河北某难选锌铁矿石选矿试验

Beneficiation Test on a Refractory Zinc-iron Ore from Hebei

河北某锌铁矿石可回收利用的金属元素主要为Zn、Fe,并伴生可综合回收的Ag、Cd,但矿石性质复杂,主要有用矿物闪锌矿和磁铁矿嵌布粒度细,与脉石矿物解离困难,属较难选锌铁矿石。为了给该矿石的开发利用提供依据,对其进行了选矿工艺研究。结果表明:在-0.074 mm占85%的磨矿细度和-0.038 mm占70%的粗精矿再磨细度下,以石灰为调整剂、硫酸铜为活化剂、丁黄药为捕收剂、原矿经1粗2扫4精闭路浮选,可获得锌品位为49.15%、锌回收率为91.01%的锌精矿,Ag、Cd富集于锌精矿中,品位分别为162 g/t、0.25%,回收率分别为58.12%、92.58%;浮选尾矿经弱磁粗选—粗精矿再磨至-0.043 mm占82%后2次弱磁精选,可得到铁品位为63.18%、铁回收率为56.09%的铁精矿。

Main valuable minerals of a zinc-iron ore is zinc and ferrum,associated with Ag and Cd that can be comprehensively recovered.Due to the complex properties of the ore,main valuable minerals of sphalerite and magnetite are fine disseminated,and hardly to be liberated from its gangue,which belongs to refractory zinc-iron ore.Beneficiation experiment is carried out in order to provide basis for development and utilization of the ore.The results showed that at the grinding fineness of 85％-0.074 mm and regrinding fineness of 70％-0.038 ram,using lime as the modifier,copper sulfate as activator,and butyl xanthate as collector,zinc concentrate with zinc grade of 49.15％ and recovery of 91.01％ is obtained through one roughing-four cleaning-two scavenging flotation process.Ag of 162 g/t,and Cd of 0.25％,are enriched in zinc concentrate,with recovery of 58.12％ and 92.58％ separately.Iron concentrate with iron grade of 63.18％ and recovery of 56.09％ is received by dealing with tailings of flotation,through low intensity magnetic separation-two cleaning of low intensity magnetic separation at the regrinding fineness of 82％-0.043 mm for rough concentrate.