CO2 Mineralization of Activated K-Feldspar + CaCl2 Slag To Fix Carbon and Produce Soluble Potash Salt

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• 作者：Longpo Ye ; Hairong Yue ; Yufei Wang ; Haoyi Sheng ; Bo Yuan ; Li Lv ; Chun Li ; Bin Liang ; Jiahua Zhu ; Heping Xie
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：July 2, 2014
• 年：2014
• 卷：53
• 期：26
• 页码：10557-10565
• 全文大小：527K
• ISSN：1520-5045

文摘

We report an alternative technology for the mineralization of CO₂ and production of soluble potash fertilizer via thermal activation of the insoluble K-feldspar with industrial waste of CaCl₂ with lower energy consumption since the activation temperature was about 800鈥?00 掳C compared with the conventional temperature of 1300 掳C. A remarkable K-extraction and CO₂ mineralization ratio could be obtained at an appropriate activation temperature and content of additive CaCl₂, which possessed the exchange of skeletal K⁺ with dissociative Ca²⁺ to form soluble K⁺ species, the collapse of K-feldspar framework, and the formation of intermediates (e.g., anorthite, pseudowollastonite, and wollastonite) to react with CO₂. Characterization results (e.g., XRD, EDS, and SEM) indicated that pseudowollastonite and wollastonite were the major species to fix CO₂. Moreover, the reaction principles of the K-extraction and CO₂ mineralization were discussed, and a possible mechanism was proposed.