Comprehensive Recovery of Nonmetallic Minerals from Granite Tailings in Henan Province
Experimental study was carried out to realize comprehensive recovery of non-metallic mineral resources from granite tailings in Henan Province,and explore the feasibility of preparing high-purity quartz.The results show that the granite tailings,mainly containing minerals of plagioclase feldspar,quartz,potassium feldspar and mica,have potential to be comprehensively utilized.With a flowsheet consisting sequentially of scrubbing-magnetic separation,pre-treatment of desliming,and mica-feldspar-quartz preferential flotation,a mica concentrate with Al2O3,K2O,Na2O,SiO2 and Fe2O3 contents of 33.84%,8.13%,0.32%,56.78%and 0.121%,a feldspar concentrate with Al2 O3,K2O,Na2O,SiO2 and Fe2O3 contents of 15.89%,2.16%,10.68%,71.06%and 0.124%,and a quartz concentrate with Al2 O3,K2 O,Na2O,SiO2 and Fe2O3 contents of 1.05%,0.17%,0.56%,97.76%and 0.106%,respectively,can be collected.The quartz concentrate can be further purified to obtain a high-purity quartz sand with SiO2 content of 99.994%.
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