浙江某复杂难选银多金属矿石选矿试验

摘要

The silver-polymetallic ore in Zhejiang contains 153 g/t silver,0. 29% copper,0. 83% lead,1. 41% zinc. Copper,lead,and zinc exist mainly in form of sulfide. Main valuable minerals,chalcopyrite,galenite,sphalerite,and dalarnite keep closely intergrowth with each other in uneven grain size and irregular shape. In order to high efficiently utilize the ore,be-neficiation experiment was carried out based on the process mineralogy. The experiment results indicated that:at the grinding fineness of 91. 4% passing 0. 045 mm,and by adopting the process of copper-lead bulk flotation with one roughing-four clean-ing-one scavenging,rough concentrate through one roughing-two cleaning-two scavenging lead depressing and copper floating, rough tailings through one roughing-four cleaning-two scavenging operation,and middles back to the flow-sheet in turn,copper concentrate with copper grade of 22. 47%,silver grade of 1 373 g/t,copper recovery of 69. 08%,silver recovery of 8. 02%, lead concentrate with lead grade of 40. 63%,silver grade of 6 585 g/t,lead recovery of 81. 14%,silver recovery of 71. 64%, and zinc concentrate with zinc grade of 41. 72%,silver grade of 197 g/t,zinc recovery of 79. 85%,silver recovery of 3. 48%were obtained respectively. This experimental closed circuit process is high efficient in the development and utilization of the ore.%浙江某银多金属矿石银、铜、铅、锌含量分别为153 g/t、0．29%、0．83%、1．41%，铜、铅、锌主要以硫化物形式存在，主要有用矿物黄铜矿、方铅矿、闪锌矿之间以及与毒砂之间连生紧密，嵌布粒度粗细不均且形状不规则。为高效开发利用该矿石资源，在工艺矿物学研究基础上进行了选矿试验研究。试验结果表明，在磨矿细度为-0．045 mm占91．4%的情况下，采用1粗4精1扫铜铅混浮、铜铅混合精矿1粗2精2扫抑铅浮铜、混浮尾矿1粗4精2扫、中矿顺序返回流程处理，可取得铜品位为22．47%、银品位为1373 g/t、铜回收率为69．08%、银回收率为8．02%的铜精矿，铅品位为40．63%、银品位为6585 g/t、铅回收率为81．14%、银回收率为71．64%的铅精矿，锌品位为41．72%、银品位为197 g/t、锌回收率为79．85%、银回收率为3．48%的锌精矿。试验闭路流程是该矿石高效开发利用流程。