甘肃肃北某铁矿可选性试验

甘肃肃北某铁矿嵌布粒度细,铁矿物分布粒度小于70μm；矿石中磁性铁矿物占64.29%,弱磁性铁矿物占30.68%,这给铁矿物的有效分选带来难度。针对该矿石特点,创新性的采用“三段磨矿—弱磁选—中矿强磁抛尾后焙烧—再磨弱磁选”的工艺流程进行选铁试验,结果为:铁精矿品位63.50%、回收率52.73%,铁富集物品位41.85%、回收率28.87%。尾矿品位降至8.25%。 

Experimental study on an iron ore in Subei Gansu

Huge dosage of sodium silicate makes the tailing water unsinkable and recycled water can’t be reused in molybdenum ore practice processing. For this problem, classification floatation is discussed in this paper. After crushing and grinding, explorative tests are carried out to determine the optimum classification size: +0.037mm and-0.037mm. Then we carry out flotation tests receptively and the molybdenum grades of concentrate are 51.9% and 47.3%，recoveries are 96.21% and 92.66%. Compared with two flotation results, we find that sodium silicate dosage with classification flotation is less than flotation without classification. Moreover, contrast tests on tailing sedimentation show that the problem of tailing difficult settlement is obviously improved with classification flotation.