the oxygen bond with the carbon equivalent, therefore, the energy 41220 kcal/mol is the energy spent for separation of carbon atoms from the body (pieces) of coke.

During the smelting of oxidized Nickel ores there is no need to support enhanced reductive atmosphere. The more fuel is burned to CO2the better performance of the heat.

In order to reduce the probability of formation wall accretions of ferro-Nickel in the furnace, it is necessary to reduce the concentration of reducing gases (CO) by burning WITH a+1/2O2=CO2simultaneously will be more complete burning of fuel, to expand the area of elevated temperatures that are favorable for melting process, and uvelicivatisea ore raw materials (increase performance).

To do this, the authors proposed to introduce a second level of oxygen-containing blast, located higher than the first main level of the blast 660-1000 mm, which is derived from figure 1.

The distance between the two levels of blast (between the lances of the first level and second level) is selected based on the fact that in this period of intense selection.

Feeding oxygen-containing blast at the level higher than the level of the first blast, we will provide the implementation in the furnace above the level of the reaction CO+1/2O2=CO2that comes with the heat in quantities substantially larger than the reaction of incomplete combustion. Thereby, it becomes possible to compensate for heat losses in the furnace from the reduction reaction of carbon dioxide WITH2.

Thus, the regulation of the recovery environment and the expansion zone of the furnace with high temperature can significantly reduce the probability of formation wall accretions of ferronickel, to improve the stability and performance of furnaces while reducing coke consumption.

Providing a high temperature in the furnace can significantly reduce the probability of formation of wall accretions.

Figure 1 shows the changing composition of the gas environment on the height of the shaft furnace in a cold air blast when applying blast through the first (main) level of the tuyeres (the Rafik, shown in solid line).

When applying blast through the second level of the tuyeres content schedule WITH (the dependence of the CO content on the height of the furnace from the level in the main tuyere has the character depicted by the dashed line. I.e. the CO content is reduced.

Previously to ensure complete combustion to CO2used blast enriched with oxygen. The conditions of combustion are shifted in the direction of more complete combustion and fuel economy. But in these conditions, especially during the smelting easily recoverable ore formation occurs in wall accretions of ferro-Nickel and the resulting disorder (stroke) furnaces, i.e. there is increased recoverability of gas medium and high CO content.

The appropriateness of the location of the tuyeres of the second level in a staggered manner in relation to the tuyeres of the first level is explained by the following.

Between the tuyeres experiencing the greatest shortage of oxygen and creates the highest concentration of carbon monoxide, i.e. reducing conditions, accompanied by absorption of heat (cooling) and at the same time the formation of wall accretions of refractory compounds ferro-Nickel. Therefore, the supply of air in this area and the suppression of the reducing atmosphere leads to the heating of the furnace in this zone, the expansion of the molten zone, the rate of formation of the wall accretions of ferronickel.

All this has a positive effect on the stability of the furnaces, because of sharply reduced emergency stop, eliminating the need for frequent inspection of the condition of furnaces by reducing load. The result is improved productivity of the furnaces, reduced coke consumption. The expected reduction of coke consumption and increase performance more than 15%. Reduced costs of repairs.

The melting process of the oxidized Nickel ores is carried out in fixed-bed combustion of coke. From practice it is known that when the size of the pieces of coke larger than 40 mm are optimal layers of coke (with an average diameter of the pieces of coke 55-65 mm) 180-200 mm For smaller coke requires smaller layers. Uniform distribution of the latter more difficult. Based on this condition, taking into account the specific consumption of coke organized the material in the shaft furnace (coke, fluxes, agglomerates, pellets, sulfidization etc).

Currently, there are several options of technologies related to ore preparation and filing of air in the shaft furnace: air blast, blast enriched with oxygen, heated blast. It should be noted that the improvement of the process of intensification of the process of smelting of Nickel ore was associated with the intensification process of fuel combustion, i.e. intensification of filing blast. However, at the same time, what about with the intensification of the process of fuel combustion decreased allocation ratio between Nickel matte and slag, i.e. increased loss of Nickel from the slag. In addition, in the present smelting of oxidized Nickel ore in a shaft furnace with Stoker combustion high demands to the quality of the fuel (coke), namely it is optimal to use large pieces of coke larger than 40 mm, because when using smaller coke is an increase in consumption. The use of smaller classes of fuel leads to the formation of high amounts of CO, i.e. contributes to the creation of a reducing atmosphere for iron and Nickel, respectively, to the wall accretions of ferro-Nickel.

The experience of the authors shows that when the fixed-bed combustion (coke) with the introduction of the second level of the blast, located at a distance of 660-1000 mm with respect to the first level of the tuyeres requirements as coke, including, to the size of the pieces of coke decreases. Increases the completeness of the chemical potential. For example, when replacing coke larger than 40 mm on coke larger than 25 mm coke consumption will be less change than single blast.

The distribution of the total number of blast on two levels lances, it is expedient to provide in the following amounts:

volume (number) blast into the first primary (lower) level of the tuyeres must be more than the amount of air in the second level (upper level), to exclude who is Innovene second hearth burning fuel;

- optimally blowing mainly in the first (bottom) level of the tuyeres should be at least 60% of the total number of blast.

Figure 2 shows the cross section of the shaft furnace, which is depicted on the left combustion zone and the temperature distribution in the cross section of the furnace at the same level blast (basic); on the right shows the combustion zone and the temperature distribution in the cross section of the furnace at two levels of blast (according to the claimed method).

The results of melting Nickel ores according to the present method are illustrated in the Table.

Where column 1 shows the number of items belonging to different fuel types and conditions of the blast. Decoding column 1 below the Table.

9
№ p/pThe consumption of coke, %The content in the matte, %Content in slag, %Specific fusion, t/m2*dayThe increase in fusion, %Ni/Ni.Reduce coke consumption, %
NiCoSNi S
130to 12.00,2419,650,120,3728,001000
220,44the 10.10,7222,10,160,3843,36063,10
328to 12.00,2419,70,1150,3528,93,0104,46,7
430of 10.720,2119,650,0850,33of 31.8the 3.81270
53010,840,2319,560,060,3628,001800
62812,050,2320,10,1150,3530,07,01056,7
72612,050,2219,80,1100,3632,014,311013,3
825,512,10,2520,50,1050,3532,315,411515,0
25,512,10,2520,50,0780,3632,114,615015,0
1018,510,40,7822,3is 0.1020,3847,7810,2102,0the 11.6
1118,010,50,7622,4is 0.1020,348,5011,8102,011,4

Decoding column 1 of the Table:

1. The metallurgical coke larger than 40 mm, the average size of 60 mm Blowing air without heating, the level of the tuyeres is one (main), smelting ore briquettes.

2. The metallurgical coke larger than 40 mm, the average size of 60 mm Blast enriched with oxygen, the level of the tuyeres is one (main), melting agglomerate.

3. Coke from coal is first mixture with the addition of fusible with the release of volatile substances 17.8% in the amount of 40%; the ash content of coke 8%, a volatile content of coke is 0.7%, the average size of the pieces of coke 68 mm Blowing air without heating, the level of the tuyeres is one (main), smelting ore briquettes.

4. The metallurgical coke larger than 40 mm in the amount of 50% of the total quantity of fuel; lumpy petroleum coke size (40-100 mm) in the amount of 50% of the total fuel. Blowing air without heating, the level of the tuyeres is one (main), smelting ore briquettes.

5. The metallurgical coke larger than 40 mm 50% and anthracite classes (40-100) mm 50%. Blowing air without heating, the level of the tuyeres is one (main), smelting ore briquettes.

6. The metallurgical coke larger than 40 mm, melting briquettes. Air blast without heat (cold blast) with the distribution of the blast through the levels:

- the main (lower) level of 90% of the total number of blast;

- additional (upper) level of 10% of the total number of blast.

An additional layer is located above the main 800 mm

7. The metallurgical coke larger than 40 mm, melting briquettes. Air blast without heat (cold blast) with the distribution of the blast through the levels:

- the main (lower) level of 70% of the total number of blast;

- additional (upper) level of 30% of the total number of blast.

An additional layer is located above the main 800 mm

8. The metallurgical coke larger than 40 mm, melting briquettes. Air is blowing without heat (cold blast) with the distribution of the blast through the levels:

- the main (lower) level of 60% of the total number of blast;

- additional (upper) level of 40% of the total number of blast.

An additional layer is located above the main 800 mm

9. The metallurgical coke larger than 40 mm in the amount of 70% and anthracite classes (40-100 mm) in the amount of 30%, smelting ore briquettes. Air blast without heat (cold blast) with the distribution of the blast through the levels:

- the main (lower) level of 70% of the total number of blast;

- additional (upper) level of 30% of the total number of blast.

An additional layer is located above the main 800 mm

10. The metallurgical coke larger than 40 mm, melting agglomerate. Air blast enriched with oxygen with the distribution of the blast through the levels:

- the main (lower) level of 70% of the total number of blast;

- additional (upper) level of 30% of the total number of blast.

An additional layer is located above the main 800 mm

11. The metallurgical coke larger than 40 mm, melting agglomerate. Air blast enriched with oxygen levels:

- the main (lower) level of 65% of the total number of blast;

- additional (second level), 800 mm above the main - 25% of the total number of blast;

- third level - 1000 mm above the second - 10% from the total consumption of the blast.

The introduction of the third level allows jet to reduce heat loss from chemical nedorogo fuel and at the same time to improve the conditions of service of furnaces (to make them more comfortable), as WITH will be digitise in the layer of the charge and send the heat to the charge, and not to burn on the top, not to worsen the conditions of the ducts, dust collecting devices and smoke exhausters. I.e. the operating conditions of the gas, dust and equipment exhausts.

The total height of the load of 5.0-5.5 m from the level of the tuyeres.

Using the proposed method provides:

1. The normalizing furnaces, facilitating the work of the staff.

2. Reduction of coke consumption and increasing the stability of furnaces by reducing emergency stops (due to the reduction of heat losses in the furnace, reducing reducing atmosphere), which improves the productivity of the furnaces by 5-15%.

3. The decrease of the current (relative) consumption of coke in the working colose 5-10%.

4. Reduce the impact of the quality of coke, including particle size, on the technological characteristics of mine smelting.

5. The efficiency of coke and due to the improvement of environmental conditions due to the reduction of emissions of CO, CO2and SO2.

6. The increase of fusion due to the expansion of the molten zone and increase the length of the furnace operation; reducing the loss of Nickel from the slag.

The expected overall reduction of coke consumption is not less than 15%.

The expected increase in the productivity of blast furnaces - not less than 15%.

1. The method of obtaining Nickel matte, which includes loading into the furnace okucani oxidized Nickel ore and fuel reductant, the supply of the primary oxygen-containing air in the combustion zone, restoration and sulfiding melting, characterized in that the supply of oxygen-containing blast carried out through tuyeres placed on at least two levels, and through tuyeres of the first lower level is responsible for the supply of primary air through tuyeres second level above the tuyeres of the first level, submit additional oxygen blowing, the distance between the lances of the first and second levels is 660-1000 mm, and the number of primary blast is more than the number of additional blast.

2. The method according to claim 1, characterized in that the number of primary blast is not less than 60% of the total number of blast.

3. The method according to claim 1, characterized in that use blast enriched with oxygen.

4. The method according to claim 1, characterized in that use heated blast.

5. The method according to claim 1, characterized in that the lance of the first and second levels are relative to each other in a checkerboard pattern.



 

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3 tbl

FIELD: metallurgy.

SUBSTANCE: procedure consists in reduction of cobalt chloride at heating till production of metal cobalt in form of powder or sponge. Upon reduction they are compressed into rod which is subjected to electron vacuum re-crystallisation to production of crystals of cobalt of high purity. Further, produced crystals are electron re-melted in a cooled crystalliser on each side at total depth not less, than two times for production of flat ingot of cobalt of high structure quality. Also, before reduction cobalt chloride is subjected to zone sublimation when flow of wet argon is transmitted at rate 100 ml/min opposite to transfer of sublimation zone of 50 mm width with length of of initial charge of cobalt chloride 500 mm and at rate of sublimation zone transfer 50 mm/hour with 10 passes at temperature 940-960°C. Upon zone sublimation, 90-95% of initial part of cobalt chloride ingot is separated and the separated part of the ingot of cobalt chloride is subjected to reduction at temperature 750-780°C during 1 hour.

EFFECT: raised processability at production of high purity cobalt designed for thin film metallisation with magnetron target sputtering.

1 ex

FIELD: metallurgy.

SUBSTANCE: procedure consists in production of copper powder in form of cathode sediment, nickel solution and non-soluble slag concentrating sulphur and precious metals. For this purpose alloy is subjected to electro-chemical anode dissolving in water solution. Also, sulphide copper-nickel alloy in form of granules of size 0.5-5.0 mm used as bulk anode is subjected to anode dissolving. Electrolysis is performed at anode density of current 20.0-40.0 A/m2. As source alloy there is used nickel, copper-nickel matte or white matte. Sulphuric acid is used as non-organic acid.

EFFECT: increased completeness of alloy dissolving and transition of sulphur into elementary state.

4 cl, 1 tbl, 3 ex

FIELD: metallurgy.

SUBSTANCE: method for extracting nickel from nickel-containing production solutions of sulphuric underground or heap leaching involves nickel sorption on cation-exchange resin of chelate type with functional group bis(2-piridyl methyl)amino. After sorption the nickel desorption and strippant treatment is performed. Prior to strippant treatment, ferric iron is removed from it by sorption on anion-exchange resin in in the shape of at pH=1.6-2.4.

EFFECT: reducing the number of ferric iron prior to treatment of nickel-containing solutions in order to improve nickel extraction.

1 dwg, 3 tbl

FIELD: metallurgy, in particular complex metal recovery from oxidized ore.

SUBSTANCE: claimed method includes granulation with sulfuric acid. Obtained granules are sulfated at 250-4500C for 1-2 h in one or two steps. Then leaching of nickel and other metal sulfates are carried out followed by metal recovery using known methods. Invention is useful in reprocessing of oxidized nickel-cobalt ores, as well as laterite ores containing nickel, cobalt, and copper, and iron-manganese nickel-containing nodules.

EFFECT: high yield nickel recovery; inexpensive and usable equipment.

3 cl, 3 tbl, 4 ex

FIELD: cobalt and nickel recovery from ores.

SUBSTANCE: claimed method includes ore granulation with sulfuric acid at stoichiometric ratio. Granules are baked at 650-7000C for 2.5-3.0 h up to soluble iron content of 1.0-3.0 % followed by leaching with water. Before baking granules are sulfated at 200-2500C for 1 h.

EFFECT: high yield metal recovery; decreased sulfuric acid consumption; granulated sulfated product without decomposition during leaching with water.

3 cl, 3 tbl, 4 ex

FIELD: reprocessing of oxidized ore by sulfating.

SUBSTANCE: claimed method includes raw treatment with sulfuric acid, transfer of soluble sulfates into solution and roasted product leaching. Batch is baked in gas medium obtained by oxidizing of elementary sulfur of sulfides with air oxygen. Then gases are recycled into sulfuric acid production. Sulfur oxides released during batch baking are utilized together with sulfur oxidation products charged in oven.

EFFECT: prevention of sulfur oxides losses; cobalt and nickel recovery with high yield; reduced fuel consumption.

1 tbl, 3 ex

FIELD: pyro - metallurgical processes in non-ferrous metallurgy.

SUBSTANCE: method comprises steps of melting copper-nickel sulfide concentrates in double-zone furnace with common sulfide bath for enriched matte; in melting zone melting concentrates with use of oxygen-containing raw blast and in reducing zone depleting slag by means of gaseous (liquid) and solid reducing agent. It provides enriched matte of desired composition and slag with metal content corresponding to that of tails.

EFFECT: simplified process for producing target- composition products.

FIELD: hydro-metallurgy; reworking iron cakes containing non-ferrous metals, nickel and cobalt in particular; utilization of by-products of hydro-metallurgy for return of valuable components to technological process.

SUBSTANCE: moist cake is subjected to treatment with sulfuric acid in presence of ferric chloride (III) introduced in the amount of 4.5-7.5 mass-% of FeCl3 relative to Fe2O3 contained in pulp. Then, iron is reduced to bivalent state by sodium sulfite solution at concentration of 150-260 g/l at mass ratio of Fe2O3:Na2SO3=(0.18-0.23):1 at simultaneous deposition of iron in form of ferric sulfite (II) which is subjected to thermolysis in boiling mode continued for 0.5-1.5 h for forming hydrated ferrous oxide (II) which is separated from solution by filtration containing ions of non-ferrous metals; then, it is washed and subjected to heat treatment at 400-440°C for 0.5-1.5 h for forming ferric oxide (III). Thermolysis of ferrous oxide (II) may be performed under rarefaction; sulfur dioxide separated at this is neutralized with soda for obtaining sodium sulfite solution which is directed to iron reduction stage. Ferric chloride (III) solution may be obtained through treatment of part of iron cake in the amount of 3.5-5.5 mass-% of concentrated hydrochloric acid taken in stoichiometric amount relative to iron contained in cake. Proposed method makes it possible to increase extraction of non-ferrous metals iron cake to 96.5-98.5% at simultaneous obtaining ferric oxide (III) powder possessing pigment properties at reduced content of admixtures of non-ferrous metals.

EFFECT: facilitated procedure.

6 cl, 6 ex

FIELD: chemical engineering.

SUBSTANCE: method consists in (i) preliminarily reducing laterite particles in reactor, preferably fluidized-bed reactor, to produce in situ reducing gas via addition of reducing, for example carbon material, into fluidized-bed chamber, (ii) fluidizing the bed with oxidizing gas, and (iii) maintained reactor temperature such as to allow partial combustion of coal and formation of reducing medium. Calcined product with carbon level 1.0 to 1.5 is finally discharged from reactor.

EFFECT: enhanced process efficiency.

26 cl, 2 tbl

FIELD: chemistry.

SUBSTANCE: extractant has bi-phosphorus acid and additionally has tri-phosphate with relation of said components (0,5-1,25):1. Method for producing extractant includes adding to 2-ethylhexanole of chlorine oxide of phosphorus with their relation (4,5-5,1):2,0, and with parameters determined by reaching fullness of passing of reaction, after that reaction mixture is exposed until full removal of formed chlorine hydrogen, then to received mixture 1 mole of water is added, mixture is exposed to full hydrolysis. Then mixture is washed ad water layer is separated from organic remainder, containing said bi-phosphoric acid and tri-phosphate.

EFFECT: higher efficiency.

2 cl, 1 dwg, 2 tbl, 4 ex

FIELD: non-ferrous metallurgy; methods of processing of cobalt-bearing manganese-iron crust formations.

SUBSTANCE: the invention is pertaining to non-ferrous metallurgy and may be used at processing of cobalt, nickel, manganese and copper. The cobalt-bearing manganese-iron oceanic crust formations are crushed to the sizes of the source raw - 90 % - 0.074 mm and leached in 2 stages at the air pressure. On the first stage conduct lixiviation by 3.5-7 % solution of sulfuric acid at the temperature of 15-25°C within 0.5-1.5 hours with the subsequent filtration. On the second stage leach a solid phase by the filtrate of the first stage at pH = 2.5-3.5 at presence of a reducing agent at the mass ratio of the reducing agent to the cobalt-bearing manganese-iron oceanic crust formations as (0.01-0.075):1. The gained solution is filtered with production of a filtrate and a solid phase and reprocess the filtrate with extraction of commercial products. In the capacity of the reducing agent use sodium sulfite, sodium bisulfite, permonosulfuric acid, hydrogen peroxide, hydrogen sulfide, monochlorous copper. The invention ensures a decreased consumption of reactants, increased extraction of cobalt, nickel, manganese and copper.

EFFECT: the invention ensures a decreased consumption of reactants, increased extraction of cobalt, nickel, manganese and copper.

2 cl, 1 dwg, 7 tbl

FIELD: combined processing of copper-nickel cobalt-containing sulfide materials at different copper-to-nickel ratio at obtaining anode copper, high-grade matte and waste slag.

SUBSTANCE: proposed method includes pyro-metallurgical processing of copper-nickel cobalt-containing sulfide materials at different copper-to-nickel ratio accompanied by producing anode copper and nickel slags. High-grade matte is obtained both directly in flash smelting furnace at processing materials at low copper-to-nickel ratio and in converters by processing metallized electric furnace matte together with nickel slag. Proposed method makes it possible to reduce cost of production of high-grade matte and losses of non-ferrous and precious metals, to facilitate procedure of utilization of sulfur dioxide from waste gases and enhancing utilization.

EFFECT: enhanced efficiency; increased volumes of processing nickel slag.

7 cl, 3 dwg, 2 tbl, 5 ex

FIELD: metallurgy; nickel and cobalt metallurgy.

SUBSTANCE: the invention is pertaining to the field of metallurgy, in particular, to nickel and cobalt metallurgy. The method of decoppering of nickel or nickel-cobalt converter matte includes: a primary calcination of the converter matte up to the residual mass share of sulfur from 1.5 up to 2.5 %; a sulfate-chlorinating calcination of a cinder at the temperature from 600°C up to 750°C at presence of a chlorine-containing reactant and oxygen; leaching with the help of the sulfuric acid solution of the water-soluble copper compounds from the chlorinated cinder. At that the primary calcinations of the converter matte is conducted up to a residual mass share of sulfur of no more than 0.3 %, and a sulfate-chlorinating calcination of the cinder is conducted at presence of a chlorine-containing reactant, oxygen and an elemental sulfur. The elemental sulfur is introduced in the reactor of chlorination of the cinder in a mass amount from 50 up to 100 % to the mass of copper in the cinder. At that it allows to achieve selectivity of the copper chlorination, because the cupric oxide is chlorinated better, than nickel and cobalt oxides, and the ratio of nickel to copper in the sulfuric acid solution after the subsequent leaching of the chlorinated cinder in the solution of sulfuric acid is three times lower, than it is in the method of the nearest analog.

EFFECT: the invention allows to achieve selectivity of the copper chlorination, a three times lower ratio of nickel to copper in the solution after the subsequent leaching of the chlorinated cinder in the sulfuric acid solution, than in the method of the nearest analog.

2 cl, 3 tbl, 3 ex

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