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Ultrapure quartz sand and purification process thereof

A quartz sand and process technology, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problems of limited diffusion and dissolution of impurity ions, long leaching time, low product purity, etc., achieve obvious economic and practical application value, improve purification Efficiency and purity, the effect of a simple process

Active Publication Date: 2018-12-25
ANHUI SCI & TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Quartz Co., Ltd. only sold more than 600 tons of high-purity quartz powder in 2014, and only sold more than 400 tons in the first half of 2015, and the capacity utilization rate was less than 10%
The existing purification process is difficult to effectively remove the wrapped impurities inside the quartz, especially the removal effect of the alkali metal ions potassium and sodium inside the quartz sand is even worse, and the impurities inside the quartz sand cannot be deeply removed, and the purity of the quartz sand is difficult to improve. The disadvantages are low acid leaching rate, long leaching time, high cost of wastewater treatment, complex sources of ore raw materials, low product purity and unstable quality
In addition, CN1562743A and CN102180584A also use "cold explosion" and "microwave thermal explosion" technologies to try to produce microcracks on the surface of quartz sand to increase the amount of impurities dissolved in quartz sand, but the impurity ions inside the solid solution of quartz sand under normal pressure Very limited diffusion and dissolution

Method used

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  • Ultrapure quartz sand and purification process thereof
  • Ultrapure quartz sand and purification process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: as figure 1

[0024]The method for purifying quartz sand comprises the steps of:

[0025] 1) Using quartz sand with a silica content of 98.2% as raw material, add a 4mol / L inorganic mixed acid solution, place it in an impingement flow mixer and heat it to 80°C, and perform repeated impact cleaning for 4 hours. The pickled quartz sand in the mixer is subjected to solid-liquid separation to obtain primary washed sand.

[0026] The inorganic mixed acid is composed of hydrofluoric acid and hydrochloric acid, the concentration of the mixed acid is 4mol / L, the concentration of hydrofluoric acid is 0.5mol / L, and the concentration of hydrochloric acid is 3.5mol / L.

[0027] 2) Divide the initial washing sand into two parts, and heat and cool them separately. One part of the initial washing sand is heated to 600 °C for crushing, and the other part is cryogenically cooled to -180 °C. The prepared cold sand and hot sand are sent to the high temperature resistant im...

Embodiment 2

[0033] Embodiment 2: as figure 1

[0034] The method for purifying quartz sand comprises the steps of:

[0035] 1) Using quartz sand with a silica content of 98.4% as raw material, add a 9mol / L inorganic mixed acid solution, place it in an impingement flow mixer and heat it to 80°C, and perform repeated impact cleaning for 4 hours. The pickled quartz sand in the mixer is subjected to solid-liquid separation to obtain primary washed sand.

[0036] The inorganic mixed acid is composed of fluorosulfuric acid and hydrochloric acid, the concentration of the mixed acid is 4mol / L, wherein the concentration of fluorosulfuric acid is 0.5mol / L, and the concentration of hydrochloric acid is 3.5mol / L.

[0037] 2) Divide the initial washing sand into two parts, and heat and cool them separately. One part of the initial washing sand is heated to 800 °C for crushing, and the other part is cryogenically cooled to -200 °C. The prepared cold sand and hot sand are sent to the high temperature...

Embodiment 3

[0043] Embodiment 3: as figure 1

[0044] The method for purifying quartz sand comprises the steps of:

[0045] 1) Using quartz sand with a silica content of 98.9% as raw material, add a 15mol / L inorganic mixed acid solution, place it in an impingement flow mixer and heat it to 100°C, and perform repeated impact cleaning for 6 hours. The pickled quartz sand in the mixer is subjected to solid-liquid separation to obtain primary washed sand.

[0046] The inorganic mixed acid is composed of fluorosulfuric acid, nitric acid and hydrochloric acid. The concentration of the mixed acid is 15mol / L, of which the concentration of fluorosulfuric acid is 3mol / L, the concentration of nitric acid is 2mol / L, and the concentration of hydrochloric acid is 10mol / L.

[0047] 2) Divide the initial washing sand into two parts, and carry out heating and cooling treatment respectively. One part of the initial washing sand is heated to 1000 °C for crushing, and the other part is cryogenically cooled...

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PUM

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Abstract

The invention relates to ultrapure quartz sand and a purification process thereof. The purification process includes: preparing preliminarily washed sand; preparing a secondary particle size homogenized quartz sand product; preparing pickled quartz sand; removing impurities; preparing an ultrapure quartz sand product. The purification process has the advantages that the purification requirements of quartz sand of different metallogenic types can be satisfied, and the purity of the purified products of different quartz sand can reach 99.999-99.99999%; the purification process is simple, practical, innovative, capable of greatly increasing the purification efficiency and purity of high-purity quartz sand and evident in economic and actual application value.

Description

technical field [0001] The invention relates to the field of purification of quartz minerals, in particular to the technical field of production of ultra-pure quartz sand, in particular to a production process and method for ultra-pure quartz sand in which thermal explosion impingement flow and hydrothermal complexation purification are combined. Background technique [0002] High purity quartz powder (high purity quartz) is SiO 2 The general term for quartz powder (powder) raw materials with a purity greater than 99.9%, which is used as the basic raw material for the manufacture of high-end quartz glass products, and is widely used in technical fields such as solar energy, optical fiber communications, electronics industry, semiconductors, lasers, and aerospace. Its product grade can be SiO 2 Purity is divided, that is, low-end ω (SiO 2 )≥99.9% (3N), middle end ω (SiO 2 )≥99.99% (4N), high-end ω (SiO 2 ) ≥ 99.998% (4N8). At present, only seven companies in the United S...

Claims

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Application Information

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IPC IPC(8): C01B33/12
CPCC01B33/12C01P2006/80
Inventor 郭雨秦安山冯纪章陈君华石国亮陈俊明丁志杰郭腾周永生魏居孟刘冠东
Owner ANHUI SCI & TECH UNIV
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