Preparation of lightweight closed-cell ceramsites from iron tailings and their performance
To expand the utilization of iron tailings as secondary resources,lightweight closed-cell ceram-sites were prepared using the SiC foaming method with iron tailings,quartz,and potassium feldspar as raw materials.The effects of the firing temperature(1 120,1 130 and 1 140 ℃ for 3 h),the ceramsite particle size(≤2.5,5-2.5 and 10-5 mm),and the addition of foaming agent SiC(1.0％,1.5％,2.0％,2.5％and 3.0％,by mass)on the structure and properties of the ceramsites were studied by XRD,SEM,FactSage software,etc.The results show that:(1)as the firing temperature and SiC addition increase,the bulk densi-ty and bearing capacity of the ceramsites decrease,and the ceramsites exhibit three pore structures:fine pore,honeycomb,and hollow;(2)with the firing temperature of 1 130 ℃,additions of 80.5 mass％iron tail-ings,10 mass％potassium feldspar,7 mass％quartz and 2.5 mass％SiC,as well as the ceramsite particle size of 10-5 mm,lightweight ceramsites can be obtained with a bulk density of 0.69 g·cm-3 and bearing capacity of 311.2 N.
iron tailingslightweight ceramsitesbulk densitybearing capacity
万方数据
维普
