Method for purifying high-purity quartz sand through gravity-flotation combined separation

By combining gravity separation pre-enrichment and flotation deep impurity removal, the problem of removing fine Fe and Ti oxides and aluminosilicate impurities in quartz sand was solved, achieving green purification of high-purity quartz sand, avoiding the pollution and high energy consumption of traditional acid leaching methods, and achieving a purity of 99.99%.

CN121623936APending Publication Date: 2026-03-10HUBEI THREE GORGES LAB
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Patent Information

Application Number
CN202511944339.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-22
Publication Date
2026-03-10

AI Technical Summary

Technical Problem

Existing technologies are insufficient to efficiently remove fine Fe and Ti oxides and aluminosilicate impurities from quartz sand at room temperature and pressure. Furthermore, traditional acid leaching methods cause severe pollution and cannot achieve green purification of high-purity quartz.

Method used

A combined process of gravity pre-enrichment and flotation deep impurity removal is adopted. Through crushing and grinding classification, gravity separation by a combination of two-stage shaking table and centrifugal concentrator, combined with multiple pH adjustments and stepwise addition of collectors, selective collection of Fe, Ti oxides and aluminosilicates is achieved, avoiding high-temperature acid leaching and the use of strong acids.

Benefits of technology

This method achieves green and efficient purification of quartz sand, with a SiO2 content of 99.99%, significantly reducing environmental pollution and production costs, improving the quality of gravity concentrate and the stability of flotation, and meeting the production requirements of high-purity quartz.

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Abstract

The invention discloses a process for directly purifying quartz sand through gravity-flotation combined separation, and belongs to the technical field of deep processing of non-metallic ores. An existing acid leaching-roasting method is large in pollution and high in cost, and impurities such as Fe, Ti and Al are difficult to remove at the same time through single reselection or flotation. The method comprises the following steps: firstly, crushing raw ore, performing rod milling, and classifying by a cyclone until d90 is equal to 0.15 mm; then combined reselection is conducted through a two-section table concentrator and a centrifugal machine, pre-enriched concentrate with SiO2 larger than or equal to 99.2% is obtained, and the heavy mineral removal rate is larger than or equal to 65%; then, under different pH conditions, lauric acid, a neutral oil emulsified collecting agent and a mixed amine collecting agent are used for collecting mica and feldspar in a segmented mode, so that the grade of SiO2 is increased to be larger than or equal to 99.9%, and Al2O3 and Fe2O3 are reduced to be larger than or equal to 85% and larger than or equal to 70% relative to gravity concentrate; finally, deionized water washing and vacuum drying are conducted, and the high-purity quartz sand is obtained. The whole process is free of hydrofluoric acid and high-temperature roasting, the recovery rate of SiO2 with the size fraction of-0.6 + 0.1 mm is increased to 93-95%, product indexes are stable, equipment is conventional, and industrial popularization is easy.
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