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Preparation method of active manganese dioxide for zinc-manganese dry battery

A technology for active manganese dioxide and zinc-manganese dry batteries, which is applied to dry batteries, manganese oxide/hydroxide, battery electrodes, etc., can solve the problem that the discharge performance of active manganese dioxide cannot meet the requirements of high-quality zinc-manganese dry batteries, the preparation process is complex, and the production Long cycle and other problems, to achieve the effect of favorable migration, simple production process and low cost

Pending Publication Date: 2022-01-21
贵州大龙汇成新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process is complex, the production cycle is long, and various chemical reagents need to be added, resulting in high production costs, and the discharge performance of the prepared active manganese dioxide cannot meet the requirements of high-quality zinc-manganese dry batteries.

Method used

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  • Preparation method of active manganese dioxide for zinc-manganese dry battery
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  • Preparation method of active manganese dioxide for zinc-manganese dry battery

Examples

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Effect test

Embodiment 1

[0036] A kind of preparation method of active manganese dioxide for zinc-manganese dry battery, such as figure 1 shown, including the following steps:

[0037] (1) Grinding the natural manganese dioxide manganese ore into powder, the median diameter (D50) of the powder is 13 μm;

[0038] (2) Add concentrated sulfuric acid in the reaction kettle, the concentration is 98%, and then put in manganese dioxide powder, the mass ratio of concentrated sulfuric acid and manganese dioxide is 1:2, keep warm at 150°C, and fully stir for 8 hours;

[0039] (3) Rinse and filter the stirred mixture several times with hot water at 60° C. (about 4 times), until the pH value of the filtrate reaches about 2.5, and obtain the filtered mixture;

[0040] (4) Add an appropriate amount of ammonium bicarbonate to the mixture after suction filtration, stir for 2 hours, until the pH value reaches about 6.5, and obtain a neutralized mixture;

[0041] (5) Rinse and filter the neutralized mixture several t...

Embodiment 2

[0044] A preparation method of active manganese dioxide for zinc-manganese dry batteries, comprising the following steps:

[0045] (1) Grinding the natural manganese dioxide manganese ore into powder, the median diameter (D50) of the powder is 13 μm;

[0046] (2) Add concentrated sulfuric acid in the reaction kettle, the concentration is 98%, and then drop into manganese dioxide powder, the mass ratio of concentrated sulfuric acid and manganese dioxide is 1:1.5, keep warm at 150°C, and fully stir for 8 hours;

[0047] (3) Rinse and filter the stirred mixture several times with hot water at 60° C. (about 4 times), until the pH value of the filtrate reaches about 2.5, and obtain the filtered mixture;

[0048] (4) Add an appropriate amount of ammonium bicarbonate to the mixture after suction filtration, stir for 2 hours, until the pH value reaches about 6.5, and obtain a neutralized mixture;

[0049] (5) Rinse and filter the neutralized mixture several times with hot water at 60...

Embodiment 3

[0052] A preparation method of active manganese dioxide for zinc-manganese dry batteries, comprising the following steps:

[0053] (1) Grinding the natural manganese dioxide manganese ore into powder, the median diameter (D50) of the powder is 18 μm;

[0054] (2) Add concentrated sulfuric acid in the reaction kettle, the concentration is 98%, and then drop into manganese dioxide powder, the mass ratio of concentrated sulfuric acid and manganese dioxide is 1:1.8, keep warm at 150°C, and fully stir for 8 hours;

[0055] (3) Rinse and filter the stirred mixture several times with hot water at 60° C. (about 4 times), until the pH value of the filtrate reaches about 2.5, and obtain the filtered mixture;

[0056] (4) Add an appropriate amount of ammonium bicarbonate to the mixture after suction filtration, stir for 4 hours, until the pH value reaches about 6.5, and obtain a neutralized mixture;

[0057] (5) Rinse and filter the neutralized mixture several times with hot water at 60...

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Abstract

The invention discloses a preparation method of active manganese dioxide for a zinc-manganese dry battery, and belongs to the field of zinc-manganese dry batteries. The preparation method comprises the following steps: (1) grinding natural manganese dioxide manganese ore to obtain ore powder with preset fineness; (2) adding the ore powder into concentrated sulfuric acid, and stirring under a heating condition to obtain a stirred mixture; (3) performing rinsing and suction filtration on the stirred mixture for multiple times to obtain a suction-filtered mixture; (4) neutralizing the suction-filtered mixture until the pH value reaches 6-7; and (5) carrying out rinsing and suction filtration on the neutralized mixture for multiple times, then carrying out drying treatment, and sieving to obtain the active manganese dioxide product. The preparation method has the advantage of short flow, the production process is simple, the cost is low, the crystal form of the natural manganese dioxide is changed through a chemical means, and the discharge activity of the natural manganese dioxide is improved.

Description

technical field [0001] The invention belongs to the field of zinc-manganese dry batteries and relates to a preparation method of active manganese dioxide for zinc-manganese dry batteries. Background technique [0002] Commonly used portable smart electronic products are inseparable from batteries. Batteries are divided into primary batteries and secondary batteries. Primary batteries are non-rechargeable batteries, and secondary batteries are rechargeable batteries. Zinc-manganese dry batteries, one of the primary batteries, are still widely used. [0003] The positive electrode active material used in zinc-manganese dry battery products is manganese dioxide. Manganese dioxide currently used in the battery industry mainly includes natural manganese dioxide (NMD) and electrolytic manganese dioxide (EMD). Natural manganese dioxide has the advantage of low price, but its discharge performance is very poor, and it can only be barely used in ordinary batteries, which cannot mee...

Claims

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Application Information

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IPC IPC(8): C01G45/02H01M4/50H01M6/06
CPCC01G45/02H01M4/50H01M6/06C01P2002/72C01P2006/40C01P2006/80C01P2004/61
Inventor 董雄文申喜元彭天剑刘务华
Owner 贵州大龙汇成新材料有限公司
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