低氯根氧化钕产业化制备工艺研究  

Industrialized preparation process of low chlorine neodymium oxide

作　　者：孙信梅 Sun Xinmei(Gansu Rare Earth New Material Incorporated Company,Baiyin 730922,China)

机构地区：[1]甘肃稀土新材料股份有限公司,甘肃白银730922

出　　处：《无机盐工业》2018年第9期53-56,共4页Inorganic Chemicals Industry

摘　　要：用草酸沉淀氯化钕生产氧化钕是较为传统的方法,但是该方法生产成本较高,产品市场竞争力较差,一般企业难以接受。近年来,有的企业为降低生产成本改用碳酸氢铵沉淀法,但是这种方法生产的氧化钕其部分物理性能指标达不到用户要求,特别是氧化钕中氯离子含量超过5×10-4(质量分数),达不到产品质量标准。对碳酸氢铵沉淀法制备氧化钕的工艺进行了深入研究,对沉淀方式、沉淀温度、加料比例、加料速度、陈化时间、洗涤次数等影响氧化钕中氯离子残留的因素进行了实验,得到最佳工艺条件,制备出氯离子含量小于2×10-4(质量分数)的氧化钕样品。与草酸沉淀法相比,碳酸氢铵沉淀法可以大幅度降低生产成本,具有显著的经济效益,现已在甘肃稀土新材料股份有限公司规模化生产。By using oxalic acid to precipitate neodymium chloride to produce neodymium oxide is a traditional method,but the production cost is higher,the product market competitiveness is bad,and general enterprises are hard to accept.In recent years,in order to reduce the cost of production,some companies used ammonium bicarbonate precipitation method,but some of its physical performances did not reach the user′s requirements,especially the mass fraction of chlorine ion in neodymium oxide beyond 5×10^-4,which did not meet the product quality standard.Through deep study on ammonium bicarbonate precipitation method,the precipitate way,the precipitation temperature,charging ratio,feeding speed,aging time and washing frequency that would affect the residual chloride ions were tested.The best technology conditions were obtained and the neodymium oxide sample with chlorine ion less than 2×10^-4(mass fraction)was prepared.Compared with oxalic acid preci-pitation method,it could greatly reduce the production cost and had remarkable economic benefits.Moreover,the large-scale production has been realized in Gansu Rare Earth New Material Incorporated Company.

关 键 词：稀土 低氯根 氧化钕 产业化 

分 类 号：TQ133.3[化学工程—无机化工]