硅酸盐通报2017，Vol.36Issue(10)：3446-3451,6.
从含碱硅酸钠溶液中水热合成硅灰石
Hydrothermal Synthesis of Wollastonite from Alkaline Sodium Silicate Solution
摘要
Abstract
With alkaline sodium silicate solution used as raw material and lime milk been poured into at the atmospheric pressure , CaO · SiO2 · H2O was first obtained after hydrothermal treatment , and after calcinated for 2 h at 850 ℃, CaO · SiO2 · H2O was transformed to wollastonite .The effects of SiO 2 concentration , molar ratio of silicon to calcium ( C/S ) and the reaction time on synthesis of wollastonite were examined.The thermodynamics calculation results indicated that CaO · SiO2 · H2O and 2CaO· SiO2 · 1.17H2O were most likely formed in Na2O-CaO-SiO2-H2O system at atmospheric pressure .The experimental results reveal that:When C/S is 1.0, silicate anions polymerization degree increases with the increasing of the concentration of silicon in solution , which will be conducive to the preparation of wollastonite.With the extension of time, the wollastonite crystallinity is higher.When C/S is 0.6、0.8、1.0, the product is CaSiO3.When C/S is 1.5、2.0, a large number of Ca2SiO4 produced in the final product.The optimum condition for preparation of wollastonite is:SiO2 concentration is more than 30 g/L, the hydrothermal temperature is 98 ℃, C/S is 0.6-1.0 and the hydrothermal time is more than 3 h.关键词
硅灰石/含碱硅酸钠溶液/常压/水热合成Key words
wollastonite/alkaline sodium silicate solution/atmospheric pressure/hydrothermal synthesis分类
建筑与水利引用本文复制引用
王仲明,彭志宏,齐天贵,周秋生,刘桂华,李小斌..从含碱硅酸钠溶液中水热合成硅灰石[J].硅酸盐通报,2017,36(10):3446-3451,6.基金项目
中南大学"创新驱动计划"(2015CX001) （2015CX001）
