Process for producing high-purity manganese dioxide

A manganese dioxide, high-purity technology, applied in manganese oxide/manganese hydroxide and other directions, can solve the problems of difficult peeling, uneven heating, uniform quality, and reduced yield.

Inactive Publication Date: 2009-05-13
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the pyrolysis reaction of manganese nitrate is carried out by means of surface heating, the manganese dioxide generated is easy to form a hard shell on the surface, which is difficult to peel off, which not only reduces the yield, but also easily leads to uneven heating in the pyrolysis process. Difficult to produce products of uniform quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Weigh 300g of 70% manganese nitrate solution and 6g of ammonium carbonate and place them in a reactor, stir evenly and place them in a pyrolysis furnace, set the pyrolysis temperature to 200°C, and carry out thermal decomposition at this temperature until the reaction ends. Finally, 101.1 g of manganese dioxide was obtained, and the product had a purity of 99.9%.

Embodiment 2

[0019] Weigh 400g of 50% manganese nitrate solution and 14g of urea nitrate and place them in a reactor, stir evenly and place them in a pyrolysis furnace, set the pyrolysis temperature to 160°C, and carry out thermal decomposition at this temperature until the reaction ends. Finally, 96.0 g of manganese dioxide product was obtained with a purity of 99.8%.

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Abstract

A method for preparing high-purity manganese dioxide is characterized in that the method comprises the following steps: adding a certain proportion of additives to high-purity manganese nitrate solution with the weight concentration being 30% to 70%; and pyrolyzing at the temperature of 150 to 250 DEG C to obtain the high-purity manganese dioxide, wherein, the selected additives include one or more of ammonium carbonate, ammonium hydrogen carbonate, ammonium nitrate, carbamide and urea nitrate; and the proportion of the additives in the manganese nitrate solution is 1% to 15% by the weight of manganese nitrate.

Description

technical field [0001] The invention relates to the technical field of preparation of inorganic functional materials, in particular to a preparation method of high-purity manganese dioxide. Background technique [0002] High-purity manganese dioxide is mainly related to the application field of inorganic new materials. It is also one of the important raw materials of chemical power sources, and its quality plays a decisive role in the performance of the battery. It can also be used in the manufacture of high-grade ceramics and handicrafts, as an oxidant and catalyst in medicine and food, etc. [0003] The existing method for preparing manganese dioxide is not easy to prepare high-purity manganese dioxide. [0004] Electrolysis is a traditional production method for preparing manganese dioxide, but this method requires large equipment investment, high power consumption, long production cycle, and the highest product purity is 90-94%, so it cannot produce high-purity mangane...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02
Inventor 刘红光叶学海付春明于晓微张晓波
Owner CHINA NAT OFFSHORE OIL CORP
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