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Method for extracting lead from waste CRT (Cathode Ray Tube) cone glass

A technology of conical glass and broken glass, which is applied in the field of lead extraction, can solve problems such as difficult application and popularization, complex extraction process, and strict equipment conditions, and achieve good industrialization promotion and application value, reduce environmental pollution, and reduce environmental hazards.

Inactive Publication Date: 2012-09-19
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent requires harsh reaction conditions such as high temperature (temperature is 1000°C) and vacuum (system pressure is 10Pa) and supporting production equipment. The extraction process is complicated, the equipment conditions are strict, and the extraction cost is high. Therefore, this technology is difficult. Application and promotion in industry
The Chinese patent (publication number 102051487A) uses strong alkali to destroy the glass network structure under high temperature (450-800°C) melting conditions, and then reduces the freed lead oxide with carbon powder to obtain lead, but this method consumes a lot of energy , and consume a large amount of caustic soda, it is easy to cause secondary pollution

Method used

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  • Method for extracting lead from waste CRT (Cathode Ray Tube) cone glass
  • Method for extracting lead from waste CRT (Cathode Ray Tube) cone glass
  • Method for extracting lead from waste CRT (Cathode Ray Tube) cone glass

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Experimental program
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Effect test

Embodiment 1

[0025] Remove the inner and outer surface coatings of the waste CRT cone glass and dry them. After coarse crushing and fine crushing to 100-200 mesh powder, it is activated by mixing and ball milling with a certain material-ball ratio. The ball milling conditions were set as a material-ball ratio of 1:2, agate balls with a ball diameter of 10 mm, 580 rpm / min, and a ball milling time of 8 h. Finally, the glass powder can be ground to a fineness of 1-10 μm. The activated cone glass powder was dried in a vacuum oven at 105°C for later use. Through XRF analysis, its chemical composition is as follows:

[0026] chemical components Na 2 o al 2 o 3 SiO 2 K 2 o CaO SrO BaO PbO Content (wt%) 7.38 3.27 50.8 8.32 3.89 0.59 0.65 21.7

[0027] Take 20.005g of conical glass powder and 200ml of 1mol / L fluosilicic acid, put them into a Erlenmeyer flask, seal with a silica gel stopper to prevent volatilization of the fluosilicic acid solution...

Embodiment 2

[0031] Still take some of the 100-200 mesh cone glass powder of the above reaction.

[0032] The ball milling conditions were set as material-ball ratio 1:2, ratio of 10 mm agate balls to 3 mm agate balls 1:1, rotational speed 580 rpm / min, ball milling time 12 h. After ball milling, put the ground cone glass powder into a drying oven at 105°C to dry for later use.

[0033] Take 20.008g of conical glass powder and 200ml of 1mol / l fluosilicic acid, put them into an Erlenmeyer flask, heat in a water bath to 90°C, stir at 500 rpm / min, and react for 12 hours.

[0034] After the reaction is complete, vacuum filter the solution after it has cooled down. The leach solution is slowly added to the above-mentioned beaker containing the leach solution with 0.5 mol / L dilute sulfuric acid. After the reaction is complete, let it stand for 1-2 hours. Pour the solution and precipitate in the beaker into a vacuum filter for suction filtration, and repeatedly wash the filter cake with deionized...

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Abstract

The invention relates to a method for extracting lead from waste CRT (Cathode Ray Tube) cone glass, comprising the specific steps of: (A) mechanically and roughly crushing the waste CRT cone glass and then finely crushing the waste CRT cone glass into 100-200 meshes; then mechanically milling for 4-12 hours to obtain a reaction raw material; (B) taking fluosilicic acid as an extracting agent at the temperature of 90-100 DEG C and continuously strengthening and leaching for 4-12 hours; and cooling and filtering to obtain a lead fluorosilicate solution; (C) slowly adding a pre-prepared dilute sulfuric acid solution into the lead fluorosilicate solution to form lead sulfate sediment; adjusting pH (Potential of Hydrogen) to complete precipitate; and (D) cooling and filtering; repeatedly washing a filter cake with de-ionized water for 3-5 times; and drying a white lead sulfate filter cake at 80 DEG C for 2-8 hours in vacuum to obtain a lead sulfate product with a higher purity, wherein the collected filtering solution is a regenerated fluosilicic acid solution and can be recycled and reused. The process does not generate secondary pollution; a waste liquid closed loop is realized in the whole process; and compared with a pyrogenic process lead smelting technology, the method has the advantages of low cost, simple technology and high production addition value.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, in particular to a method for extracting lead from waste CRT cone glass. It is suitable for harmless treatment and resource utilization of waste CRT glass. Background technique [0002] With the replacement of display products, more and more Cathode Ray Tube (CRT) TV sets and computer monitors are being eliminated and entered into the waste stream, making the disposal of waste CRTs a global environmental concern. According to a rough estimate, the current global annual production of Waste Electrical and Electronic Equipment (WEEE) is about 20-25 million tons, of which the annual waste of CRT products accounts for about 20-40% of the total WEEE production. According to the sales data of TV sets and computers released by the National Bureau of Statistics, it is speculated that the social ownership of TV sets in my country exceeds 400 million sets, and most of them are traditional ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B13/00
CPCY02P10/20
Inventor 李光明胥清波贺文智黄菊文
Owner TONGJI UNIV
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