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Synthesis of kalsilite from microcline powder by an alkali-hydrothermal process

International Journal of Minerals,Metallurgy and Materials 2014年第8期21卷 826-831页

作者： Shuang-qing Su Hong-wen Ma Jing Yang Pan Zhang Zheng Luo National Laboratory of Mineral Materials China University of Geosciences Blue Sky Technology Corporation

The properties of aluminosilicate kalsilite have attracted the interest of researchers in chemical synthesis, ceramic industry, biofuels, etc. In this study, kalsilite was hydrothermally synthesized from microcline powder in a KOH solution. The microcline powder, rich in potassium, aluminum, and silicon, was collected from Mountain Changling in Northwestem China. The effects of temperature, time, and KOH concentration on the decomposition of microcline were investigated. The kalsilite and intermediate products were characterized by means of wet chemistry analysis, X-ray Diffraction （XRD）, infi＇ared spectrometry （IR）, 29Si magic angle spinning nuclear magnetic resonance （29Si MAS NMR）, 27A1 MAS NMR, and scanning electron microscope （SEM）. With increasing temperature, the microcline powder transforms into a metastable KAlSiO4 polymorph before transforming further into pure kalsilite. A mixture of both kalsilite and metastable KAlSiO4 polymorph is obtained when the hydrothermal reaction is carried out within 2 h; but after 2 h, kalsilite is the predominant product. The concentration of KOH, which needs to be larger than 4.3 M, is an important parameter influencing the synthesis ofkalsilite.

关键词： kalsilite microcline potassium hydroxide hydrothermal synthesis

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Role of MgF2 addition on high energy ball milled kalsilite:Implementation as dental porcelain with low temperature frit

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Journal of Advanced Ceramics 2014年第4期3卷 332-338页

作者： Pattem Hemanth KUMAR Abhinav SRIVASTAVA Vijay KUMAR Nandini JAISWAL Pradeep KUMAR Vinay Kumar SINGH Department of Ceramic Engineering Indian Institute of Technology(BHU)VaranasiIndia Department of Chemical Engineering Indian Institute of Technology(BHU)VaranasiIndia

Porcelain fused to metal(PFM)has received great attention over the last few years due to its importance in the ***(K_(2)O·Al_(2)O_(3)·SiO_(2))is a high thermal expansion porcelain,suitable for bonding to ***,kalsilite is a metastable phase which gets converted into crystalline leucite upon *** the current work feasibility of developing stable kalsilite phase,dispersion of MgF2 in it as an additive and using mechanochemical synthesis are *** fine dental material has been formulated by mixing prepared kalsilite with low temperature frit(LTF)in different *** crystalline phases evolved in fired powders are characterized by powder X-ray diffraction(XRD)*** with different ratio of LTF has been cold pressed and heat treated to examine its coefficient of thermal expansion(CTE),flexural strength,apparent porosity(AP),bulk density(BD)and *** indicate that MgF_(2) addition and high milling duration help in kalsilite *** also plays an important role in this stabilization,and at 1100℃single phase kalsilite formation is *** outcomes demonstrate that it is easily possible to synthesize a stable single phase kalsilite with desirable properties.

关键词： kalsilite porcelain fused to metal(PFM) dental ceramic mechanochemical synthesis thermal expansion X-ray diffraction(XRD)

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Transesterification of soybean oil to biodiesel over kalsilite catalyst

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Frontiers of Chemical Science and Engineering 2011年第3期5卷 325-329页

作者： Guang WEN Zifeng YAN School of Chemistry&Chemical Engineering China University of PetroleumQingdao 266555China

The transesterification reaction of soybean oil with methanol over kalsilite-based heterogeneous catalysts was *** kalsilite was synthesized from potassium silicate,potassium hydroxide,and aluminum nitrate aqueous solutions by controlling the pH value at *** calcination in air at 1200°C,a very porous kalsilite(KAlSiO4)was obtained with surface pores ranging from 0.2 to 1.0µ***,this kalsilite had relatively low catalytic activity for the transesterification reaction.A biodiesel yield of 54.4%and a kinematic viscosity of 7.06 cSt were obtained at a high reaction temperature of 180°C in a batch *** catalytic activity of kalsilite was significantly enhanced by introducing a small amount of lithium nitrate in the impregnation method.A biodiesel yield of 100%and a kinematic viscosity of 3.84 cSt were achieved at a temperature of only 120°C over this lithium modified catalyst(2.3 wt-%Li).The test of this lithium modified catalyst in pellet form in a laboratory-scalefixed-bed reactor showed that it maintained a stable catalytic performance with a biodiesel yield of 100%over thefirst 90 min.

关键词： kalsilite heterogeneous catalyst transesterification biodiesel

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Preparation of Potassium Sulphate from Microcline Powder

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矿物学报 2013年第S1期33卷 83-83页

作者： SU Shuangqing MA Hongwen YANG Jing CAI Biya ZHANG Pan School of materials science and technology China University of Geosciences

Agricultural potassium sulphate is one of the most important non-chloride potash, which is the main fertilizer of avoid chlorine crop. Soluble potassium resource is bare in China, while insoluble potassium resource with the main mineral of microcline is extremely abundant. The microcline powder used is collected from Mountain Changling, Luonan county of Shaanxi Province. The chemical analysis results showed that the main chemical components of the powder are SiO2, Al2O3 and K2O, the K2O content is up to 13.56% (shown in table 1).

关键词： potassium feldspar kalsilite potassium sulphate hydrothermal process

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