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Purification method for high-purity quartz with ultra-low metal elements

A technology of metal elements and purification methods, applied in glass forming, silica, glass manufacturing equipment and other directions, can solve the problems of complex process, many fluid inclusions, application limitations, etc., and achieve the effect of simple process and easy operation

Active Publication Date: 2012-09-19
陕西合兴硅砂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

my country's ordinary quartz mineral resources are abundant, but because quartz is associated with various impurity minerals during rock formation and mineralization, such as feldspar, mica, clay ore, etc., the purity is not high, and its application is limited.
At present, ordinary quartz purification technology or process is complex, high energy consumption, serious pollution, or the purity of quartz is not high, it is difficult to meet the high-tech industry's requirements for quartz purity
In addition, although the purity of some quartz can meet the high-purity requirements, there are too many fluid inclusions in the quartz crystal, which cannot meet the requirements for quartz raw materials such as the preparation of quartz crucibles for some specific uses of quartz.

Method used

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  • Purification method for high-purity quartz with ultra-low metal elements
  • Purification method for high-purity quartz with ultra-low metal elements
  • Purification method for high-purity quartz with ultra-low metal elements

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Material selection

[0039] Choose SiO 2 The content of ≥98.5wt%, the total amount of impurity metal elements is 42ppm, the number of fluid inclusions 2 Veined quartz sand. The vein quartz sand is provided by Jiangsu Kaida Quartz Co., Ltd. The method for determining the number of inclusions: ①make the quartz sand into an optical flake; ②observe the optical flake under a transmission microscope; ③select randomly three 1mm under the flake 2 Count the number of inclusions, and finally take the average value.

[0040] (2) Roasting-water quenching

[0041] The 96-250μm quartz sand obtained by the above classification is calcined in a muffle furnace at 300°C for 1 hour, and then placed in ice water for quenching treatment until the quartz sand and ice water have a constant temperature, precipitate, filter, and dry.

[0042] (3) Chemical purification

[0043] The water-quenched product is reacted in a mixed acid at 60°C for 10 hours, and the mixed acid is HF and HNO 3 , HCl mixed ...

Embodiment 2

[0048] (1) Material selection

[0049] Vein quartz raw ore is sorted, crushed, ground, strong magnetic separation, and classified into vein quartz sand of 96~250μm. The vein quartz sand satisfies the number of fluid inclusions2 , SiO 2 The content of ≥98.5wt%, the total amount of impurity metal elements <100ppm.

[0050] (2) Roasting-water quenching

[0051] The grained quartz sand of 96-250 μm obtained by the above classification is roasted in a muffle furnace at 400° C. for 1 hour, and then placed in ice water for quenching treatment until the quartz sand and ice water have a constant temperature, precipitation, filtration, and drying.

[0052] (3) Chemical purification

[0053] The water-quenched product is reacted in a mixed acid at 30°C for 5 hours, and the mixed acid is HF and HNO 3 , HCl mixed solution, the content of HF in the mixed solution is 3wt%, HNO 3 The content of HCl is 4wt%, and the content of HCl is 30wt%.

[0054] (4) Chelation

[0055] The acid leached product in the ...

Embodiment 3

[0058] (1) Material selection

[0059] Vein quartz raw ore is sorted, crushed, ground, strong magnetic separation, and classified into vein quartz sand of 96~250μm. The vein quartz sand satisfies the number of fluid inclusions2 , SiO 2 The content of ≥98.5wt%, the total amount of impurity metal elements is 42ppm.

[0060] (2) Roasting-water quenching

[0061] The grained quartz sand of 96-250 μm obtained by the above classification is roasted in a muffle furnace at 300° C. for 5 hours, and then placed in ice water for quenching treatment until the quartz sand and ice water have a constant temperature, sedimentation, filtration, and drying.

[0062] (3) Chemical purification

[0063] The water-quenched product is reacted in a mixed acid at 90°C for 8 hours, and the mixed acid is HF and HNO 3 , HCl mixed solution, the content of HF in the mixed solution is 4wt%, HNO 3 The content of HCl is 4wt%, the content of HCl is 30wt%, and the mass ratio of the mixed acid to the water quenched produ...

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Abstract

The invention relates to a purification method for high-purity quartz with ultra-low metal elements. The purification method for the high-purity quartz with ultra-low metal elements is characterized by comprising the following steps: (1) 96-250 mu m vein quartz sand is selected, the vein quartz sand meets fluid inclusion quantity <100 per mm <2>, and impurity metal element total amount is <100 parts per million; (2) inclusion is removed through roasting-water quenching or ultrasonic wave treatment; (3) a product obtained through treatment in the step (2) is arranged in mixed acid to be purified through chemical oxidation reaction, reaction temperature is 20-100 DEG C, and reaction time is 5-15 hours; (4) a product obtained through treatment in the step (3) performs chelation reaction for 5-15 hours in oxalic acid solution at the temperature of 50-100 DEG C; and (5) after the chelation reaction, quartz is filtered, washed to neutral and dried to obtain the high-purity quartz. According to the high-purity quartz with ultra-low metal elements obtained by the purification method, SiO2 content of the high-purity quartz can reach above 99.995%, the impurity metal element total amount is <30 parts per million, the fluid inclusion is <20 per mm<2>, and the high-purity quartz can meet requirements of some special purposes.

Description

Technical field [0001] The invention belongs to the technical field of purification of inorganic non-metallic materials, and specifically relates to a purification method of ultra-low metal element high-purity quartz. Background technique [0002] Ultra-low metal element high-purity quartz refers to SiO 2 Quartz sand with a content of ≥99.99% and a total amount of impurity metal elements <30ppm. High-purity quartz has excellent optical properties, thermal shock resistance, high temperature resistance, radiation resistance, electrical insulation and other physical and chemical properties. [0003] With the urgent global demand for low-carbon energy-saving technologies, the solar photovoltaic cell industry and contemporary information technology have developed rapidly. Various crystalline silicon materials (including polycrystalline silicon and monocrystalline silicon) have an increasing demand for ultra-low metal elements and high-purity quartz materials, and crystalline silicon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12C03B20/00
Inventor 雷绍民曾华东张凤凯慎舟马球林钟乐乐
Owner 陕西合兴硅砂有限公司
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