摘要
以氧化钙为反应物料,在200～250℃的水热反应条件下分解钾长石。实验研究了在不同的Ca/(Si+Al)摩尔比、水固比、反应温度和反应时间条件下,钾长石中K2O的溶出率和固相的物相变化。结果表明,液相中K2O的溶出率为40%～87%,固相反应产物为结晶良好雪硅钙石晶体。采用化学分析、XRD、SEM、DSC_TG和BET等方法对合成的雪硅钙石粉体进行了表征,结果表明,合成的雪硅钙石粉体是由长5～10μm、宽100～200nm、厚度为49～50nm的薄片纤维晶体交织成的直径为30～40μm的空心球形团聚体,耐火温度高于650℃,是制备硅酸钙保温材料的良好原料。
The dissolving rate of K_2O from potassium feldspar and the solid phase transformation were experimentally studied at 200～250℃ on hydrothermal_dissolving potassium feldspar, with CaO as the reactant and under the conditions of different Ca/(Al+Si) molar ratios, liquid/solid weight ratios, reaction temperatures and reaction periods. The experimental results indicate that the dissolving rate of K_2O from potassium feldspar is 40%～80% and the solid product is well_crystallized fibrous tobermorite. Wet chemical analysis, XRD, SEM, DSC_TG and BET methods were used to characterize the synthesized tobermorite powers. The synthesized samples are hollow spherical agglomerates formed by fibrous tobermorite crystals, which are 49～50 nm in thickness, 100～200 nm in width and 5～10 μm in length, suitable for making calcium silicate insulation materials. The heat insulating temperature of the synthesized tobermorite powder materials is as high as 650℃.
出处
《岩石矿物学杂志》
CAS
CSCD
北大核心
2005年第4期333-338,共6页
Acta Petrologica et Mineralogica
基金
矿物材料国家专业实验室开放基金资助项目(04103)
关键词
钾长石
雪硅钙石
氧化钾
水热反应
potassium feldspar
tobermorite
potassium oxide
hydrothermal decomposition reaction
