1. Thermal processes for lead removal from the funnel glass of CRT monitors
- Author
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Guilherme Muller Richter, Hugo Marcelo Veit, and Erich Lopes Braitback de Oliveira
- Subjects
Lead removal ,CRT monitors ,Materials science ,Municipal solid waste ,business.product_category ,Eelectronic equipment ,Reducing agent ,electrical waste and electronic equipment ,Glass matrix ,Geochemistry and Petrology ,Thermal ,General Materials Science ,Meio ambiente ,Waste Management and Disposal ,Lead oxide ,Lixo eletrônico ,Waste management ,Geology ,Reciclagem ,Contamination ,Chumbo ,Electrical waste ,Economic Geology ,Funnel ,Leaching (metallurgy) ,business - Abstract
The disposal of CRT monitors increases each year, generating millions of tons of waste containing various types of materials. The glass present in CRT tubes displayed about 20%-25% of lead oxide. If improperly disposed of, this glass can be leached directly in nature or may cause environmental contamination, especially with lead. Because of this leaching possibility, this waste is classified as Class I solid waste, according to the NBR 10004. Thermal processing of these glass tubes was seen as an alternative to remove lead from the glass matrix. Parameters such as reaction time, percentage of reducing agent, the reaction temperature, and atmospheric environment of the system were analyzed in this work. It was concluded that it is possible to remove the lead from the glass matrix by thermal processing. The removal of 92% of the lead from the glass was obtained at 800°C, a vacuum of 1.3 kPa, with 5% carbon as a reducing agent, and 18 hours of thermal processing.
- Published
- 2015
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