Preparation and purification process of quartz sand and quartz powder, as well as their product methods

The present invention discloses a preparation and purification process for quartz sand and quartz powder, as well as a production process for their products: the preparation and purification process for quartz sand includes quartz ore → coarse selection → crushing → water selection → roasting → water crushing → oxalic acid or citric acid leaching → dry or wet grinding → high gradient magnetic separation → grading → combined process washing → flotation → deionized water washing → special drying → vacuum packaging; The preparation and purification process of quartz powder is after quartz sand flotation → ultrafine grinding (dry or wet grinding) → combined process washing → high gradient magnetic separation → electrostatic selection → deionized water washing → classification → special drying → vacuum packaging.

The quartz sand and quartz powder produced by the process of the present invention do not bubble in the production and application of glass and chips, the optical fiber and cable will not break, the glass has no water lines, and it also expands the application fields, suitable for single crystal silicon, chips, optical fiber and cable, military industry, fine chemical industry, and microelectronics.