Method for recovering cobalt from inverse antimony purified cobalt residue

A technology for cobalt slag and cobalt precipitation, which is applied in the field of hydrometallurgy, can solve the problems of impurities brought by oxidants, reduce the grade of cobalt concentrate, and incomplete removal of iron and manganese, and achieve the effect of improving the grade.

Active Publication Date: 2015-06-24
YUNNAN CHIHONG ZINC & GERMANIUM
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] The invention aims to solve the technical problems of incomplete removal of iron and manganese in the known reverse antimony purification cobalt slag treatment technology, impurity brought in by the oxidant, and reduction of the grade of cobalt concentrate

Method used

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Examples

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Effect test

Embodiment 1

[0032] (1) Leaching: reverse antimony purified cobalt slag (containing 0.2wt% cobalt, 20wt% zinc, 15wt% lead, 7wt% cadmium, 5wt% copper, 1wt% iron, 300g / t silver, 600g / t germanium) dry weight 1t , together with 2t of produced water, put into the mechanical stirring tank, stir, heat up to 88°C, add 40wt% sulfuric acid solution evenly and slowly to the mixed material liquid, stop adding sulfuric acid solution when the pH value of the mixed material liquid drops to 2.5, when When the pH value rises to 4.0, add sulfuric acid solution slowly and evenly again, and circulate like this until the pH value no longer rises, add a small amount of cobalt slag to raise the pH value to 4.0, filter the mixed material liquid to obtain leaching liquid and leaching residue respectively; the obtained leaching residue Containing 31.25wt% lead, 9.6wt% copper, 0.11wt% germanium, and 625g / t silver, the leach slag is sent to crude lead smelting to recover lead, silver, and copper, and then sent to fumi...

Embodiment 2

[0036] (1) Leaching: Antimony-purified cobalt slag (containing 1wt% cobalt, 15wt% zinc, 10wt% lead, 5wt% cadmium, and 1.5wt% iron) with a dry weight of 1t is added to the mechanical stirring tank together with 2.5t of production water , stir, heat up to 90°C, add 35% sulfuric acid solution evenly and slowly to the mixture liquid, stop adding sulfuric acid solution when the pH value of the mixture liquid drops to 2.5, and slowly and uniformly add sulfuric acid solution again when the pH value rises to 4.0 , circulate like this until the pH value no longer rises, add a small amount of cobalt slag to raise the pH value to 4.0, filter the mixed material liquid to obtain the leaching liquid and leaching residue respectively; the obtained leaching residue contains 22.2wt% of lead and 6.7wt% of zinc. The slag is sent to crude lead smelting to recover lead, and then to fuming furnace to recover zinc; the resulting leachate contains 4.45g / l cobalt, 55g / l zinc, 22g / l cadmium, and 2.0g / l ...

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Abstract

The invention relates to a method for recovering cobalt from inverse antimony purified cobalt residue. The inverse antimony purified cobalt residue of zinc hydrometallurgy is taken as a raw material, and the cobalt concentrate is prepared by use of the processes of leaching, iron removal and cobalt settlement. The reducing atmosphere of leaching the cobalt residue in sulfuric acid is controlled so that metals such as copper and germanium cannot be leached and only zinc, cadmium, cobalt and little iron can be leached; in this way, a relatively high pH value can be controlled during iron removal, the purpose of thorough iron removal can be achieved and the iron can be prevented from being oxidized and hydrolyzed into the cobalt concentrate during cobalt settlement; air serves as an iron removal oxidizing agent, while hydrogen peroxide serves as a cobalt settlement oxidizing agent, and no impurity is imported; and the method is advantageous for increasing the grade of the cobalt concentrate.

Description

technical field [0001] The invention relates to a method for recovering cobalt from antimony-purified cobalt slag and belongs to the technical field of hydrometallurgy. Background technique [0002] The known antimony antimony purification cobalt slag treatment methods are mainly divided into the following categories: 1) Simple weak pickling method: After the cobalt slag is leached with low-temperature weak acid, the solution is returned to the main electro-zinc system, and the slag remains in the heap to recover cobalt. Because the temperature, acidity, reaction time and other conditions required by this process are relatively harsh, it is difficult to guarantee it by manual operation, so the implementation in large-scale organization production is not strict. 2) Leaching-extraction method: In this method, the antimony-purified cobalt slag is first leached with sulfuric acid to extract cobalt, zinc, and cadmium, and P204 is used to extract impurities such as iron, zinc, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B23/00
CPCY02P10/20
Inventor 张候文罗永光孙成余贾著红吴红林邹利明廖为新罗凌燕
Owner YUNNAN CHIHONG ZINC & GERMANIUM
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