Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 14    No. 6    December 2004

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Coupling leaching of sphalerite concentrate
PENG Peng(彭 鹏)1, 2, XIE Hui-qin(谢惠琴)1, LU Li-zhu(卢立柱)1

1. Institute of Process Engineering, Chinese Academy of Sciences,
Beijing 100080, China;
2. Engineering Command Institute of Chemical Defence, Beijing  102205, China

Abstract: Coupling process of sphalerite concentrate leaching in H2SO4-HNO3 and tetrachloroethylene extracting of sulfur was investigated. Effects of leaching temperature, leaching time, mass ratio of liquid to solid and tetrachloroethylene addition on zinc leaching processes were examined separately. SEM images of sphalerite concentrate and residues were performed by using JEM-6700F field emission scanning electron microscope. The relationship between the number of recycling and extraction ratio of zinc was studied. The results indicate that 99.6% zinc is obtained after leaching for 3h at 85℃ and pressure of 0.1MPa O2, with 20g sphalerite concentrate in 200mL leaching solution containing 2.0mol/L H2SO4 and 0.2mol/L HNO3, in the presence of 10mL C2Cl4. The leaching time of zinc is 50% shorter than that in the common leaching. The coupling effect is distinct. The recycled C2Cl4 exerts little influence on extraction ratio of zinc.


Key words:  sphalerite; H2SO4-HNO3; coupling leaching

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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