Abstract

Ceramic foams were elaborated from gold-silver tailings and sodium silicates as foaming agent. The effects of the temperature and sintering time in a range of 850–880 °C and 30–45 min, respectively, were evaluated. The foams obtained were characterized determining their apparent density, porosity percentage, volumetric expansion, mean pore size, and mechanical strength. The results show that the sintering time had a greater impact on the properties of the foamed material than the sintering temperature, since it was observed that the characteristics of the studied foams as a function of time had a bigger variation. In addition, an almost direct linear trend with porosity, pore diameter, volumetric expansion, and an inverse linear trend with apparent density and mechanical strength was observed. The ceramic foams obtained in the investigation achieved commercial properties at certain conditions, showing uniform pore distribution, apparent densities lower than 1.0 ton/m³, pore size lower than 1.0 mm, and mechanical strength greater than 0.4 MPa. Regarding these features, the parameters that achieved the best characteristics of ceramic foams from gold-silver tailings were obtained at temperatures of 850 ºC and 860 ºC and sintering times from 45 and 35 min, respectively.

Graphical Abstract

中文翻译：

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在陶瓷泡沫的精加工中使用金银尾矿

摘要

陶瓷泡沫由金银尾矿和硅酸钠作为发泡剂制成。分别评估了温度和烧结时间在850–880°C和30–45 min范围内的影响。通过确定其表观密度，孔隙率百分比，体积膨胀，平均孔径和机械强度来表征获得的泡沫。结果表明，烧结时间比烧结温度对泡沫材料的性能影响更大，因为观察到所研究的泡沫的特性随时间变化较大。另外，观察到具有孔隙率，孔径，体积膨胀的几乎直接的线性趋势，以及具有表观密度和机械强度的相反的线性趋势。³，孔径小于1.0mm，机械强度大于0.4MPa。关于这些特性，分别在850℃和860℃的温度下以及分别在45分钟和35分钟的烧结时间下获得了从金－银尾矿获得最佳陶瓷泡沫特性的参数。

图形概要