Wet treatment of zinc leaching residue

摘要

PPROBLEM TO BE SOLVED: To improve, in a wet type treating process for zinc residue, the dehydrating property of gypsum produced in a first stage neutralization step, to improve productivity in this step, and to improve the quality of the resultant gypsum. PSOLUTION: The zinc leach residue is leached, and the resultant leachate is put into a first stage neutralization reaction vessel to undergo neutralization by the addition of a neutralizing agent and then separated into a first overflow and a first underflow, and the first overflow is fed to a subsequent step and the first underflow is separated into first stage gypsum and a filtrate. In the above step, the first underflow and/or the filtrate is returned to the first stage neutralization reaction vessel. PCOPYRIGHT: (C)2007,JPO&INPIT