Method for producing bivalent manganous salt

A technology of divalent manganese and manganese dioxide, applied in chemical instruments and methods, manganese halide, manganese nitrate and other directions, can solve the problems of slow reaction speed, high reaction temperature, bringing in other impurities, etc., and achieves low price and high purity. , good adaptability

Inactive Publication Date: 2017-11-07
彭权刚 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the salt reducing agent method has slow reaction speed, high loss, and brings in other impurities; the carbon reducing agent method will emit lead in the raw material into the air, causing heavy metal pollution, etc.
In addition, there are disadvantages such as high reaction temperature and high energy consumption.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: Preparation of manganese sulfate from electrolytic manganese anode slag

[0027] The composition of electrolytic manganese anode slag from an electrolytic manganese plant in Chongqing is shown in Table 1.

[0028] Table 1 Chemical composition of electrolytic manganese anode slag samples

[0029] Element

[0030] Get 200 grams of above-mentioned electrolytic manganese anode slag, pulverize to about 100 meshes of particle average size, then add 1 liter of solution containing sulfuric acid 40 g / liter (prepared with commercially available 98% concentrated sulfuric acid, containing 40g concentrated sulfuric acid in every liter), set In a constant temperature cold water bath at 15 degrees, after the temperature is stable, start stirring, add 10% hydrogen peroxide at a rate of 6 ml / min, and monitor the pH value with an electronic pH meter. During the reaction, the pH value gradually increases as the acid generates salt. , when the pH value is close to ...

Embodiment 2

[0031] Embodiment 2: Preparation of manganese chloride from electrolytic manganese anode slag

[0032] The source of electrolytic manganese anode slag is the same as in Example 1. Take 200 grams of the above-mentioned electrolytic manganese anode slag, pulverize it, put it into a stirred kettle with a volume of 1 L, and place the kettle in a constant temperature cold water bath at 25 degrees. A concentrated hydrochloric acid solution with a mass fraction of 30% was added to hydrogen peroxide with a mass fraction of 5% to form a solution with a pH of 0.7.

[0033] The solution was added to the stirred tank at a rate of 10 ml / min while stirring was started. Use an electronic pH meter to monitor the pH value. When the pH value is close to 6.0, add 30% concentrated hydrochloric acid dropwise to control the pH value to not exceed 6.0. Stop the reaction after 120 minutes, measure the manganese chloride content in the solution, and calculate the conversion rate of manganese to be 90...

Embodiment 3

[0034] Embodiment 3: remove manganese and prepare manganese nitrate from pyrolusite waste residue

[0035] The composition of pyrolusite waste residue from an electrolytic manganese plant in Hunan is shown in Table 2.

[0036] Table 2 Chemical composition of pyrolusite waste residue samples from an electrolytic manganese plant in Hunan

[0037] Element

MnO 2

SiO 2

total iron

TiO 2

CaSiO 3

other

content(%)

2.7

74.07

1.8

6.06

12.47

2.90

[0038] Take 200 grams of the above-mentioned pyrolusite waste residue, grind it to an average particle size of about 80 mesh, and then put it into a stirring kettle, and place the kettle in a constant temperature cold water bath at 5 degrees. Add 3% nitric acid solution at 5 ml / min, 3% mass content hydrogen peroxide solution at a rate of 10 ml / min, and start stirring simultaneously. Use an electronic pH meter to monitor the pH value. When the pH value is close to 6.0, slow...

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PUM

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Abstract

The present invention proposes a method for producing divalent manganese salt, which includes the following operations: mixing raw materials containing manganese dioxide, acidic aqueous solution and hydrogen peroxide, controlling the pH value of the reaction mixture to be no greater than 6.4, and generating divalent manganese salt after stirring ; Wherein, the acidic aqueous solution is an aqueous solution containing one or more of sulfuric acid, hydrochloric acid, nitric acid, acetic acid or citric acid. The invention provides a method with low energy consumption and low pollution, which converts manganese dioxide into divalent manganese salt, or removes manganese dioxide as impurities from raw materials. In the present invention, hydrogen peroxide, as a common chemical product, is cheap, produces water and oxygen after the reaction is completed, has no pollution, and does not bring impurities into the solution. According to specific needs, one or more aqueous solutions of sulfuric acid, hydrochloric acid, nitric acid, acetic acid or citric acid can be used to generate different manganese salts, so the product has good adaptability and high purity.

Description

technical field [0001] The invention belongs to the field of inorganic chemistry, and in particular relates to a production method of a manganese-containing compound. Background technique [0002] In modern industry, manganese and its compounds are used in various fields of the national economy. Among them, the iron and steel industry is the most important field. The amount of manganese used accounts for 90% to 95%. It is mainly used as a deoxidizer and desulfurizer in the process of ironmaking and steelmaking, and used to make alloys. The remaining 10% to 5% of manganese is used in other industrial fields, such as chemical industry (manufacturing various manganese-containing salts), light industry (used in batteries, matches, printing paint, soap making, etc.), building materials industry (glass and ceramics) colorant and fading agent), defense industry, electronics industry, as well as environmental protection and agriculture and animal husbandry, etc. [0003] With the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/10C01G45/06C01G45/08C07C51/41C07C53/10
CPCC01G45/10C01G45/06C01G45/08C01P2006/80C07C51/412C07C53/10
Inventor 彭权刚彭思舟王永熙
Owner 彭权刚
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