关键词: 氧化锌, 重选, 浮选, 脱泥方法

Abstract: As the zinc oxide ore from Puer, Yunnan, contains both slime and zinc-calcite, different beneficiation methods are used to recover the zinc oxide from the run-of-mine ore, including direct flotation, flotation after tabling, and flotation after de-sliming before or after grinding.The test results show that for the zinc oxide ore containing a large amount of slime, direct flotation is hard to achieve good effect; flotation after tabling can lead to a high zinc loss as the tabling recovery is only 50%, leading to a total zinc recovery of only 40.50%; flotation after de-sliming after grinding can obtain a 18.70% increase in zinc recovery compared with gravity separation; and the process of flotation after de-sliming prior to grinding can achieve a 9.46% and 8.30% increase in zinc grade and recovery respectively compared with the process involving a de-sliming after grinding.Now, the new process of flotation after a de-sliming prior to grinding has achieved successful application in industrial production and achieved stable performances, with the zinc concentrate grading 37.21% at a zinc recovery of 64.97%.

Key words: Zinc oxide ore, Gravity separation, Flotation, Methods of de-sliming