Abstract: China's gold tailings have a large amount of resources, and the comprehensive utilization of secondary resources in the field of construction materials has important economic value and environmental significance. Using gold tailings as main raw material and SiC as foaming agent, foamed ceramics were prepared at high temperature. The effects of sintering temperature, amount of gold tailings and particle size of raw materials on bulk density, true porosity and pore size of materials were studied by laser confocal microscope and XRD. The results show that with the increase of sintering temperature, the true porosity and pore diameter of the foamed ceramics increase, while the bulk density decreases. The true porosity and bulk density of the material decrease and increase with the increase of the amount of gold tailings, and increase and decrease with the decrease of the particle size of raw materials. The pore diameter decreases with gold tailings increase or particle size reduction of raw material. After optimization, foamed ceramics with good performance are prepared under the conditions of sintering temperature of 1 050 ℃, 50% of gold tailings, the average particle size of gold tailings D(50)=5.6 μm and the average particle size of SiC D(50)=3.0 μm.
Key words: gold tailing, foamed ceramics, sintering temperature, particle size, porosity, bulk density
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