蒙古某铁闪锌矿石选锌流程优化

蒙古某高铁、高硫铁闪锌矿石中金属矿物主要有磁铁矿、闪锌矿、黄铁矿等,闪锌矿呈不规则粒状分布,与黄铁矿、磁铁矿等嵌布关系密切,现场采用1粗3精2扫、精选1尾矿返回至磨矿的中矿顺序返回流程选锌,生产指标偏低。为改善选锌指标,进行了选锌药剂用量及闭路流程优化前后选锌效果对比试验。结果表明,在相同药剂制度情况下,模拟现场闭路流程可取得锌品位为50.98%、回收率为91.10%的锌精矿;将现场扫选1精矿也返回磨矿的优化流程可取得锌品位为52.02%、回收率为92.39%的锌精矿,工艺流程的优化使锌精矿锌品位和锌回收率分别提高了1.04和1.29个百分点。

Optimization of Zinc Recovery Process on a Marmatite Ore in Mongolia

Main metallic minerals of a high iron and sulfur marmatite ore in Mongolia are mainly magnetite,sphalerite,pyrite,etc.Sphalerite is distributed in irregular granular and closely embedded with pyrite,magnetite,etc.The process of one roughing-three cleaning-two scavenging,tailings of one stage cleaning return to grinding for zinc flotation process is adopted,while the index is poor.To improve the zinc concentrate index,tests on reagent dosages of zinc flotation are made,as well as comparison tests of zinc flotation before and after process optimization.Results indicated that,zinc concentrate with zinc grade of 50.98% and recovery of 91.10% is obtained through simulated on-site closed circuit process,while zinc concentrate with zinc grade of 52.02% and recovery of 92.39% is obtained through optimized process of one scavenging concentrate also returned to grinding.Zinc grade and recovery are increased by 1.04 and 1.29 percentage points respectively through optimization.