棒介质排列组合对高梯度磁选指标的影响研究

脉动高梯度磁选是微细粒弱磁性矿物的高效选矿技术,通过用微细粒赤铁矿进行脉动高梯度磁选试验,研究棒介质排列组合对高梯度磁选指标的影响。试验发现,棒介质排列组合对高梯度磁选指标具有明显影响,交叉排列优于矩形排列,可以获得更高的精矿品位、铁回收率和分选效率;随介质丝间距的增大和介质丝层数的减小,介质丝对磁性矿物的捕获能力降低,导致尾矿铁品位上升,分选效率下降,而精矿品位变化不明显。可以得出结论,棒介质排列组合优化,可以明显提升高梯度磁选的效能。

Study on effect of arrangement of rod matrix on performance of high gradient magnetic separation

High gradient magnetic separation (HGMS) of rod matrix is widely applied for the concentration of fine weakly magnetic minerals such as oxidized iron ore, ilmenite, wolframite, etc., and the arrangement of rod elements in the matrix as carrier for magnetic particles has a dominant control on the distribution of magnetic field and the dynamic of magnetic particles in the matrix, thereby producing a significant effect the HGMS performance. Pulsating HGMS of ultrafine hematite was investigated to study the effect of the arrangement on the performance using Slice-Matrix Analysis. The results of investigation indicates that the arrangement has a significant effect on the performance; the intersecting arrangement is superior to the rectangular one and achieves a higher concentrate grade, recovery and separation efficiency; with increase in spacing between rod elements in a slice matrix and decrease in number of slice matrixes, the capture capability of the elements for magnetic particles deteriorates, resulting in the increase of tailings grade and the decrease of separation efficiency, but a negligible effect on concentrate grade. It is thus concluded that the combinatorial optimization of rod matrix significantly improves the performance of HGMS.