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研究赖特山(Mount Wright)选厂螺旋选矿机回路中的矿物特性以寻求提高氧化铁矿物解离度和回收率的方法。对某一选矿系列中用于粗选、精选和再精选的螺旋选矿机的给矿、精矿和尾矿取样,取样前、后分级筛的筛孔由2mm减小至1.6mm。各样品筛出的粒级用CANMET的MP-SEM-IPS图象分析系统进行分析以测定矿物数和氧化铁矿物的解离特性。用质量平衡法计算每一筛分粒级中的铁、二氧化硅、总氧化铁矿物、赤铁矿、针铁矿、石英、铁镁硅酸盐矿物以及解离的和连生的全氧化铁矿物的回收率。缩小分级筛筛孔使筛下产品中全氧化铁矿物的解离度从89％增至94％,全铁回收率由84.4％增加到85.3％。精选矿砂中氧化铁矿物的解离度亦由70％增至85％,但一75μm粒级仍是在所有情况下氧化铁矿物合格解离的唯一粒级。鉴于螺旋选矿机和磨矿效率所限,推荐在300μm的条件下筛分精选矿砂,+300μm粒级再磨,而 -300μm粒级返回粗选螺旋选矿机。在第3选矿系列,已解离的细粒氧化铁矿物(-106μm)以每小时46t的量流失于尾矿中。该值等于41％的细粒级单体氧化铁矿物,即螺旋选矿机给矿中7％的全部氧化铁矿物,有必要进一步研究探索用其它方法回收这一部分物料的可能性。中间粒度铁颗粒(0％～50％)和推测在-300+75μm粒度范围内的单体脉石因夹带而被螺旋选矿机回收。
Study the mineral characterization in the circuit of Mount Wright mill auger concentrator to find ways to increase iron oxide mineral dissociation and recovery. Sampling ore, concentrate and tailings for the spiral concentrator for rougher, concentrate and re-select in a beneficiation series, the mesh size of the stratified sieve before and after sampling is reduced from 2mm to 1.6mm. Particle sizes of each sample were analyzed with a CANMET MP-SEM-IPS image analysis system to determine the number of minerals and the dissociation properties of the iron oxide minerals. Calculations of iron, silica, total iron oxide minerals, hematite, goethite, quartz, ferromagnesium silicate minerals, as well as dissociated and concomitant total Iron oxide mineral recovery. Shrinking the graded sieve to increase the degree of dissociation of the total iron oxide in the product below the screen from 89% to 94% and the total iron recovery from 84.4% to 85.3%. The degree of dissociation of the iron oxide minerals in the selected ore also increased from 70% to 85%, but a particle size of 75μm remained the only particle size of the qualified dissociation of the iron oxide minerals in all cases. Due to the spiral concentrator and grinding efficiency limitations, it is recommended to screen the selected ore at 300μm, reground at +300 μm and back to the rougher at a -300μm size. In the third beneficiation series, finely divided iron oxide minerals (-106μm) were lost to the tailings in an amount of 46t per hour. This value is equal to 41% of the fine-grained monomeric iron oxide minerals, ie 7% of the total iron oxide mineral in the spiral concentrator, and further research is needed to explore the possibility of recovering this part of the material by other means. Intermediate particle size iron particles (0% to 50%) and presumably in the -300 +75 μm particle size range of monomer gangue by entrainment by the spiral concentrator recovery.