马钢和尚桥铁矿石选矿试验研究

研究了和尚桥铁矿石的矿石特点，进行了矿石的高压辊磨试验研究。在此基础上，按阶段磨矿、阶段选别、细筛及筛上再磨再选和高压辊磨、阶段磨矿、阶段选别、细筛及筛上再磨再选，以及高压辊磨、3～0 mm粗粒抛尾、阶段磨矿、阶段选别、细筛及筛上再磨再选进行了选矿工艺流程的试验研究，分别取得了精矿品位64.87%~66.06%、回收率72.00%左右的较好指标。针对低品位磁铁矿矿石的特点，根据对工艺指标、运行成本和流程合理性的分析对比，推荐高压辊磨、阶段磨矿、阶段选别、细筛及筛上再磨再选和高压辊磨、3～0 mm粗粒抛尾、阶段磨矿、阶段选别、细筛及筛上再磨再选两个流程为和尚桥铁矿石合理选矿工艺流程。

Research on Beneficiation Tests for Masteel Heshangqiao Iron Ores

The ores' characteristics of Masteel Heshangqiao Iron Ore were investigated,and tests on the high-pressure grinding roll were studied.Based on this,a series of beneficiation tests research have been finished from the flow-sheets of stage grinding,stage separation,fine screening,regrinding and re-separation for over-size screening,high pressure grinding roll,stage-separation,fine screening,and again regrinding and re-separation for over-size screening,as well as the flow-sheet of high pressure grinding roll,3~0mm tailing rejection,stage grinding,stage separation,fine screening,and regrinding and re-separation for over-size screenings.A good concentrate grading at 64.87%~66.06% with a 72.00% recovery has been achieved.Due to the characteristics of low grade magnetite,and according to the comparison of the flow-sheet index,operation costs,and flow-sheet reasonability,two flow-sheets consisting of the high-pressure grinding roll,stage grinding,stage separation,fine screening and regrinding and re-separation for over-size screening,as well as the flow-sheet of high-pressure grinding roll,3~0mm tailing rejection,stage grinding,stage separation,fine screening,and regrinding and re-separation for over-size screenings are recommended for Heshangqiao Iron Mine.