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Method for preparing manganese sulfate by utilizing manganese oxide

A technology of manganese oxide ore and manganese sulfate is applied in the field of preparing manganese sulfate for electrolysis of manganese dioxide, which can solve the problems of high impurity removal cost, low rate of manganese sulfate, and poor impurity removal effect, and achieve accelerated filtration of slag and ionic impurities Precipitation, strong adsorption, effect of reducing dosage

Inactive Publication Date: 2014-01-29
GUANGXI GUILIU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems of low manganese sulfate rate, poor impurity removal effect and high impurity removal cost in the preparation method of the existing electrolytic manganese dioxide electrolyte—manganese sulfate solution. SO 2 Catalysis, introducing Ca(MnO 4 ) 2 , NaMnO 4 MnO in 4 － As an adsorbent, a method for preparing manganese sulfate by using manganese oxide ore is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] a. Manganese sulfate leaching: put manganese oxide ore powder, pyrite powder, and industrial sulfuric acid with a particle size of ≥150 mesh into the leaching reaction tank at a weight ratio of 10000g: 1300g: 1900g. The stirring speed is 70rpm and the temperature is 95 The reaction was carried out under the condition of ℃ for 5 hours, and the crude manganese sulfate slurry was obtained by leaching. The content of Mn in the manganese oxide ore powder used in the present embodiment is 22%; The content of S in the described pyrite powder is 40%; In the described industrial sulfuric acid, H 2 SO 4 ≥97%.

[0021] b. Neutralization and iron removal: under normal temperature conditions, add ammonium bicarbonate to the crude manganese sulfate slurry obtained in step a to neutralize the residual H in the solution 2 SO 4 , so that the pH of the solution is 4.5, stop adding ammonium bicarbonate, and detect that the concentration of ferrous ions in the solution is ≤10 -5 mol / L ...

Embodiment 2

[0024] a. Manganese sulfate leaching: Put manganese oxide ore powder, pyrite powder, and industrial sulfuric acid with a particle size of ≥150 mesh into the leaching reaction tank at a weight ratio of 10000g: 1500g: 2200g. The reaction was carried out under the condition of ℃ for 4 hours, and the crude manganese sulfate slurry was obtained by leaching. The content of Mn in the manganese oxide ore powder is 15%; the content of S in the described pyrite powder is 25%; in the described industrial sulfuric acid, H 2 SO 4 ≥97%.

[0025] b. Neutralization and iron removal: the same operation steps as in Example 1.

[0026] c. Heavy metal removal: heat the crude manganese sulfate solution obtained in step b to 85°C, slowly add barium sulfide BaS and sodium sulfide Na 2 Sulfide mixture of S, 20% sodium sulfide Na 2 S solution and 20% barium sulfide BaS solution are mixed according to the volume ratio of 0.2L:0.8L, the speed of adding the vulcanization mixture is 2g / L / min, and the ...

Embodiment 3

[0028] a. Manganese sulfate leaching: Put manganese oxide ore powder, pyrite powder, and industrial sulfuric acid with a particle size of ≥150 mesh into the leaching reaction tank at a weight ratio of 10000g: 1200g: 1800g. The stirring speed is 60rpm and the temperature is 95 Under the condition of ℃, react for 4~5 hours, leaching to obtain crude manganese sulfate solution slurry. The content of Mn in the manganese oxide ore powder is 15%; the content of S in the described pyrite powder is 25%; in the described industrial sulfuric acid, H 2 SO 4 ≥97%.

[0029] b. Neutralization and iron removal: the operation steps are the same as in Example 1.

[0030] c. Heavy metal impurity removal: heat the crude manganese sulfate solution obtained in step b to 88°C, slowly add barium sulfide BaS and sodium sulfide Na 2 Sulfur mixture of S, 25% sodium sulphide Na 2 S solution and 30% barium sulfide BaS solution are mixed according to the volume ratio of 0.15L:0.85L, the speed of adding...

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Abstract

The invention belongs to the field of processing battery materials, and particularly relates to a method for preparing manganese sulfate by utilizing manganese oxide. The preparation method comprises the steps of manganese sulfate steeping, neutralization and iron removal, and deep removal of heavy metals. As an adsorbent, MnO4<-1> in Ca(MnO4)2 and NaMnO4 in the deep removal process of heavy metals has strong adsorption effect on As, Sb and Mo ions, has strong adsorption capability on Cu, Co, Ni, Pb, Fe and other ions in the solution, deep impurity removal of the manganese sulfate solution can be realized under the secondary adsorption action of the adsorbent after the Fe, Cu, Co, Ni and Pb are removed, so that the concentrations of trace elements As, Sb and Mo are all less than or equal to 0.003ppm to obtain high-quality manganese sulfate solution, the filtering and impurity removal of the solution and precipitation of ion impurities can be accelerated by utilizing a filtering aid and a macromolecular polyelectrolyte flocculant, the preparation technology can be simplified, and the preparation process efficiency can be improved.

Description

technical field [0001] The invention belongs to the field of battery material processing, in particular to a method for preparing manganese sulfate for manganese dioxide electrolysis by utilizing low-grade manganese oxide ore under high temperature conditions. Background technique [0002] In the traditional manganese sulfate leaching preparation and its impurity removal process, since the newly formed manganese dioxide has a large specific surface area, and due to the electronegativity, it is harmful to metal ions, especially those with large atomic radius and electrons. Ions with many layers and unsaturated inner electron layers that are easy to deform have great adsorption capacity and are used in chemical analysis, preparation of analytical samples and purification of heavy metal ions of chemicals. The adsorption of positive ions by manganese dioxide is considered to be an exchange effect, that is, hydrogen ions are transferred from the diffusion layer of colloidal p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B47/00C22B3/08C22B3/24C22B3/44C22B3/46
Inventor 罗驰飞覃秀华邱立铭吴伟金范汝平韦安
Owner GUANGXI GUILIU CHEM CO LTD
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