Inhibition of interaction between kaolinite and K2CO3 by pretreatment using calcium additive |
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| Authors: | Jia Tang Rui Guo Jie Wang |
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| Institution: | 1. Department of Chemical Engineering for Energy, Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, East China University of Science and Technology, 130 # Meilong Road, Shanghai, 200237, People’s Republic of China
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| Abstract: | The aim of this paper is to investigate an approach for inhibiting the interaction of kaolinite with K2CO3 via the pretreatment with calcium additive (Ca(OH)2 or CaCO3). The reactions between kaolinite, calcium additive, and K2CO3 were, therefore, examined by means of thermogravimetry, differential scanning calorimetry, X-ray diffraction analysis, and inductively coupled plasma atomic emission spectrometry. It was found that Ca(OH)2 could interact with kaolinite at low temperature, although the bulk reaction indeed required a temperature of higher than 900 °C to afford a crystalline calcium aluminosilicate product. The addition of Ca(OH)2 to kaolinite even without heat pretreatment was proved to be significantly resistant to the reaction of kaolinite with K2CO3, while CaCO3 showed such a smaller effect. The high-temperature product, calcium aluminosilicate, exhibited an almost complete inactivity for reaction with K2CO3 at a typical temperature of catalytic coal gasification (750 °C). |
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