Experimental study on synergistic preparation of geopolymers by ultrafine grinding of mineral powder-regenerated micropowder-sodium silicate used sand
In order to study the feasibility of synergic preparation of geopolymers by ultrafine grinding of mineral powders-re-generated micro-powders-sodium silicate used sand,experiments were carried out on the mechanical properties,durability and heavy metal leaching of geopolymers under different grinding parameters,different amounts of regenerated micro-powders-different grinding fineness and different amounts of red mud.The results show that the best grinding parameters are the filling rate of vibration mill 40％and the ratio of feed to ball 1∶12.The best grinding fineness is 700 m2/kg.On this basis,the optimal ratio of geopolymer substrate is 70％mineral powder,20％reclaimed micropowder,10％sodium silicate used sand micropowder.The optimal ratio of activator(accounting for substrate percentage)is 15％P·O52.5 cement,2.5％red mud,2.5％desulfurized gypsum.The leaching percentage of copper,lead,nickel,zinc and cadmium were all within 0.2％.
regenerated micropowderwater glass used sandgeopolymersultrafine grindingstrength
万方数据
维普
