基于传感器分选技术高效回收稀土铁工艺

Process for Efficient Recovery of Rare Earth Iron Based on Sensor Separation Technology

随着高品位矿床的枯竭,采矿业面临着开采低品位矿床的挑战。矿状矿石分选可以减少磨矿成本,从而防止低品位废物处理昂贵费用,同时提高下游矿物材料质量。为提高白云鄂博稀土矿物元素的综合利用效率对原生稀土矿物进行了基于传感器技术分选试验研究。研究结果表明,在激发电压45 kV、激发电流40 mA、给矿频率30 Hz对、峰背比大于0.84、粒度范围35~75 mm、分离阈值0.55时,获得稀土品位为13.42%、回收率80.42%的稀土精矿产品,为下一步选冶提供了有利条件;富集稀土矿物经弱磁选获得铁品位为61.16%、回收率81.61%的铁精矿;一粗一精浮选稀土获得产率20.80%,品位69.62%、回收率70.57%的稀土精矿。从结果可以看出,X-BOS分选可以提高入选稀土矿物的品位,简化浮选流程,提高选厂的综合经济效益。该成果为提高白云鄂博稀土矿物高效利用提供了一种新的思路。

With the depletion of higher-grade deposits,the mining industry faces the challenge of mining lower-grade deposits.Bulk ore sorting can reduce the cost of grinding ore,thereby preventing the expensive disposal of lower-grade waste,while improving the quality of materials reported to processing plants.To improve the comprehensive utilization efficiency of rare earth minerals in Bayan Obo.Based on sensor-based sorting technology in primary rare earth minerals and their separation was studied.Results indicated that per-concentrate with rare earth grade of 13.42%and recovery of 80.42%was obtained when the excitation voltage was 45kV,the excitation current was 40mA,the feeding frequency was 30 Hz pair,the peak-to-back ratio was greater than 0.85,the particle size range was 35-75mm,and the separation threshold was 0.55,which provided favorable conditions for the next stage of separation and smelting.And then,an iron concentrate with Fe grade of 61.16%and recovery of 81.61%were obtained by low-intensity magnetic separation of pre-concentrate rare earth minerals.Finally,it was obtained rare earth ore concentrate with a grade of 69.62%and productivity of 20.80%,and recovery of 70.57%by one roughing and one cleaning flotation.The results showed that X-BOS sorting can improve the grade of selected rare earth minerals,simplify the flotation process,and improve the comprehensive economic benefits of the plant.The research results provided a new idea for improving the efficient utilization of rare earth minerals in Bayan Obo.