Method for preparing high purity quartz sand

A technology of high-purity quartz sand and quartz sand is applied in the field of preparing quartz sand suitable for the production of polycrystalline silicon materials by physical method, which can solve the problems of high concentration, difficult to achieve, and unattainable preparation of polycrystalline silicon and monocrystalline silicon, etc. Decontamination effect, effect of increasing solubility

Inactive Publication Date: 2009-03-25
晟茂(青岛)先进材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this patent is that the concentration of the acid used is relatively high, and the reaction time is long, and aqua regia, etc. with particularly strong corrosion ability are used, which has a strong corrosion effect on the equipment; in addition, if the conditions involved in the patent are to be used Ultra-l

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0022] Embodiment 1: This example is carried out according to the following steps,

[0023] (1) Roughing: remove obvious impurities and foreign matter in various quartz ore;

[0024] (2) Crushing: use a professional crusher to crush the quartz ore to particles with a particle size of 1-20mm;

[0025] (3) Roasting: using a professional roasting furnace, the natural silica is roasted at 900 ° C for 2 hours;

[0026] (4) Water crushing: After taking out the burned silica, put it in a clean container with cold water, and cool it quickly to achieve the purpose of removing bubbles, hydrology and some encapsulated impurities inside the minerals, so that the minerals are cracked, and the Silica is broken into 2.5mm blocks;

[0027] (5) Pulverization: The water-crushed blocks are dried in an oven at room temperature, then mechanically crushed by wet or dry grinding, and finally crushed into ultra-fine quartz sand of 5-50 μm in a jet mill.

[0028] (6) Magnetic separation: use high g...

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Abstract

The invention relates to a preparation method of high-purity quartz sand. The method adopts quartz sand as basic raw material, removes ore foreign bodies on the surface of sand grains or inside the grains by carrying out roasting and water-granulating to blocky materials, removes certain soluble and flammable impurities in the quartz sand by carrying out the roasting and water-granulating again, and finally removes most of the ore foreign bodies by acid leaching to obtain the high-purity quartz sand. The quartz sand prepared by the method can be used for producing polysilicon materials.

Description

Technical field: [0001] The invention relates to a method for preparing high-purity quartz sand, in particular to a method for preparing quartz sand suitable for producing polycrystalline silicon materials by physical methods. Background technique: [0002] Quartz sand is the basic raw material for the preparation of polycrystalline silicon and monocrystalline silicon, and is widely used in high-tech fields such as semiconductor technology, solar energy, and aerospace. The purity and element content of quartz sand directly affect the quality of the prepared product. At present, the U.S. company Unimin has a relatively high level of preparation of high-purity quartz sand, and its impurity content is within 20 ppm, but its process is complicated and the cost is very expensive. The traditional quartz sand preparation process is: rough selection→crushing→roasting→water crushing→crushing→iron removal→acid soaking→flotation and other processes, and finally made into 80-100 mesh p...

Claims

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Application Information

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IPC IPC(8): C04B14/06C04B20/00
Inventor 杨圣闯潘月秋杨金凤张鑫耿世达
Owner 晟茂(青岛)先进材料有限公司
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