摘要
研究了微硅粉中SiO2在稀碱溶液中的溶解行为及溶解动力学,考察了反应时间、NaOH初始浓度及反应温度对SiO2浸出率的影响,并分析了原料和浸出渣的物相.结果表明,SiO2的浸出率随碱初始浓度和反应温度增加而增加.微硅粉中无定型SiO2在NaOH稀碱液中的溶解表观活化能为18kJ/mol,说明该溶解反应由扩散控制.
The dissolution behavior and dissolution kinetics of fine SiO2 powder in dilute alkaline solution were studied. The effects of initial concentration of NaOH, reaction time and reaction temperature on the dissolution rate of fine silica powder were investigated. XRD was used to analyze the phases of fine silica powder and leaching residue. The results demonstrated that SiO2 dissolution rate increased with initial concentration of NaOH and reaction temperature. Dissolution apparent activation energy of the amorphous SiO2 of fine silica powder in dilute NaOH solution was 18 kJ/mol. Dissolution reaction was controlled by diffusion.
出处
《过程工程学报》
CAS
CSCD
北大核心
2012年第2期212-217,共6页
The Chinese Journal of Process Engineering
基金
国家自然科学基金资助项目(编号:20976181)
关键词
微硅粉
稀碱液
浸出渣
SIO2
溶解动力学
fine silica powder
low-concentration alkali solution
leaching residue
SiO2
dissolution kinetics
