Method for preparing water glass by utilizing waste lead-containing glass and separating lead-containing compound

A technology for waste lead-containing glass and water glass, applied in the directions of lead sulfide, alkali metal silicate, silicate, etc., can solve problems such as lead waste, achieve recycling, solve the problem of refractory degradation, and cure pollution.

Active Publication Date: 2012-12-19
TIANJIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

At the same time, the lead contained in the waste CRT leaded glass is also wasted

Method used

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  • Method for preparing water glass by utilizing waste lead-containing glass and separating lead-containing compound

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Embodiment 1

[0020] A method for preparing water glass from waste lead-containing glass and separating lead-containing compounds. First, the lead-containing glass of the waste cathode ray tube is made into water glass frit, then the frit is hydrolyzed, and the hydrolyzate is separated from the hydrolyzate. Obtain the water glass solution, then add additives to convert the lead dissolved in the water glass into lead sulfide, separate and collect the lead sulfide precipitate, obtain lead-free potassium or sodium water glass solution, and further process the dissolved residue to make it The lead-containing compound is converted into lead sulfide, and the lead sulfide in the hydrolysis slag is recovered by the flotation method. The process flow is shown in the attached drawing.

[0021] The method for producing potassium water glass and separating lead-containing compound with waste lead-containing glass, the steps are as follows:

[0022] 1) Preparation of frit: crush the waste CRT lead-conta...

Embodiment 2

[0031] The method for preparing sodium water glass and separating lead-containing compound with waste lead-containing glass, the steps are as follows:

[0032] 1) Preparation of frit: crush waste CRT lead-containing glass, particle size ≤ 50 mm, take 1000 kg of crushed material and add 250 kg of sodium carbonate, mix well and put it in a melting furnace, melt and react at 1100 ° C for 2 hours, the reaction product After cooling, it becomes a frit, and after cooling to normal temperature, the material is pulverized to obtain a frit pulverized material with a particle size of ≦10 mm;

[0033] 2) Hydrolysis reaction: Put the above pulverized materials into a reaction kettle, add 2550 kg of water, and carry out hydrolysis reaction at a temperature of 200°C, a pressure of 1.5MPa, and a stirring speed of 400 rpm, and the reaction time is 0.5 hours , obtain the mixture of liquid phase water glass and residue precipitate;

[0034] 3) Separation and extraction of water glass: After th...

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Abstract

The invention relates to a method for preparing water glass by utilizing waste lead-containing glass and separating a lead-containing compound. The method comprises the following steps of: firstly, making the lead-containing glass of an abandoned cathode-ray tube (CRT) into water glass fusion cake, hydrolyzing the fusion cake, and separating hydrolysate to obtain a water glass solution; then adding an additive to convert lead dissolved in the water glass into lead sulphide, separating and collecting lead sulphide sediment to obtain a lead-free potassium or sodium water glass solution, further treating dissolved residue to convert the lead-containing compound in the residue into lead sulphide, and recycling lead sulphide in the hydrolysis residue by adopting a floatation method. The method disclosed by the invention has the advantages that silicon, potassium and sodium ingredients in the lead-containing glass of the abandoned CRT can be converted into the water glass, recycling of the lead-containing compound is solved; the water glass is a basic inorganic chemical industry product with wide application range; and recycling of the lead-containing compound is solved, the recycled lead-containing compound can be taken as a raw material for lead smelting, and recycling of lead resource is realized.

Description

【Technical field】 [0001] The invention relates to resource utilization and pollution control technology of waste lead-containing glass, in particular to a method for preparing water glass from waste lead-containing glass and separating lead-containing compounds. 【Background technique】 [0002] The picture tube used in the color display of TV and computer belongs to the cathode ray tube (CRT). In order to prevent the picture tube from radiating harmful X-rays to the environment during operation, lead oxide or lead silicate is usually added to the cone glass of the glass bulb. Due to the advancement of display technology, a large number of flat panel display technologies are used, and CRT display technology is gradually withdrawn from use. A large amount of lead-containing glass (hereinafter referred to as waste CRT lead-containing glass) will be produced due to the discarding of a large number of TV sets and computers using CRT monitors. Studies have shown that long-term con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/32C01G21/21
Inventor 胡彪汤桂兰孟辰晨冯炘胡肇源王素凤
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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