内蒙某复杂铜铅锌硫化矿选矿工艺研究

内蒙某矿业公司的复杂铜铅锌硫化矿石铜、铅、锌矿物共生关系非常密切而复杂,给选矿造成极大难度。为了给该矿石的开发提供可行方案,进行了多方案的详细选矿试验,结果表明,常规浮选工艺无法有效分选该矿石,而采用铅重选—铜锌混合浮选再分离浮选的工艺流程,可以获得铅品位为57.20%、铅回收率为54.18%的铅精矿,铜品位为13.35%、铜回收率为57.11%的铜精矿和含锌18.78%、锌回收率为41.94%的富锌物料,富锌物料可以与公司其他选厂锌品位较高的锌精矿搭配销售。

内蒙古某低品位难选铅锌矿石选矿工艺研究

内蒙古某铅锌矿石由于铅锌品位低、锌主要以铁闪锌矿形式存在、铅锌矿物嵌布粒度细且与其他矿物共生密切、含有较多与铁闪锌矿可选性相近的磁黄铁矿而难选。根据矿石性质,采用优先浮铅—铅尾矿弱磁选分离磁黄铁矿—弱磁选尾矿浮锌—锌尾矿浮黄铁矿工艺流程处理该矿石,闭路试验获得了铅品位为42.27%、铅回收率为71.46%的铅精矿,锌品位为44.11%、锌回收率为70.93%的锌精矿及硫品位为34.89%、硫回收率为85.66%的综合硫精矿,从而为该矿石的合理开发利用提供了依据。

某含细粒磁黄铁矿铁锌矿石选矿工艺研究

某铁锌矿石中可选矿回收的目的矿物为磁铁矿和闪锌矿,但部分闪锌矿中包裹有磁性较强、粒度较细的磁黄铁矿,处理不当易导致铁精矿中硫含量超标或影响锌精矿品位。为了给该矿石的开发提供技术支撑,对其进行了选矿工艺研究。结果表明:采用先浮选锌后弱磁选铁的原则流程,可以解决铁精矿硫超标问题;将锌粗精矿再磨至-400目占85%后再精选,可以保证锌精矿品位。试验最终获得了锌品位为48.74%、锌回收率为86.92%的锌精矿和铁品位为63.29%、铁回收率为90.58%、硫含量为0.29%的铁精矿。

四川某高氧化率锌矿石选矿试验研究

四川会理某氧化锌矿石中的金属矿物主要为菱锌矿、硅锌矿、异极矿,脉石矿物主要为方解石、白云母。由于矿石氧化程度高、泥化严重,属极难选氧化锌矿石。为确定矿石的合适开发利用工艺进行了选矿试验研究。结果表明,矿石适宜采用反浮选工艺脱硫脱泥,不适宜采用传统先浮硫化锌矿物的工艺;矿石在磨矿细度为-200目占80%的情况下,采用1次反浮选脱硫脱泥,1粗2精1扫、中矿顺序返回流程选锌,最终获得锌品位29.38%、回收率68.40%的锌精矿。

Sulfidation roasting of zinc leaching residue with pyrite for recovery of zinc and iron

Zinc leaching residue(ZLR) contains high content of valuable metals such as zinc and iron. However, zinc and iron mainly exist in the form of zinc ferrite, which are difficult to separate and recover. This study proposed a new process involving sulfidation roasting, magnetic separation and flotation to recover zinc and iron in ZLR. Through sulfidation roasting of ZLR with pyrite, zinc and iron were converted into ZnS and Fe3 O4. The effects of pyrite dosage, roasting temperature and roasting time on the sulfidation of zinc in ZLR were investigated. The results showed that the sulfidation percentage of zinc reached 91.8% under the optimum condition. Besides, it was found that ball-milling was favorable for the separation and recovery of zinc and iron in sulfidation products. After ball-milling pretreatment, iron and zinc were enriched from sulfidation products by magnetic separation and flotation. The grade of iron in magnetic concentrates was 52.3% and the grade of zinc in flotation concentrates was 31.7%, which realized the recovery of resources.