摘要
研究了烧碱溶液连续焙烧分解包头混合稀土精矿综合提取有价元素制备氯化稀土的工艺。对混合稀土精矿和烧碱溶液的混合矿浆进行了不同温度的连续焙烧,研究了焙烧温度对稀土分解率、铈氧化率和氟、磷溶出行为的影响,考察了该工艺对不同稀土品位精矿的适应性。结果表明:使用56%品位的稀土精矿,300℃以上焙烧时稀土分解率达到97%以上,铈的氧化率达到93%以上。提出了包头混合稀土矿液碱连续焙烧分解、水洗除氟、盐酸分步溶解、萃取回收磷和铁,中和除钍后得到氯化稀土溶液的资源综合提取工艺,精矿中稀土、氟、磷、钙、铁和钍得到综合回收。
The techniques for decomposition of the bastnasite and monazite rare earth concentrates by al- kali solution was investigated. The mixed slurries of the rare earth concentrates and the alkali solutions were calcined at different temperatures. The impacts of calcination temperatures on the decomposition effi- ciency of rare earth and the oxidation ratio of cerium, and the stripping of fluorine and phosphorous after cal- cinations, as well as the adaptability of the techniques to the mixed rare earth concentrates of different grade were studied. The results showed that if the grade of rare earth concentrates was larger than 56% , and the calcinations temperature decomposition efficiency was higher than 300 ℃, the of rare earth and the oxida- tion ratio of cerium could reach 97% and 93%, re- spectively. The techniques for resource comprehensive recycle was brought forward, which included proce- dures of continuous fluid alkali calcinations and de- composition, removing fluorine by washing, fractional dissolving by HCl, recycle of phosphor and iron by ex- traction, removing thorium by neutralization and final- ly obtaining the solution of rare earth chloride. The chemical elements such as rare earth, fluorine, phos- phorus, calcium, iron and thorium could be recycled.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2012年第5期632-635,共4页
Journal of the Chinese Society of Rare Earths
基金
内蒙古科技厅项目
包头市科技局重大科技发展项目(2010Z2003)资助
关键词
氟碳铈矿
独居石
混合稀土矿
液碱
焙烧
分解率
bastnasite
monazite
mix rare earth concentrate
fluid alkali
calcination
decomposition efficiency
