影响硅灰石制多孔SiO_2粉体产率因素的考察

Study on the factors affecting the productivity of porous silica powder prepared from wollastonite

在不考虑交互作用情况下 ,设计了五因素四水平正交实验以考察诸因素对硅灰石制多孔SiO2 粉体产率的影响。实验结果表明 ,当反应时间统一为 80min ,陈化时间 2 0min ,反应温度 5 0～ 5 5℃ ,所用酸为 12MHCl,硅灰石用量为 80g时 ,悬浮液质量分数对粉体产率影响最大 ,NH4 Cl添加量影响最小。产率最大的条件为悬浮液质量分数 2 0 % ,表面活性剂选用PEC2 0 0 0 0 ,体系最终 pH值为 6.0 ,NH4 Cl添加量为 5 % ,表面活性剂加入时间为 40min。验证实验结果基本符合这一结论。

Unconsidering the mutual effect,five factor and four level crossing link experiments were designed to study the factors affecting the productivity of porous silica powder prepared from wollastonite.The results showed that the suspension density affected the productivity most obviously and NH 4Cl addition lest obviously when the reaction time was 80 min,ageing time 20 min,temperature 50～55℃,the acid 12M HCl and wollastonite 80g.The conditions to obtain the highest productivity were suspension density 20%,surfactant PEG20000,the final pH value 6.0,NH 4Cl addition 5%,adding surfactant time at 40min.The results of proving experiment accorded with this conclusion.