摘要
澳大利亚某锂辉石矿石是一种典型的难选花岗伟晶岩型矿石,有用矿物除了锂辉石,还有少量锂云母及微量的铌钽矿物;矿样中的主要脉石矿物为石英,其次是钠长石、钾长石、云母以及钠闪石,少量的含铁矿物将是影响锂精矿品质的主要有害杂质矿物.为了确定适宜的矿石处理工艺,在着重进行了单一预先脱泥浮锂试验、预先脱除易浮矿物再浮锂试验、直接浮锂试验及直接浮锂锂精矿磁选脱铁试验基础上,确定了两段一闭路常规破碎、两段连续闭路磨矿、脱泥、弱磁选除铁、碱性矿浆中浮锂、浮选精矿强磁选再除铁的碎磨选流程,并在浮锂前预留了浮云母工艺,设计的精矿Li2O品位为5.50%、回收率为70%.
Abstract
A spodumene ore in Australia is a typical refractory granite pegmatite type ore.In addition to spodumene,there are a small amount of lepidolite and trace niobium tantalum minerals.The main gangue minerals in the ore samples are quartz,followed by albite,potassium feldspar,mica and sodium amphibole.A small amount of iron-containing minerals will be the main harmful impurity minerals affecting the quality of lithium concentrate.In order to determine the appropriate ore treatment process,based on the single pre-desliming and lithium flotation test,pre-removal of easy-to-float minerals and lithium flotation test,direct lithium flotation test and direct lithium flotation concentrate magnetic separation and iron removal test,the two-stage closed-circuit conventional crushing,two-stage continuous closed-circuit grinding,desliming,iron removal by low-intensity magnetic separation,lithium flotation in alkaline pulp,and iron removal by high-intensity magnetic separation of flotation concentrate were determined.The flotation mica process was reserved before lithium flotation.The designed concentrate Li2O grade was 5.50%and the recovery rate was 70%.
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