河南某金尾矿工艺矿物学及石英可选性研究OA

In order to realize the large-scale reduction and high-value utilization of a gold tailings in Henan Province,the chemical composition,mineral composition,particle size distribution,mineral dissemination characteristics and dissociation degree of the gold tailings were studied on technological mineralogy,and on this basis,the experimental study on the selectivity of comprehensive recovery of quartz was carried out.The results show that the particle size of-0.074 mm in the gold tailings accounts for 62.1%,and the mass fractions of quartz,K-feldspar,plagioclase and biotite are 63.91%,12.19%,8.43% and 7.32%,respectively.It also contains a small amount of calcite,dolomite,hornblende and rutile.The complete dissociation degree of quartz in the gold tailings is 68.74%.Most of the quartz is dissociated from potassium feldspar,plagioclase,biotite and other minerals,and only a small amount of quartz is asso-ciated with potassium feldspar,biotite,plagioclase,wollastonite and other minerals.Quartz in gold tailings was recovered by the process of desliming-magnetic separation-scrubbing-reverse flotation iron removal-reverse flotation mica-reverse flotation feldspar,and quartz concentrate with SiO2 mass fraction of 98.580% was obtained.The quartz concentrate was treated by acid leaching with mixed acid,and the product with SiO2 mass fraction of 99.924 0% was obtained,which met the quality requirements of JC/T 2314-2015 silicon raw material for photovoltaic glass for photovoltaic sand.The research results can provide reference for the efficient and comprehensive recovery of gold tailings resources in the future.