Efficient removal of Al(III) and P507 from high concentration MgCl2 solution based on in-situ reaction strategy

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China Pub Date : 2024-09-01 DOI:10.1016/S1003-6326(24)66594-5

Qiang WANG , Meng WANG , Zong-yu FENG , Yong-qi ZHANG , Xiao-wei HUANG , Xiang-xin XUE

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Abstract

For a highly efficient recycling of a wastewater containing a high concentration of MgCl₂, Al(III) and P507 were scheduled to be removed in advance. In this study, the in-situ removal of Al(III) and P507 from a high concentration MgCl₂ solution at different pH values and Al/P molar ratios was investigated. The results showed that P507 formed organic complexes of Al_x(OH)^z+_y-P507 at pH of 2.0−4.0. At pH of 4.0−5.0, Al(III) precipitated and transferred into Al(OH)₃ with a flocculent amorphous morphology. Active sites on the Al(OH)₃ surface enhanced the removal efficiency of P507. At pH of 6.0−6.5, Al(III) and Mg(II) formed layered crystalline Al(OH)₃ and MgAl₂(OH)₈ with small pore channels and fewer active sites, resulting in a reduced removal efficiency of P507. When the Al/P molar ratio exceeded 13 and the pH was between 4.0 and 5.0, the removal rates of both Al(III) and P507 were higher than 98%, while the concentration loss of Mg(II) was only 0.2%−0.9%.

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基于原位反应策略从高浓度氯化镁溶液中高效去除铝（III）和 P507

为了高效回收含有高浓度氯化镁的废水，计划提前去除 Al（III）和 P507。本研究考察了在不同 pH 值和 Al/P 摩尔比条件下原位去除高浓度氯化镁溶液中的 Al(III) 和 P507 的情况。结果表明，在 pH 值为 2.0-4.0 时，P507 与 Alx(OH)z+y-P507 形成有机络合物。在 pH 值为 4.0-5.0 时，Al(III)沉淀并转化为 Al(OH)3，呈现絮状无定形形态。Al(OH)3 表面的活性位点提高了 P507 的去除效率。当 pH 值为 6.0-6.5 时，Al(III) 和 Mg(II) 形成了层状结晶 Al(OH)3 和 MgAl2(OH)8，孔道较小，活性位点较少，导致 P507 的去除效率降低。当 Al/P 摩尔比超过 13 且 pH 值在 4.0 至 5.0 之间时，Al(III) 和 P507 的去除率均高于 98%，而 Mg(II) 的浓度损失仅为 0.2% 至 0.9%。

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来源期刊

Transactions of Nonferrous Metals Society of China 工程技术-冶金工程

CiteScore

7.40

自引率

17.80%

发文量

8456

审稿时长

3.6 months

期刊介绍： The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.