难选氧化锌矿硫化焙烧-浮选试验

Experimental Study on Processing of Zinc Oxide Ore by Sulfurization Roasting-Flotation Method

针对氧化锌矿浮选分离困难、选矿指标低的问题,提出氧化锌矿硫化焙烧-浮选技术方案。以硫磺为硫化剂,通过硫化焙烧,将氧化锌矿物转化为硫化锌矿物,再使用传统的硫化矿浮选法分选。试验原矿含锌5.13%,氧化率达86.55%,主要脉石矿物为石英和方解石。通过焙烧试验,确定最佳焙烧条件为硫磺添加量3%,焙烧温度650℃,焙烧时间60 min,磨矿细度-74μm占85%;然后通过闭路浮选试验,获得锌品位38.96%、锌回收率86.33%的锌精矿。

A sulfurization roasting-flotation method has been proposed and investigated in this paper to solve problems of difficult separation and low ore dressing indexes of the normal flotation for processing zinc oxide ore. In this method, the zinc oxide was roasted by the vulcanizing agent of sulfur and converted to zinc sulfide which was then to have been treated by the conventional flotation method for recovering zinc concentrate. The ore sample used in this investigation contains 5.13% Zn at an oxide rateof 86.55%, with main gangue minerals of quartz and calcite. Based on a series of experiments, the optimum condition for the roasting process has been established with the sulfur addition rate of 3%, roasting temperature of 650℃, roasting time of 60 minutes, and grinding finesse of less than 74 μm, respectively, as 86.33% of the roasted product can be recovered by the closed-circuit flotation method with the zinc concentrate containing s 38.96% Zn.