微细粒贫赤铁矿重选工艺优化试验研究

Research on Gravity Process Optimization for a Microfine Lean Hematite

为改善司家营重选工艺中微细粒赤铁矿的回收效果,本文以现场水力旋流器的沉砂为研究对象,进行全粒级入选和窄级别入选两种方案的重选工艺优化试验研究。结果表明,矿样全粒级入选可获得铁品位为64.26%,回收率为77.82%的精矿产品,其分级试验结果表明,+0.1 mm粒级品位仅为32.66%,远远低于其他粒级品位,这是造成重选产品品位偏低的重要因素。在窄级别入选试验中,随着矿粒粒级的减小,其选别的最佳浓度值也逐渐减小,最终得到了品位为67.13%,回收率为77.09%的铁精矿产品。与全粒级入选试验相比,窄级别入选试验的效果更好,在回收率相差不大的情况下,铁品位提高了近3%。

In order to improve the recovery effect of gravity separation process for the micro-grained iron ore in Si- jiaying, the hydraulic cyclone sand was used for the research of gravity process optimization through the full grain se- lection test and narrow size test. The results show it can get the iron concentrate products whose grade is 64. 26% and recovery is 77.82% in the full grain selection test. After the grading test, ＋0. 1 mm grain size is only 32. 66%. It is far lower than other grain grade and it is the important factor of low grade gravity concentrate products. In the narrow size test, with the decrease of particle size, the best concentration is gradually reduced. Finally, the grade of iron concentrate is 67. 13% and the recovery is 77.09%. Compared narrow size test is better. In the case of the basically same recovery with the full grain selection test, the effect of the rate, the iron grade was increased nearly 3%.