METHOD FOR REMOVING IMPURITIES FROM QUARTZ INCLUSIONS BY HYDROTHERMAL DENUDATION COMBINED WITH ACID LEACHING

Abstract: the present invention belongs to the technical field of high-purity quartz processing and discloses a method for removing impurities from quartz inclusions by hydrothermal denudation combined with acid leaching. gas-liquid inclusions on the surface of quartz sand are destroyed by hydrothermal reaction of quartz sand and calcium oxide, and xonotlite produced by the reaction is removed with dilute nitric acid and sodium carbonate solution; and then impurities dissolved in acid and excess acid solution are removed by acid leaching, cleaning and filtering to obtain pure quartz sand. the technology destroys the gas-liquid inclusions by the hydrothermal method and avoids the use of hydrofluoric acid in the acid leaching process, which can effectively reduce the environmental pollution caused by the acid leaching process, exhibiting excellent industrial application potential.

Inventor(s): Wengang LIU, Ruirui ZHANG, Wenbao LIU, Weichao LI, Qing JIA

CPC Classification: C01B33/18 (Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof (preparation of aerogels by dehydrating gels ; treatment to enhance the pigmenting or filling properties ))

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