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研究了使用Floatex密度分选机(FDS)从细粒(<0.1mm)铁矿中去除氧化铝。以含有4.28%氧化铝的螺旋分级机的给矿作为原料。先用水力旋流器脱泥,去除含有较高氧化铝的超细颗粒,使其氧化铝的含量降至3.39%。根据工厂设计的要求,在试验设计中考虑三个因素,即干扰水速度、干涉床层压力和给矿浓度,来定量研究不同参数的影响。研究结果表明,使用一段FDS分选机分选,可以去除给料中72%的氧化铝。可以得到铁回收率为57%,氧化铝含量量为1.66%的铁精矿。使用较大的干扰水可以提高氧化铝的去除率,仅仅降低很少的铁回收率。研究中发现,高的干涉床层压力和低的矿浆浓度对于氧化铝的去除是有利的。目前的研究结果表明,用底流中的水含量能够较好的表征FDS分选机的行为。FDS分选机底流产品中超细颗粒的含量随底流水含量线性增长。研究结果表明,较窄粒级分布的给料对于FDS分选的操作是有利的。将给料分为粗粒级和细粒级,并且分别处理,对于有效去除氧化铝是有益的。
The use of a Floatex Density Sorter (FDS) to study the removal of alumina from fine (<0.1 mm) iron ore was studied. The ore was used as feedstock with a spiral classifier containing 4.28% alumina. The first use of hydrocyclone desliming, removal of ultrafine particles containing higher alumina, the alumina content was reduced to 3.39%. According to the requirements of the plant design, three factors were considered in the experimental design, namely the disturbance water velocity, the interference bed pressure and the ore concentration, to quantitatively study the influence of different parameters. The results show that 72% of the alumina in the feed can be removed using a FDS sorter. An iron concentrate with an iron recovery of 57% and an alumina content of 1.66% can be obtained. Using larger interfering water can increase the alumina removal rate, reducing only the very small iron recovery. It was found in the study that high interference bed pressure and low pulp concentration are favorable for the removal of alumina. The present results show that the water content in the underflow can better characterize the behavior of the FDS sorter. The content of ultrafine particles in FDS separator underflow products increases linearly with the bottom water content. The results show that the narrower particle size distribution of feed is beneficial for FDS sorting operations. Dividing the feedstock into coarse-grained and fine-grained, and separately treated, is beneficial for efficient alumina removal.