Method for processing high-pressure leaching slurry

Abstract

Provided is a method for processing a high-pressure leaching slurry. The method includes: performing a continuous countercurrent washing treatment (also known as countercurrent decantation, CCD) on the high-pressure leaching slurry to obtain a leaching slurry overflow; performing a pre-neutralization treatment on the leaching slurry overflow using a neutralizer to obtain a pre-neutralized slurry; and performing an iron-aluminum removal treatment on the pre-neutralized slurry to obtain iron aluminum slag and an iron-aluminum-removed leaching solution. With the method of the present disclosure, the CCD is performed on the high-pressure leaching slurry obtained subsequent to a high-pressure acid leaching treatment of nickel laterite, to separate nickel laterite leaching residue into a leaching slurry underflow. The pre neutralization treatment is performed on the leaching slurry overflow. In this way, the nickel laterite leaching residue is separated from the pre-neutralized slurry. Therefore, conditions are created for respective resource utilization of tailings obtained from further processing of the nickel laterite leaching residue and the preneutralized slurry obtained subsequent to the pre-neutralization treatment.