硅酸盐学报2017，Vol.45Issue(5)：722-728,7.DOI:10.14062/j.issn.0454-5648.2017.05.19
钾霞石酸解-水热晶化纳米高岭石
Hydrothermal Crystallization of Nano-kaolinite from Precursor of Acid Treating Kalsilite
摘要
Abstract
Nearly pure kalsilite (KA1SiO4) was synthesized via hydrothermally treatment of K-feldspar powder with alkaline solution,and an aluminosilicate precursor with a Si/A1 molar ratio close to 1.0 for synthesizing kaolinite (Al2[Si2O5](OH)4) was obtained by destroying the structure of kalsilite in H2SO4-H2O solution with a K2O solubility of 99.8％.The chemical equilibrium in the system of Al2O3·2SiO2·nH2O-HCl-H2O was simulated by OLI Analyzer 9.2 thermodynamical software,predicting the ranges of initial concentration of HCl,water to solid matter ratio and crystallization temperature,in which the equilibrated solid phase is kaolinite with a proportion of ＞ 98％.The optimal conditions and crystallization process of hydrothermally synthesis of kaolinite were determined via the single factor experiments at the predicted parameters.The typical as-synthesized product is nearly single phase nano-sized kaolinite with a purity of 91.8％,highly ordered structure,1Tc polymorph,and sub-hexagonal flake-shape with the diameter of 400-500 nm and the thickness of 20 nm.The crystallization process of kaolinite from the aluminosilicate precursor is aluminosilicate precursor → platy-shaped boehmite→ platy-shaped boehmite + flake-shaped kaolinite--→ sub-hexagonal flake-shaped kaolinite.关键词
钾长石/钾霞石/高岭石/绿色合成/纳米技术Key words
K-feldspar/kalsilite/kaolinite/green synthesis/nano-technology分类
矿业与冶金引用本文复制引用
马鸿文,常倩倩,申继学,杨静,刘昶江,苏双青,刘梅堂,姚文贵,张盼,原江燕..钾霞石酸解-水热晶化纳米高岭石[J].硅酸盐学报,2017,45(5):722-728,7.基金项目
国家自然科学基金(40802013) （40802013）
中国地质调查项目(12120113087700) （12120113087700）
中央高校基本科研业务费(2652015371). （2652015371）
