袁家村铁矿选厂流程考查与分析

对太钢袁家村铁矿2 200万吨/年选矿厂进行了流程考查。考查结果表明, 选矿厂基本达到了设计产能, 铁精矿品位65.10%, 但回收率略低于设计指标;半自磨与球磨指标基本达到设计指标, 原矿处理量931.54 t/h(干基), 但存在球磨、再磨与分级效率低, 溢流粒度组成不合理, 过磨严重等问题;磁选-0.020 mm粒级回收率低;浮选各粒级回收率普遍低于磁选;磨矿分级优化空间较大, 通过优化入选粒度组成可以提高各粒级的金属回收率。

Investigation and Analysis of Processing Flowsheet of Yuanjiacun Iron Mine

The flowsheet of the 22-million-t/a concentrator in Yuanjiacun Iron Mine was examined. It is found that the concentrator almost achieves its designed capacity, with the produced iron concentrate approaching 65.10% Fe grade, but the recovery lower than the desired value. During the processing of 931.54 t/h raw ore, semi-autogenous grinding and ball milling processes can almost reach the designed index. But it is shown there exist the following problems: lower efficiencies in terms of ball milling, regrinding and classification; inappropriate size distribution for the overflow and serious overgrinding; lower iron recovery from the magnetic separation of -0.020 mm fraction; generally lower recovery from the flotation of all size fractions compared to magnetic separation. It is essential to further optimize the grinding-classification processes, and the metal recovery of varied size fractions can be increased by optimizing the size fractions of the feed pulp.