Unlock instant, AI-driven research and patent intelligence for your innovation.

A method of controlling potential oxidation to remove mn from cobalt sulfate solution 2+ Methods

A technology of cobalt sulfate solution and solution, which is applied in the field of hydrometallurgy, can solve the problems of high operating cost, large P204 load, and difficult to control, and achieves the effects of reducing extraction cost, production cost, and easy operation and control.

Active Publication Date: 2020-04-14
KUNMING METALLURGY INST
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The crude cobalt sulfate solution obtained by sulfuric acid leaching from cobalt slag often has a relatively high content of metal impurities. If the cobalt sulfate solution is not pre-treated for impurity removal, it will directly enter P204 for extraction and removal of impurities, which will cause too much load on P204 and high operating costs. , and will affect the extraction capacity of P204, especially Mn 2+ The cobalt sulfate solution with higher content directly enters the P204 extraction system, which has a significant impact on the extraction capacity of P204, resulting in excessive metal impurities in the purified cobalt sulfate solution, and the produced product is unqualified. Therefore, before entering the P204 extraction system , for Mn in crude cobalt sulfate solution 2+ It is necessary to carry out preliminary removal
[0004] Mn in the sulfuric acid system is most commonly used in industry 2+ The removal method is to use potassium permanganate, H 2 o 2 Oxidation and removal of Mn by other oxidants 2+ , the oxidation of potassium permanganate is too strong, it is not easy to control in the oxidation reaction process, in the oxidation of Mn 2+ Co 2+ It is also oxidized in large quantities, the cobalt loss is too high, and the MnO in the slag is removed by oxidation 2 and Co(OH) 3 are too high to be sold or recycled
Add H 2 o 2 Oxidative demanganization consumes too much, the cost is too high, and the cobalt sulfate solution will be diluted at the same time, which is not conducive to the subsequent production process

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method of controlling potential oxidation to remove mn from cobalt sulfate solution <sup>2+</sup> Methods
  • A method of controlling potential oxidation to remove mn from cobalt sulfate solution <sup>2+</sup> Methods

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Such as figure 1 and 2 As shown, using Na 2 S 2 o 8 (2.08V), Mn 2+ (1.3V), Co 2+ (1.8 V) difference in the highest redox potential in aqueous solution, controlling CoSO 4 Solution potential and pH value, with Na 2 S 2 o 8 Oxidative Removal of Mn from Cobalt Sulfate Solution 2+ , the solution after demanganization of cobalt sulfate is extracted with P204 to extract and separate trace metal impurities in the solution, and then extract and separate Ni and Co through P507 to obtain pure cobalt sulfate solution for the production of CoSO 4 ·7H 2 O product or electric cobalt; the main component of the oxide precipitation residue is MnO 2 and Co(OH) 3 , can be used as an oxidant in the oxidation and iron removal process in the electro-nickel hydrometallurgy system for recycling, or sold as manganese slag. The specific steps include:

[0029] (1) will contain Co 2+ : 55g / L, Mn 2+ : Add 0.4g / L crude cobalt sulfate solution into the beaker, and add sodium hydroxide...

Embodiment 2

[0033] Utilize Na 2 S 2 o 8 (2.08V), Mn 2+ (1.3V), Co 2+ (1.8 V) difference in the highest redox potential in aqueous solution, controlling CoSO 4 Solution potential and pH value, with Na 2 S 2 o 8 Oxidative Removal of Mn from Cobalt Sulfate Solution 2+ , the solution after cobalt sulfate demanganization is extracted with P204 to extract and separate trace metal impurities in the solution, and then through P507 extraction to separate Ni and Co to obtain pure cobalt sulfate solution for the production of CoSO 4 ·7H 2 O product or electric cobalt; the main component of the oxide precipitation residue is MnO 2 and Co(OH) 3 , can be used as an oxidant in the oxidation and iron removal process in the electro-nickel hydrometallurgy system for recycling, or sold as manganese slag. The specific steps include:

[0034] (1) will contain Co 2+ : 57g / L, Mn 2+ : Add 2.2g / L crude cobalt sulfate solution into the beaker, and add sodium hydroxide solution to adjust the pH value o...

Embodiment 3

[0038] Utilize Na 2 S 2 o 8 (2.08V), Mn 2+ (1.3V), Co 2+ (1.8 V) difference in the highest redox potential in aqueous solution, controlling CoSO 4 Solution potential and pH value, with Na 2 S 2 o 8 Oxidative Removal of Mn from Cobalt Sulfate Solution 2+ , the solution after cobalt sulfate demanganization is extracted with P204 to extract and separate trace metal impurities in the solution, and then through P507 extraction to separate Ni and Co to obtain pure cobalt sulfate solution for the production of CoSO 4 ·7H 2 O product or electric cobalt; the main component of the oxide precipitation residue is MnO 2 and Co(OH) 3 , can be used as an oxidant in the oxidation and iron removal process in the electro-nickel hydrometallurgy system for recycling, or sold as manganese slag. The specific steps include:

[0039] (1) will contain Co 2+ : 60g / L, Mn 2+ : 5.0g / L crude cobalt sulfate solution is added to the beaker, and sodium hydroxide solution is added to adjust the pH...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method for removing Mn<2+> in a cobaltous sulfate solution by controlling potential oxidation, and belongs to the technical field of wet metallurgy. The method comprises thefollowing steps: selecting Na2S2O8 as an oxidant, continuously stirring a crude CoSO4 solution, and maintaining the pH of the solution to be 5.0 to 5.5, the temperature to be 55 to 60 DEG C and the oxidation potential to be 0.4 to 1.3 V all the time, subsectionally adding an Na2S2O8 solution at a constant speed, controlling the addition amount of the Na2S2O8 oxidant to be 3.5 to 4 times of the theory mole content of Mn<2+> inside the crude CoSO4 solution, reacting for 0.8 to 1.2 h, and filtering to obtain oxidized manganese removal slag containing MnO2 and Co(OH)3, wherein the liquid phase isa CoSO4 solution after Mn<2+> is removed. The main ingredients of the oxidized manganese removal slag are MnO2 and Co(OH)3, and can be recycled as oxidants in an oxidation iron removal working procedure in a nickel plating wet smelting system, or can be sold as a manganese slag. According to the method, after initial removal of Mn<2+> inside the cobaltous sulfate solution, the load and the operation cost of P204 extraction are reduced, and the effect of no waste residue and waste liquid emission is reached, so that the method is green, environmentally-friendly and zero-emission.

Description

technical field [0001] The invention relates to a method for controlling potential oxidation to remove Mn in cobalt sulfate solution 2+ The method belongs to the technical field of hydrometallurgy. Background technique [0002] CoSO 4 ·7H 2 O products are widely used in industry, and are used as paint drier in the coating industry. The ceramic industry is used as a colored porcelain glaze. The chemical industry is used to manufacture cobalt-containing pigments and as a raw material for the production of various cobalt salts. In the battery industry, it is used as an additive for alkaline batteries and lithopone. In addition, it can also be used for electroplating cobalt, making batteries, cobalt pigments, ceramics, enamel, glazes, catalysts, foam stabilizers, drier, etc. [0003] Due to the lack of cobalt mines at home and abroad, there are very few cobalt resources that can be developed and utilized. Most of the cobalt metal is associated with other metal minerals. It...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/44C22B23/00C22B47/00
CPCC22B3/44C22B23/0461C22B47/00Y02P10/20
Inventor 彭学斌田林林琳李小英翟忠标杨勇杨妮谢刚
Owner KUNMING METALLURGY INST