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Method for preparing electrolytic manganese dioxide by using pyrolusite

A technology of electrolytic manganese dioxide and pyrolusite, applied in the direction of electrolysis process, electrolysis components, process efficiency improvement, etc., can solve the problem of high energy consumption in electrolysis, achieve the effect of promoting solution, realizing regeneration and recycling, and reducing DC power consumption

Inactive Publication Date: 2019-10-22
贵州合众锰业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a method for utilizing pyrolusite to prepare electrolytic manganese dioxide, which can effectively solve the problem of producing dithionate in the pyrolusite sulfur dioxide leaching method, which leads to high energy consumption of electrolysis and The problem of producing a large amount of iron-containing waste residue in the leaching method of ferrous manganese ore ferrous sulfate

Method used

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Examples

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Effect test

Embodiment 1

[0035] A method for preparing electrolytic manganese dioxide using pyrolusite includes the following steps:

[0036] (1) Manganese ore leaching: pulverize pyrolusite with a manganese content of 22% to obtain pyrolusite particles with a particle size of 40 mesh. Mix 280 kg of pyrolusite particles with 2000L of a mixed solution containing manganese sulfate and ferrous sulfate to obtain a slurry. Under stirring conditions, leaching for 1 hour; wherein the mass concentration of manganese in the mixed solution is 35g / L, and the mass concentration of ferrous sulfate is 0.8mol / L;

[0037] (2) Neutralizing iron precipitation: Under stirring conditions, add calcium hydroxide to the resultant of step (1), adjust the pH to 5, and pass in oxygen to make Fe in the solution 2+ The concentration is 0.2mg / L, and then filtered to obtain manganese sulfate solution and iron hydroxide filter residue;

[0038] (3) Remove heavy metals: Add ammonium sulfide to the manganese sulfate solution obtained in ste...

Embodiment 2

[0042] A method for preparing electrolytic manganese dioxide using pyrolusite includes the following steps:

[0043] (1) Manganese ore leaching: pulverize pyrolusite with a manganese content of 20% to obtain pyrolusite particles with a particle size of 200 mesh. Mix 525 kg of pyrolusite particles and 3500L of a mixed solution containing manganese sulfate and ferrous sulfate to obtain a slurry. Under stirring conditions, leaching for 5 hours; wherein the mass concentration of manganese in the mixed solution is 45g / L, and the mass concentration of ferrous sulfate is 1.6mol / L;

[0044] (2) Neutralizing iron precipitation: Under stirring conditions, add calcium hydroxide to the resultant of step (1), adjust the pH to 7, and pass in oxygen to make Fe in the solution 2+ The concentration is 0.9mg / L, and then filtered to obtain manganese sulfate solution and iron hydroxide filter residue;

[0045] (3) Removal of heavy metals: Add manganese sulfide to the manganese sulfate solution obtained ...

Embodiment 3

[0049] A method for preparing electrolytic manganese dioxide using pyrolusite includes the following steps:

[0050] (1) Manganese ore leaching: pulverize pyrolusite with a manganese content of 25% to obtain pyrolusite particles with a particle size of 60 mesh, and mix 731 kg of pyrolusite particles with 6000L of mixed solution containing manganese sulfate and ferrous sulfate to obtain a slurry. Under stirring conditions, leaching for 3 hours; wherein the mass concentration of manganese in the mixed solution is 43g / L, and the mass concentration of ferrous sulfate is 1.3mol / L;

[0051] (2) Neutralization of iron precipitation: Under stirring conditions, add calcium hydroxide to the resultant of step (1), adjust the pH to 6, and pass in oxygen to make Fe in the solution 2+ The concentration is 0.5mg / L, and then filtered to obtain manganese sulfate solution and iron hydroxide filter residue;

[0052] (3) Remove heavy metals: Add ammonium sulfide to the manganese sulfate solution obtaine...

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Abstract

The invention discloses a method for preparing electrolytic manganese dioxide by using pyrolusite. The method comprises the steps of manganese ore leaching: preparing slurry from a mixed solution containing manganese sulfate and ferrous sulfate and pyrolusite particles, and carrying out leaching; cast iron neutralizing: adding a calcium-based neutralizing agent into the obtained slurry, adjustingthe pH value, adding an oxidizing agent, enabling the Fe2+ concentration in the slurry to be lower than 1 mg / L, and filtering the slurry to obtain a manganese sulfate solution and ferric hydroxide filter residue; heavy metal removal: adding a vulcanizing agent into the obtained manganese sulfate solution to enable the concentration of heavy metal ions in the solution to be lower than 1 mg / L, and then filtering the solution to obtain vulcanizing slag and a new electrolytic solution; and electrolytic recovery of metal manganese: electrolyzing the obtained new electrolytic solution to obtain electrolytic manganese dioxide and an anode solution containing sulfuric acid. With the method, the problems that dithionite is generated in the pyrolusite sulfur dioxide leaching method and consequentlythe electrolysis energy consumption is high, and a large quantity of iron-containing waste residues are generated in the pyrolusite ferrous sulfate leaching method can be effectively solved.

Description

Technical field [0001] The invention relates to the technical field of preparation of electrolytic manganese dioxide, and specifically relates to a method for preparing electrolytic manganese dioxide using pyrolusite. Background technique [0002] Electrolytic manganese dioxide is an excellent battery depolarizer. Compared with dry batteries produced by natural discharge manganese dioxide, it has the characteristics of large discharge capacity, strong activity, small size and long life. At present, electrolytic manganese and manganese dioxide are mainly obtained by electrolytic manganese sulfate solution. Using manganese ore as a raw material, leaching, purification and electrolysis are common steps for producing electrolytic manganese dioxide. [0003] Manganese Carbonate (MnCO 3 ) And pyrolusite (MnO 2 ) Are the two main types of manganese ore in nature. However, the long-term use of manganese carbonate-sulfuric acid leaching electrolyte production technology in our country has ...

Claims

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Application Information

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IPC IPC(8): C22B47/00C22B3/44C22B3/08C25B1/21
CPCC22B3/08C22B3/44C22B47/0063C22B47/0081C25B1/21Y02P10/20
Inventor 刘星朱学成高利宇善臣
Owner 贵州合众锰业科技有限公司