Preparation of elementary chemical manganese dioxide with high apparent density by direct oxidizing manganese hydrolyzate with air
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摘要: 研究了在催化劑R存在下用空氣直接氧化氫氧化錳制備高視密度初級化學二氧化錳的方法.該方法是在硫酸錳溶液中加入氨水后獲得的錳水解物濾餅在堿性介質中進一步處理,獲得的氫氧化錳在一定溫度和催化劑存在下用空氣直接氧化,將二價錳氧化為四價錳.研究結果表明:氫氧化錳的氧化速度很慢,獲得的初級產品中二氧化錳質量分數小于66%;催化劑R能加速氫氧化錳的氧化,且在催化劑R存在下溫度、氫氧化錳顆粒大小等因素對其氧化速度有影響;在催化劑R存在和優化條件下,獲得了視密度為1.7~1.8和二氧化錳質量分數大于83%的初級二氧化錳.Abstract: 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 ammonie 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.
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Key words:
- chemical manganese dioxide /
- manganese hydroxide /
- direct oxidization /
- manganese /
- high apparent density /
- catalysis
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