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Method for preparing micro-porous high-silica glass powder with waste CRT screen glass

A technology of high-silica glass and screen glass, which is applied in the field of resource utilization of hazardous solid waste, pollution control and resource utilization of waste barium-strontium-containing CRT screen glass, and can solve the problems of high processing cost, unsuitable industrialized processing, Solve the problems of large alkali consumption, achieve the effects of short processing time, easy large-scale industrial production, and reduce raw material costs

Inactive Publication Date: 2017-12-15
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the alkali fusion method consumes a lot of alkali, resulting in high processing costs, and is not suitable for industrial processing.

Method used

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  • Method for preparing micro-porous high-silica glass powder with waste CRT screen glass
  • Method for preparing micro-porous high-silica glass powder with waste CRT screen glass
  • Method for preparing micro-porous high-silica glass powder with waste CRT screen glass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Remove the fluorescent coating on the surface of the waste CRT screen glass after cone screen separation, use a compound crusher to crush the CRT screen glass into particles with a diameter of 1 mm, and then use a ball mill to grind the CRT screen glass particles into 50 mesh CRT screen glass powder;

[0035] Mix CRT screen glass powder with B 2 o 3 、H 3 BO 3 ,P 2 o 5 Mix evenly with potassium carbonate according to a certain ratio, and use a ball mill to continue crushing to 100 mesh, of which B 2 o 3 、H 3 BO 3 ,P 2 o 5 The mass ratio with potassium carbonate is 65:20:10:5, B 2 o 3 、H 3 BO 3 ,P 2 o 5 and potassium carbonate account for 20% of the total mass of the mixture;

[0036] Put the mixed CRT screen glass powder into the muffle furnace and carry out melting treatment under the air atmosphere of 1000 ℃, and the holding time is 0h;

[0037] The CRT screen glass after high-temperature melting treatment is subjected to phase separation treatment at...

Embodiment 2

[0046] Remove the fluorescent coating on the surface of the waste CRT screen glass after cone screen separation, use a compound crusher to crush the CRT screen glass into particles with a diameter of 3 mm, and then use a ball mill to grind the CRT screen glass particles into 100 mesh CRT screen glass powder;

[0047] Mix CRT screen glass powder with B 2 o 3 、H 3 BO 3 ,P 2 o 5 Mix evenly with potassium carbonate according to a certain ratio, and use a ball mill to continue crushing to 100 mesh, of which B 2 o 3 、H 3 BO 3 ,P 2 o 5 The mass ratio with potassium carbonate is 80:10:5:5, B 2 o 3 、H 3 BO 3 ,P 2 o 5 and potassium carbonate account for 30% of the total mass of the mixture;

[0048] Put the mixed CRT screen glass powder into the muffle furnace and carry out melting treatment under the air atmosphere of 1200 ℃, and the holding time is 1h;

[0049] The CRT screen glass after high-temperature melting treatment is subjected to phase separation treatment at...

Embodiment 3

[0058] Remove the fluorescent coating on the surface of the discarded CRT screen glass after cone-screen separation, use a compound crusher to crush the CRT screen glass into particles with a diameter of 5 mm, and then use a ball mill to grind the CRT screen glass particles into 150 mesh CRT screen glass powder;

[0059] Mix CRT screen glass powder with B 2 o 3 、H 3 BO 3 ,P 2 o 5 Mix evenly with potassium carbonate according to a certain ratio, and use a ball mill to continue crushing to 100 mesh, of which B 2 o 3 、H 3 BO 3 ,P 2 o 5 The mass ratio with potassium carbonate is 70:15:10:5, B 2 o 3 、H 3 BO 3 ,P 2 o 5 and potassium carbonate account for 50% of the total mass of the mixture;

[0060] Put the mixed CRT screen glass powder into the muffle furnace and carry out melting treatment under the air atmosphere of 1400 ℃, and the holding time is 0h;

[0061] The CRT screen glass after high temperature melting treatment is subjected to phase separation treatme...

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Abstract

The invention relates to a method for preparing micro-porous high-silica glass powder with waste CRT screen glass. The method comprises the steps that the waste CRT screen glass is crushed to reach the certain fineness degree, 20%-50% of mixed powder of B2O3, H3BO3, P2O5 and potassium carbonate is added into the screen glass powder, and full mixing is conducted until the mixture is uniform, wherein the mass ratio of B2O3 to H3BO3 to P2O5 to potassium carbonate is (60-80):(10-20):(5-10):(1-10); the mixed powder is smelted for 0-4 h on the condition that the temperature ranges from 1,000 DEG C to 1,500 DEG C; split-phase heat treatment is conducted on a smelted product for 0-24 h on the condition that the temperature ranges from 500 DEG C to 650 DEG C; a massive product is crushed and then subjected to acid leaching. The deviating rate of barium and strontium ranges from 98.00% to 99.60%, the SiO2 content of the high-silica glass powder ranges from 88.85% to 97.20%, and the pore size range of the micro-porous high-silica glass powder is 5-300 nm. Accordingly, the established technological operation is simple, the barium and strontium deviating rate is high, and meanwhile the high-silica glass powder high in economic value can be prepared; therefore, the industrial application prospect is wide.

Description

technical field [0001] The invention relates to a new technology for resource utilization of electronic waste, which belongs to the field of environmental protection and resource comprehensive utilization, and is especially suitable for pollution control and resource utilization of waste barium-strontium-containing CRT screen glass. Background technique [0002] Discarded cathode ray tube (Cathode ray tube CRT) screen glass contains a large amount of heavy metal oxides BaO and SrO (the content range of both is between 9-13wt%). At present, CRT monitors have been eliminated by a large number of advanced display technologies, and a huge amount of discarded CRT screen glass will be produced every year in the world. If the CRT screen glass is not effectively disposed of and recycled, these waste heavy metal-containing barium-strontium glass will occupy a lot of precious land resources in the open air, and random landfill will cause heavy metal pollution in the surrounding soil a...

Claims

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Application Information

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IPC IPC(8): C03C12/00C03C11/00C03C6/02
CPCC03C1/002C03C11/00C03C12/00
Inventor 邢明飞王雅萍麻冰涓黄兴宇杨英傅泽刚王净宇
Owner HENAN POLYTECHNIC UNIV
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