摘要
由于白云鄂博原矿性质的不断变化,稀土精矿的性质也随之改变,从而影响后续冶炼工艺REO的收率。通过化学多元素、粒度、配分、化学物相和矿物组成分析对白云鄂博稀土精矿的性质进行了研究,并考察了粒度、REO品位、铁磷比等因素对稀土精矿焙烧浸出的影响。结果表明:白云鄂博品位REO 53.11%的稀土精矿中主要的杂质元素为CaO、P_(2)O_(5)、F、TFe和SiO_(2),REO在-30μm粒级中分布率为90.24%,镧、铈、镨、钕轻稀土配分合量为97.89%,主要稀土矿物为氟碳铈矿和独居石;当稀土精矿的粒度变细和水浸温度、REO品位及铁磷比增加时,均有助于提高焙烧矿REO浸出率,适宜的矿酸比为1:(1.3~1.4),适宜的铁磷比为3:1~4:1。本研究查明了白云鄂博稀土精矿的性质,为后续冶炼工艺的优化提供了理论参考依据。
Due to the continuous changes in the nature of the Bayan Obo raw ore,the physical properties of the rare earth concentrate have also changed,which affects the REO recovery rate of subsequent smelting process.The physical properties of Bayan Obo rare earth concentrate were studied through chemical multi-element,particle size,distribution,chemical phase and mineral composition analysis,and the influence of factors such as particle size,REO grade,iron and phosphorus ratio on the roasting and leaching of rare earth concentrate was investigated.The results show that the main impurity elements in the 53.11%rare earth concentrate of Bayan Obo are CaO,P_(2)O_(5),F,TFe and SiO_(2),the distribution rate of REO in the-30μm particle size is 90.24%,the light rare earths proportion of lanthanum,cerium,praseodymium and neodymium is 97.89%totally,and the main rare earth minerals are bastnaesite and monazite;when the particle size of the rare earth concentrate becomes finer and the water immersion temperature,REO grade and iron-phosphorus ratio increase,All help to increase the REO leaching rate of roasted ore,the suitable mineral-acid ratio is 1:1.3~1.4,and the suitable iron-phosphorus ratio is 3:1~4:1.This study has ascertained the physical properties of the Bayan Obo rare earth concentrate,which provides a theoretical reference for the optimization of the subsequent smelting process.
作者
郭春雷
侯少春
笪宗扬
赵拓
GUO Chunlei;HOU Shaochun;DA Zongyang;ZHAO Tuo(State Key Laboratory of Bayan Obo Rare Earth Resource Researchers and Comprehensive Utilization, Baotou 014030, China)
出处
《矿产保护与利用》
2021年第3期138-143,共6页
Conservation and Utilization of Mineral Resources
基金
白云鄂博稀土资源研究与综合利用国家重点实验室项目(2020Z2143)
内蒙古自然科学基金项目(2020MS05001)。
关键词
白云鄂博
稀土精矿
焙烧
浸出率
Bayan Obo
rare earth concentrate
roasting
leaching rate
