期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 156, 期 -, 页码 572-581出版社
ELSEVIER
DOI: 10.1016/j.seppur.2015.10.051
关键词
Pressure oxidative leaching; Converter slag; Selective recovery; Solid-liquid separation
资金
- National Natural Science Foundation of China [21266011, 21566017]
- Jinchuan Group Co., Ltd
- Kunming University of Science Technology [4201252011]
High pressure oxidative acid leaching (HPOXAL) was employed to extract valuable metals from nickel converter slag. Parameters such as sulfuric acid concentration, temperature, liquid/solid (L/S) ratio, leaching time, oxygen partial pressure and particle size were investigated to optimize the solubility of metal values and improve the solid-liquid separation characteristics of the leaching slurry. A highly selective leaching of valuable metals with extraction of >97% for cobalt and nickel, >95% for copper and <0.4% for iron was successfully achieved under the conditions of -150 + 74 mu m particle size, 0.3 mol/L sulfuric acid concentration, 7 mL/g liquid/solid (L/S) ratio and 600 kPa oxygen partial pressure at 200 degrees C for 80 min. Under the conditions, less than 2% silicon was dissolved, and the leaching slurry performed a good solid-liquid separation characteristics with a filtration rate of 433.73 L/m(2) h. The residue containing hematite, silica and <0.1% bases metals was suitable for further disposal. (C) 2015 Elsevier B.V. All rights reserved.
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