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Method for recovering metal lead from waste lead-containing glass and producing water glass

A technology of waste lead-containing glass and metal lead, applied in the direction of alkali metal silicate, process efficiency improvement, silicate, etc., can solve the problems of waste lead-containing glass heavy metal pollution, etc., achieve full component utilization, easy Effects of implementation and recycling solutions

Inactive Publication Date: 2016-11-30
TIANJIN UNIVERSITY OF TECHNOLOGY +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a method for recovering metal lead from waste lead-containing glass and producing water glass for the above-mentioned technical analysis. Heavy Metal Pollution of Lead Glass

Method used

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Effect test

Embodiment 1

[0028] A method for recovering metallic lead and producing water glass from waste lead-containing glass, the steps are as follows:

[0029] 1) Reactive reduction of lead

[0030] Add 1,000 kg of waste lead-containing glass with a particle size of ≤10 mm, 50 kg of returned lead sulfide, 354 kg of sodium carbonate, 35 kg of coke powder and 80 kg of industrial sodium sulfide with a content of 60 wt% into the furnace, and melt and react under a reducing atmosphere at 1050°C After 2.5 hours, the metal lead produced by the reaction sinks into the lower part of the slag, and the metal lead liquid is discharged from the bottom of the furnace at the melting temperature to recycle and separate the metal lead, and then the slag is discharged outside the furnace for collection;

[0031] 2) Slag hydrolysis

[0032] Crush the slag collected above to a particle size of less than 5 mm, then add it and water into the reactor for hydrolysis, the weight ratio of slag to water is 1:2, the hydrol...

Embodiment 2

[0049] A method for recovering metallic lead and producing water glass from waste lead-containing glass, the steps are as follows:

[0050] 1) Reactive reduction of lead

[0051] Put 1,000 kg of waste lead-containing glass with a particle size of ≤10 mm, 461.5 kg of potassium carbonate, 35 kg of coke powder, and 67.8 kg of potassium sulfide into the furnace, melt and react for 2.5 hours under a reducing atmosphere at 1050°C, and the metal lead produced by the reaction sinks into the melting furnace. In the lower part of the slag, the metal lead liquid is discharged from the bottom of the furnace at the melting temperature and the metal lead is recovered and separated, and then the molten slag is discharged out of the furnace for collection;

[0052] 2) Slag hydrolysis

[0053] Crush the slag collected above to a particle size of less than 5 mm, then add it and water into the reactor for hydrolysis, the weight ratio of slag to water is 1:2, the hydrolysis conditions are temperat...

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Abstract

The invention relates to a method for recovering metal lead from waste lead-containing glass and producing water glass. The method comprises: placing waste lead-containing glass, a flux, a reducing agent and a catalyst into a high-temperature reaction furnace according to a certain ratio, and carrying out a reaction to reduce out lead while produce molten residue; hydrolyzing the molten residue, and separating to obtain a hydrolyzing liquid and dissolving residue; adding a precipitant to the hydrolyzing liquid to precipitate out lead sulfide and obtain crude water glass; adding an acid solvent to the dissolving residue to neutralize; carrying out dissolving washing on the obtained acid dissolving residue by using the crude water glass again, and separating and recovering the final crude water glass and generating the tailing residue; adding a precipitant and a desulfurizing agent to the final crude water glass to prepare the refined water glass, and recovering the precipitated lead sulfide; and washing the tailing residue, and carrying out acid dissolving treatment again. According to the present invention, with the method, the metal lead can be recovered from the waste lead glass and the water glass can be produced; and the process is simple and is easy to performed, the solid waste emission does not exist, the utilization of the whole components of the lead-containing glass waste is achieved, and the economic benefits are significant.

Description

technical field [0001] The invention relates to a technology for resource utilization of waste lead-containing glass in the field of resource recycling, in particular to a method for recovering metallic lead from waste lead-containing glass and preparing water glass. Background technique [0002] Waste leaded glass mainly comes from electronic glass such as cathode ray tubes (CRT) and fluorescent tubes in scrapped color TV sets and color computer monitors. Taking typical waste CRT leaded glass as an example, it contains about 22% lead oxide. Waste lead-containing glass belongs to hazardous waste. For example, lead in waste lead-containing glass dissolves and infiltrates into soil and groundwater, which will cause serious heavy metal pollution. On the other hand, waste lead-containing glass also contains a large amount of lead resources, which is one of the most important energy metals and is widely used in the field of lead-acid battery manufacturing; at the same time, waste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B13/02C01B33/32
CPCC01B33/32C22B13/025Y02P10/20
Inventor 胡彪汤桂兰张书豪王素凤
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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