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Production process for high purity manganese sulfate through reduction with pyrolusite powder as raw material

A production method and technology of manganese sulfate, applied in manganese sulfate and other directions, can solve the problems of consumption of impurity removal agent, disadvantage, and reduce production cost, and achieve high controllability and reproducibility of quality, convenient operation, and guaranteed quality. Effect

Active Publication Date: 2013-04-03
DAXIN MANGANESE MINE BRANCH OF CITIC DAMENG MINING IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods need to strictly control the reaction temperature and pH value, and consume a large amount of high-purity impurity removal agents, which is not conducive to reducing production costs

Method used

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  • Production process for high purity manganese sulfate through reduction with pyrolusite powder as raw material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] a. Removal of impurities such as calcium, magnesium, potassium and sodium: leaching pyrolusite with concentrated sulfuric acid and deionized water. The weight concentration of concentrated sulfuric acid is 98%, and the weight ratio of concentrated sulfuric acid, deionized water and soft iron ore is 1:1:2. Soak for 2 hours under stirring, filter, and wash the filter residue twice with hot deionized water at 40°C that is 4 times the weight of the filter residue;

[0020] b. Reduction leaching: add deionized water to make the filter residue washed twice in step a into a slurry, the weight of deionized water added is 1 times the weight of the filter residue, add 98% sulfuric acid and 20% hydrogen peroxide and stir for leaching for 1 hour, Filter to obtain manganese sulfate solution;

[0021] c. Primary crystallization: use the manganese sulfate solution that steam jacket heating step b obtains, evaporate water, concentrate the manganese sulfate solution to 600g / L, let sta...

Embodiment 2

[0024] a. Removal of impurities such as calcium, magnesium, potassium and sodium: leaching pyrolusite with concentrated sulfuric acid and deionized water. The weight concentration of concentrated sulfuric acid is 95%, and the weight ratio of concentrated sulfuric acid, deionized water and soft iron ore is 1:1:2. Soak for 2.5 hours under stirring, filter, and wash the filter residue twice with hot deionized water at 45°C that is 4 times the weight of the filter residue;

[0025] b. Reduction leaching: add deionized water to adjust the filter residue after twice washing in step a into a slurry, the weight of deionized water added is 1 times the weight of the filter residue, add concentrated sulfuric acid with a weight concentration of 90% and a weight concentration of 30% Hydrogen peroxide was stirred and leached for 2 hours, and the weight ratio added was sulfuric acid: hydrogen peroxide: filter residue = 0.7:1:1, filtered to obtain manganese sulfate solution;

[0026] C. Pri...

Embodiment 3

[0029] a. Removal of impurities such as calcium, magnesium, potassium and sodium: leaching pyrolusite with concentrated sulfuric acid and deionized water. The weight concentration of concentrated sulfuric acid is 95%, and the weight ratio of concentrated sulfuric acid, deionized water and soft iron ore is 1:1:2. Soak for 3 hours under stirring, filter, and wash the filter residue twice with hot deionized water at 50°C that is 4 times the weight of the filter residue;

[0030] b. Reduction leaching: add deionized water to make the filter residue after twice washing in step a into a slurry, add deionized water to 1 times the weight of the filter residue, add sulfuric acid with a weight concentration of 95% and 27% hydrogen peroxide and stir for leaching for 2.5 hours , filtered to obtain manganese sulfate solution;

[0031] c. Primary crystallization: use the manganese sulfate solution obtained in heating step b with a power supply, evaporate the water, concentrate the mangane...

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Abstract

The invention relates to a production process for high purity manganese sulfate. The process is characterized in that pyrolusite powder is used as a raw material and is added into concentrated sulfuric acid for pretreatment, filtration is carried out after most impurities like calcium, magnesium, potassium and sodium are leached, an obtained filtrate is delivered to a common manganese sulfate production line for recovery and utilization, hydrogen peroxide used as a reducing agent is added into filter residue having undergone washing so as to reduce and leach pyrolusite powder, and a leachate undergoes condensation crystallization and primary recrystallization to obtain a high purity manganese sulfate product.

Description

technical field [0001] The invention relates to a production method of high-purity manganese sulfate, in particular to a method for producing high-purity manganese sulfate by using pyrolusite as a raw material. Background technique [0002] Manganese sulfate is a traditional manganese salt product with a wide range of uses. At present, the domestic manganese sulfate production process mainly uses pyrolusite as raw material, and is divided into two reduction leaching technologies: carbon fire reduction and wet reduction (pyrite, ferrous sulfate or titanium white waste acid and other reducing agents) and acid leaching. Then carry out simple oxidation-hydrolysis iron removal, sulfuration removal of heavy metals, filtration, static precipitation, solution crystallization, centrifugal dehydration and drying, to obtain three grades of manganese sulfate products of industrial grade, feed grade or boutique grade, which are used for chemical fertilizers, Feed, paint, pesticide and o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/10
Inventor 梁敏罗昌璃刘春明刘栋柱黎贵亮邓永光陈发明龙海平
Owner DAXIN MANGANESE MINE BRANCH OF CITIC DAMENG MINING IND
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