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Method for preparing high-purity quartz sands by using natural vein quartz ores

A technology of high-purity quartz sand and vein quartz is applied in the field of preparing high-purity quartz sand, which can solve the problems of unachievable quartz purity, different purification effects, and no application.

Inactive Publication Date: 2013-01-30
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

A lot of research work has also been carried out in this area in China. After years of research, although some effective purification methods have been found, the purity of quartz still cannot meet the requirements of the high-tech industry, and its raw material sources mainly rely on imports.
In addition, the types, occurrence and distribution of impurities in quartz sand in my country are different, which also brings great difficulty to purification.
The key to the purification process is the control of flotation and acid leaching conditions. Although the flotation method has been converted from the fluorine-free method to the fluorine-free method, the fluorine-free and acid-free method is far less mature than the fluorine-free and acid method, so it has not been used in industrial production; In recent years, many scholars have paid attention to the experimental research of acid leaching purification, but because of the different types of acid used, experimental conditions and methods, the purification effect is not the same

Method used

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  • Method for preparing high-purity quartz sands by using natural vein quartz ores
  • Method for preparing high-purity quartz sands by using natural vein quartz ores

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Screening: Select good quality vein quartz raw ore, and remove the prominent impurities and foreign matter.

[0017] (2) Calcination-water quenching: heat the selected massive vein quartz in a muffle furnace to 900°C and keep it warm for 1 hour. After the calcination, the ore sample is taken out and directly put into water for quenching.

[0018] (3) Drying-crushing-grinding: the above-mentioned treated samples were placed in a vacuum drying oven to be fully dried. Use a jaw crusher to crush the dried quartz blocks into small pieces with a particle size of less than 2cm, and then use a sealed laboratory sample preparation grinder (GJ-2) to grind the pieces into quartz sand with a particle size of 2-100μm .

[0019] (4) Flotation: Weigh 200g of the quartz sand that step (3) obtains, and use appropriate amount of deionized water and 20%H 2 SO 4 The solution is prepared into a solution with pH=5.0, sodium oleate is used as feldspar activator, sodium hexametaphosphat...

Embodiment 2

[0026] (1) Screening: Select good quality vein quartz raw ore, and remove the prominent impurities and foreign matter.

[0027] (2) Calcination-water quenching: heat the selected massive vein quartz in a muffle furnace to 900°C and keep it warm for 1 hour. After the calcination, the ore sample is taken out and directly put into water for quenching.

[0028] (3) Drying-crushing-grinding: the above-mentioned treated samples were placed in a vacuum drying oven to be fully dried. Use a jaw crusher to crush the dried vein quartz block into small pieces with a particle size of less than 2cm, and then use a sealed laboratory sample preparation grinder to grind the pieces into quartz sand with a particle size of 2-100 μm.

[0029] (4) Flotation: Weigh 200g of the quartz sand that step (3) obtains, and use appropriate amount of deionized water and 20%H 2 SO 4 The solution is prepared into a solution of pH=5.0, with sodium oleate as the feldspar activator, sodium hexametaphosphate as ...

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Abstract

The invention relates to a method for preparing high-purity quartz sands by using natural vein quartz ores, which belongs to the technical field of ore machining and raw materials for a quartz glass crucible for producing a drawn monocrystalline silicon. The method comprises the following steps of: using the natural vein quartz ores as raw materials; carrying out high temperature calcining-water quenching on the natural vein quartz ores so as to remove inclusions in the natural vein quartz ores and impurities in gaps of the vein quartz ores; removing almost trace element impurities through a flotation and mixed acid impregnation technology; and finally, washing the vein quartz ores by using ethanol-deionized water to furthest remove organic impurities introduced in the flotation and acid pickling process and other soluble impurities, so as to obtain the high-purity quartz sands, wherein the raw materials are provided for preparing the quartz glass crucible for producing the drawn monocrystalline silicon.

Description

technical field [0001] The invention relates to a method for preparing high-purity quartz sand by using natural vein quartz ore, and belongs to the technical field of mineral processing and production of quartz glass crucible raw materials for drawing single crystal silicon. Background technique [0002] High purity quartz purity requirements SiO 2 The content is more than 99.99%. Because of its excellent high-temperature thermal stability and chemical stability, electrical insulation, optical and radiation resistance properties, it has been widely used in the fields of electronics, semiconductors, aerospace, and optical fiber communications. Usually, the raw material purity requirements of the quartz glass crucible for the growth of single crystal silicon are very strict. If the aluminum content exceeds the standard, the purity of the drawn single crystal silicon will be affected. When the content of sodium and potassium is too high, the softening temperature of the quartz ...

Claims

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Application Information

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IPC IPC(8): C03B1/00
Inventor 吴小文袁学友文瑞龙步超远
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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