氨缓冲体系强化高纯重质碳酸锰的制备  

Strengthen preparation of high purity heavy manganese carbonate in ammonia buffer system

作　　者：陈南雄 谢罗生 舒建成[3] 李华成 王春飞 刘作华[3] 

机构地区：[1]中信大锰矿业有限责任公司,广西南宁530028 [2]广西自治区质量技术监督局,广西南宁530022 [3]重庆大学化学化工学院,重庆400044

出　　处：《化工学报》2016年第7期3078-3083,共6页CIESC Journal

基　　金：国家科技支撑计划项目(2015BAB17B00);国家自然科学基金项目(51274261;51404043);重庆大学研究生科研创新项目基金(2015)~~

摘　　要：以碳酸钠和高纯硫酸锰为原料,通过共沉淀法在氨缓冲溶液中制备高纯重质碳酸锰。当硫酸锰和碳酸钠溶液浓度都为1.5 mol·L-1、碳酸钠过量系数为110%、溶液p H为8.5、温度为50℃、滴加速率为120 ml·h-1时,得到的碳酸锰视密度达1.67 g·cm-3,振实密度达2.15 g·cm-3。氨缓冲体系增加了溶液的稳定性,抑制了溶液中氢氧化锰和偏氢氧化锰的生成,制备出的高密度碳酸锰形貌趋于球形,粒径分布均匀,D50平均大小为30.32μm。以本研究制备的碳酸锰为锰原料焙烧得到的四氧化三锰松装密度为1.09 g·cm-3,振实密度为2.18 g·cm-3,锰的含量可达71.85%。High purity and heavy manganese carbonate was prepared via controlling crystallization in ammonia buffer system,with sodium carbonate and high purity manganese sulfate as the starting materials.When the concentration of Mn SO4 and Na2CO3 solution was 1.5 mol·L-1,and Na2CO3 excess coefficient was 110% with adding rate of 120 ml·h-1 at p H 8.5 and 50℃,the apparent density of manganese carbonate was 1.67 g·cm-3 and tap density was 2.15 g·cm-3.Ammonia buffer system increased the stability of the solution,and suppressed the formation of manganese hydroxide and partial manganese hydroxide.The morphology of high density of manganese carbonate was spherical,and particle size with an average size（D50） of 30.32 μm distributed uniformly.Heating the manganese carbonate prepared in this study,the apparent density and tap density of obtained mangano-manganic oxide was 1.09 g·cm-3 and 2.18 g·cm-3,respectively.

关 键 词：结晶 沉淀 优化设计 碳酸锰 四氧化三锰 

分 类 号：TQ031[化学工程]