Method for preparing high-purity quartz sand from low-grade silica by ultrasonic contact electro-catalysis coupled with organic mixed acid purification

CN119080011BActive Publication Date: 2026-10-16KUNMING UNIV OF SCI & TECH
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Patent Information

Application Number
CN202411197721.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-08-29
Publication Date
2026-10-16
Estimated Expiration
2044-08-29

AI Technical Summary

Technical Problem

但目前关于以低品位硅石为原料通过简单处理获得高纯石英砂的技术还现有报道

Benefits of technology

[0031] This invention involves high-temperature calcination of quartz particles, causing a phase change and volume increase. Quenching with water or water containing organic acids creates cracks in the quartz particles, allowing internal impurities to escape. Then, a mixed organic acid leaching process is used, achieving a green production process without the use of inorganic acids, fluorine, nitrates, or chlorine. Simultaneously, this invention employs ultrasound in conjunction with the organic acid, allowing the acid to better react with internal impurities through the cracks. Using polytetrafluoroethylene (PTFE) microspheres as a catalyst, under ultrasonic conditions, electron transfer occurs at the interface with deionized water, synergistically promoting impurity leaching and ensuring thorough removal of impurities. Furthermore, the PTFE particles themselves do not participate in the reaction, making them easy to recover and reuse, resulting in high-purity quartz sand exceeding 99.99%.

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Abstract

The application relates to a method for preparing high-purity quartz sand from low-grade silica, and belongs to the technical field of high-purity quartz sand preparation. The silica to be treated is placed in a sintering furnace, is baked at 600-1000 DEG C, is quenched in a quenching agent after baking, and quenched silica is obtained; quartz sand is added into a mixed acid solution, 0.5-10g of polytetrafluoroethylene particle pellets is added as a catalyst according to 1 kg of the silica to be treated, ultrasonic leaching is carried out at 50-90 DEG C and 100-300 W for 1-6h, and the leaching liquid and leaching residue are obtained by suction filtration and drying; the leaching residue is ultrasonically washed and dried to obtain high-purity quartz sand; the application can efficiently remove impurities in the quartz sand by strictly controlling the ultrasonic leaching power, temperature and catalyst amount, and high-purity quartz sand with the purity of silicon dioxide higher than 99.99% is obtained.
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