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A process for producing quartz sand powder for tft-lcd substrate glass using quartz tailings

A technology of quartz tailings and quartz sand powder, which is applied in the direction of silica, silicon oxide, etc., can solve the problem of not finding patent literature reports on quartz sand powder for TFT-LCD substrate glass

Active Publication Date: 2017-02-22
田辉明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Query related patents and literature, but no patent literature report on the use of quartz tailings to produce quartz sand powder for TFT-LCD substrate glass was found

Method used

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  • A process for producing quartz sand powder for tft-lcd substrate glass using quartz tailings
  • A process for producing quartz sand powder for tft-lcd substrate glass using quartz tailings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The raw material in this example is the white tailings in the process of producing quartz sand from vein quartz ore produced by Tangshan Jinxin Shida Silicon Industry Co., Ltd. The specific production process is as follows:

[0026] 1. Rinse the quartz tailings with clean water first, then centrifuge and dehydrate, and detect the impurities in it: Al 2 o 3 : 0.16%, Fe 2 o 3 : 0.053%, K 2 O: 0.02%, Na 2 O: 0.01%; Moisture: 5.6%

[0027] 2. Surface cleaning and impurity removal

[0028] Put the quartz tailings in step 1 into the reaction kettle, first turn on the acid mist absorption tower system, so that the whole reaction system is in a state of slight negative pressure, then turn on the jacket cooling water of the kettle and the condenser cooling water, and then turn on the acid mist absorption tower system. Pump, use a frequency converter to control the amount of hydrofluoric acid sent into the kettle. The concentration of hydrofluoric acid is 10% (depending on ...

Embodiment 2

[0033] The raw material in this example is the yellow tailing sand in the process of producing quartz sand from sedimentary quartzite produced by a silica sand Co., Ltd. in Yishui, Linyi. The specific production process is as follows:

[0034] 1. Since the tailings are long-term stacked tailings, the quartz tailings are beaten first, rinsed with clean water, and then centrifugally dehydrated to detect impurities: Al 2 o 3 : 0.94%, Fe 2 o 3 : 0.15%, K 2 O: 0.02%, Na 2 O: 0.36%; Moisture: 6.3%

[0035] 2. Surface cleaning and impurity removal

[0036] Put the quartz tailings in step 1 into the reaction kettle, first turn on the acid mist absorption tower system, so that the whole reaction system is in a state of slight negative pressure, then turn on the jacket cooling water of the kettle and the condenser cooling water, and then turn on the acid mist absorption tower system. Pump, use a frequency converter to control the amount of hydrofluoric acid sent into the kettle. T...

Embodiment 3

[0041] The raw material in this example is light white tailing sand in the process of producing quartz sand from sedimentary quartzite produced by a silica sand technology Co., Ltd. in Fengyang, Anhui. The specific production process is as follows:

[0042] 1. Since the sand powder is dry sand powder, the impurities in it are directly detected: Al 2 o 3 : 2.44%, Fe 2 o 3 : 0.058%, K 2 O: 0.13%, Na 2 O: 0.01%; Moisture: 4.3%.

[0043] 2. Surface cleaning and impurity removal

[0044] Put the quartz tailings in step 1 into the reaction kettle, first turn on the acid mist absorption tower system, so that the whole reaction system is in a state of slight negative pressure, then turn on the jacket cooling water of the kettle and the condenser cooling water, and then turn on the acid mist absorption tower system. Pump, use a frequency converter to control the amount of fluosilicic acid sent into the kettle, the concentration of fluosilicic acid is 30% (depending on the situati...

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Abstract

The invention provides a process for producing quartz sand powder for TFT-LCD (thin film transistor-liquid crystal display) base plate glass by utilizing quartz tail sand. The method comprises the following steps that firstly, the content of impurities in the quartz tail sand is tested, and the acid washing treatment is carried out according to the content of Al2O3 in the quartz tail sand; materials subjected to acid washing are put into a reaction kettle, and any two kinds of mixed acid liquid from hydrochloric acid, nitric acid and fluosilicic acid are used for carry out acid washing to dissolve and remove iron in the materials; the quartz tail sand subjected to iron removal is washed by water to the neutral state and is then dehydrated, 160 to 300 meshes of quartz sand powder is separated out, and the quartz sand powder for TFT-LCD base plate glass can be prepared. The method has the advantages that the quartz tail sand can be effectively utilized, the quartz tail sand can be produced into high-additional-value quartz sand powder for the TFT-LCD base plate glass, and the goal of changing waste into valuables is achieved. The invention also provides a device used for the process.

Description

technical field [0001] The invention relates to a method and a special device for producing quartz sand powder for TFT-LCD substrate glass by utilizing quartz tailings, belonging to the technical field of non-metallic ore deep processing and environmental protection. Background technique [0002] Quartz tailing sand: As the name suggests, it is the shortest or last sand powder in the process of quartz sand processing and production, and it is also a by-product. At present, the mesh size of tailings produced by quartz sand processing enterprises in my country is mostly in the range of below 120 mesh sieves to above 400 mesh sieves. The annual output of quartz sand tailings is tens of millions of tons, mainly distributed in Fengyang, Anhui, Heyuan, Guangdong, Linyi in Shandong, Shahe and Leizhuang in Hebei, etc. Compared with the finished quartz sand (from 24 mesh sieve to 120 mesh sieve), quartz tailings not only have small particle size, large specific surface area, large su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/12
Inventor 田辉明
Owner 田辉明