Study on Decomposition Process of High Grade Mixed Rare Earth Concentrates with Sodium Carbonate Roasting
Received:April 28, 2019  Revised:May 05, 2019
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KeyWord:rare earth concentrates; sodium carbonate roast; high grade; leaching
wanghuihui 内蒙古科技大学矿业研究院
limei 内蒙古科技大学矿业研究院;;内蒙古科技大学材料与冶金学院;;轻稀土资源绿色提取与高效利用教育部重点实验室;轻稀土资源绿色提取与高效利用教育部重点实验室
zhangdongliang 轻稀土资源绿色提取与高效利用教育部重点实验室;轻稀土资源绿色提取与高效利用教育部重点实验室
gaokai 轻稀土资源绿色提取与高效利用教育部重点实验室;轻稀土资源绿色提取与高效利用教育部重点实验室
lijianfei 内蒙古科技大学材料与冶金学院
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      Decomposition behavior and selectivity leaching behavior of roasting product of Bayan Obo mixing rare earth concentrates with 65% grade in Na2CO3 roasting system were studied. Effects of roasting temperature, roasting time, sodium carbonate dosage, and size of sodium carbonate on mineral ignition loss, monazite decomposition rate, fluorine fixation rates, leaching rate of Ce and non-Ce-bearing rare earth during roasting decomposition of high-grade mixed rare earth concentrates were investigated. Testing samples were characterized by TG-DSC, chemical analysis, SEM. The results show that mineral ignition loss is 17.94% and monazite precipitation rate is 95.62% under the conditions including roasting temperature of 660 ℃, roasting time of 1.5 h, dosage of sodium carbonate of 24%, and particle size of sodium carbonate of 60-90 μm. When other conditions remain unchanged, roasting duration is prolonged to two hours, fluorine fixation rate is 87.91%. At the same time, upon improving dosage of sodium carbonate to 28%, both Ce leaching rate and non-Ce rare earth extraction rate reach the optimum value, which is 9.14% and 90.55%, respectively.