Process for extracting nickel and cobalt from laterite-nickel ore

A technology of lateritic nickel ore and nickel-cobalt, applied in the direction of improving process efficiency, etc., can solve the problems of insufficient environmental protection, complicated treatment process, low recovery rate, etc., and achieve the effect of environmental protection process, simple process and fast leaching speed

Inactive Publication Date: 2009-01-07
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of complex processing technology of laterite nickel ore, large investment, low recovery and insufficient environmental protection of the process, and propose a method for extracting nickel and cobalt from laterite nickel ore by using high-efficiency hydrochloric acid leaching. Low consumption, low production cost, high recovery rate of nickel and cobalt, no pollution caused by acid and water closed circuit, friendly to the environment, wide application range of resources

Method used

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  • Process for extracting nickel and cobalt from laterite-nickel ore

Examples

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Effect test

Embodiment 1

[0025] Add water according to the ratio of material to water 1: 1 (wt) to ball mill the laterite nickel ore and pass through a 100 mesh sieve, get the -100 mesh slurry, add water and hydrochloric acid (hydrochloric acid) respectively according to the solid-liquid ratio of 3.5: 1 and the HCl / material ratio of 1.0 Mass percentage concentration more than 35%), stirring.

[0026] Leach according to the following procedure: stirring and leaching at room temperature for 1 hour; then raising the temperature to 40°C, stirring and leaching for 1 hour; and so on, leaching at 60°C, 80°C, and 90°C for 1 hour respectively, and the total leaching time is controlled for 5 hours.

[0027] Filter 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 92.7%.

Embodiment 2

[0029] Add water according to the ratio of material to water 1: 2 (wt) and the laterite nickel ore is ball-milled and passed through a 100-mesh sieve to get the -100-mesh slurry, and add water and hydrochloric acid (hydrochloric acid) respectively according to the solid-to-liquid ratio of 5: 1 and the HCl / material ratio of 1.4 Mass percentage concentration more than 35%), stirring.

[0030] Leach according to the following procedure: raise the temperature to 40°C for 1 hour with stirring and leaching; then raise the temperature to 80°C for 1 hour with stirring and leaching; then raise the temperature to 90°C for 1 hour with stirring and leaching, and control the total leaching time for 3 hours.

[0031] Filter 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 91.3%.

[0032] After leaching laterite nickel ore with hydrochloric acid, the contents of nickel and co...

Embodiment 3

[0034] Take the leachate, heat it to 90°C, stir; add 100g of industrial calcium carbonate per 1000ml of leachate to carry out the first neutralization operation on the leachate, neutralize for 1 hour, filter, and wash slightly; similarly, at 90°C Add 100g of industrial calcium carbonate to the filtrate to perform a second neutralization operation on the first neutralization solution, neutralize for 1 hour, filter, and wash slightly; then perform a third neutralization operation on the second neutralization solution at 90°C And, the amount of calcium carbonate added is based on the pH of the neutral solution at 3.0 to 4.0 as the end point, and the adjustment time is controlled for 1 hour, filtered and washed to obtain a neutralizing solution; the neutralizing solution composition (g / L) Ni 2.14; Co 0.17, pH3. 41.

[0035] Heat the neutralizing solution to 90°C and stir; add sodium sulfide (Na 2 S·9H 2 (0) 20.0g, slowly add sodium sulfide to the neutralization solution, the rea...

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Abstract

The invention discloses a method for extracting nickel and cobalt from a lateritic nickel ore which includes the steps of: (1) preparing the slurry of the ore: cracking the ores and preparing the slurry; (2) dipping the ores with muriatic acid: adding the muriatic acid in the slurry of the ore to carry out stirring and extraction under a normal pressure; (3) separating the solid and liquid; (4) neutralizing an extraction liquid; (4) sulfurizing and depositing the nickel; (6) regenerating the muriatic acid: the mother deposition liquid after nickel depositing is concentrated and roasted, the metal chloride in the mother liquid is hydrolyzed into chlorine hydride and metal oxide; the chlorine hydride after being absorbed by water obtains the regenerated muriatic acid and return to the working procedure of ore extraction; the metal oxide after being cracked and grinded returns to the working procedure of neutralizing. The method of the invention has a simple flow and an environment protective technique; the application range to resources is large; besides, the extraction speed is fast; the impurity removing capacity is high; the extraction rate of the nickel and cobalt is high; the method realizes the closed circulation of HCl and the comprehensive utilization of the resources.

Description

technical field [0001] The invention belongs to the field of nonferrous metal hydrometallurgy, in particular to a method for extracting nickel and cobalt from nickel ore. 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 two main treatment processes for laterite nickel ore at home and abroad: fire method and wet method. Lateritic nickel ore can be divided into two types: limonite type and magnesite type. The limonite type is located in the upper part of the deposit, with high iron, low nickel, low silicon and magnesium, but relatively high cobalt content. This kind of ore should be treated by hydrometallurgy. The silicon-magnesium-nickel ore is located in the lower part of the ore deposit. The content of silicon and magnesium is relatively high, the content of iron and cobalt is relatively low, but the content of nickel is relatively high....

Claims

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Application Information

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Patent Type & Authority Applications(China)
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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