摘要:
我国重庆某煤系高硫稀有金属复合矿中含硫(铁)、铝、稀土等多种有价成分,且部分稀土呈离子吸附形态存在.对该矿铵盐浸出液除铝、铁杂质后得到的低浓度稀土溶液,进行了稀土的萃取、反萃取、制备碳酸稀土试验的研究.确定的工艺条件为:有机相组成10%P507+90%260#磺化煤油、净化液初始pH值为5.5、相比(O/A) 0.6、搅拌时间5 rmin.单级萃取,稀土萃取率为92.79%,两级逆流萃取,稀土萃取率可达99.07%;负载有机相采以稀硫酸三级逆流反萃,稀土反萃率为97.20%,反萃液中TREO可富集至2175mg/L;稀土与钙、镁等杂质得到了有效分离;反萃液经除锌后,与碳酸氢铵反应,制得的碳酸稀土产品质量符合要求;从净化液到产品,稀土回收率达87.85%;萃余液和碳酸稀土合成母液经处理后可用于循环浸出煤系高硫稀有金属复合矿.
关键词:
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浸出液
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萃取
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反萃取
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P507
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碳酸稀土
Abstract:
A coal-measures high-sulfur rare earth complex ore in Chongqing contained a variety of valuable components,such as sulfur (iron)、aluminum、rare earth,etc,and parts of rare earth ions in adsorption form.A low concentration rare earth solution was obtained from ammonium salt leaching of the ore in Chongqing and was treated to remove aluminum and iron impurities.Based on the solution,this research mainly focused on the extraction of rare earth,stripping and preparation of rare earth carbonate.The technology conditions were determined as follows:organic phase composition of 10% P507+90% 260# sulfonated kerosene,the purifying liquid initial pH of 5.5,the phase ratio (O/A) of 0.6,the mixing time of 5 min.By the single-stage extraction,rare earth extraction rate was 92.79%,and by the two stages of countercurrent extraction,rare earth extraction rate could reach 99.07%.By the three stages countercurrent stripping of the loaded organic phase with dilute sulphuric acid,the rare earth stripping rate was 97.20%,and the TREO in the stripping solution could be enriched to 2175 mg/L;The rare earth and impurities including calcium、magnesium were effectively separated;The stripping liquid reacted with ammonium bicarbonate after in addition to the zinc and the quality of rare earth carbonate products met requirements;From the purification solution to the product,rare earth recovery rate could reach 87.85%;Raffinate and mother-liquor in synthesis of rare earth carbonate after treatments could be used for recycle leaching of the high-sulfur rare earth complex ore.
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