Process mineralogy characteristics and gold recovery of low grade gold ore
A low-grade gold deposit in Yunnan contains Au 0.69 g/t,which is difficult to enrich.The process mineralogy characteristics of the ore were analyzed by means of chemical analysis,XRD analysis,optical microscope and scanning electron microscope.The gold mine was treated by flotation,shaking table gravity separation and cyanidation leaching respectively to explore the best treatment process.The results show that the grade of Au in the low-grade gold ore is 0.69 g/t,the grade of associated beneficial element silver is low,silver does not have comprehensive recycling value,and the content of harmful element As is high(0.16％).The main structure of the ore is a self-shaped-semi-self-shaped granular structure,porphyritic structure,microcrystalline structure,and other structural structures.The main sulfide minerals in the ore are pyrite,chalcopyrite,galenite and sphalerite,and the disseminated particle size is fine.Other main gangue minerals are quartz,calcite,chlorite and kaolin.The gold in the ore mainly occurs in copper-lead-zinc sulfide minerals,with fine disseminated particle size,and most of them exist in the form of isomorphism.Compared with the three separation methods,the flotation method has the best effect.On this basis,the effects of process parameters such as grinding fineness,inhibitors,dispersants,activators and collectors on gold recovery were systematically studied,and open-circuit and closed-circuit tests were carried out.The results show that under the optimum process parameters of grinding fineness of-0.074 mm accounting 80.60％,water glass of 1 000 g/t,lime of 1 000 g/t,copper sulfate of 200 g/t,butyl xanthate of 100 g/t,butyl ammonium aerofloat of 50 g/t and pine oil of 30 g/t,the gold concentrate with the grade of 17.70 g/t and gold recovery of 71.87％can be obtained by using the mixed flotation process of one roughing,three cleaning and three scavenging,besides the gold recovery effect is good.
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