四氧化三锰粒度及微观形貌的控制

Controlling of Particle Size and Micro-morphology for Mn_(3)O_(4)

研究了以硫酸锰为原料,采用空气直接一步氧化法制备四氧化三锰。向反应体系加入不同类型表面活性剂,考察了表面活性剂种类及用量、反应物浓度、搅拌速度、反应温度及氨锰物质的量比等条件对所制备四氧化三锰粒度及形貌的影响。结果表明:表面活性剂对四氧化三锰的粒度和形貌有调控作用,以十二烷基苯磺酸钠(SDBS)为表面活性剂可得到类球形四氧化三锰;在SDBS加入量1.0 g、硫酸锰浓度1.0 mol/L、搅拌速度500 r/min、反应温度70℃、氨锰物质的量比2.6/1条件下,所得四氧化三锰的粒度D_(50)=11.24μm,振实密度达2.47 g/cm^(3),比表面积为0.87 m^(2)/g,锰质量分数为70.58%,产品质量较好。

Using manganese sulfate as raw materials,Mn_(3)O_(4) powder was prepared by direct air one-step oxidation.Different surfactants were added in the reaction system.The effects of surfactant types and dosage,reactant concentration,stirring speed,reaction temperature and ammonia-to-manganese molar ratio on the particle size and morphology of Mn_(3)O_(4) were examined.The results show that surfactants can regulate the Mn_(3)O_(4) particle size and morphology.And a spherical Mn_(3)O_(4) can be prepared using sodium dodecylbenzene sulfonate(SDBS)as surfactant.Under the conditions of SDBS amount of 1.0 g,manganese sulfate concentration of 1.0 mol/L,stirring speed of 500 r/min,reaction temperature of 70℃and molar ratio of ammonia-to-manganese of 2.6/1,Mn_(3)O_(4) particle size(D_(50))is 11.24μm,vibrational density is 2.47 g/cm^(3),specific surface area is 0.87 m^(2)/g,manganese mass fraction is 70.58%.The product quality is better.