沉积型磷块岩的重介质选矿技术

HEAVY MEDIUM SEPARATION TECHNIQUE FOR SEDIMENTARY PHOSPHATE ROCK

本文以湖北宜昌磷矿为例说明重介质选矿技术在沉积型磷块岩中的应用,研究突破了回收磷块岩单矿物的传统观念,将分选单元扩大到磷块岩集合体条带,从根本上解决了该类型矿石选矿存在细度、温度、药耗高和浮选时间长的难题。半工业性选矿试验采用“重介质+浮选”联合工艺流程,从P_2O_5晶位为23.50％、MgO3.40％的原矿中选得P_2O_5品位为31.19％、MgO1.41％的优质磷精矿,P_2O_5回收率达87.99％。该工艺应用于沉积型磷块岩中既获得精矿又抛弃尾矿在国际上尚属首次,为我国磷矿资源的利用开辟了一条新的途径。

In this paper, a new technology of using heavy medium separation technique to the benificiation process of phosphate rock is described, taking the test on the phosphate rock from Yi Chang, Hubei province of China as an example. This technique was set up on the new concept of taking the phosphate rock aggregate stripes, not the individual mineral, as recovering unit, which is a significant break-through made in the study. With this technique, some problems existed in the benificiation process of phosphate rock could then be solved, and a large quantity of this kind of phosphorous ore resources could be exploited reasonably and effectively. This is an advancing technique in the world. The pilot tests were carried out with combined flowsheet of heavy medium separation and flotation, and a concentrate grading 31. 49%P2O6 and 1. 41% MgO with the recovery of 87.99% was obtained from the crude ore containing 23. 50% of P2O5 and 3. 40% of MgO.