真空碳化钙热还原法制备金属锶  

Strontium Preparation with Vacuum Calcium Carbide Process

作　　者：邹兴武[1,2,3] 史永明 王树轩 李波[1,2] ZOU Xing-wu;SHI Yong-ming;WANG Shu-xuan;LI Bo(Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Qinghai Institute of Salt Lakes,CAS,Xining 810008,China;Qinghai Engineering and Technology Research Center of Comprehensive Utilization of Salt Lake Resources,Xining 810008,China;University of Chinese Academy of Sciences,Beijing 101408,China)

机构地区：[1]中国科学院青海盐湖研究所,中国科学院盐湖资源综合高效利用重点实验室,西宁810008 [2]青海省盐湖资源综合利用工程技术中心,西宁810008 [3]中国科学院大学,北京101408

出　　处：《有色金属（冶炼部分）》2019年第6期55-58,共4页Nonferrous Metals（Extractive Metallurgy)

基　　金：青海省科技厅基础研究计划项目(2016-ZJ-780)

摘　　要：对真空碳化钙热还原氧化锶制备金属锶过程进行热力学分析,获得真空条件下还原反应的自由能和还原反应临界温度。并以碳酸锶为原料,采用常压煅烧法获得了氧化锶后与碳化钙、氟化钙混合制团,进行还原反应,考察了还原温度、保温时间、制团压力、碳化钙过量系数等对锶还原率的影响。结果表明,碳化钙真空热还原制备金属锶在一定温度和真空度下能够进行,在真空度为0~100Pa、碳化钙过量20%、压片压力15MPa、还原温度1300℃、保温时间3h的条件下,锶的平均收率可以达到72.8%,金属锶的纯度达到了98%~99%。Thermodynamic analysis of preparation of strontium from strontium oxide by vacuum calcium carbide thermal reduction was carried out,and Gibbs free energy and critical temperature were calculated.Metal strontium was prepared by vacuum calcium carbide reduction process with strontium oxide and calcium fluoride as raw material.The effects of reduction temperature,holding time,briquetting pressure,calcium carbide excess coefficient on strontium reduction rate were studied.The results show that strontium with purity of 98%~99%and strontium reduction rate of 72.8%can be achieved under the following optimum conditions including vacuum degree of 0~100 Pa,calcium carbide excess coefficient of 20%,briquetting pressure of 15 MPa,reduction temperature of 1 300℃,and holding time of 3 h.

关 键 词：金属锶 真空 碳化钙 氧化锶 热还原 

分 类 号：TF803.13[冶金工程—有色金属冶金]