Waste cathode-ray tube cone glass machinery activation wet-process sulphur treatment method

A mechanical activation and vulcanization technology, applied in the direction of improving process efficiency, can solve problems such as high energy consumption and complex equipment, and achieve the effect of high activation efficiency, wide application and mature process technology.

Inactive Publication Date: 2012-08-22
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The high-temperature reduction method has problems such as high energy consumption and complicated equipment. Therefore, the metal lead recovery

Method used

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  • Waste cathode-ray tube cone glass machinery activation wet-process sulphur treatment method
  • Waste cathode-ray tube cone glass machinery activation wet-process sulphur treatment method

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0020] Example 1

[0021] Take 4g of the crushed waste cathode ray tube cone glass and add it to the planetary high-energy ball mill ball milling tank. The filling ratio of the ball milling medium (zirconia) and the CRT cone glass particles is 20:1, the mechanical ball milling speed is 500rpm, and the mechanical activation time is 2 hours. Obtain mechanically activated CRT cone glass powder.

[0022] The water, CRT cone glass powder and elemental sulfur powder were added to the autoclave at a mass ratio of 100:30:1, the pressure of the reactor was 12MPa, and the solid-liquid reaction was carried out under mechanical stirring at 300°C for 2 hours. After the above-mentioned leaching reaction is completed, filtration is performed to realize solid-liquid separation of the mixed liquid.

[0023] After analysis, the sulfidation rate of metallic lead in CRT cone glass is 26.2%.

Example Embodiment

[0024] Example 2

[0025] Take 4g of the crushed waste cathode ray tube cone glass and add it to the planetary high-energy ball mill ball milling tank. The filling ratio of the ball milling medium (zirconia) and the CRT cone glass particles is 20:1, the mechanical ball milling speed is 500rpm, and the mechanical activation time is 2 hours. Obtain mechanically activated CRT cone glass powder.

[0026] The water, CRT cone glass powder and elemental sulfur powder were added to the autoclave at a mass ratio of 300:10:1, the pressure of the reactor was 6MPa, and the solid-liquid reaction was carried out at 220°C for 2 hours under mechanical stirring conditions. After the above-mentioned leaching reaction is completed, filtration is performed to realize solid-liquid separation of the mixed liquid.

[0027] After analysis, the sulfidation rate of metallic lead in CRT cone glass is 64.9%.

Example Embodiment

[0028] Example 3

[0029] Take 4g of the crushed waste cathode ray tube cone glass and add it to the planetary high-energy ball mill ball milling tank. The filling ratio of the ball milling medium (zirconia) and the CRT cone glass particles is 20:1, the mechanical ball milling speed is 500rpm, and the mechanical activation time is 2 hours. Obtain mechanically activated CRT cone glass powder.

[0030] Water, CRT cone glass powder and elemental sulfur powder were added to the autoclave at a mass ratio of 100:30:1, the pressure of the reactor was 1MPa, and the solid-liquid reaction was carried out at 300°C for 2 hours under mechanical stirring conditions. After the above-mentioned leaching reaction is completed, filtration is performed to realize solid-liquid separation of the mixed liquid.

[0031] After analysis, the sulfurization rate of metallic lead in CRT cone glass is 88.9%.

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PUM

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Abstract

The invention relates to a waste cathode-ray tube (CRT) cone glass machinery activation wet-process sulphur treatment method, which comprises coarsely crushing waste CRT cone glass to obtain CRT cone glass particles with the grain size of 0.1-1.0mm, enabling the cone glass particles after coarse crushing to conduct mechanical activation through a high-energy ball-milling machine to obtain activated CRT cone glass powder; then enabling a certain a mount of activated CRT cone glass, elemental sulfur powder and water to be added in a high pressure reactor to conduct wet-process vulcanization reaction by heating, enabling heavy metal lead in the CRT cone glass to be converted into lead sulfide crystals; and finally conducting filtering separation on a sample after the vulcanization reaction, and conducting flotation separation on a solid mixture after filtration to obtain high grade lead sulfide and solid residues. The waste cathode-ray tube cone glass machinery activation wet-process sulphur treatment method is free of use of acid solution and aqueous alkali, is combined with a traditional vulcanization process, is strong in adaptability to industrial production, and can achieve high-efficient recovery of heavy metal lead in the CRT cone glass.

Description

technical field [0001] The invention relates to the technical field of electronic waste treatment, in particular to a waste cathode ray tube cone glass mechanically activated wet vulcanization treatment method. Background technique [0002] The most harmful and large amount of electronic waste should be cathode ray tube (CRT) glass. There are about 550 million TV sets in my country, the vast majority of which are CRT TV sets, and the number of computer CRT monitors has exceeded 40 million sets, and a large number of electrical and electronic products have reached the peak of elimination and scrapping. The CRT glass bulb is an important part of the display, accounting for about 60% of the total mass. CRT glass bulbs are mainly divided into screen glass, cone glass and neck glass. Cone glass is a leaded glass that contains about 20% lead. CRT cone glass has the characteristics of environmental hazards and resource characteristics. It is estimated that CRT cone glass contain...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B13/00
CPCY02P10/20
Inventor 李金惠苑文仪
Owner TSINGHUA UNIV
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