The treatment of spent fluorescent lamps with high content of mercury by stabilisation/solidification processes was investigated. At the end-of-life of these lamps, mercury may still be in elemental form or could be incorporated as oxide into fluorescent layer called "phosphor." Due to high mercury content, the spent fluorescent lamps are considered hazardous waste, and therefore, dangerous for both human health and environment. Based on both leaching tests and mathematical modelling, it was established that the solidification of glass derived from spent fluorescent lamps with cement leads to a solidified material characterised by a high Leachability Index (LI). These results highlight a good behaviour to leaching, and therefore a low mobility of mercury in the solidified material. It is also shown that the solidified material could candidate for a non-hazardous waste in relation to mercury.
