Zn,Pb,Ga and Ge were separated and recovered from zinc refinery residues by stepwise leaching.In the first stage,by leaching with H2SO4 media,more than 90%of Zn and 99%of Ga were dissolved,leaving 92%of Ge in the leac...Zn,Pb,Ga and Ge were separated and recovered from zinc refinery residues by stepwise leaching.In the first stage,by leaching with H2SO4 media,more than 90%of Zn and 99%of Ga were dissolved,leaving 92%of Ge in the leaching residue.In the second stage,by leaching with HCl media,approximately 99%of Pb and less than 2%of Ge were selectively dissolved.Finally,the remaining 90%of Ge was extracted in 1 mol/L NaOH solution by destroying the correlation between SiO2 and Ge.XRD pattern of the leaching residue demonstrated that ZnSO4·H2O,PbSO4 and SiO2 were removed sequentially through the stepwise leaching.The proposed process achieved high recoveries of Zn,Pb,Ga and Ge,thus presenting a potential industrial application.展开更多
An oxygen pressure leaching-flotation joint process was proposed to treat Jinbaoshan platinum group minerals to produce a desired concentrate. The result demonstrates that leaching parameters which include particle si...An oxygen pressure leaching-flotation joint process was proposed to treat Jinbaoshan platinum group minerals to produce a desired concentrate. The result demonstrates that leaching parameters which include particle size, stirring speed, liquid-solid ratio, and the dosage of calcium lignosulfonate, simultaneously affect the leaching rates of base metals and the recovery of platinum group metals (PGMs). The complete dissolution of base metals sulfides leads to a reduction in the amount of flotation carrier for enriching PGMs, decreasing the recovery of PGMs. The optimum leaching conditions are determined as follows: liquid-solid ratio of 10 mL/g, 73% occupancy of ore particle size below 0.043 mm, stirring speed of 400 r/min, and 0.6 g dosage of calcium lignosulfonate. Under optimal conditions, the leaching rates of Cu, Ni and Fe are 87.6%, 87.6% and 90.3%, respectively. The grade of PGMs enriched in the flotation concentrate is 420 g/t through the flotation technology.展开更多
基金The authors are grateful for the financial supports from the National Natural Science Foundation of China(51804083,51704081)the National Key Research and Development Project(2018YFC1903104)+2 种基金the Natural Science Foundation of Guangdong Province,China(2019A1515011628)the Science and Technology Planning Project of Guangzhou(201904010106)of ChinaGuangdong Academy of Science Doctor Special Program of China(2020GDASYL-0104027,2019GDASYL-0105079,2019GDASYL-0302011,2019GDASYL-0402003).
文摘Zn,Pb,Ga and Ge were separated and recovered from zinc refinery residues by stepwise leaching.In the first stage,by leaching with H2SO4 media,more than 90%of Zn and 99%of Ga were dissolved,leaving 92%of Ge in the leaching residue.In the second stage,by leaching with HCl media,approximately 99%of Pb and less than 2%of Ge were selectively dissolved.Finally,the remaining 90%of Ge was extracted in 1 mol/L NaOH solution by destroying the correlation between SiO2 and Ge.XRD pattern of the leaching residue demonstrated that ZnSO4·H2O,PbSO4 and SiO2 were removed sequentially through the stepwise leaching.The proposed process achieved high recoveries of Zn,Pb,Ga and Ge,thus presenting a potential industrial application.
基金Projects(51804083,51204060) supported by the National Natural Science Foundation of ChinaProject(2017B090907026) supported by Science and Technology Planning Project of Guangdong Province,ChinaProjects(2018GDASCX-0938,2018GDASCX-0939) supported by Guangdong Academy of Science Doctor Special Program,China
文摘An oxygen pressure leaching-flotation joint process was proposed to treat Jinbaoshan platinum group minerals to produce a desired concentrate. The result demonstrates that leaching parameters which include particle size, stirring speed, liquid-solid ratio, and the dosage of calcium lignosulfonate, simultaneously affect the leaching rates of base metals and the recovery of platinum group metals (PGMs). The complete dissolution of base metals sulfides leads to a reduction in the amount of flotation carrier for enriching PGMs, decreasing the recovery of PGMs. The optimum leaching conditions are determined as follows: liquid-solid ratio of 10 mL/g, 73% occupancy of ore particle size below 0.043 mm, stirring speed of 400 r/min, and 0.6 g dosage of calcium lignosulfonate. Under optimal conditions, the leaching rates of Cu, Ni and Fe are 87.6%, 87.6% and 90.3%, respectively. The grade of PGMs enriched in the flotation concentrate is 420 g/t through the flotation technology.
