Detoxification of cathode ray tube glass by self-propagating process

Abstract

a b s t r a c tA novel process for the treatment of hazardous waste Cathode Ray Tube (CRT) glass, based on selfpropagating reaction, was proposed. In the process, various types of CRT glass powders were blended with suitable amount of ferric oxide and magnesium, and the mixtures could generate self-propagating reaction once locally ignited by a thermal source. Generally, the self-propagating reaction could be well maintained when the CRT glass content in the mixture was no more than 60 wt.%, and the combustion wave velocity and maximum combustion temperature decreased along with the increase in glass amount. XPS experiments showed that heavy elements in the final products became more stable and were solidified during the process. Leaching tests demonstrated that heavy metals in the final products fulfilled the environmental regulations of USEPA. It is supposed that the detoxified products have the potential of being used as construction materials.

Utilization of recycled glass derived from cathode ray tube glass as fine aggregate in cement mortar

“…Studies have been carried out by various researchers to solve the discarded CRT waste problem, particularly with regard to the methods to reuse/recycle leaded funnel glass as it contains a large amount of lead [3][4][5][6][7]. Generally, there are three possible options for leaded CRT glass recycling.…”

E-waste: A Review of CRT (Cathode Ray Tube) Recycling

“…The reaction medium is formed by adding to the process system substances such as carbon or iron, which are more active than lead. At the end of the reaction, the oxygen bound to the lead combines with the more active substances, leading to lead formation in the products [10]. 99% of the lead in CRT waste can be obtained with high purity.…”

“…These components can be absorbed by soil over time, and can be passed indirectly to animals and humans [7][8][9]. Lead is particularly harmful to the environment and is the most commonly found heavy metal in CRT devices [10].…”

Management practices for end-of-life cathode ray tube glass: Review of advances in recycling and best available technologies

“…A novel process for detoxifying CRTs, which involved blending CRT glass powder with suitable amounts of ferric oxide and magnesium, has been developed (Chen et al, 2009b). This technique, which is typically used for the synthesis of materials (referred to as ‘self-propagating high-temperature synthesis’ or SHS), is characterised by the fact that once the starting mixture (CRT glass powder, ferric oxide, and magnesium) is ignited by the means of external thermal sources for relatively short times, a self-propagating reaction in the form of combustion wave rapidly travels through the mixture without requiring additional energy; thus, converting reactants into products.…”