摘要
由于金川镍原料成分的变化,造成高镍锍含铜升高,打破了磨浮系统的平衡状态,导致铜精矿和镍精矿金属互含较高.浮选产品的质量优劣取决于镍矿物和铜矿物晶体的大小和镶嵌关系,而晶体的大小和镶嵌关系又受保温缓冷条件的影响,因此,有必要探究保温缓冷条件对高镍锍浮选行为的影响规律.试验研究表明,在高镍锍物相结晶的温度区间内,适当延长缓冷时间,可改善辉铜矿和锍镍矿的浮选分离效果.在适宜的缓冷控温条件下,1 次浮选可获得Cu品位53.9%、Cu回收率86.1%的铜精矿,Ni品位66.2%、Ni回收率81.5%的镍精矿,与原样品浮选相比,指标得到显著改善.机理研究表明,控温缓冷后的样品中辉铜矿晶粒尺寸和磨矿单体解离度增大是取得较好浮选效果的根本原因.
Abstract
Due to the changes in the composition of Jinchuan nickel raw materials,the copper content of high-nickel matte is elevated,which changes the equilibrium state of the milling and flotation system,resulting in higher metal intercontain-ment in the secondary copper and nickel concentrates.The quality of flotation products depends on the size and mosaic relation-ship between nickel and copper mineral crystals,while the crystals size and mosaic relationship is affected by heat preservation and slow cooling conditions.Therefore,it is urgent to investigate the influence of heat preservation and slow cooling conditions on the flotation behavior of minerals in high nickel matte.The results showed that under the appropriate slow cooling and tem-perature control conditions,a copper concentrate with 53.9%Cu grade and 86.1%Cu recovery and a nickel concentrate with 66.2%Ni grade and 81.5%Ni recovery can be obtained by 1 roughing test.Compared with the test results of the field sam-ples,the flotation effect of high nickel matte was improved.The mechanism study showed that the flotation effect was better than that of the original sample because of the increase in the grain size and monomer dissociation of pyrochlore in the sample after controlled temperature and slow cooling.
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