Method for processing nickel cobalt extracted from laterite-nickel ore by chloride cycle desiliconisation ferrous process

A technology of laterite nickel ore and desiliconization, applied in the direction of improving process efficiency, can solve the problems of low recovery rate and large investment, and achieve the effects of high nickel and cobalt extraction rate, low operating energy consumption, and increased metal content

Inactive Publication Date: 2008-12-24
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the present technical situation of low-grade complex laterite nickel ore with complex processing technology, large investment and low recovery rate, the present invention adopts enhanced high-efficiency wet chlorination means to achieve wet treatment o

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  • Method for processing nickel cobalt extracted from laterite-nickel ore by chloride cycle desiliconisation ferrous process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] A The laterite nickel ore is crushed, ball milled and passed through a 100-mesh sieve, and the -100-mesh ore is taken for chlorination. The chlorination agent is concentrated hydrochloric acid: the HCl content is greater than 30%.

[0068] B Put the ore powder in a stirred reaction tank with condensing reflux, and carry out stirring and reflux chlorination under normal pressure: the temperature is 105°C; the hydrochloric acid / material ratio is 4.0; the time is 3 hours.

[0069] C Filtrate while hot, wash the residue, and analyze the mother liquor after constant volume. The results confirmed that the comprehensive leaching rate of nickel and cobalt was 92.6%.

Embodiment 2

[0071] A The laterite nickel ore is crushed, ball milled and passed through a 100-mesh sieve, and the -100-mesh ore is taken for chlorination. The chlorination agent is concentrated hydrochloric acid: the HCl content is greater than 30%.

[0072] B Put the ore powder in a stirring reaction tank with condensing reflux, and carry out stirring and reflux chlorination under normal pressure: the temperature is 80°C; the hydrochloric acid / material ratio is 3.0; the time is 5 hours.

[0073] C Filtrate while hot, wash the residue, and analyze the mother liquor after constant volume. The results determined that the comprehensive leaching rate of nickel and cobalt was 90.3%.

[0074] After leaching laterite nickel ore with hydrochloric acid, the contents of nickel and cobalt in the leaching solution (g / L) are: Ni 2.51; Co 0.22; Fe86.3; the acidity of the leaching solution is: H + 1.62mol / L. With this chlorinated solution, the dechlorinated hydrolyzed iron-removing solution is carrie...

Embodiment 3

[0076] A Take the chlorinated liquid into the evaporation crystallization pot with condenser, heat and keep warm at 95°C, stir and volatilize the crude dechlorination; when the pH of the mother liquor is 1.0, the concentration of condensed hydrochloric acid HCl is 6.36mol / L, and the composition of the crude dechlorination liquid (g / L): Ni3.22, Co 0.28, Fe110; pH1.04.

[0077] B. Heat the above crude dechlorination solution to the boiling point of the solution, stir, add a small amount of seed crystal (MgO), and slowly add a small amount of water according to the solid content of the iron hydrolysis process to promote the hydrolysis of iron and ensure sufficient fluidity of the material (liquid content); control Ni / Fe ratio greater than 1.0 as the end point.

[0078] C, filter, wash the filter cake with pH 2.0-2.5 acidic water, and combine the washing liquid with the filtrate. The filter cake is a mixture of iron oxide and iron hydroxide; the composition (g / L) of the deferrif...

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Abstract

The invention provides a method for treating laterite-nickel ores to extract nickel and cobalt by the chloride cycle silicon iron removal method. Ores are crushed and ball-milled to obtain ore powder, the ore powder is added with hydrochloric acid with high concentration used as a chlorinating agent and heated and stirred in the normal pressure for chlorination to obtain a leaching liquid and silicon slag; the leaching liquid and the silicon slag are separated; the leaching liquid is subjected to heating concentration for dechlorination; hydrochloric acid is reclaimed by the simultaneous condensation of HCl and vapor; a silicon removal mother liquid is obtained through filtration washing; the silicon removal mother liquid is subjected to heating evaporation for obtaining vapor; the obtained vapor is condensed into hydrochloric acid by heat reclaiming; simultaneously because of the hydrolytic precipitation of iron caused by deacidification and the condensation of the liquid, the iron slag and the iron removal mother liquid obtained after the filtration washing are separated; the iron removal mother liquid is added with precipitators, and nickel and cobalt collection and nickel deposition mother liquid obtained by deposition are separated; and the nickel deposition mother liquid is subjected to roasting, which makes metal chloride in the mother liquids hydrolyzed into chlorine hydride and metallic oxide, and generate torch firing soot, and the chlorine hydride is subjected to water absorption to regenerate hydrochloric acid for cyclic utilization.

Description

technical field [0001] The invention belongs to the field of non-ferrous metal hydrometallurgy, a process method for extracting valuable metals from low-grade non-ferrous metal oxide ores with high ferrosilicon content, especially a method for extracting nickel and cobalt from low-grade nickel complex laterite nickel ores . Background technique [0002] Laterite nickel ore is an oxide ore containing nickel, and its nickel storage accounts for more than 65% of the total nickel storage. At present, there are mainly two methods for the treatment of laterite nickel ore at home and abroad: fire method and wet method. Generally, lateritic nickel ore is divided into two types: limonite type and magnesite type. Limonite-type ore is high in iron, low in nickel, low in silicon and magnesium, but relatively high in cobalt, and is located in the upper part of the ore deposit; the content of silicon and magnesium in silicon-magnesium-nickel ore is relatively high, the content of iron i...

Claims

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Application Information

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IPC IPC(8): C22B23/00C22B3/10
CPCY02P10/20
Inventor 胡启阳李新海王志兴郭华军
Owner CENT SOUTH UNIV
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