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A process for removing gas-liquid inclusions in high-purity quartz sand

A technology of high-purity quartz sand and a process method, which is applied in the field of purification of high-purity quartz sand, can solve the problems of unenvironmental production process, bringing in water molecules, and being too complicated, so as to avoid environmental pollution and harsh operation conditions. Simple and easy effects

Active Publication Date: 2018-03-02
XIANGTAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The existing removal methods of gas-liquid inclusions in quartz sand mainly include: acid-base differential corrosion method, cold / heat burst method, chlorination degassing method, microwave radiation-acid leaching method, etc., which remove gas-liquid inclusions The effect is not ideal, or it is too complicated, there are safety hazards in the operation, and the production process is not environmentally friendly
[0007] Existing researches in this field believe that the gas-liquid inclusions cannot be completely broken or the impurities after the gas-liquid inclusions are broken can not be peeled off only by microwave treatment, so the quality requirements of the first-grade crystal cannot be met. Therefore, on the basis of microwave treatment, it is necessary to combine Various other treatments, including external loading (e.g. ball milling), acid etching, etc.
The applicant has been committed to the research of microwave treatment of high-purity quartz sand for a long time. In the previous research, it was concluded that microwave treatment of high-purity quartz sand could not meet the quality requirements of natural crystals, and it was obtained by combining other external load and / or acid etching treatment methods. The effect is not ideal, and the treatment methods such as acid etching are not environmentally friendly. The key is that impurities such as water molecules will still be brought in during the treatment process.

Method used

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  • A process for removing gas-liquid inclusions in high-purity quartz sand
  • A process for removing gas-liquid inclusions in high-purity quartz sand
  • A process for removing gas-liquid inclusions in high-purity quartz sand

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Embodiment 1 Optimal experiment of quartz placer raw materials suitable for the method of the present invention

[0035] This embodiment takes the following quartz ore A-Madagascar quartz ore, B-Jiangsu Donghai quartz ore, C-Hunan Huayuan quartz ore, D-Hubei Macheng quartz ore, E-Henan Dengfeng quartz ore as an example to illustrate the experiment. Quartz ore will not be repeated here.

[0036] Detect the impurity content of quartz ores from different origins, and record the data in Table 1; detect the gas-liquid inclusion content of quartz ores from different origins, and record the data in Table 2; , sorting, calcining, and sieving to obtain high-purity quartz sand, the particle size of which is controlled at 0.178-1.43 mm;

[0037] Table 1 Quartz ore impurity content (unit: PPM)

[0038] sample

Al

Fe

Ca

Mg

B

Li

Na

K

mn

Ni

Cu

Cr

A

16.82

2.25

0.63

2.5

<0.05

0.14

6.14

5.41

0.25

<...

Embodiment 2

[0048] This example uses Madagascar quartz sand to illustrate the experimental results of the process conditions of the present invention for removing gas-liquid inclusions in high-purity quartz sand.

[0049] Microwave radiation experiment

[0050] Use 1000w microwave power to irradiate the quartz sample for 30 minutes, and the sample temperature can reach about 550°C. The quartz sand before and after microwave irradiation is compared by infrared, and the results are shown in Image 6 with Figure 7 As shown, it shows that after 1000w microwave treatment, the infrared absorption peak intensity and area of ​​water molecules in the sample without microwave treatment increased significantly, and the infrared spectrum intensity increased to a greater extent, indicating that new water molecules were generated. Research shows that newly formed water molecules originate from hydroxyl water (OH) in the crystal lattice - .

[0051] Depend on Figure 8 It can be seen that there are...

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Abstract

The invention relates to the technical field of purification of high-purity quartz sand and discloses a process method for removing a gas-liquid inclusion in the high-purity quartz sand. The process method comprises the following step: performing microwave radiation treatment on the high-purity quartz sand for 1 to 10h, wherein the microwave power is 1,000 to 4,000w, and the one-time treatment amount of the high-purity quartz sand is 100 to 600g. The process method for removing a gas-liquid inclusion in the high-purity quartz sand is simple and easy to operate, environment-friendly, safe, and good in removal effect; exhausted natural crystal resources can be possibly replaced by common quartz ores, and the high-purity quartz sand in which the content of the gas-liquid inclusion is over an order of magnitude lower than that of the gas-liquid inclusion in the natural crystal can also be produced; the method makes a great contribution to updating and upgrading of raw materials of quartz glass.

Description

technical field [0001] The invention relates to the technical field of purification of high-purity quartz sand, and more specifically, relates to a process method for removing gas-liquid inclusions in high-purity quartz sand. Background technique [0002] Quartz glass is a single component SiO 2 Special high-grade glass with excellent chemical stability, high infrared spectral transmittance, strong impact resistance, high temperature resistance (above 1800 degrees Celsius) without deformation, resistance to X-ray radiation, excellent electrical insulation and other physical and chemical properties . Widely used in polysilicon production, optical power supply, electronics industry, optical communication, medical equipment, SiO 2 Thin film materials, large-scale integrated circuits, lasers, aerospace, military industries, etc. provide cutting-edge materials, which are indispensable in high technology. [0003] In the middle of the last century, people used natural crystals ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C1/02
Inventor 侯熠徽刘平乐侯清麟
Owner XIANGTAN UNIV
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