关键词: 钠长石, 氟硅酸钠, 微观形貌, 抗压强度, 体积密度, 显气孔率

Abstract: The preparation of foamed ceramics with gold tailings has a broad application prospect， but the sintering temperature is too high. The addition of sintering additives can effectively reduce the sintering temperature of foamed ceramics. Using the mixture of sodium fluosilicate and albite as sintering agents， the gold tailings foamed ceramics were prepared by non-pressing powder sintering method. The effects of the addition ratio of sodium fluosilicate and albite on the micromorphology， compressive strength， bulk density and apparent porosity of the gold tailings foamed ceramics were studied. The results showed that with the increase of sodium fluosilicate proportion， the compressive strength and bulk density of the samples firstly increase and then decrease， the apparent porosity firstly decrease and then increase， and the uniformity of pore size and distribution becomes better. When the addition ratio of sodium fluosilicate and albite is 5∶3 and the sintering temperature is 1 050 ℃， the gold tailings foamed ceramics with bulk density of 455 kg/m3， compressive strength of 4.7 MPa， apparent porosity of 21% and uniform porosity distribution can be successfully prepared. Appropriate addition of albite can increase the number of pores， but excessive addition will lead to the collapse of pore structure due to the high content of low viscosity liquid at high temperature. Sodium fluosilicate should be the main sintering agent and albite should be added according to different requirements to improve the apparent porosity.

Key words: albite, sodium fluosilicate, microscopic morphology, compressive strength, bulk density, apparent porosity