用空气直接氧化锰的水解物制备高视密度初级化学二氧化锰

研究了在催化剂R存在下用空气直接氧化氢氧化锰制备高视密度初级化学二氧化锰的方法.该方法是在硫酸锰溶液中加入氨水后获得的锰水解物滤饼在碱性介质中进一步处理,获得的氢氧化锰在一定温度和催化剂存在下用空气直接氧化,将二价锰氧化为四价锰.研究结果表明:氢氧化锰的氧化速度很慢,获得的初级产品中二氧化锰质量分数小于66%;催化剂R能加速氢氧化锰的氧化,且在催化剂R存在下温度、氢氧化锰颗粒大小等因素对其氧化速度有影响;在催化剂R存在和优化条件下,获得了视密度为1.7～1.8和二氧化锰质量分数大于83%的初级二氧化锰.

Preparation of elementary chemical manganese dioxide with high apparent density by direct oxidizing manganese hydrolyzate with air

A method to prepare chemical manganese dioxide by directly oxidizing manganese hydroxide with air in the presence of catalyzer was investigated. The processes of the method included that manganese hydrolyzate was prepared by hydrolysis of manganese sulfate in ammonic medium, the hydrolyzate furthermore hydrolyzed to manganese hydroxide, and manganese hydroxide was oxidized to MnO2 at certain temperature with ir in the presence of catalyzer. The research results indicate that the oxidation rate of manganese hydroxide is slow and the obtained oxidization product contains MnO2 less than 66%. The catalyzer R can elevate the oxidization rate of manganese hydroxide, which is influenced by temperature and the particle size of manganese hydroxide. Elementary manganese dioxide with MnO2 more than 83% and an apparent density of 1.7-1.8 was yielded in the presence of the catalyzer R and by utilization of optimized reaction parameters.