Method of siderite ore processing

FIELD: process engineering.

SUBSTANCE: invention relates to treatment of siderite ores containing large amounts of magnesium oxide (over 9 wt %) and intended for production of two reconnaissance device with high content of iron and high-purity magnesium oxide. Proposed method comprises crushing and sizing of initial ore, magnetising annealing, dry magnetic separation of annealed product and leaching of magnesium oxide from magnetic fraction by acid solution. Magnetising annealing is carried out in conditions inhibiting oxygen entry at 480-650°C for time interval sufficient for decomposition of iron and magnesium decomposition. After magnetic separation, extracted magnetic fraction is additionally crushed to leach magnesium oxide therefrom by carbonic acid solution and to extract magnesium carbonate on heating to 75-100°C to be decomposed to magnesium oxide at 600-750°C.

EFFECT: higher ecological safety.

3 cl, 2 tbl

 

The invention relates to a method of processing sideritic ores containing large amounts of magnesium oxide (more than 9 wt.%), and is designed for simultaneous reception of two products - iron ore concentrate with a high content of iron, magnesium oxide of high purity in an environmentally safe manner.

The high content of magnesium oxide in the ore is difficult for them to Poplavko in blast furnaces due to the receipt of viscous refractory slag. In sideroblastic magnesium carbonate and iron form is isomorphic to the lattice, so the removal of magnesium oxide is impossible without the destruction of such a lattice. This explains the low efficiency of conventional methods of beneficiation of such ore and necessitates the use of thermal and chemical methods. Known way to increase the iron content and reduce the content of magnesium oxide in sideritic ores by crushing and screening the original ore to a particle size 6-0 mm, dry magnetic separation of the original ore in an inhomogeneous magnetic field and subsequent firing of enriched thereby ore and magnetic separation of calcine in an alternating magnetic field [see EN 2283183 C1 IPC B03C 1/00, publ. 10.09.2006]. This method provides an increase in the mass fraction of iron in the concentrate with 54,36% to 59,67% while reducing it of magnesium oxide from 13.00% to 9,92%. The disadvantage of this is the manual is a slight decrease of the content in the concentrate of magnesium oxide. The use of such products in the blast furnace production without adding other ores, reducing the mass percent of magnesium oxide, it is impossible because of the formation of high-viscosity slag during the melting process.

The closest to the invention is a method of preparation of carbonate of iron ore, including crushing, screening source sideritic ores with the subsequent roasting and magnetic separation; the pellet sulfatization concentrate; oxidative roasting of sulfated granules at a temperature of 650-700°C; agitation of the water leaching of the calcine [see Avetura, Vjollca. Sendelbach and other Use of pyro - and hydrometallurgical technologies for the purification of the Baikal sideroblastic ores from magnesium. Innovative processes in complex technologies, environmentally safe processing of mineral and non-traditional raw materials. Materials of international conference "Placencia readings - 2009" s-199]. The disadvantage of this method is that its implementation required the consumption of large quantities of sulfuric acid (100-300 kg of acid per tonne of concentrate). The firing of sulfated pellets carried out at high temperatures, oxides of sulfur that must be captured and disposed of. The use of sulfuric acid and the formation of sulfates in this process leads to the increase of the content with the market in the product, what is undesirable for the blast furnace process. The candle is removed a large portion of manganese, which is a valuable alloying element. In addition, the need for leaching of magnesium sulfate and insoluble calcium sulfate from cinder requires large quantities of water, followed by purification. Thus the use of this method does not receive magnesium, because magnesium sulfate is removed leaching waters. Therefore, the implementation of this method will lead to serious economic and environmental problems.

The technical problem solved by this invention is the simultaneous receipt of sideritic ore with a high content of magnesium oxide (more than 9 wt.%) two products - iron ore concentrate with a high content of iron and magnesium oxide of high purity in an environmentally safe manner.

The problem is solved in that in the method of processing sideritic ores, including crushing and screening of the original ore magnetizing roasting, dry magnetic separation baked product and leaching of magnesium oxide of the magnetic fraction of the acid solution, according to the invention magnetizing roasting is carried out in conditions that prevent the admission of atmospheric oxygen at a temperature of 480-650°C for a time sufficient to decompose CT is the courses of iron and magnesium, after magnetic separation of the extracted magnetic fraction additionally crushed to particle sizes less than 0.5 mm and carry out the leaching of the magnesium oxide with a solution of carbonic acid, and from the resulting solution by heating it up to 75-95°C secrete carbonate of magnesium, which decompose to magnesium oxide by heating to 600 to 750°C.

In the particular case of the solution of carbonic acid, produced by saturation with carbon dioxide.

A solution of carbonic acid can also be obtained by saturation of the solution remaining after precipitation of magnesium carbonate, carbon dioxide.

To obtain a solution of carbonic acid it is advisable to use carbon dioxide formed by magnetizing the burning and decomposition of magnesium carbonate.

The inventive method enrichment sideritic ores is carried out as follows. Source siderite ore is subjected to crushing and screening to a particle size 6-0 mm, which provides a high degree of disclosure intergrowths of the minerals. Magnetizing calcining the thus prepared the original ore is carried out in conditions that prevent the admission of atmospheric oxygen at a temperature of 480-650°C for 1.5-2 hours with constant stirring ore, which creates the same conditions decarbonization ore throughout its volume. Firing in such conditions, according to khimicheskogo the analysis, electron microscopic studies, x-ray microanalysis and imaging technology, ensures the formation of a highly developed surface of the candle and substantially impedes the oxidation of Fe(II) to Fe(III), which prevents the formation of spinel - MgFe2O4from which magnesium oxide is practically not leached coal acid. Annealed samples subjected to dry magnetic separation in a magnetic field 50-250 kA/m, preferably 50 to 100 kA/m Magnetic portion is crushed to particle sizes of 0.3-0 mm, preferably not more than 0.5 mm, and placed in a reactor for leaching, which is conducted with a solution of carbonic acid under pressure of carbon dioxide in the reactor 1-5 ATM for 1-5 hours. Necessary for the leaching solution of carbonic acid obtained when the saturation of water with carbon dioxide, formed by magnetizing the burning and decomposition of magnesium carbonate. Obtained after leaching of magnesium oxide cinder sent for drying, pelletizing and sintering, and from the solution by heating it up to 75-95°C secrete carbonate of magnesium, which decompose to magnesium oxide by heating it to 600 to 750°C. To obtain a solution of carbonic acid can also use the solution remaining after precipitation of magnesium carbonate, filling it with carbon dioxide.

The proposed method for processing sideridou the ore reduces the content of magnesium oxide is not less than 40-60% relative to the initial amount in the ore and to increase the iron content in the product is not less than 4-5%. Necessary for carrying out the leaching process, carbon dioxide is formed by magnetizing the burning and decomposition of magnesium carbonate, i.e. the proposed method is carried out without the use of strong mineral acids, type, sulfuric, and other chemical reagents. When implementing the proposed method all items except magnesium and partly of calcium remain in the solid phase and in solution, however. So there is no need to use large amounts of water for washing the obtained leachate, and the environment does not release harmful substances. For these reasons, the proposed method for processing sideritic ores, which allows to obtain simultaneously two products - iron ore and magnesium oxide of high purity is economically and environmentally more acceptable for practical implementation than the method described in the next version.

Table 1 shows experimental results on leached of magnesium oxide from sideroblast in conditions preventing the admission of atmospheric oxygen, under different settings of burning crude ore, size 6-0 mm, weight 5 kg and composition, wt.%: Fetotal=30,1; Fe2O3=34,6; Fe2O3- 4,6; SiO2=9,4; Al2O3=3,4; CaO=3,7; MgO=9,4; MnO=1,3. Leaching of magnesium oxide from the calcine was performed under the following conditions: particle size on the arch of 0,3-0 mm, the partial pressure of CO2- 1 ATM, stirring to 10 rpm, temperature - 25°C, the relationship between the mass leached cinder and solution of carbonic acid 1:10, the leaching time is 5 hours. The solution after leaching was heated up to 80°C, the selected magnesium carbonate was heated to 650°C with obtaining magnesium oxide.

Table 1
The proportion (wt.%) magnesium oxide relative to its initial amount in the ore is leached from the calcine under various conditions of firing the raw ore.
Firing temperature, °CThe time of firing, hThe share of extracted MgO (wt.%),Firing temperature, °CThe time of firing, hThe share of extracted MgO (wt.%)
45015570152,1
271,557,7
3 10249
480115345
222,5600145,1
330,3244
500135,6339,3
250,2650137,2
352,6235
520155,1700131,5
1,565227
262,28001of 21.2
358,3215
550158,7900115
1,562,8213,2
255,41000110
350,129,5

As can be seen from table 1, the best results for the removal of magnesium oxide are achieved under the following conditions: firing sideral the Zita in the temperature range 520-570°C for 1.5-2 hours. Under these conditions of calcine in the leaching process, is extracted at least 55% of magnesium oxide. The increase in the carbon dioxide pressure to 5 ATM leads to a noticeable acceleration of the process of leaching. For example, 50% of magnesium oxide is extracted from the calcine at a pressure of CO2one atmosphere for 3 hours and at a pressure of CO2five atmospheres for 1 hour 10 minutes (initial ore roasting temperature of 520°C, the duration of the firing 1.5 hours).

To substantiate the advantages of the proposed method in comparison with the closest analogue were experiments on the removal of magnesium oxide from sideroblast by the present method and the method considered as the closest analogue. Table 2 shows the comparative performance of the proposed method and the nearest analogue to remove 50% of magnesium oxide from sideroblast.

Table 2
Comparative characteristics of the proposed method and the nearest analogue to remove magnesium oxide from sideroblast.
Name of operationsConditions of realizationThe results of operations
The inventive method The closest analogueThe inventive methodThe closest analogue
Crushing and screening of the original ore, mm61
Magnetic separation of the original ore1250 kA/mThe increased content: Fe from 30.1 per cent to 36.4%; MgO from 9.4% to 11.3%
Pellet sulfationThe flow rate of 175 kg H2SO4per tonne of concentrate
RoastingFiring at t=520°C; 1.5 hours, without airCalcination at 700°C; 3 hours oxidizing atmosphere (burning in the air)The preparation of the ore for leaching; obtaining CO2for leaching. The increased content: Fe from 30.1 per cent to 43.4%; MgO from 9.4% to 13.4%Preparation of concentrate by leaching. The formation of SO2, CO2. The increased content: Fe from 36.4% to 52.5 per cent; MgO from 11.3% to 12.2%
Magnetic separation burnt ore The magnetic field strength of 50 to 100 kA/mNoThe increased content: Fe from 43.4 per cent to 52.1%; MgO from 9.4% to 13.4%
Leaching of calcine and receipt of iron concentrateA solution of carbonic acid, 3 hours, pressure of CO21 ATM. In the solution passes only the magnesium bicarbonate. The ratio of the mass of candle and a solution of 1:10. Drying, pelletizing and agglomerationWater, 3 hours. Pass into the solution of salt of calcium, magnesium, non ferrous sulfate and manganese Filtration, cake washing 10-fold volume of water, drying, agglomerationThe decrease in MgO from 13.4% to 6.5%. The increase in the content of Fe from 52.1 percent to 56.6%. The other elements remain in the iron concentrateThe decrease in MgO from 12.2% to 6.1%. The increase in the content of Fe 52, 5% to 56.1%. The decrease in Ca content from 3.7 to 1.5%, Mn from 1.3%to 0.5%, other elements remain in the iron concentrate at the same level
Obtaining magnesium oxideThe selection of the oxide of magnesium bicarbonate wayThe allocation of magnesium sulfate from solutionObtaining magnesium oxideReceiving magnesium sulfate

The analysis is shown in table 2 of the results shows that the implementation of the proposed method does not need to raise additional chemical reagents, as for the extraction of magnesium oxide is used carbon dioxide formed during the firing of sideroblast. Therefore, the proposed method is economically and environmentally more acceptable for practical implementation than the method described in the next version.

The inventive method, in addition to iron ore concentrate, allows to obtain magnesia, MgO content not less than 99%, without the need for additional reagents, whereas in the nearest analogue of obtaining magnesia is not provided. In addition, the inventive method of processing sideritic ores allows you to save in iron ore concentrate, manganese and do not produce iron ore concentrate extraneous, undesirable impurities, whereas in the near equivalent of a significant portion of the manganese is removed from the washing water in the form of a soluble sulfate of manganese and iron ore concentrate increased sulfur content.

1. A method of processing sideritic ores, including crushing and screening of the original ore magnetizing roasting, dry magnetic separation baked product and leaching of magnesium oxide of the magnetic fraction of the acid solution, wherein mA is nitisiri the firing conditions preventing the access of atmospheric oxygen at a temperature of 480-650°C for a time sufficient to decompose the carbonates of iron and magnesium, after magnetic separation of the extracted magnetic fraction additionally crushed and carry out the leaching of the magnesium oxide with a solution of carbonic acid, and from the resulting solution by heating it up to 75-100°C secrete carbonate of magnesium, which decompose to magnesium oxide by heating to 600 to 750°C.

2. The method according to claim 1, characterized in that the solution of carbonic acid is produced by saturation with carbon dioxide.

3. The method according to claim 1, characterized in that the solution of carbonic acid is produced by saturation of the solution remaining after precipitation of magnesium carbonate, carbon dioxide.

4. The method according to claim 2 or 3, characterized in that to obtain a solution of carbonic acid using carbon dioxide formed by magnetizing the burning and decomposition of magnesium carbonate.



 

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