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Preparation method of layered chemical manganese dioxide

A manganese dioxide and chemical technology, applied in the field of preparation of layered chemical manganese dioxide, can solve the problems of unstable reaction, expensive raw materials and high production cost, and achieve the effects of easy availability of raw materials, mild reaction conditions and low production cost

Active Publication Date: 2013-06-26
湖南海利锂电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the use of strong oxidants such as potassium permanganate and hydrogen peroxide in this method, the reaction conditions are not easy to control, and it is easy to generate manganese dioxide in other crystal forms, so there are defects such as unstable reaction, expensive raw materials, and high production costs.

Method used

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  • Preparation method of layered chemical manganese dioxide

Examples

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Effect test

Embodiment 1

[0012] Mix 45g of electrolytic manganese dioxide powder with an average particle size of 76μm and a manganese content of 61.11% with 66.8g of solid sodium hydroxide, place it in a box-type resistance furnace and bake at 400°C for 5 hours. The roasted product sodium manganate was leached with tap water at a ratio of liquid to solid mass ratio of 3:1, the leaching temperature was 25°C, and the leaching time was 8 hours to obtain a sodium manganate solution for later use.

[0013] Stir the above sodium manganate solution and heat it up to 75°C, then add 250mL of manganese sulfate solution with a manganese content of 50g / L dropwise into the sodium manganate solution, the addition time is 5 minutes, and keep it warm for 3 hours after the addition is complete. Filter, wash, dry at 120°C, and pulverize to obtain a layered chemical manganese dioxide product. The product contains 78.45% manganese dioxide, 5.52% sodium content, an average particle size of 3.54 μm, and a specific surface ...

Embodiment 2

[0015] Mix 46g of chemical manganese dioxide powder with an average particle size of 45μm and a manganese content of 59.8% with 100g of solid sodium hydroxide, and place it in a box-type resistance furnace for calcination at 500°C for 10 hours. The roasted product sodium manganate is leached with tap water according to the liquid-solid mass ratio of 6:1, the leaching temperature is 40°C, and the leaching time is 6 hours to obtain a sodium manganate solution, which is set aside.

[0016] Stir the above sodium manganate solution and raise the temperature to 25°C, then add 50mL of manganese nitrate solution with a manganese content of 250g / L dropwise into the sodium manganate solution for 50 minutes, and keep warm for 15 hours after the addition. Filter, wash, dry at 120°C, and pulverize to obtain a layered chemical manganese dioxide product. The product contains 77.56% manganese dioxide, 5.82% sodium content, an average particle size of 3.85 μm, and a specific surface area of ​​2...

Embodiment 3

[0018] Mix 45g of electrolytic manganese dioxide powder with an average particle size of 76μm and a manganese content of 61.11% with 200g of solid sodium hydroxide, place it in a box-type resistance furnace and bake at 550°C for 15 hours. The roasted product sodium manganate was leached with deionized water according to the liquid-solid mass ratio of 10:1, the leaching temperature was 30°C, and the leaching time was 0.5 hours to obtain a sodium manganate solution, which was set aside.

[0019] Stir the above sodium manganate solution to heat up to 80°C, then add 155mL of manganese sulfate solution with a manganese content of 80g / L dropwise into the sodium manganate solution, the addition time is 100 minutes, and keep warm for 12 hours after the addition is complete. Filter, wash, dry at 120°C, and pulverize to obtain a layered chemical manganese dioxide product. The product contains 79.33% manganese dioxide, 6.50% sodium content, an average particle size of 2.75 μm, and a speci...

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Abstract

The invention discloses a preparation method of layered chemical manganese dioxide. The method comprises the steps of evenly mixing powder manganese dioxide with solid sodium hydroxide; roasting at a high temperature in an air atmosphere, so as to generate sodium manganate at high temperature from the manganese dioxide and sodium hydroxide; leaching and dissolving the roasted product sodium manganate by water to obtain sodium manganate solution; then adding dissoluble manganese salt solution into the sodium manganate solution to carry out oxidation reduction reaction; and filtering, washing, baking and crushing the reacted materials to obtain the layered chemical manganese dioxide product. The manganese dioxide content of the product is 74-80%; the sodium content is 5.0-6.5%; the mean grain size is 1-5 microns; and the specific surface is 20-25m<2> / g. The preparation method of the layered chemical manganese dioxide disclosed by the invention has the characteristics of being mild in reaction condition, easy to obtain materials, low in production cost and the like; the obtained layered chemical manganese dioxide can be used as an oxidant, a catalyst, a heavy metal ion adsorbent, a vulcanization curing agent and the like for organic chemical reaction.

Description

technical field [0001] The invention relates to a preparation method of layered chemical manganese dioxide. Background technique [0002] Chemical manganese dioxide is an inorganic functional material with excellent performance, environmental friendliness and high technological content. It is widely used, mainly used as the positive electrode material of the battery, as a decolorizer in the glass industry, as a manganese zinc ferrite magnetic material in the electronics industry, as an adsorbent in gas masks, and as an oxidant in the chemical industry , Catalysts, catalysts for purifying hydrogen sulfide and sulfur dioxide in exhaust gas and purifying automobile exhaust in environmental protection. Chemical manganese dioxide has more superior performance than natural manganese dioxide and electrolytic manganese dioxide because of its flexible preparation process, and its specific surface area, crystal structure and chemical activity can be adjusted through synthesis process...

Claims

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Application Information

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IPC IPC(8): C01G45/02
Inventor 彭爱国贺周初余长艳杨慧肖伟庄新娟刘艳闻杰
Owner 湖南海利锂电科技有限公司
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