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A Mechanochemical Vulcanization Treatment Method for Waste CRT Cone Glass

A mechanochemical and vulcanization treatment technology, which is applied in the direction of grain treatment, lead halide, process efficiency improvement, etc., can solve the problems of difficult to realize industrialization and inapplicability, and achieve the effect of high vulcanization efficiency, wide application and mature process technology

Active Publication Date: 2017-05-31
SHANGHAI SECOND POLYTECHNIC UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] There are many methods for extracting lead from CRT cone glass, such as subcritical method, pyrometallurgy method, high temperature reduction method and chloride salt roasting volatilization method, etc., but there are many technical bottlenecks and environmental problems, and it is difficult to realize industrialization
Hydrometallurgy has the advantages of low processing cost and mature technology, but for CRT cone glass, lead exists in the cone glass network structure, which has strong chemical stability, and traditional hydrometallurgy methods are not suitable for it

Method used

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  • A Mechanochemical Vulcanization Treatment Method for Waste CRT Cone Glass

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 4 grams of waste cathode ray tube cone glass and sodium sulfide compound (according to the molar ratio of lead in the cone glass to sulfur in the vulcanizing agent 1:1.2) into the planetary ball mill ball mill jar, and then add stainless steel balls to the ball mill jar (where 24 pieces of Φ 9.6mm, 100 pieces of Φ5.6mm stainless steel grinding balls), the mass ratio of material to grinding balls is 1:80, and then filled with nitrogen or helium to maintain an inert environment and seal. Set the rotational speed of the ball mill to 250 rpm, the ball milling time to 1 hour, the ball milling mode to run for 15 minutes, stop for 15 minutes, and cycle in turn. After the mechanochemical ball milling reaction, samples were taken to analyze and test the vulcanization rate of lead in the cone glass.

[0021] After analysis, the sulfuration rate of metal lead in the CRT cone glass is 62%.

Embodiment 2

[0023] Add 4 grams of waste cathode ray tube cone glass and sodium sulfide mixture (according to the molar ratio of lead in the cone glass to sulfur in the vulcanizing agent 1:1.2) into the ball mill jar of the planetary ball mill, and then add stainless steel balls (24 of them) to the ball mill jar Φ9.6mm, 100 Φ5.6mm stainless steel grinding balls), the mass ratio of material to grinding balls is 1:80, and then filled with nitrogen or helium to maintain an inert environment and seal. Set the rotating speed of the ball mill to 550 rpm, the ball milling time to 2 hours, the ball milling mode to run for 15 minutes, stop for 15 minutes, and then cycle in turn. After the mechanochemical ball milling reaction, samples were taken to analyze and test the vulcanization rate of lead in the cone glass.

[0024] After analysis, the sulfuration rate of metal lead in the CRT cone glass is 73%.

Embodiment 3

[0026] Add 4 grams of waste cathode ray tube cone glass and vulcanizing agent mixture (according to the molar ratio of lead in the cone glass to sulfur in the vulcanizing agent 1:2.0) into the ball milling tank of the planetary ball mill, and then add stainless steel balls (of which 24 Φ9.6mm, 100 Φ5.6mm stainless steel grinding balls), the mass ratio of material to grinding balls is 1:80, and then filled with nitrogen or helium to maintain an inert environment and seal. Set the rotational speed of the ball mill to 550 rpm, the milling time to 1 hour, the ball milling mode to run for 15 minutes, stop for 15 minutes, and then cycle in turn. After the mechanochemical ball milling reaction, samples were taken to analyze and test the vulcanization rate of lead in the cone glass.

[0027] After analysis, the sulfuration rate of metal lead in the CRT cone glass is 91%.

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Abstract

The invention belongs to the technical field of electronic waste treatment, and particularly relates to a mechanical and chemical vulcanization treatment method of waste cathode ray tube cone glass. The mechanical and chemical vulcanization treatment method comprises the following steps: firstly, roughly crushing the waste CRT cone glass by using a crusher to obtain CRT cone glass granules with the granule size of 0.1-1.0 mm; secondly, putting the roughly-crushed cone glass granules, a vulcanizing agent (such as sodium sulfide) and stainless steel milling balls according to certain proportions into a mechanical and chemical reactor (a ball milling jar) for mechanical and chemical reaction; thirdly, dissolving and leaching a ball-milled product after the mechanical and chemical reaction by using a ferric trichloride solution at a certain concentration; finally, cryogenically cooling leachate, and separating out lead chloride crystals to achieve resource recycle of metal lead in the CRT cone glass. According to the mechanical and chemical vulcanization treatment method, an acid leaching solution and an alkali leaching solution are not used and environment pollution is avoided; the mechanical and chemical vulcanization treatment method can be applicable to harmless treatment of other lead-containing glass or lead-containing wastes.

Description

technical field [0001] The invention relates to the technical field of electronic waste treatment, in particular to a mechanochemical vulcanization treatment method for waste cathode ray tube cone glass. Background technique [0002] With the continuous improvement of people's living standards and the acceleration of electronic product renewal, the generation of electronic waste has increased sharply. The treatment and disposal of electronic waste has become a hot spot of global concern, especially the treatment and disposal of lead-containing glass. Leaded glass in e-waste mainly comes from waste cathode ray tube displays. CRTs are widely used in major display devices such as televisions, computer monitors, and oscilloscopes. CRT glass bulb is an important part of the display, accounting for about 60% of the total mass, mainly screen glass and cone glass. The lead content of CRT cone glass is as high as 22-28%, and the lead content in the average display is about 1.2Kg. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B02C17/08C22B13/00C22B7/00C01G21/16
CPCB02C17/08C01G21/16C22B13/025C22B13/045Y02P10/20
Inventor 苑文仪黄晨沈燕军张承龙王景伟白建峰
Owner SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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