Research on the Thermal Decomposition Process of K-Feldspar-CaSO₄-CaO System

Abstract:

The thermal decomposition process of K-feldspar-CaSO₄-CaO system was studied by X-ray diffraction (XRD) analysis of the product which calcined at 1473K. The results show that KAlSi₃O₈ firstly is decomposed into KAlSi₂O₆ and released the SiO₂, then has a complex reaction between KAlSi₂O₆ and CaO, which generated intermediates-K₂SiO₃ under the operating conditions. K₂SiO₃ is unstable and reacted with calcium sulfate to generate K₂SO₄. When the CaO amount is insufficient, the main products are KAlSi₂O₆ and 2CaOAl₂O₃SiO₂, the potassium existed as K₂S₂O₈; when n (CaO) / n (KAS₆) 12:1, the products will further transfer into CaOSiO₂ and 2CaO SiO₂ and the potassium existed as K₂SO₄.

• Periodical: Advanced Materials Research (Volumes 734-737)
• Pages: 916-920
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.734-737.916
• Online since: August 2013
• Authors: Jing Xia Chao, Ju Pei Xia, Chao Qin Yang, Zhao Shu Zhang, Xue Jiao Ren
• Keywords: CaO, CaSO₄, K-Feldspar, Thermal Decomposition

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