Method of preparing primary chemical manganese dioxide by oxygenating manganese carbonate under basic condition

Abstract

The invention discloses a method for preparing primary chemical manganese dioxide by oxidizing manganese carbonate under alkaline conditions, belonging to the field of inorganic non-metallic materials. It is characterized in that the primary chemical manganese dioxide is prepared by pyrolyzing manganese carbonate, using air or oxygen as an oxidant, adding alkali to the manganese carbonate solid, mixing well, and thermally decomposing at 150-900°C for 0.2-40 hours. Under this condition, the thermal decomposition product is obtained by oxidation, and after washing with water, the primary chemical manganese dioxide containing manganese dioxide greater than 82%, up to 90% can be obtained; the amount of alkali added is: manganese carbonate weight: weight of alkali=100 grams : 0.1-30 grams. In the presence of alkali, the pyrolysis rate of manganese carbonate is greatly increased, the content of manganese carbonate in the product is greatly reduced, and the content of dioxide is significantly increased. The high-quality primary chemical manganese dioxide obtained is completely decomposed and oxidized, and contains little manganese carbonate. , chemical manganese dioxide with complete particles and high apparent density can be prepared by heavy weighting.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, in particular to a method for preparing primary chemical manganese dioxide by oxidizing manganese carbonate under alkaline conditions. Background technique [0002] The chemical manganese dioxide is widely used as a battery cathode material. The main preparation methods of chemical manganese dioxide are reduction method, direct oxidation method and thermal decomposition method. Thermal decomposition methods include manganese carbonate thermal decomposition method and manganese nitrate thermal decomposition method, etc. The foreign chemical dioxide preparation method is mainly manganese carbonate pyrolysis method. The famous Erachem Europe company (formerly Belgian Sedema company) is the world's largest producer of chemical manganese dioxide The largest companies use the manganese carbonate pyrolysis method. Over the past few decades, our country has carried out relatively systema...

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Problems solved by technology

During the heavy treatment of primary manganese dioxide containing more manganese carbonate, it is difficult to obtain chemical manganese dioxide with high apparent density due to the large amount of carbon dioxide released by the reaction of manganese carbonate and acid.