2015•Nonferrous Metals Science and EngineeringRequires access
Atmospheric leaching of Co white alloy
Liu Zhuoju
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Abstract
The oxidative acid leaching process of Co white alloy containing high silicon is studied. The influences of leaching agent, oxidant dosage, molar ratio of H2SO4/HCl, liquid-solid ratio, leaching temperature and time on leaching rate of cobalt and copper are investigated. The results show that more than 99 % of Co,Fe, Cu can be leached under the following conditions: initial acidity 5.0mol/L, mole ratio of H2SO4/HCl 8:2 as leaching agent, excess coefficient of acidity 1.2, excess coefficient of oxidant(NaClO3) 1.4, leaching temperature 70 ℃ for 2 h. Leaching slurry is easy to be filtrated with no cuprous chloride precipitation and silica gel.