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Method for leaching nickel-cobalt from low-grade laterite nickel ore

A laterite nickel ore and low-grade technology, applied in the field of nickel extraction, can solve the problems of large investment and high operating cost, and achieve the effect of less investment, simple process path, and easy industrialization

Inactive Publication Date: 2008-09-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned several processes all have large investment and high operating costs, and are only suitable for processing laterite ores with higher nickel content (nickel ≥ 1.5%)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A. Crushing the ore material, adding water to grind it finely, and controlling the ore pulp to pass through a 100-mesh sieve;

[0026] B. Adjust the -100 mesh pulp by adding water to control the solid-to-liquid ratio of 1:3; the pulp is directly added to the first stage of the 5-stage series leaching tank, and the leaching temperature is maintained at 95°C;

[0027] C, adding industrial hydrochloric acid to the first stage of cascaded leaching tanks according to the ratio of acid to material 0.2:1;

[0028] D. Press SO 2 / material ratio 0.4 measure SO 2 , distributed evenly to each leaching tank according to 5 tanks;

[0029] E. Control the total residence time of the slurry and hydrochloric acid from the first stage to the fifth stage outlet to 60 minutes.

[0030] Through the control of the above conditions, the comprehensive leaching rate of nickel and cobalt in low-grade laterite nickel ore is 92.7%, and the nickel content in the leach solution is ≥3g / L.

Embodiment 2

[0032] A. Crushing the ore material, adding water to grind it finely, and controlling the ore pulp to pass through a 100-mesh sieve;

[0033] B. Adjust the -100 mesh pulp with water to control the solid-to-liquid ratio of 1:5; the pulp is directly added to the first stage of the 6-stage series leaching tank, and the leaching temperature is maintained at 85°C;

[0034] C, adding industrial sulfuric acid to the first stage of cascaded leaching tanks according to the ratio of acid to material 0.5:1;

[0035] D. Press SO 2 Sodium sulfite is measured at a material ratio of 0.2, and is evenly distributed to each leaching tank according to 6 tanks;

[0036] E. Control the total residence time of pulp and sulfuric acid from the first stage to the fifth stage outlet to 100 minutes.

[0037] Through the control of the above conditions, the comprehensive leaching rate of nickel and cobalt in low-grade laterite nickel ore is 91.2%. Through partial return adjustment, the nickel content ...

Embodiment 3

[0039] A. Crushing the ore material, adding water to grind it finely, and controlling the ore pulp to pass through a 100-mesh sieve;

[0040] B. Adjust the -100 mesh pulp with water to control the solid-to-liquid ratio of 1:5; the pulp is directly added to the first stage of the 7-stage series leaching tank, and the leaching temperature is maintained at 80°C;

[0041] C, adding industrial sulfuric acid to the first stage of cascaded leaching tanks according to the ratio of acid to material 0.3:1;

[0042] D. Press SO 2 Sulfur dioxide is measured at a material ratio of 0.4, and is evenly distributed to each leaching tank according to 7 tanks;

[0043] E. Control the total residence time of slurry and sulfuric acid from the first stage to the fifth stage outlet to 180 minutes.

[0044] Through the control of the above conditions, the comprehensive leaching rate of nickel and cobalt in low-grade laterite nickel ore is 91.8%. Through partial return adjustment, the nickel conten...

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Abstract

The invention provides a method for leaching nickel and cobalt from low-grade laterite-nickel ore, comprising the steps that: smash, grinding and size mixing the ore, controlling the ore granule -100 mesh; adding ore pulp into a reaction kettle for atmospheric pressure acid leaching; strengthening by a reducer during the leaching process. The leaching condition is: the ratio of acid to material is 0.2:1-0.5:1; the ratio of solid to liquid is 3:1-5:1; the temperature is 60 to 95 DEG C; electroequivalent of the reducer according to Fe in the ore is 0.5-1.0; the leaching time is 60 to 240 minutes; and the lixivium is partially cycled during the leaching process to control the nickel concentration greater than 2g / L. In the method for processing low-grade laterite-nickel ore, the leaching rate of nickel is greater than 90%, the leaching rate of cobalt is greater than 85%, and the leaching rate of ferrum is lower than 30%.

Description

technical field [0001] The invention relates to a method for extracting nickel from nickel ore, in particular to a method for acid leaching nickel and cobalt from low-grade laterite nickel ore. Background technique [0002] Nickel is a metal with abundant reserves on the earth. The world's terrestrial nickel reserves are about 470 million tons, of which 60% belong to lateritic nickel deposits, and 40% belong to magmatic copper-nickel sulfide deposits. At present, the nickel produced by the world's nickel industry mainly comes from nickel sulfide ore resources, accounting for about 60% to 65% of the total output, and the rest comes from nickel oxide ore. However, with the depletion of nickel sulfide ore on the earth, the proportion of nickel produced from nickel oxide ore is increasing rapidly. It is estimated that by 2010 the production of nickel from nickel oxide ore will exceed the production of nickel from nickel sulphide ore. The nickel content of nickel laterite ore i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/06C22B23/00
CPCY02P10/20
Inventor 胡启阳李新海王志兴郭华军符芳铭
Owner CENT SOUTH UNIV
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