Method for treating waste cathode ray tube (CRT) cone glass by strengthening acid leaching through mechanical activation technology

A technology of mechanical activation and acid leaching treatment, applied in the direction of silicon oxide, silicon dioxide, process efficiency improvement, etc., can solve the problems of high back-end treatment costs, high energy consumption, large amount of waste residue, etc., and achieve easy large-scale industrialization The effect of mature production and process technology and high activation efficiency

Inactive Publication Date: 2012-09-12
TSINGHUA UNIV
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AI Technical Summary

Problems solved by technology

In the process of pyrometallurgy, CRT cone glass is used instead of ore sand as a flux and put into the lead smelting furnace to realize the separation of metal and glass. However, this method has problems such as large amount of waste residue, high energy consumption, and high back-end processing costs.
The high-temperature reduction method has problems such as high energy consumption and complicated equipment
Hydrometallurgy has the advantages of low processing cost, simple operation process, and high metal recovery rate. However, for CRT cone glass, lead exists in the cone glass network structure and has strong chemical stability. Traditional hydrometallurgy methods are not suitable for it.

Method used

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  • Method for treating waste cathode ray tube (CRT) cone glass by strengthening acid leaching through mechanical activation technology
  • Method for treating waste cathode ray tube (CRT) cone glass by strengthening acid leaching through mechanical activation technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] First, the cone glass separated by the CRT cone screen is roughly crushed to obtain cone glass particles with a particle size of about 0.1mm;

[0021] Get 4g of waste cathode ray tube cone glass after coarse crushing and join in the ball milling jar of planetary high-energy ball mill, the filling ratio of ball milling medium (zirconia) and CRT cone glass particles is 20:1, the mechanical ball milling speed is 300rpm, and the activation time is 30min to obtain mechanical Activated CRT cone glass powder.

[0022] Place the mechanically activated CRT cone glass powder sample in a 70°C, 3.0mol / L nitric acid solution with a liquid-solid ratio of 25:1mL / g, and mechanically stir for 120min. After the above-mentioned leaching reaction is completed, filter while hot to realize solid-liquid separation of the mixed liquid.

[0023] The recovery rate of metallic lead in the CRT cone glass was 19.7% after analysis.

Embodiment 2

[0025] First, the cone glass separated by the CRT cone screen is roughly crushed to obtain cone glass particles with a particle size of about 0.2mm;

[0026] Get 4g of waste cathode ray tube cone glass after coarse crushing and join in the ball milling jar of planetary high-energy ball mill, the filling ratio of ball milling medium (zirconia) and CRT cone glass particles is 20:1, the mechanical ball milling speed is 400rpm, and the activation time is 60min to obtain mechanical Activated CRT cone glass powder.

[0027] Place the mechanically activated CRT funnel glass powder sample in 90°C, 2.0mol / L nitric acid solution with a liquid-solid ratio of 25:1mL / g, and react with mechanical stirring for 30min. After the above-mentioned leaching reaction is completed, filter while hot to realize solid-liquid separation of the mixed liquid.

[0028] The recovery rate of metallic lead in the CRT cone glass was 61.9% after analysis.

Embodiment 3

[0030] First, the cone glass separated by the CRT cone screen is roughly crushed to obtain cone glass particles with a particle size of about 0.5mm;

[0031] Get 4g of waste cathode ray tube cone glass after coarse crushing and join in the ball milling tank of planetary high-energy ball mill, the filling ratio of ball milling medium (zirconia) and CRT cone glass particles is 20:1, the mechanical ball milling speed is 500rpm, and the activation time is 120min to obtain mechanical Activated CRT cone glass powder.

[0032] The mechanically activated CRT cone glass powder sample was placed in 95°C, 1.0mol / L nitric acid solution, the liquid-solid ratio was 150:1mL / g, and the reaction was mechanically stirred for 60min. After the above-mentioned leaching reaction is completed, filter while hot to realize solid-liquid separation of the mixed liquid.

[0033] The recovery rate of metal lead in the CRT cone glass was 92.5% after analysis.

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Abstract

The invention relates to a method for treating waste cathode ray tube (CRT) cone glass by strengthening acid leaching through a mechanical activation technology. Waste CRT cone glass is coarsely crushed to obtain cone glass particles with the grain diameters of 0.1 to 1.0 mm, the coarsely-crushed cone glass particles are subject to mechanical activation through a high energy ball mill to obtain activated cone glass powder, then the activated cone glass powder is leached into nitric acid solution with certain concentration, and finally a sample leached into the nitric acid solution to react is filtered and separated to obtain leach residue powder and leach solution containing lead, and the residue powder is high-purity silicon dioxide powder. The method has the advantages of mild reaction condition, simple process flow and high leaching rate of metallic lead in CRT cone glass.

Description

technical field [0001] The invention relates to the technical field of electronic waste treatment, in particular to a method for treating waste cathode ray tube cone glass with mechanical activation and enhanced acid leaching. Background technique [0002] The most harmful and large amount of electronic waste should be cathode ray tube (CRT) glass. The cathode ray tube is the earliest and most widely used display technology in industrial production. It has the advantages of mature technology, high reliability, and long service life. It is used as the main display device for electronic equipment such as televisions, computer monitors, and oscilloscopes. 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 displa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/06C22B13/00C01B33/12
CPCY02P10/20
Inventor 李金惠苑文仪
Owner TSINGHUA UNIV
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