Method of depleting slags from smelting of oxidized nickel ores

FIELD: nonferrous metallurgy.

SUBSTANCE: claimed method comprises combining slags using extraction principle with number of extractions n approaching infinity. Depleting agent efficient in presence of reducing agent is selected from materials enriched with pyrite, pyrrotine, calcium sulfide, and calcium sulfate; metal and alloys mainly containing Si, Al, Fe, C, etc. as well as reducing and sulfidizing complexes consisting of sulfides, oxides, and reducing substances (C, Me). Carbonaceous reducers, utilized individually or in mixture, are any known carbonaceous reducers. Degree of metal Me recovery is in accordance with conventional extraction equation.

EFFECT: increased degree of recovery of nickel from slags, reduced consumption of depleting agent, reduced power consumption and loss of sulfur into gas phase.

6 cl, 1 tbl

 

The invention relates to the metallurgy of Nickel, in particular to technology impoverishment of mine slag smelting of oxidized Nickel ores (NRO). It may be useful to depletion of toxins and melts from melting of predominantly Nickel, copper, lead, antimony, tantalum and other metals.

Ways depletion toxins are very numerous and well known. Widespread ways flotation depletion rich slag Nickel and copper flash smelting [1]. However, the flotation method impoverishment to otvajnym the slag pit melting NRO not applicable.

Widespread also electric furnace ways depletion rich slag Nickel and copper flash smelting [1, s-352; 2], as well as Converter slag Nickel smelting [2].

The closest in technical essence to our invention is a method of depletion mine slag melting NRO using mixtures of pyrite and Corsica, sulphide of calcium and Corsica [2, str-279]. Here the depletion of the slag is carried out in one phase and the slag enters the electric unit to the melt surface. Thus, depletion of the slag is carried out when the number of extraction "n"equal to one, the duration of stay of slag in the furnace for about 2 hours; maximum extraction of Nickel in matte (5.9 to 8.4% of Ni) was 38%; the specific consumption of electricity is - 85-130 kWh/ton of slag. The temperature of the slag - 1420-1480°C. Major disadvantages of this method are: low Nickel recovery; obtaining poor in Nickel matte, the use of pyrite and a high degree of desulphurization (>50%); high flow impoverish mix (2-6% by weight of slag).

The present invention is to increase the extraction of Nickel from toxins in their impoverishment. Along with this there is a reduction of consumption impoverish agent, reduction of specific energy consumption, reduction of losses of sulfur in the gas phase.

This object is achieved in that in the method of depleted slag smelting of oxidized Nickel ores, including siphon intake smelting products from the melting furnace in the anterior horn and the processing of slag impoverish agent containing sulfur-containing material and carbonaceous reducing agent according to the invention, the processing of the slag is carried out in counter-current by downloading impoverish agent on the surface of the directional moving upward flow of slag, with drops impoverish agent, falling down, kollektivet valuable components of the slag, through a counter-current movement, and the expense of impoverishing the support agent is 0.5 to 3.0% by weight of slag.

Processing of the slag is carried out in a separate metallurgical unit, providing a continuous flow of slag and the furnace or hearth.

As the sulfur-containing material impoverish agent can be used individually or in presence of each other materials enriched in pyrite, pyrrhotite, calcium sulfide, calcium sulphate, a metal reducing agents, mainly containing Fe, Si, Al.

As impoverishing agents can be used restorative-sulfiding complexes (VSC) systems: FeS2-CaO-(caso3); FeS2-Fe2O3-C; FeS2-Fe-(CaSO4)-C; FS2-Fe-Cao(caso3)-S.

As the carbonaceous reductant used individually or in mixtures with each other materials taken from the group consisting of metals toxic, sulphur petroleum coke, coal char, coal, including brown and skinny, anthracite, peat, peat coke.

As materials-media SO4can be used not only natural gypsum, but also industrial waste (phosphogypsum, perhaps and others).

The technical result to be obtained from using the proposed technical solution is:

1. Depletion of mine slag melting NRO using the principle of extraction with n (the number of extraction)tending to infinity.

2. The extraction method is depleted mine slag melting allows you to increase the extraction of Nickel from 87-90% (current state) to 95-97%.

3. Opertion is some depletion of Nickel smelting slag allows for process mining smelting almost any part of the Stein, until Feinstein.

4. Depletion of slag can be implemented without significant capital and operating costs.

5. Organization of mining smelting to matte containing Nickel is much more than 12%, reduces the consumption of sulfidization smelting, reducing fuel consumption and transition of sulfur in the gas phase.

The essence of the invention consists in the following. Slag pit melting NRO undergo profound depletion of Nickel and cobalt. This can be done by filing impoverish agent to the molten slag, leaving the shaft furnace, in front of the furnace or a separate melting unit by countercurrent movement of the slag and impoverish agent.

The degree of extraction of the metals (Me) this is in agreement with the classical equation of extraction:

where (IU)oand (Me)n- the concentration of Me in the source and destination slag, respectively;

L - coefficient of the Me distribution between slag and matte (ferronickel);

q - weight matte one extraction;

Q - weight of slag;

n is the number of extraction.

Theoretical calculations using equation (1) showed that for values of n equal to 2, 3 and; the concentration of Nickel in the original slag 0.16%; the value of q, equal to 1.0, and L is 0.01, and using pyrrhotite (FeS1,14in the image quality is as impoverishing agent can obtain the following results:

 n=1n=2n=3n=
The content of Ni in atalina slag, %0,080,040,01<0,001
The content of Ni in matte, %8,0to 12.015,016,0
Removing Ni %50679499

Experimental verification of the above theoretical indicators was conducted in laboratory conditions (table).

In the experiments used mine slag melting NRO on RISCOM Nickel plant composition, %: 0,13 Ni; 20,0 CaO; 12,4 MgO; 41,1 SiO2; 6,8 Al2O3; pyrrhotite from the dissociation of pyrite Gai concentrator, %: 44,0 Fe, 50 S; petroleum coke Perm refinery, %: 3,3 S; 7,8 volatile, 85, 0.3 ash.

Depletion of slag were at a cost (units): slag - 100; pyrrhotite - 1,0; petroleum coke - 0.01 to 0.3. Stein from the second extraction was returned to the depletion of the original slag and matte from the third extraction in the head of the second extraction. Under these conditions, the following results were obtained:

/tr>
 n=1n=2n=3
The content of Ni in atalina slag, %0,080,050,03
The content of Ni in matte, %7,39,011,0
Removing Ni %386177

Table

Examples of the method for depletion dump slag melting of the NRO (in terms of Q slag - 100 t)
Indicators/Examplesno examplesThe placeholder
 123456789101112 
The concentration of Ni in0,120,120,120,120,160,160,160,200,200,500,500,500,16
the original slag             
The number of extraction "n"12332333x)331
Consumption impoverish agents, t:             
- pyrite (95% FeS2)            1,5
- toxic  0,2  0,2      0,3
- pyrrhotite (FeS1,14)1,01,01,00,51,01,02,02,02,03,03,5 2,0 
The concentration of Ni, %:             
- in the final slag0,0700,0420,0240,0480,055to 0.032 0,014<0,010,0080,06<0,010,08
- Stein5,17,9the 9.714.4V10,712,9 9,39,916,414,125,07,3
Removing Ni %426680606680 939998999950
x) data for "n" →settlement

The above experimental data fully confirm the results of theoretical calculations.

We understand that the results of laboratory experiments in industrial services is established will be subject to some adjustment in the direction of a possible reduction of the resulting figures. However, in laboratory conditions, we conducted experiments at values of q equal to 0.5 to 3.0% by weight of the original slag, which showed that the higher values of q higher than 3.0 is impractical (table, example 11), just as impractical and lower q lower than 0.5 (example 4).

In conclusion I must say that as impoverishing agent can be used any sulfidization and/or a metal reducing agent, and any combination of them with each other. Especially useful is the use of metallic reducing agents containing Si, Al, etc. because the process of impoverishment is endothermic. In this case, the use of metal reductants allows you to completely or partially eliminate the need for heating of the slag during its depletion.

For practical implementation does not need any radical reconstruction of the existing equipment as is currently siphon release smelting products that come in front of the furnace where the slag rises to the top surface. Only needed some innovations in the design of the front furnace for the production of slag and feed horn impoverish agent.

There is no need to argue about the possibility of implementing the method in a freestanding stove installation.

Thus, the above data demonstrate the feasibility of p is edlagaemoe technology and indicate the solution of the task.

Sources of information

1. Mechev CENTURIES, Bystrov VP, Tarasov A.V. and other Autogenous processes in non-ferrous metallurgy. M.: metallurgy, 1991, 414 S.

2. Reznik I.D., Ermakov G.P., Schneerson AM Nickel. Volume 2. M: Science and technology, 2001,468 C.

1. The way depleted slag smelting of oxidized Nickel ores, including siphon intake smelting products from the melting furnace in the anterior horn and the processing of slag impoverish agent containing sulfur-containing material and carbonaceous reducing agent, characterized in that the processing of slag impoverish agent is carried out in counter-current by downloading impoverish agent on the surface of the directional moving upward flow of slag, with drops impoverish agent, falling down, kollektivet valuable components of the slag, through a counter-current movement, and the expense of impoverishing agent support in the amount of 0.5 to 3.0% by weight of slag.

2. The method according to claim 1, characterized in that the processing of the slag is carried out in a separate steel unit with continuous flow of slag from the melting furnace or hearth furnaces.

3. The method according to claim 1 or 2, characterized in that as the sulfur-containing material impoverish agent used individually or in presence of each other materials enriched in pyrite, peroration, sulphide of calcium, sulfate, calc what I metal reducing agents, mainly containing Fe, Si, Al.

4. The method according to any one of claims 1 and 2, characterized in that as impoverishing agent use replacement-sulfiding systems of FeS2-CaO(CaCO3)-C; FeS2-Fe2O3-C; FeS2-Fe-(CaSO4)-C; FeS2-Fe-CaO(CaCO3)-C.

5. The method according to any one of claims 1 to 4, characterized in that as the carbonaceous reductant used individually or in mixtures with each other materials taken from the group consisting of metals toxic, sulphur petroleum coke, coal char, coal, anthracite, peat, peat coke.

6. The method according to claim 5 characterized in that the quality of coal used brown and lean coal.



 

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FIELD: nonferrous metallurgy.

SUBSTANCE: claimed method comprises combining slags using extraction principle with number of extractions n approaching infinity. Depleting agent efficient in presence of reducing agent is selected from materials enriched with pyrite, pyrrotine, calcium sulfide, and calcium sulfate; metal and alloys mainly containing Si, Al, Fe, C, etc. as well as reducing and sulfidizing complexes consisting of sulfides, oxides, and reducing substances (C, Me). Carbonaceous reducers, utilized individually or in mixture, are any known carbonaceous reducers. Degree of metal Me recovery is in accordance with conventional extraction equation.

EFFECT: increased degree of recovery of nickel from slags, reduced consumption of depleting agent, reduced power consumption and loss of sulfur into gas phase.

6 cl, 1 tbl

FIELD: converter process with use of oxygen lance.

SUBSTANCE: proposed method is used for converter processes such as AOD, MRP, AOD-L, MRP-L, CLU, ASM, Conars-Stainless steel, or vacuum processes such as VOD, SS-VOD, RH and RH with use of oxygen lance. Slag formed at the end of blowing and treatment in converter or vacuum plant is drained and removed in unreduced state; this slag is fed to electric furnace which is loaded with standard charge consisting of metal scrap and residual dust; then carbon is additionally fed and silicon if necessary; during melting, chromium oxide contained is slag is reduced by means of carbon and silicon.

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SUBSTANCE: method comprises steps of multiple crushing for producing at each step slag particles with successively decreased (from step to step) diameters; repeating crushing steps until producing particles with desired final size of their diameter; suspending crushed particles of slag in liquid medium after each crushing step; using slag produced after coal combustion in fire box or in boiler; performing steps of suspending for producing suspension with light and heavy particles, the last include noble metals; separating crushed particles in suspension on base of their mass and individually concentrating light particles and heavy particles; after each suspending step removing light particles from suspension for preparing suspension containing, mainly heavy particles; then trapping heavy particles for further crushing of them in order to produce desired final size of particle diameter.

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10 cl, 2 dwg, 1 tbl, 1 ex

FIELD: nonferrous metallurgy.

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EFFECT: reduced cobalt and nickel loss and lowered power and reagent consumption.

1 tbl, 2 ex

FIELD: ferrous metallurgy; preparation of samples of metallurgical slags for chemical analysis.

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3 tbl, 1 ex

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1 dwg, 8 tbl, 8 ex

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3 cl, 1 dwg, 1 ex

FIELD: nonferrous metallurgy; methods of conversion of the metallothermic slag.

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8 cl, 3 dwg, 5 ex

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SUBSTANCE: proposed method includes reducing-sulfidizing melting in heated unit in presence of sodium sulfate sulfidizing agent. Converter slag is leaned in any heated unit at temperature of from 1350°C to 1500°C. Sodium sulfate is introduced into melt in the amount of 10 to 12%; carbonic reductant is introduced in the amount of 13-15% of mass of slag being leaned. Viscosity of melt and mass of slag are reduced due to reduced melting point.

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3 tbl, 3 ex

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6 cl, 1 dwg

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