PROPERTICES OF NON-METALLIC MINERALS FOR BUFFER-BACKFILL MATERIALS

The physicocbemical and engineering properties of six kind of non-metallic minerals which are bentonite,sepiolite clay,attapulgite clay,reetorite clay,kaolinclay and zeolite,including the surface electric charge,cationic exchange capacity,specific surface area,permeate coefficient and the-mai conductivity,have been studied.The adsorption experiment of non-minerals to Cs⁺,Sr²⁺.Co²⁺ have been complete& It is showed that zeolite and bentonite have large surface electric charge and cationic exchange capacity and good adsorption to Cs⁺,Sr²⁺,Co²⁺.The bentonite and rectorite clay have the letter permeate coefficient and the better expansibility and can be used as adsorption and impermeable materials.The zeolites have larger permeate coefficient and cannot be used as impermeable materials,but can be used as adsorption mat.dais.The thermal conductivity of non-metallic minerals is little and need improving thermal conductivity by adding other materials.