Journal
MINERALS
Volume 10, Issue 3, Pages -Publisher
MDPI
DOI: 10.3390/min10030224
Keywords
zinc sulfide concentrate; pressure leaching; iron extraction; iron hydrolysis
Funding
- National Natural Science Foundation of China [51434001, 51574034]
- National Key Research and Development Plan of China [2018YFC1900401]
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Dissolved iron exerts significant effects on mineral leaching, impurity removal, and solution purification in the zinc hydrometallurgy process. To date, iron oxidation and migration behaviors are yet to be fully understood and further research on effective regulation mechanisms of iron is required. In this paper, zinc sulfide concentrate was used as the research object. The behaviors of both Zn and Fe during pressure leaching were investigated for varying temperature, acid addition, and leaching time. At temperature of 100160 degrees C, H2SO4/Zn ratio of 0.9:1-1.25:1, and leaching time of 0.5-2.5 h, the zinc extraction increased with temperature, acidity and leaching time. The iron extraction, however, varied differently with increasing temperature, acidity and leaching time: (A) it increased with temperature to 150 degrees C and then decreased at higher temperature, and (B) displayed an initial increase followed by a decrease with respect to the leaching time. Based on the characteristics of the residue phase, chemical phase analysis was used to analyze the residue in detail. The extent of dissolution of iron-containing minerals and the extent of precipitation of ferric ions during the leaching process were quantitatively calculated.
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