CAJ | 학술논문

对云南某磷尾矿进行了物相和成分分析，针对其 SiO2含量较高的特点，以碳酸钠为熔剂提取磷尾矿中的SiO2，再以反应制得的硅酸钠母液为原料通过化学沉淀法制备了超细 SiO2，考察了 SiO2提取条件和超细 SiO2制备条件。确定最优的 SiO2提取条件为：煅烧温度850℃、投料比1.6∶1、煅烧时间10 min；超细 SiO2制备条件为：终点 pH＝7、盐酸浓度1 mol·L－1、表面活性剂 CTAB 添加量0.94％。用 XRF、XRD、BET、激光粒度仪、FTIR 对产品进行了表征，所得超细 SiO2是非晶态物质，D 50＝120 nm、比表面积652.1866 m2·g－1、纯度99.05％。
대운남모린미광진행료물상화성분분석，침대기 SiO2함량교고적특점，이탄산납위용제제취린미광중적SiO2，재이반응제득적규산납모액위원료통과화학침정법제비료초세 SiO2，고찰료 SiO2제취조건화초세 SiO2제비조건。학정최우적 SiO2제취조건위：단소온도850℃、투료비1.6∶1、단소시간10 min；초세 SiO2제비조건위：종점 pH＝7、염산농도1 mol·L－1、표면활성제 CTAB 첨가량0.94％。용 XRF、XRD、BET、격광립도의、FTIR 대산품진행료표정，소득초세 SiO2시비정태물질，D 50＝120 nm、비표면적652.1866 m2·g－1、순도99.05％。
The phase and composition of Yunnan phosphate tailings were analyzed.According to the charac-teristics of high concentration of SiO2 ,SiO2 was extracted from phosphate tailings using sodium carbonate as flux,and then ultrafine SiO2 was prepared by chemical precipitation method using mother liquor of sodium sili-cate as raw material.The SiO2 extraction conditions and ultrafine SiO2 preparation conditions were studied.Op-timal SiO2 extraction conditions were as follows:calcining temperature of 850 ℃,material ratio of 1.6∶1,calci-ning time of 10 min.Optimal ultrafine SiO2 preparation conditions were as follows:terminal pH value of 7,con-centration of hydrochloric acid of 1 mol·L-1 ,dosage of surfactant CTAB of 0.94%.The product was charac-terized by XRF,XRD,BET,laser particle size analyzer and FTIR.The ultrafine SiO2 with 99.05% of purity was amorphous substance,D 50 =120 nm,the specific surface area was 652.1866 m2 ·g-1 .