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Preparation and Influencing Factor Research of Ultrafine Silica Powder Prepared from Salt Leaching Residue of Asbestos Tailings

Zeng Li1,2 Sun Hongjuan1,2 Peng Tongjiang1,2(1 Key Laboratory of Solid Waste Treatment and Resource Recycle Ministry of Education,Southwest University of Science and Technologly,Mianyang,Sichuan 621010;2 Institute of Mineral Materials & Application,Southwest University of Science and Technology,Mianyang,Sichuan 621010)  
Ultrafine silica powder was prepared via simultaneous injection of sodium metasilicate and sulfuric acid solution into a reaction vessel under constant pH value of 7.5.The sodium metasilicate was prepared from salt leaching residue of asbestos tailings via alkaline leaching.Influencing factors of properties for ultrafine silica powder,including the concentration of sodium metasilicate,temperature,amount of surfactant and electrolyte and drying methods were investigated.The morphology,structure and particle size of the silica samples were characterized by scanning electron microscopy,X-ray diffraction,infrared spectrometer and laser particle size analyzer.The results indicates that the yield of silica is greatly influenced by the concentration of sodium metasilicate and temperature,the aggregation phenomena of the silica can be controlled by washing the precipitum with ethanol.The chemical structure of the silica is amorphous hydrated silicon oxide,the specific surface area is 102.43 m2/g and the yield of the silica is above 75% at the optimum experimental conditions.
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