SEMI-BATCH MANGANESE REMOVAL FROM A ZINC LEACH SOLUTION USING SO_2/O_2

摘要

The purpose of the present work is to demonstrate the removal of manganese from a neutral leach zinc-rich solution ([Zn] =150 g/L) at 80℃ by oxidative precipitation using a gas mixture of sulphur dioxide (SO_2) and oxygen (O_2). In order to determine the optimum conditions for manganese removal, several bench-scale semi-batch experiments were performed, where the effects of ORP and gas mixing were investigated. These tests showed that SO_2/O_2 is a fast and effective oxidant for removing manganese down to ppm level as long as the appropriate ORP is attained/maintained and gas transfer kinetics are optimized.