摘要
高钙高磷钒渣采用钙化-酸浸提钒后所得溶液中的杂质磷对后续沉钒及氧化钒产品质量均产生不利影响.本文采用煅烧活化硅酸钙方法去除酸性钒溶液中杂质P,通过V-P-S-H 2O系 E -pH图和lg C p-pH图对酸性钒溶液中P的赋存形式进行分析,分别研究在高V/P比酸性含钒模拟液和低V/P比实际钒渣所得钒浸出液两种体系中硅酸钙对杂质P的脱除效果.结果表明酸性钒溶液中杂质P主要以H 2PO - 4 和H 3PO 4形式存在.煅烧活化后的硅酸钙对酸性含钒模拟液中P的脱除效果明显且选择性较强,磷去除率随煅烧温度、溶液体系pH值的增加而升高,钒损失率低于3.5%,但在实际钒渣所得酸性含钒溶液中,当磷去除率约为50%时钒损失率达15%,这是由于实际钒溶液中其他离子对脱P效果产生了不利影响,其作用机制有待进一步研究.
Impurity of phosphorus in vanadium-bearing solution, coming from the vanadium slag with high calcium and high phosphorus treated by calcified roasting and acid leaching, has side effect on both the consequent vanadium precipitation and quality of vanadium pentoxide. Removal of phosphorus from the acidic vanadium solution by calcined CaSiO 3 was proposed in this paper. The E -pH graph of V-P-S-H 2O system and lg C p-pH graph were drawn to analyze phosphorus existing form in the acidic vanadium solution, and efficiency of phosphorus removing in the two cases of vanadium-bearing solution with high V/P ratio and the vanadium leaching solution from vanadium slag with low V/P ratio were studied respectively. The results showed that impurity of phosphorus mainly exists as H 2PO - 4 and H 3PO 4 in the vanadium containing solution. The calcined CaSiO 3 can effectively remove impurity of phosphorus and has a high selectivity to phosphorus in the simulated vanadium-bearing solution, and removal of phosphorus increases with increase of the calcination temperature and pH value of the aqueous system, while vanadium loss is still lower than 3.5%. In the true vanadium solution from vanadium slag treated by calcified roasting process, the removal of phosphorus reaches 50%, while the loss of vanadium is as high as 15%, caused by the other impurity ions.The mechanism needs further study.
作者
张菊花
肖龙桓
曹方
周国军
邹鑫
王鑫杰
薛正良
Zhang Juhua;Xiao Longheng;Cao Fang;Zhou Guojun;Zou Xin;Wang Xinjie;Xue Zhengliang(Key Laboratory for Ferrous Metallurgy and Resource Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China;Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking, Wuhan University of Science and Technology, Wuhan 430081, China;The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China)
出处
《材料与冶金学报》
CAS
北大核心
2019年第3期189-195,201,共8页
Journal of Materials and Metallurgy
基金
国家自然科学基金(51804230)
湖北省教育厅科学研究计划资助项目(Q20181108)
校青年科技骨干培育计划项目(2017xz003)
关键词
酸性钒溶液
脱除P
煅烧硅酸钙
P赋存形式
acidic vanadium-bearing solution
removal of P
calcined CaSiO3
occurrence of P
