硅粉(SF)是硅铁行业的主要副产品,它的处置带来了重大的环境问题。为了解决这个问题,采用可持续的方法使用沉淀法将SF转化为二氧化硅粉末。该过程涉及煅烧,酸沉淀,老化,和干燥,利用硅粉和氧化钙等工业副产品。各种参数,包括盐酸浓度,水浴温度,老化pH值,老化温度,和老化时间,进行了系统的研究,以优化所得二氧化硅产品的性能。使用X射线衍射(XRD),X射线荧光(XRF),扫描电子显微镜(SEM),傅里叶变换红外光谱(FTIR),激光粒度分析,和邻苯二甲酸二丁酯(DBP)吸收试验。在最佳条件下(盐酸浓度为20%,水浴温度90℃,老化pH3-4,老化温度90℃,和8小时的老化时间),所得二氧化硅产品的纯度为98.5866%,DBP吸收值为2.85mL/g,粒径为6.07微米,符合国家行业标准。这种环境友好且成本有效的合成路线为大规模生产提供了实用的解决方案。
Silica fume (SF) is a major voluminous and bulky by-product of the ferrosilicon industry, and its disposal poses a significant environmental concern. To address this issue, a sustainable approach was employed to transform SF into
silica powder using a precipitation method. The process involved calcination, acid precipitation, aging, and drying, utilising industrial by-products such as
silica fume and calcium oxide. Various parameters, including hydrochloric acid concentration, water bath temperature, aging pH, aging temperature, and aging time, were systematically investigated to optimise the properties of the resulting silica product. The physical and chemical attributes of the processed
silica were thoroughly examined using techniques such as X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), laser particle size analysis, and dibutyl phthalate (DBP) absorption tests. Under optimal conditions (hydrochloric acid concentration of 20%, water bath temperature of 90℃, aging pH 3-4, aging temperature of 90℃, and aging time of 8 hours), the resulting
silica product achieved a purity of 98.5866%, a DBP absorption value of 2.85 mL/g, and a particle size of 6.07 µm, meeting national industry standards. This environmentally benign and cost-efficient synthesis route offers a practical solution for large-scale production.