球形MnCO_3粉的制备及其粒径控制  

Preparation and Particle Size Control of Spherical MnCO_3 Powder

作　　者：周晚珠[1] 叶红齐[1] 韩凯[1] 陈龙[1] 刘辉[1,2] 

机构地区：[1]中南大学化学化工学院,湖南长沙410083 [2]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《稀有金属与硬质合金》2011年第4期13-16,共4页Rare Metals and Cemented Carbides

基　　金：教育部高等学校博士点转向科研基金资助(200805330032);中国博士后科学基金(20080440987)

摘　　要：以MnSO4为锰源,NH4HCO3为沉淀剂,六偏磷酸钠(SHMP)为分散剂,采用液相沉淀法制备出了粒径均一的球形MnCO3粉。考察了反应温度、反应物浓度比、SHMP用量比等因素对MnCO3粉粒径的影响,并利用激光粒度分析仪、扫描电镜和X射线衍射对实验结果进行了表征。研究结果表明,在10～50℃范围内,MnCO3粉的粒径随着反应温度的降低而变小,但反应温度过低时粉末的团聚现象严重。SHMP的用量比η对MnCO3粉的粒径影响很大,在η<10%范围内,随着η的增加,MnCO3粒径逐步减小。当反应温度为30℃,[Mn2+]/[HCO3-]为5∶1,η为7%时,所得产品为粒径约3.1μm且均匀性好、分散性优的球形MnCO3颗粒。Spherical MnCO3 powder of uniform particle size was prepared by liquid phase precipitation using MnSO4 as the manganese source and NH4 HCOa as the precipitating agent and sodium hexametaphosphate （SHMP） as the dispersant. In the paper,the impact of three primary parameters such as reaction temperature,reactant concentration and dosage rate of SHMP on the particle size of MnCO3 powder was investigated and the experimental results were charaeterized by the laser granulometer, scanning electron microscopy and X-ray diffraction. The results showed that at 10～50℃ ,the particle size of MnCOa decreased with the decrease of reaction temperature. However,too low reaction temperature results in serious agglomeration. The SHMP dosage rate η affects the particle size of MnCOa powder to a great extent and the size decreases gradually with the increase of dosage rate when dosage rate is η〈10%. The MnCO3 spherical particles of uniform size （～3.1μm） and excellent dispersibility were obtained under following processing parameters： reaction temperature up to 30℃,the ratio of [Mn2＋]/[HCO3-] up to 5 ： 1 and the dosage rate of SHMP up to 7 0/4o.

关 键 词：MnCO3 液相沉淀法 球形微粒 六偏磷酸钠 

分 类 号：TQ137.12[化学工程—无机化工]