杂质对Ca(HPO₄)-H₂SO₄-H₃PO₄-H₂O体系中CaSO₄结晶的影响
Effects of Impurities on CaSO Crystallization in the Ca(HPO)-HSO-HPO-HO System.
作者信息
Mu Xinru, Zhu Ganyu, Li Xu, Li Shaopeng, Gong Xiaokang, Li Huiquan, Sun Guoxin
机构信息
School of Chemistry and Chemical Engineering, Institute for Smart Materials & Engineering, University of Jinan, 336 Nanxinzhuang West Road, Jinan 250022, P. R. China.
Key Laboratory of Green Process and Engineering, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
出版信息
ACS Omega. 2019 Jul 25;4(7):12702-12710. doi: 10.1021/acsomega.9b01114. eCollection 2019 Jul 31.
Wet-process phosphoric acid is a fundamental process in the fertilizer industry. The influence of impurities on crystallization kinetics of CaSO was investigated in the Ca(HPO)-HSO-HPO-HO system using a mixed suspension mixed product removal crystallizer. Effects of Si, Al, Fe, Mg, K, and Na on crystal morphology and structure were examined in the highly acidic system through scanning electron microscopy and high-resolution transmission electron microscopy. Results show that the increase of Mg, K, and Na content facilitates crystal growth. Si, Al, and Fe are beneficial to CaSO crystal growth at a certain concentration range. Impurities also affect the crystal morphology, and the addition of Si, Fe, and Na promotes the formation of needle-like crystals compared with other impurities. X-ray diffraction results show that the preferred crystal growth direction is (020), and the interplanar spacing of the crystals is affected by the element radius of the impurities.
湿法磷酸是肥料工业中的一个基本工艺。在Ca(HPO)-HSO-HPO-HO体系中，使用混合悬浮混合产物移除结晶器研究了杂质对CaSO结晶动力学的影响。通过扫描电子显微镜和高分辨率透射电子显微镜在高酸性体系中研究了Si、Al、Fe、Mg、K和Na对晶体形态和结构的影响。结果表明，Mg、K和Na含量的增加促进晶体生长。Si、Al和Fe在一定浓度范围内有利于CaSO晶体生长。杂质也会影响晶体形态，与其他杂质相比，Si、Fe和Na的添加促进针状晶体的形成。X射线衍射结果表明，晶体的择优生长方向为(020)，晶体的面间距受杂质元素半径的影响。
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