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Method for removing iron by oxidation and neutralization in cobalt wet smelting process

A hydrometallurgy and process technology, applied in the field of oxidation and iron removal, can solve the problems of high investment or production costs, low economic benefits, etc., and achieve the effects of high iron removal efficiency, convenient comprehensive recovery, and high iron content

Active Publication Date: 2012-07-25
ZHEJIANG HUAYOU COBALT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Cobalt in copper-cobalt concentrate exists in the form of cobalt oxide and copper in the form of copper oxide in the raw materials. In the traditional cobalt hydrometallurgy process, sulfuric acid is used to leach most of the copper in the concentrate, and the leaching solution enters the copper extraction process. Cobalt can be leached from the concentrate by adding a reducing agent to the leached slag. The obtained acid-dissolved leaching solution of copper-cobalt ore is generally purified and removed by a combination of traditional chemical precipitation purification and solvent extraction. The process is as follows: The solution of cobalt and impurities Ni, Fe, Ca, Mg, Cu, Mn, Zn, etc. is first oxidized and neutralized to remove iron, the reagent precipitates to remove calcium and magnesium, and then undergoes solvent extraction to remove impurities and separate cobalt and nickel. In the above oxidation In the traditional method of removing iron, a large amount of oxidizing agent such as hydrogen peroxide, sodium chlorate or oxygen needs to be added, which makes the investment or production cost of the oxidation neutralization and iron removal process high and the economic benefit is low

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  • Method for removing iron by oxidation and neutralization in cobalt wet smelting process

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Embodiment 1

[0016] 1) One-stage acid leaching process: take 300g of copper-cobalt concentrate mineral material and place it in a container, its main chemical components are: Co% 4.44, Cu% 13.39, Fe% 3.18, Mn% 0.32, and then slowly add 51ml of industrial sulfuric acid, And control the solid-liquid ratio to be 1:10, react at a temperature of 50°C and Ph 1.5-1.0 for 3 hours, and obtain 167.2g of one-stage leaching residue after filtration, the main content of which is: Co% 8.76, Cu% 1.32, Fe %6.78, the obtained one-stage leaching solution enters the copper extraction process.

[0017] 2) Two-stage reducing acid leaching process: Take 100g of one-stage leaching residue, control the solid-liquid ratio to 1:4, add 10ml of industrial sulfuric acid and 13.14g of reducing agent sodium metabisulfite, and react at a temperature of 80°C and Ph 0.5-1.0 for 2.5 Hours, the 400ml secondary leachate obtained after filtration contains total Fe5.3g / l, Fe 2+ 5.12g / l; 81.92g of second-stage leaching residue,...

Embodiment 2

[0021] 1) One-stage acid leaching process: take 300g of copper-cobalt concentrate mineral material and place it in a container, its main chemical components are: Co% 4.44, Cu% 13.39, Fe% 3.18, Mn% 0.32, and then slowly add 51ml of industrial sulfuric acid, And control the solid-liquid ratio to be 1:10, react at a temperature of 50°C and Ph 1.5-1.0 for 3 hours, and obtain 167.2g of one-stage leaching residue after filtration, the main content of which is: Co% 8.76, Cu% 1.32, Fe %6.78, the obtained one-stage leaching solution enters the copper extraction process. This process was repeated once more, and one stage of leaching residue was accumulated to 334.4g.

[0022] 2) Two-stage reducing acid leaching process: Take 100g of one-stage leaching residue, control the solid-liquid ratio to 1:4, add 10ml of industrial sulfuric acid and 13.14g of reducing agent sodium metabisulfite, and react at a temperature of 80°C and Ph 0.5-1.0 for 2.5 Hours, the 400ml secondary leachate obtained...

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Abstract

The invention discloses a method for removing iron by oxidation and neutralization in a cobalt wet smelting process. In the conventional method for removing the iron by the oxidation and the neutralization, a large number of oxidant is required, so the investment or production cost is high and the economical benefits are undesirable in the process of removing the iron by the oxidation and the neutralization. The method of removing the iron by the oxidation and the neutralization in the cobalt wet smelting process adopts a technical scheme, which comprises: 1) a first-stage acid leaching process, wherein the obtained one-stage leachate enters a copper extracting process and first-stage leached residues are kept for later use; 2) a second-stage reduction and acid leaching process, wherein an acid and a reducing agent are added into one part of the first-stage leached residues to perform reaction, the obtained two-stage leached residues are discarded as wastes after washing and the second-stage leachate is kept for later use; (3) an oxidation process, wherein the residual leached residues are mixed with the two-stage leachate; and 4) a process of removing the iron by the neutralization, wherein Fe3+-contained solution obtained in the oxidation process and an alkali liquid are added into a reactor in a form of co-current flow to perform the reaction. The method makes a full use ofCo3+ of copper-cobalt concentrates to completely oxidize Fe2+, so a great amount of raw material cost is saved and the iron removal efficiency is improved.

Description

technical field [0001] The invention relates to a method for removing iron, in particular to an oxidation neutralization method for removing iron in cobalt hydrometallurgy. Background technique [0002] Cobalt in copper-cobalt concentrate exists in the form of cobalt oxide and copper in the form of copper oxide in the raw materials. In the traditional cobalt hydrometallurgy process, sulfuric acid is used to leach most of the copper in the concentrate, and the leaching solution enters the copper extraction process. Cobalt can be leached from the concentrate by adding a reducing agent to the leached slag. The obtained acid-dissolved leaching solution of copper-cobalt ore is generally purified and removed by a combination of traditional chemical precipitation purification and solvent extraction. The process is as follows: The solution of cobalt and impurities Ni, Fe, Ca, Mg, Cu, Mn, Zn, etc. is first oxidized and neutralized to remove iron, the reagent precipitates to remove ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/06C22B23/00
CPCY02P10/20
Inventor 蒋航宇刘琨
Owner ZHEJIANG HUAYOU COBALT