适于金矿堆浸的制粒新技术研究

Study on the New Granulation Technology for Heap Leaching of Gold Ore

堆浸是处理低品位含金矿石的有效方法,然而细粒物料和黏土含量太高的矿石不宜直接堆浸,需先进行制粒预处理,提高矿堆的渗透性,且制粒可大大强化金的浸出,加快金的浸出速度,提高金的浸出率。以某难处理金精矿为原料,使用粒矿和粉矿混合制粒法开展制粒实验,以水泥、石膏、膨润土、聚丙烯酰胺、石灰或几种粘结剂组合作为粘结剂,进行了多组制粒实验。研究表明,由于石膏的浸出性能太差,不适合作为制粒粘结剂;当粒矿与粉矿配比为1∶2,加水量为140~160 m L/kg时,采用适量水泥、石灰与聚丙烯酰胺组成的复合粘结剂开展制粒实验时获得了良好的制粒效果。

Heap leaching is an effective method to deal with low grade gold ore.However,the ores containing much fines and clay are not suitable for direct heap leaching.In order to improve the permeability of ore heap, granulating and pretreatment are necessary.Granulating pretreatment can greatly enhance the gold leaching process and in most cases the leaching rate of the gold can also be improved.The issue researched the granulation of refractory gold ores on laboratory-scale condition.Rock ore and fine ore particle are mixed to granulation, using the cement, gypsum, bentonite,polyacrylamide and lime or several of the bond selection agents as binder.More groups of experiment were carried out, and eventually got the granulation adding appropriate cement, lime and polyacrylamide have better comprehensive performance, and the suitable grain size ratio of ore and powder mine is 1：2,the most suitable water quality is 140-160 mL/kg.Due to the leaching strength of granulation adding gypsum binder is very poor, it＇ s not suitable for use as a binder.