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两步酸浸法制备煤气化粗渣基复合絮凝剂：合成、絮凝及作用机制

Coal gasification crude slag based complex flocculants by two-step acid leaching process: synthesis, flocculation and mechanisms.

作者信息

Pan Haoqi, Sun Chenxu, Shen Tingting, Sun Jing, He Shaocang, Li Tianpeng, Lu Xuqian

机构信息

School of Environmental Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences) Jinan 250353 P. R. China

出版信息

RSC Adv. 2024 Jan 16;14(4):2705-2719. doi: 10.1039/d3ra07232k. eCollection 2024 Jan 10.

DOI:10.1039/d3ra07232k
PMID:38229713
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10790280/
Abstract

Coal gasification crude slag (CGCS) is the side-product of the coal gasification process, and its effective utilization has attracted great attention. A novel flocculant of poly-aluminum-ferric-acetate-chloride (PAFAC) was synthesized based on the recovery of CGCS by a two-step acid leaching process, namely HCl-acid leaching and HAc-acid leaching, which was optimized by an acid leaching liquor volume ratio of HCl to HAc of 3 : 2, polymerization pH of 3.5, and reaction temperature and time of 70 °C and 3.0 h, respectively. The performance of PAFAC was further evaluated by kaolin simulated wastewater, domestic sewage, river water, and aquaculture wastewater. The results revealed that PAFAC was feasible for the removal of turbidity, chemical oxygen demand (COD) and total phosphorus (TP). Moreover, PAFAC was characterized by X-ray Diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), X-ray fluorescence spectrometry (XRF) and scanning electron microscopy (SEM), which proved that PAFAC was a kind of amorphous polyionic composite. Additionally, the acid leaching kinetics and flocculation mechanisms were further investigated. It was found that the acid leaching process was followed by the unreacted shrinkage core model, and the flocculation process was dominated by charge neutralization, adsorption bridging and precipitation net trapping. The work is expected to develop a new method for the safe disposal of CGCS and provide a novel way for the preparation of Fe-Al composite flocculants, especially, offering a potential strategy for the promotion of the additional value of the coal chemical industry.

摘要

煤气化粗渣（CGCS）是煤气化过程中的副产品，其有效利用已引起广泛关注。基于通过两步酸浸工艺回收CGCS合成了一种新型絮凝剂聚铝铁醋酸氯化物（PAFAC），即盐酸浸出和醋酸浸出，通过盐酸与醋酸的酸浸液体积比为3:2、聚合pH值为3.5、反应温度和时间分别为70℃和3.0 h进行优化。通过高岭土模拟废水、生活污水、河水和养殖废水进一步评估了PAFAC的性能。结果表明，PAFAC对去除浊度、化学需氧量（COD）和总磷（TP）是可行的。此外，通过X射线衍射（XRD）、傅里叶变换红外光谱（FT-IR）、X射线荧光光谱（XRF）和扫描电子显微镜（SEM）对PAFAC进行了表征，证明PAFAC是一种无定形聚离子复合材料。此外，进一步研究了酸浸动力学和絮凝机理。发现酸浸过程遵循未反应收缩核模型，絮凝过程以电荷中和、吸附架桥和沉淀网捕为主。这项工作有望开发一种安全处置CGCS的新方法，并为制备铁铝复合絮凝剂提供一种新途径，特别是为提升煤化工行业的附加值提供一种潜在策略。

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