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A kind of wet extraction method of lead in waste CRT cone glass

A conical glass and wet process technology, which is applied in the field of hazardous waste treatment and resource utilization, can solve the problems of difficult industrialization, high energy consumption, and large amount of waste residues, etc., and achieves easy large-scale industrial production, mild reaction conditions, and process The effect of simple process

Active Publication Date: 2016-08-17
南陵县建设投资有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are many technical bottlenecks and environmental problems in the current lead extraction method, and it is difficult to realize industrialization.
For example, in the process of pyrometallurgy, CRT cone glass is used instead of ore as a flux and put into the lead smelting furnace, but this method has problems such as large amount of waste residue and high energy consumption.
The cost of subcritical lead extraction is relatively high, and there is no prospect of market promotion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Add 30g of CRT cone glass to 240mL of sodium hydroxide solution with a concentration of 8mol / L, then add 11.19g of sodium sulfide at a molar ratio of Pb / S=1:5, and react at 100°C for 15h; after the reaction is completed, filter and separate to obtain Brown-black solid, the conversion rate of lead oxide in CRT cone glass can reach 40%. The PbO content in the CRT cone glass is 21.34%, and the particle size is 300 mesh.

Embodiment 2

[0015] Add 40g of CRT cone glass to 160mL of sodium hydroxide solution with a concentration of 20mol / L, then add 5.01g of potassium sulfide according to the molar ratio of Pb / S=1:1.2, and react at 220°C for 8h; after the reaction, filter and separate to obtain Brown-black solid, the conversion rate of lead oxide in CRT cone glass can reach 90%. The PbO content in the CRT cone glass is 21.15%, and the particle size is 700 mesh.

Embodiment 3

[0017] Add 50g of CRT funnel glass to 250mL of sodium hydroxide solution with a concentration of 9mol / L, then add 5.80g of sodium hydrosulfide at a molar ratio of Pb / S=1:2, and react at 120°C for 14h; after the reaction, filter and separate, A brownish black solid is obtained, and the conversion rate of lead oxide in the CRT cone glass can reach 45%. The PbO content in the CRT cone glass is 23.10%, and the particle size is 500 mesh.

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Abstract

The invention discloses a method for extracting lead from waste CRT (cathode ray tube) cone glass by a wet process. The method comprises the following steps: adding CRT cone glass into an 8-20 mol / L sodium hydroxide solution, adding a precipitating agent until the mole ratio of the Pb ions in the CRT cone glass to the S ions in the precipitating agent is 1:(1.2-5), and reacting at 100-220 DEG C for 8-15 hours; and after the reaction finishes, filtering, and separating to obtain the brownish black solid. The method overcomes the defects of complex technique, high energy consumption and high tendency to generating secondary pollution in the existing lead extraction technique. The method has the advantages of mild reaction conditions, simple technical process, high lead extraction efficiency and the like, and can easily implement large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of hazardous waste treatment and resource utilization, and particularly relates to a method for wet extraction of lead in waste CRT cone glass. Background technique [0002] As an important leaded glass product, cathode ray tube (CRT) is widely used in electrical and electronic equipment such as televisions, computer monitors, and oscilloscopes. At present, there are about 550 million TV sets in my country, the vast majority of which are CRT TV sets, and more than 40 million computer CRT monitors, and a large number of electronic and electrical products have entered the peak period of elimination and scrapping. Tsinghua University, China Household Electrical Appliance Research Institute, Chinese Academy of Environmental Sciences and other units have predicted the amount of scrapped household appliances. It is estimated that by 2015, the amount of scrapped color TVs and computers will reach 35-55 million sets...

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 姚志通黄进刚张春晓张素玲
Owner 南陵县建设投资有限责任公司