关键词: 铁尾矿, 轻质陶粒, 堆积密度, 承载能力

Abstract: To expand the utilization of iron tailings as secondary resources,lightweight closed-cell ceramsites 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 density 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 tailings,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.

Key words: iron tailings, lightweight ceramsites, bulk density, bearing capacity