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Monohydrated mangnese sulfate pyrolysizing process for producing mangness dioxide

A technology of manganese dioxide and manganese sulfate, which is applied in the direction of manganese oxide/manganese hydroxide, etc., can solve the problems of unsuitable chemical manganese dioxide, and achieve the effects of strong battery recovery performance, easy control, and reduced impurity content

Active Publication Date: 2014-01-15
湖南湘科软磁材料有限责任公司
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  • Application Information

AI Technical Summary

Problems solved by technology

The chemical manganese dioxide produced by this method is not suitable for the production of alkaline manganese batteries, so some processes must be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1: the method for producing chemical manganese dioxide by pyrolysis of manganese sulfate monohydrate comprises the following steps:

[0012] Ore powder roasting: take manganese dioxide powder (fineness of 200 mesh) with a content of about 60% and place it in a rotary electric furnace for roasting at a temperature of 750-800 ° C for 2 hours, and roast the manganese dioxide ore powder into manganese trioxide (Mn2O3) .

[0013] Disproportionation reaction: take and recover 2800kg of mother liquor, 800kg of dilute sulfuric acid with a content of 300g / L, and 1200kg of roasted manganese trioxide ore powder (solid-to-liquid ratio 1:3) to prepare ore pulp, and place it in the reaction kettle at a temperature of 92-96°C. React for 60 minutes to make manganese sulfate solution slurry.

[0014] Iron removal: use roasted manganese trioxide ore powder at a temperature between 90 and 96 °C, evenly add it to the manganese sulfate solution slurry while stirring, and use the...

Embodiment 2

[0030] Embodiment 2: the method for producing chemical manganese dioxide by pyrolysis of manganese sulfate monohydrate includes disproportionation and oxidation process, and during the first disproportionation, 1500kg of slag recovery water, 300kg of dilute sulfuric acid, and 600kg of manganese trioxide powder are added together The reaction kettle reaction; during the second disproportionation, take the slag recovery water 800kg, dilute sulfuric acid 100kg, manganese trioxide powder 300kg and add the reactor reaction together; during the third disproportionation, take the ore washing recovery water 800kg, dilute acid 100kg, 300kg of manganese trioxide powder was added to the reaction kettle together for reaction. The rest of the process is the same as that of the first embodiment.

[0031] Through the improvement of the above process technology, the produced chemical manganese dioxide becomes a high-quality raw material for producing alkaline manganese dry batteries, the main...

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Abstract

The present invention relates to a method to produce chemical manganese dioxide by water manganese sulfate pyrolysis including the technics steps of mineral powder roasting, disproportionation reaction, iron removing, manganese sulfate solution preparation, pressure crystallization, dewatering roasting, pyrolysis, redox, disproportionation.oxidation reaction, pickling, repeat washing, neutralization, pressure filtration and drying, etc. The trimanganese tetroxide after pyrolysis is pumped in the oxygen-enriched air with an oxygen content of 60 to 50 percent during redox reaction to lead part of the trimanganese tetroxide to be directly reduced to rough manganese dioxide with the manganese dioxide of more than 75 percent and lead the content of the r-shaped structure of the crystalline structure in manganese dioxide products to be improved from 75 percent to 98 percent, reduce the specific surface of the products and improve the heavy current discharge performance. Through the improvement on the technical skill, the chemical manganese dioxide produced by the present invention has become superior materials to produce alkaline manganese dry cells. The main content of the products produced by the present invention has been improved from 92 percent to 95 to 95.5 percent and the content of impurities has been reduced in large scale. The present invention is suitable for alkaline manganese cell production.

Description

technical field [0001] The invention relates to a production method of chemical manganese dioxide in the field of chemistry, in particular to a method for producing chemical manganese dioxide by pyrolysis of manganese sulfate monohydrate. Background technique [0002] Manganese dioxide is the main cathode material of dry batteries, and its quality plays a decisive role in the performance of zinc-manganese dry batteries. Manganese dioxide produced by electrolysis can meet the quality requirements of high-capacity and high-power battery raw materials. Unfortunately, manganese dioxide produced by electrolysis has the disadvantages of high power consumption, large environmental pollution, large equipment investment, long production cycle and high production cost. As a result, the products are expensive, which restricts the development of the battery industry to a certain extent. Since the 1970s, countries around the world have actively developed chemical manganese dioxide produ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G45/02
Inventor 杜祖德
Owner 湖南湘科软磁材料有限责任公司
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