Quartz sand alkaline leaching purification process

Abstract

The invention discloses a quartz sand alkaline leaching method purification process which comprises the following steps: alkaline leaching: carrying out stirring reaction on quartz sand minerals to be treated and a strong alkaline solution to obtain a solid-liquid mixture; filtering: filtering the solid-liquid mixture by using filtering equipment to obtain filter residues; leaching: leaching the filter residues with water until the pH value of the leaching water is 7-8 to obtain finished quartz sand; grading: screening out quartz sand with the size fraction smaller than 0.074 mm in the leached finished quartz sand; and flotation: carrying out flotation treatment on the quartz sand of which the size fraction is less than 0.074 mm, wherein the yield of the quartz sand with the size fraction smaller than 0.074 mm in the quartz sand mineral to be treated is 10% or below. The characteristic that the strong alkali solution does not have volatility is utilized, the influence on the human body and the environment is small during industrial application, and compared with strong acid, the danger is lower, the price is lower, and the production cost is lower.

Description

technical field [0001] The application relates to the field of quartz sand preparation, and more particularly, to a purification process of quartz sand by alkali leaching. Background technique [0002] Quartz stone is a non-metallic mineral. Quartz sand is a quartz particle made of quartz stone after crushing. It is milky white or colorless and translucent. The Mohs hardness is 7. silicate minerals, the main mineral component of which is SiO 2 , has been widely used in semiconductor, photovoltaic, ceramics, optics, glass and military fields. [0003] However, quartz sand mostly contains some associated aluminosilicate minerals, such as feldspar, mica, etc., and there are usually iron-containing substances, which are mainly divided into two forms: wrapped iron and impregnated iron, which exist in quartz sand. Coated iron refers to the clay iron-containing material wrapped in the quartz particles and the clay iron-containing material adsorbed on the surface of the quartz par...

AI Technical Summary

Problems solved by technology

[0005] The acid leaching method mostly uses sulfuric acid, nitric acid or hydrochloric acid, but nitric acid and hydrochloric acid are highly volatile, sulfuric acid is highly corrosive, has a great impact on the human body and the environment, and is highly dangerous, while organic acids, such as oxalic acid and acetic acid, Not only has a great impact on the environment and the human body, but also is expensive and the production cost is high

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