Open AccessLeaching of hemimorphite in neutral solution at high temperature
Author(s) -
Duoqiang Zhao,
Shenghai Yang,
Y.-M. Chen,
Chaobo Tang,
Jing He,
H. Li
Publication year - 2020
Publication title -
journal of mining and metallurgy. section b, metallurgy/journal of mining and metallurgy. section b, metallurgy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.42
H-Index - 20
eISSN - 2217-7175
pISSN - 1450-5339
DOI - 10.2298/jmmb191016014z
Subject(s) - leaching (pedology) , ammonium chloride , dehydration , chemistry , atmospheric temperature range , zinc , silica gel , materials science , nuclear chemistry , inorganic chemistry , metallurgy , chromatography , organic chemistry , thermodynamics , biochemistry , physics , environmental science , soil science , soil water
The leaching behavior of hemimorphite in neutral solution (NH4 +-Cl--H2O) was investigated at high temperature (T > 100?C) under a range of experimental conditions. Thermodynamic calculations indicate that the tendency of dehydration of silica gel is significantly enhanced with the increasing temperature. It was shown that the temperature, ammonium chloride concentration, or L/S ratio increased resulted in greater leaching efficiency. The following optimized leaching conditions were obtained: stirrer speed 400r/min, NH4Cl concentration 5.5M, L/S ratio 9mL/g at 160?C for 3h. Under these optimized conditions, the average leaching yield of zinc was 97.82%. The silicon was converted to quartz and remained in the residue. This process can be used to dispose willemite and hemimorphite as it solves the problem of silica gel dehydration.