Feldspar and Quartz Comprehensive Utilization of Granite Tailings in Western Henan Province
To achieve the"dual carbon"goal and promote the resource utilization of bulk solid waste,in this manuscript,taking granite tailings in western Henan as the main raw material,the effective separation of feldspar from quartz in granite tailings was realized through the processes of grinding classification,magnetic separation,flotation and acid leaching.Besides,the effects of grinding fineness,magnetic separation intensity and acid concentration on the removal of iron impurities were investigated.The results show that through the technological process of desliming-magnetic separation-flotation-leaching process,feldspar products with Fe2O3 content of 0.34%,K2O+Na2O content of 12.81%,recovery rate above 80%,whiteness of 68.5%and quartz products with SiO2 content of 99.35%and Fe2O3 content of 0.015%can be obtained.The feldspar products meet the requicements of high value-added potassium-sodium feldspar tail products in ceramics,glass and coating industries(JC/T 2507-2019"potassium feldspar powder for glaze",JC/T 875-2001"feldspar for flat glass").This research has reference significance for the use of granite tailings to produce high white and low free silicon.
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