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Leaching method of refractory cobalt ore

A cobalt ore and leaching technology, applied in the field of leaching of refractory cobalt ore, can solve problems such as difficult impurity removal process, spillover environment, environmental pollution, etc., and achieve the effects of improving economic benefits and production, reducing environmental pollution, and reducing production costs

Active Publication Date: 2019-08-30
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When ferrous ions are used as the reducing agent, the reduction effect is better, but a large amount of iron ions enter the solution during the leaching process, which leads to difficulties in the subsequent impurity removal process, which is currently less used; in the process of using sulfur dioxide as the reducing agent, the gas utilization rate is not good. High and will overflow in the reactor and cause environmental pollution; when sodium sulfite is used as the reducing agent, the utilization rate of the reducing agent is not high and sulfur dioxide gas will be generated during the reduction process, and these gases will still overflow into the air to cause environmental pollution; use When sulfur dioxide or sodium sulfite is used as the reducing agent, the reaction temperature is generally controlled at 80-90°C, and the reaction time is relatively long, usually 5-6 hours, to achieve a higher leaching rate

Method used

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  • Leaching method of refractory cobalt ore

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The refractory cobalt ore used is high manganese cobalt oxide ore that is ground to a particle size of -200 mesh;

[0026] Process such as figure 1 shown;

[0027] Crush the biomass reducing agent to particle size -60 mesh, then add sulfuric acid solution for hydrolysis, the hydrolysis temperature is 40°C, and the hydrolysis time is 40 minutes to make hydrolyzed material; the biomass reducing agent is poplar, and the mass concentration of the sulfuric acid solution is 70%. The mass ratio of sulfuric acid solution and biomass reducing agent is 1;

[0028] Dissolve the hydrolyzed material in water, then put it into the refractory cobalt ore for leaching, the leaching temperature is 60°C, and the leaching time is 5h to obtain the leached material; the liquid-solid ratio of water to the hydrolyzed material is 3L / kg, and the hydrolyzed material and refractory cobalt The mass ratio of ore is 0.5;

[0029] Separating the leached material from solid to liquid to obtain a cob...

Embodiment 2

[0032] Method is with embodiment 1, and difference is:

[0033] (1) The hydrolysis temperature is 50° C., and the hydrolysis time is 20 minutes; the mass concentration of the sulfuric acid solution is 75%, and the mass ratio of the sulfuric acid solution and the biomass reducing agent is 1.5;

[0034] (2) The leaching temperature is 70°C, and the leaching time is 3 hours to obtain the leached material; wherein the liquid-solid ratio of water to the hydrolyzed material is 4L / kg, and the mass ratio of the hydrolyzed material to the refractory cobalt ore is 0.4;

[0035] (3) The concentration of Co in the cobalt-containing leaching solution is 8.59g / L, the leaching rate of cobalt is 99%, and the leaching rate of manganese is 98%.

Embodiment 3

[0037] Method is with embodiment 1, and difference is:

[0038] (1) The hydrolysis temperature is 45° C., and the hydrolysis time is 30 minutes; the mass concentration of the sulfuric acid solution is 80%, and the mass ratio of the sulfuric acid solution and the biomass reducing agent is 2;

[0039] (2) The leaching temperature is 80°C and the leaching time is 2h to obtain the leached material; wherein the liquid-solid ratio of water to the hydrolyzed material is 6L / kg, and the mass ratio of the hydrolyzed material to the refractory cobalt ore is 0.2;

[0040] (3) The concentration of Co in the cobalt-containing leaching solution is 6.45g / L, the leaching rate of cobalt is 99%, and the manganese leaching rate of manganese is 99%.

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Abstract

The invention discloses a leaching method of refractory cobalt ore. The leaching method of the refractory cobalt ore comprises the following steps that (1), after a biomass reducing agent is crushed,a sulfuric acid solution is added for hydrolysis, wherein the biomass reducing agent is poplar or straw; (2) a hydrolyzed material is dissolved in water, and then the refractory cobalt ore is placed in for leaching; and (3) the leached material is subjected to solid-liquid separation to obtain a cobalt-containing leachate. In the method, the leaching reducing agent is wide in raw material source,environmentally friendly, low in leaching temperature and short in leaching time. No harmful gas is produced in the leaching process, environmental pollution of enterprises is reduced, the productioncost is reduced, and economic benefits and the yield are improved.

Description

technical field [0001] The invention belongs to the technical field of cobalt metallurgy, in particular to a method for leaching refractory cobalt ore. Background technique [0002] In cobalt ore, cobalt generally exists in the form of high-valence oxides or other high-valence states. In the wet leaching process, a reducing agent must be added to reduce high-valence cobalt into divalent cobalt ions dissolved in liquid; the commonly used reduction Agents are ferrous ions, sulfur dioxide gas and sodium sulfite. [0003] When ferrous ions are used as the reducing agent, the reduction effect is better, but a large amount of iron ions enter the solution during the leaching process, which leads to difficulties in the subsequent impurity removal process, which is currently less used; in the process of using sulfur dioxide as the reducing agent, the gas utilization rate is not good. High and will overflow in the reactor and cause environmental pollution; when sodium sulfite is used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/08C22B23/00C22B15/00C22B47/00
CPCC22B3/08C22B15/0071C22B23/043C22B47/00
Inventor 金哲男于勇健杨洪英王百润
Owner NORTHEASTERN UNIV
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