钐钆富集物直接还原蒸馏制备金属钐  

Preparation of Metal Samarium by Direct Reduction-Distillation of Samarium-Gadolinium Enrichment

作　　者：郝占忠[1] 许林成 

机构地区：[1]包头师范学院化学学院,内蒙古包头014030

出　　处：《有色金属（冶炼部分）》2018年第3期69-73,共5页Nonferrous Metals（Extractive Metallurgy)

基　　金：内蒙古自治区自然科学基金项目(2015MS0516);包头师范学院阴山学者培养计划项目

摘　　要：以提铕后的钐钆富集物为原料,金属镧为还原剂,采用氧化物直接还原蒸馏的方法,研究了还原蒸馏温度和时间对金属钐收率的影响,分析了金属接收器内不同区域金属钐中杂质元素的分布规律。结果表明,在钐钆富集物与金属镧摩尔比1∶2.5、系统压力0.1Pa、还原蒸馏温度1 600K、时间1.5h时,金属钐收率可达到93.6%,温度高于1 600K收率反而下降;蒸气压大于金属钐且凝华点较低的杂质主要沉积在接收器的上部,蒸气压小于金属钐且凝华点较高的杂质主要沉积在下部,气体杂质氮氧和间隙杂质碳在接收器三个区域的沉积基本均等,氯在上部区域较高;中部区域金属钐纯度可达到99.92%。The effects of reduction-distillation temperature and time on yield of metallic samarium were studied by direct reduction-distillation of oxides applying samarium-gadolinium enrichment after extraction of europium as raw materials and metallic lanthanum as reductant. Distribution law of impurities in metallic samarium in different zone of metal receiver was analyzed. The results show that yield of metallic samarium is 93.6% under the optimum conditions including molar ratio of samarium-gadolinium enrichment and metallic lanthanum of 1 ： 2.5, system pressure of 0.1 Pa, reduction-distillation temperature of 1 600 K, and time of 1.5 h. The yield will decline when temperature is higher than 1 600 K. The impurities with higher vapor pressure than metallic samarium and lower desublimation point mainly deposite in upper zone of receiver. The impurities with lower vapor pressure than metallic samarium and higher desublimation point mainly deposite in lower zone of receiver. The deposition of gas impurities of nitrogen, oxygen and carbon in three zone of receiver is basically equal, while chlorine is higher in upper zone. The purity of metallic samarium in middle zone can reach 99.92%.

关 键 词：钐钆富集物 直接还原 蒸馏 金属钐 

分 类 号：TG146.4[一般工业技术—材料科学与工程]