| abstract |
Summary of the description n n n The subject of the invention is a method for reduction of chloride leaching rate from mineral mixtures comprising waste with high concentrations of soluble chlorides, where the said method is solidification and stabilisation of waste. n The method according to the invention consists in that waste with high concentrations of soluble chlorides, characterized by that waste containing calcium hydroxide and soluble chlorides at concentrations of up to 35%, and generated by waste to energy processing of industrial or municipal waste or by another thermal process generating such waste, is mixed with an aluminium-bearing material which is a source of activated aluminium oxide, with a waste to aluminium-bearing material ratio between 1:1 and 11:1, until a homogeneous mixture is obtained. If required, which depends on the moisture content in the waste and the expected / required consistence of the mixture, its two components are also mixed with water at a ratio from 0 to 40% of the mixture mass. The order of mixing the mixture components is arbitrary; however, it is most preferable to first mix the waste with a high concentration of soluble chlorides with the aluminium-bearing material, and then to mix the mixture with water, if any water is required, and the resulting fresh mixture is solidified by hydrothermal processing at a temperature between 40 and 200°C for 6 to 24 hours in an atmosphere of steam (water vapour). |