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

A glass and potassium hydroxide technology, applied in the field of extracting lead and extracting lead from waste CRT glass, can solve the problems of unsuitable lead extraction, complex extraction process and high extraction cost, and achieve low lead content and good industrial application. Value, effect of reducing environmental impact

Inactive Publication Date: 2012-09-05
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 complex and the equipment conditions are strict. It is very high, so it is difficult for this technology to be applied and promoted in industry
Chinese patent (CN 101573461A) relates to a method for extracting lead from lead-containing waste, but it is not suitable for the extraction of lead in CRT glass after analysis

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0022] The glass funnel part in the waste CRT glass was crushed, and then ground to a particle size greater than 100 mesh by a ball mill, and dried in a 105°C drying oven for later use. After analysis, its chemical composition is shown in Table 1.

[0023] The sample chemical composition of CRT glass cone in the embodiment 1 of table 1

[0024]

[0025] A Take 10.177g of glass powder, 10.201g of sodium hydroxide and 0.492g of activated carbon and mix them evenly in a nickel crucible, then add 10.042g of sodium hydroxide to cover the above mixture, place it in a resistance furnace for alkali fusion, and set the alkali fusion temperature to 800℃, alkali melting time 20min, natural cooling after melting;

[0026] B added 50ml of hot water to wash the molten material, the lead precipitated on the bottom layer of the molten material, separated the lead grains, put them in a drying oven to dry, and weighed after the drying was complete, the crude lead weighed 1.805g.

[0027] C...

Embodiment 2

[0029] The neck part of the waste CRT glass is crushed, ground with a ball mill, passed through a 100-mesh sieve, and put into a drying oven at 105°C to dry for later use. After analysis, its chemical composition is as shown in Table 2,

[0030] The sample chemical composition of CRT tube neck in the embodiment 2 of table 2

[0031]

[0032] A Take 9.992g of glass powder, 5.156g of potassium hydroxide and 0.212g of activated carbon and mix them evenly in a nickel crucible, then add 10.742g of potassium hydroxide on the above mixture, put it in a resistance furnace for alkali fusion, and set the temperature at 600°C, Alkali melting time is set to 60min, cooling after melting;

[0033] B adds 50ml of hot water to clean the melt, the lead precipitates on the bottom of the melt, separates the lead grains, puts them in a drying oven to dry, and weighs after the drying is complete, the crude lead weighs 2.824g;

[0034] C filter the alkali slag and lye with fast filter paper, s...

Embodiment 3

[0036] The CRT tube neck is still divided into raw materials for testing,

[0037]A Take 9.961g of glass powder, 19.456g of potassium hydroxide and 0.599g of activated carbon and mix them evenly in a nickel crucible, then add 20.142g of potassium hydroxide to cover the above mixture, put it in a resistance furnace for alkali fusion, and the temperature of alkali fusion is 450 ℃, time 120min, cooling after melting;

[0038] B added 50ml of hot water to wash the molten matter, separated the lead particles, weighed after drying, and the crude lead weighed 2.815g;

[0039] C filter the alkali slag and lye with fast filter paper, soak the alkali slag in hydrochloric acid with a mass percentage concentration of 10%, place it in a constant temperature water bath, keep the temperature at 95°C, the time is 30min, and the pH value is maintained at less than 3, Then filter while it is hot, and cool to obtain white needle-like PbCl 2 The precipitate was dried and weighed 0.387g.

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Abstract

The invention discloses a method for extracting lead from waste CRT (Cathode Ray Tube) glass, which belongs to the field of the recycling of inorganic material waste. The method comprises the following main steps of: (A) grinding the waste CRT glass, mixing with strong base and activated carbon and melting for 20-120 minutes at the temperature of 450-800 DEC G; (B) cooling and washing melt with water, separating and filtering crude lead to obtain alkaline residues and alkaline liquor; (C) immersing and cleaning the alkaline residues with diluted hydrochloric acid, filtering and cooling to obtain chlorinated lead sediment, and thus, the purpose of lead extraction is achieved. By means of the method disclosed by the invention, lead can be effectively extracted from the waste CRT glass, and the purpose of reducing environmental effect brought by heavy metal lead; and in addition, waste liquor produced in the extraction process can be circularly used, and the advantages of fewer waste residues, extremely low lead content and no environmental pollution are achieved, thereby, the method has good industrialized popularization and application values.

Description

technical field [0001] The invention relates to a method for extracting lead from lead-containing glass, in particular to a method for extracting lead from waste CRT glass, belonging to the fields of resource comprehensive utilization and environmental protection. Background technique [0002] Cathode Ray Tube (CRT) is widely used in electronic and electrical products, such as the core display components of electronic and electrical equipment such as televisions, monitors and oscilloscopes, due to its mature technology, low price and long life. As TFT-LCD (Thin Film Transistor Liquid Crystal Display) is gradually replacing CRT-type display products, the update speed of CRT electronic products is accelerated, and discarded CRT displays have gradually become one of the important components of electronic waste. At present, there is no good resource utilization technology, which has caused it to become harmful electronic waste. The rational use of CRT glass has become a thorny i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B13/00
CPCY02P10/20
Inventor 田英良梁新辉孙诗兵
Owner BEIJING UNIV OF TECH
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