高镁钙磷尾矿酸解制纳米级碳酸钙  

Preparation of nanometer calcium carbonate from high-Ca-Mg phosphorus tailings by acid leaching

作　　者：张萍花 燕云洁 陈建钧[2] 王红艳 张春丽 吴宁 Zhang Pinghua;Yan Yunjie;Chen Jianjun;Wang Hongyan;Zhang Chunli;Wu Ning(Institute of Spintronics and Nanomaterials,School of Chemistry & Chemical Engineering,Suzhou University,Suzhou 234000,China;School of Chemical Engineering,Sichuan University)

机构地区：[1]宿州学院化学化工学院自旋电子与纳米材料研究所,安徽宿州234000 [2]四川大学化学工程学院

出　　处：《无机盐工业》2019年第3期63-66,共4页Inorganic Chemicals Industry

基　　金：国家自然科学基金资助项目(21076163);宿州学院重点科研项目(2017yzd12);宿州学院大学生科研立项(KYLXLKYB18-01);王红艳名师工作室(2016msgzs071)

摘　　要：以磷尾矿经硝酸复合溶剂酸解、除铁铝净化、钙镁分离得到的钙源为原料,采用碳化法制备碳酸钙。主要探讨了制备纳米级碳酸钙过程中碳酸铵溶液浓度、碳化温度、碳酸铵加入量对产物纯度及钙回收率的影响,通过X射线衍射(XRD)、扫描电镜(SEM)、激光粒度仪对碳酸钙的物相、形貌、粒度进行分析。结果表明:在碳酸铵溶液浓度为1.00 mol/L、碳化温度为40℃、碳酸铵与钙离子物质的量比为1.1条件下,制得碳酸钙的纯度为89.27%、钙回收率为85.54%,碳酸钙呈纳米粒状。Calcium source was firstly prepared from phosphorus tailings by acid hydrolysis with nitric acid complex solvent,iron and aluminum removal and calcium and magnesium separation.Nanometer calcium carbonate was then prepared by carbonization method.The effects of ammonium carbonate solution concentration,carbonization temperature and the amount of ammonium carbonate on the purity and calcium recovery of the product were investigated.The phase,morphology and particle size of the product were analyzed by x-ray diffraction,scanning electron microscopy and laser particle size analyzer.The results showed that the purity of product was 89.27 % and the yield of calcium was 85.54 % when the concentration of carbonizing agent was 1.00 mol/L,the carbonization temperature was 40 ℃,and n[(NH4)2CO2]/n(Ca^2+)=1.1.The product was nanogranular.

关 键 词：磷尾矿 酸解 除杂净化 纳米级碳酸钙 

分 类 号：TQ132.32[化学工程—无机化工]