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Preparation method of high-purity low-hydroxyl quartz glass raw material

A technology of quartz glass and high-purity quartz sand, applied in glass manufacturing equipment, glass molding, glass furnace equipment, etc., can solve problems such as limited dehydration effect, difficult rework, and restrictions on the production of high-quality quartz glass and products

Active Publication Date: 2020-07-10
HUANGGANG NORMAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High-temperature and high-vacuum methods are usually used to remove hydroxyl groups, but the effect of high-temperature vacuum treatment is limited. If the quartz glass product is still not marked after dehydroxylation treatment, it is difficult to rework, and it will generally be scrapped directly, which greatly limits high-quality products. Production of quartz glass and its products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Using vein quartz with a purity of 99.98% in a certain place in Henan as raw material, the fused silica material is prepared according to the patent number 201310440921.5, patent name: a low-cost, continuous production method of high-purity fused silica material and the method in the device, as the starting material for this example. Detection of SiO in the obtained fused silica material 2 The purity is 99.99%, and the hydroxyl content is 50ppm.

[0029] The above starting materials were processed as follows:

[0030] 1. First crush the initial raw materials, and then use an iron sand making machine to make wet sand. The prepared mortar is magnetically separated by a 1.8T electromagnetic separator, and then graded with a water sieve to collect 40-70 mesh, 70- 120 mesh, 120-200 mesh mortar, dehydrated for later use.

[0031] 2. Send the sand powder in different mesh ranges to the corresponding high-purity quartz sand pickling purification device (ZL201110247061.4) and...

Embodiment 2

[0035] Using the waste quartz glass crucible after drawing single crystal silicon as the initial raw material, SiO in the quartz glass crucible 2 Purity: 99.998%, hydroxyl content is 10ppm.

[0036] The above starting materials were processed as follows:

[0037] 1. First break the quartz glass crucible and wash it with tap water, use an iron sand making machine for wet sand making, and use a 2.2T electromagnetic separator for magnetic separation of the prepared mortar, and then use a water screen for the slurry after magnetic separation Collect 40-70 mesh, 70-120 mesh, 120-200 mesh, 200-300 mesh mortar by classification, and dehydrate it for later use.

[0038] 2. Send the sand powder in different mesh intervals to the corresponding quartz sand pickling purification device (ZL201310279400.6) and use 3% HF+5% HNO 3 The mixed acid solution formed was purified by dynamic pickling at 90°C for 3 hours, then the acid solution was removed, then washed with tap water until neutral,...

Embodiment 3

[0042] Using waste quartz glass ingots as initial raw materials, SiO in said quartz glass ingots 2 The purity is 99.996%, and the hydroxyl content is 300ppm.

[0043] The above starting materials were processed as follows:

[0044] 1. After the quartz glass ingot is broken manually, washed and dried, the iron sand making machine is used for wet sand making, and the prepared mortar is magnetically separated by an electromagnetic separator with a magnetic field strength of 3.0T, and then sieved with water. Classification, the slurry after magnetic separation is then classified by water sieve to collect 40-70 mesh, 70-120 mesh, 120-200 mesh mortar, and dehydrated for later use.

[0045] 2. Send the sand powder in different mesh intervals to the corresponding quartz sand pickling purification device (ZL201310279400.6) and use 5%HF+10%H 2 C 2 o 4 The mixed acid solution formed was dynamically pickled and purified at a temperature of 98°C for 3 hours to remove the acid solution,...

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Abstract

The invention relates to a preparation method of a high-purity low-hydroxyl quartz glass raw material, and the method comprises the following steps: by using high-purity quartz sand melted quartz glass or recovered quartz glass products as an initial raw material, carrying out dehydroxylation treatment on the initial raw material in a high-temperature high-vacuum environment after sand making to finally obtain the high-purity low-hydroxyl quartz glass raw material. The prepared quartz glass raw material sand powder has the characteristics of high purity, high transparency, low hydroxyl and nobubbles, can greatly improve the percent of pass of quartz glass products, reduces the production cost of enterprises, and improves the economic benefits of the enterprises.

Description

technical field [0001] The invention relates to a preparation method of a high-purity, low-hydroxyl quartz glass raw material, which belongs to the deep processing industry of non-metallic ore. Background technique [0002] "Transparent quartz glass tubes for semiconductors" JC / T597-2011 stipulates that the hydroxyl content should be less than or equal to 220×10 -6 ; "Transparent Quartz Glass Rods for Semiconductors" JC / T2064-2011 stipulates that the hydroxyl content should be less than or equal to 220×10 -6 ; "Transparent quartz glass tubes for electric light sources" JC / T598-2007 stipulates: a) High-pressure mercury lamp tubes: the hydroxyl content is less than or equal to 10×10 -6 ; b) The hydroxyl content of the metal halide lamp tube is less than or equal to 3×10 -6 ; c) Halogen tungsten lamps, quartz glass tubes for other lamps: agreed upon by both parties. [0003] Transparent quartz glass and its products are made of high-purity quartz sand powder, which is melted...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C1/02C03B5/16C03B20/00
CPCC03C1/022C03C1/024C03B5/16C03B20/00
Inventor 田辉明田正芳黄林勇陈中文江军民雷绍民
Owner HUANGGANG NORMAL UNIV
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