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Preparation method for high-purity quartz sand

A technology of high-purity quartz sand and quartz material, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problems of impurity ion dissolution, low flotation efficiency, etc., to improve dissolution efficiency, improve purification efficiency and purity, obvious economic and The effect of practical application value

Inactive Publication Date: 2015-02-11
新沂市中大石英科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problems of the dissolution of impurity ions in quartz sand, pickling, alkali washing and low flotation efficiency. On the basis of the existing quartz sand purification technology, electric field induced diffusion, hot pressing New technologies such as pressure alkali washing and electric field intervention flotation greatly improve the efficiency of impurity dissolution and removal, overcome the shortcomings of the above-mentioned existing technologies, and provide a method for preparing high-purity quartz sand

Method used

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  • Preparation method for high-purity quartz sand

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Effect test

Embodiment 1

[0025] Select quartz stone with a purity of more than 99.95% as raw material, after rough washing, crushing, roasting, water quenching, crushing and grading, place it at 200°C and apply a DC electric field with a strength of 200V / cm for 2h to conduct electric field-induced diffusion . Then put it in a pressure-resistant reactor, add 25% hydrochloric acid and 36% hydrofluoric acid, and heat to 50°C for acid leaching for 48 h. Then put the crushed quartz material in a pressure-resistant reaction kettle, add a 1% sodium carbonate solution, and heat to 50°C for alkaline leaching for 1 hour. Place the pickled and alkali-washed quartz material at a temperature of 50°C, apply a DC electric field with an electric field strength of 200V / cm for 1h with a metal electrode, and then put it into a flotation machine for flotation, and then undergo chlorination treatment and sand baking , magnetic separation and other process steps to obtain high-purity quartz sand with the total amount of i...

Embodiment 2

[0028] Select quartz stone with a purity of more than 99.95% as the raw material, after rough washing, crushing, roasting, water quenching, crushing and grading, place it at 300°C and apply a DC electric field with a strength of 500V / cm for 5h to conduct electric field induced diffusion . Then place it in a pressure-resistant reactor, add 25% hydrochloric acid and 40% hydrofluoric acid, and heat to 80°C for acid leaching for 48 h. Then put the crushed quartz material in a pressure-resistant reaction kettle, add a 1% sodium carbonate solution, and heat to 120°C for alkaline leaching for 1 hour. Place the pickled and alkali-washed quartz material at a temperature of 100°C, apply a DC electric field with an electric field strength of 300V / cm for 2 hours with a metal electrode, and then put it into a flotation machine for flotation, and then undergo chlorination and sand baking. , magnetic separation and other process steps to obtain high-purity quartz sand with the total amount ...

Embodiment 3

[0031] Select quartz stone with a purity of more than 99.95% as the raw material, after rough washing, crushing, roasting, water quenching, crushing and grading, place it at 400°C and apply a DC electric field with a strength of 400V / cm for 6h to conduct electric field-induced diffusion . Then put it in a pressure-resistant reactor, add 30% hydrochloric acid and 40% hydrofluoric acid, and heat to 100 ° C for 48 h. Then put the crushed quartz material in a pressure-resistant reaction kettle, add a sodium carbonate solution with a concentration of 1.5%, and heat it to 50°C for alkali leaching for 2 hours. Place the pickled and alkali-washed quartz material at a temperature of 50°C, apply a DC electric field with an electric field strength of 200V / cm for 1h with a metal electrode, and then put it into a flotation machine for flotation, and then undergo chlorination treatment and sand baking , magnetic separation and other process steps to obtain high-purity quartz sand with the ...

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Abstract

The invention relates to a preparation method for high-purity quartz sand, and concretely relates to a purification technology for high-purity quartz sand applicable to prepare a monocrystalline silicon arc quartz crucible. The preparation method comprises: employing quartz as a basic raw material, performing crude washing, crushing, roasting, water quenching, crushing grading, electric-field induction diffusion, hot-pressing acid washing, hot-pressing alkali washing, electric-field intervention flotation, chlorination processing, sand baking, magnetic separation and the like, so as to obtain the high-purity quartz sand with the impurity total quantity controlled in 16 ppm and the purity larger than 99.99%. In the method, the electric-field induction diffusion technology is employed to induce impurity ions in quartz to be diffused to the surfaces of quartz sand particles, then the hot-press acid washing and hot-pressing alkali washing technology is employed for substantially improving the leaching efficiency of impurities in quartz sand, and the electric-field intervention flotation technology helps to improve the floatation removal efficiency of impurity particles.

Description

technical field [0001] The invention belongs to the technical field of preparation of high-purity quartz materials, and in particular relates to a purification technology of high-purity quartz sand used in the preparation of single crystal silicon arc quartz crucibles. [0002] Background technique [0003] High-purity quartz sand is the main raw material for manufacturing quartz glass, solar cells and integrated circuit chips. It is widely used in information electronics, new energy, new materials and other technical fields. The field has a wide range of applications. [0004] With the advancement of science and technology, high-tech industries such as optical power supply, electronics industry, optical communication, and integrated circuits are developing rapidly, and there is a great demand for high-purity quartz raw materials. For example, in the preparation process of single crystal silicon materials, quartz crucible is an important material in the growth process of C...

Claims

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Application Information

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IPC IPC(8): C01B33/12
Inventor 嵇奎军丁铸许伯林
Owner 新沂市中大石英科技有限公司
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