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首页> 外文期刊>Journal of Materials Science >Glass foams from acid-leached phlogopite waste
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Glass foams from acid-leached phlogopite waste

机译:来自酸浸磷酸盐废物的玻璃泡沫

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XRD analysis and exfoliation behaviour of Palabora phlogopite flakes supplied by PMC indicate a heterogeneous mineralogical composition dominated by phlogopite and hydrobiotite. 4 M nitric acid leaching for 6 h at 65 degrees C resulted in amorphous silica flakes with a very high surface area (< 450 m(2) g(-1)). This was used to produce lightweight and high-strength glass foams via a direct foaming method. The best results were obtained with a formulation with borax:waterglass:amorphous silica 23:46:31 wt%. A closed-cell foam with a density of 0.326 g cm(-3) and compressive strength of 2.09 MPa was obtained by heating a compacted mixture at ca. 6 K min(-1) to 525 degrees C and keeping it at that temperature for 30 min before allowing it to cool down. These results suggest that the silica waste, obtained from acid leaching of phlogopite waste from mine tailings, could provide a valuable raw material for the manufacture of low-density glass foams.
机译:PMC供应的Palabora植物薄片的XRD分析和剥离行为表明由磷酸酯和硫酸氢岩支配的异质矿物学组合物。 在65℃下4米硝酸浸出6小时,得到无定形二氧化硅薄片,具有非常高的表面积(<450μm(2)g(-1))。 这用于通过直接发泡法生产轻质和高强度玻璃泡沫。 用硼砂配方获得最佳结果:水玻璃:无定形二氧化硅23:46:31wt%。 密度为0.326g cm(-3)的闭孔泡沫,并通过在Ca的压实混合物中加热压实的混合物获得2.09mPa的压缩强度。 6 k min(-1)至525摄氏度,并在该温度下保持30分钟,然后允许它冷却。 这些结果表明,从矿山尾矿浸出磷酸盐废物的酸浸出中获得的二氧化硅废料可以为制造低密度玻璃泡沫提供有价值的原料。

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