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硅酸钾碱液水热合成针状硅灰石反应历程
作者: 征1 2 马鸿文1  静1 
单位:1. 中国地质大学(北京)材料科学与工程学院 北京 100083  2. 昊青新材(北京)技术有限公司 北京 100083 
关键词:钾长石 硬硅钙石 硅灰石 绿色合成 
分类号:TQ443.5
出版年,卷(期):页码:2017,45(11):0-0
DOI:10.14062/j.issn.0454-5648.2017.11.17
摘要:
利用钾长石–KOH–H2O 体系分解反应所得硅酸钾碱液合成针状硬硅钙石,用作合成硅灰石的前驱体。采用OLI
Analyzer 9.2 软件模拟K2O–CaO–SiO2–H2O 体系化学平衡,预测了合成硬硅钙石的初始CaO/SiO2 摩尔比、反应温度和液固比
范围。在此基础上通过单因素实验,确定了合成硬硅钙石的优化条件。反应历程为:水合硅酸钙→雪硅钙石→雪硅钙石+硬
硅钙石→硬硅钙石。合成的硅灰石保持了硬硅钙石的针状形貌,分散较均匀,长约10~15 μm,直径约300 nm,长径比约40,
符合建材行业一级品标准。

 Xonotlite, as a precursor for synthesizing acicular wollastonite, was synthesized using K-feldspar alkai-leaching filtrate as

a silicon source. The chemical equilibrium in the system of K2O–CaO–SiO2–H2O was simulated by a thermodynamical software
named OLI Analyzer 9.2, predicting the effects of initial CaO/SiO2 molar ratio, reaction temperature, and liquid-solid ratio as well.
The optimal conditions and reaction process of synthesis of xonotlite were determined at the predicted parameters. The reaction
process of xonotlite from the alkai-leaching filtrate is calcium silicate hydrate → tobermorite → tobermorite + xonotlite → xonotlite.
The size of resultant acicular wollastonite is 10–15 μm in length and approximately 300 nm in diameter, and the product is conformed
as a prime standard material in building materials industry.
基金项目:
中国地质调查项目(12120113087700),中央高校基本科研业 务费(53200859555)资助项目
作者简介:
罗 征(1988—),男,博士研究生
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