首页|基于原位反应策略高效去除高浓度MgCl2溶液中的Al(Ⅲ)和P507

基于原位反应策略高效去除高浓度MgCl2溶液中的Al(Ⅲ)和P507

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为了实现含高浓度MgCl2废水的循环利用,需要提前去除其中的Al(Ⅲ)和P507.本文作者研究了不同pH值以及不同Al/P摩尔比对Al(Ⅲ)和P507原位去除效果的影响.研究结果表明,当pH值为2.0～4.0时,P507会形成Alx(OH)y2+-P507有机配合物;当pH值为4.0～5.0时,Al(Ⅲ)沉淀为具有较多表面活性位点的絮状非晶Al(OH)3,使得P507的吸附去除效果较好;当pH值为6.0～6.5时,Al(Ⅲ)和Mg(Ⅱ)形成层状晶体Al(OH)3和MgAl2(OH)8,表面活性位点较少,使得P507吸附去除效果变差.此外,当Al/P摩尔比大于13、pH值为4.0～5.0时,Al(Ⅲ)和P507的去除率皆可达到98％以上,同时Mg(Ⅱ)的浓度损失仅为0.2％～0.9％.
Efficient removal of Al(Ⅲ)and P507 from high concentration MgCl2 solution based on in-situ reaction strategy
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 Alx(OH)yz+-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％.

in-situ removalAl(Ⅲ)P507MgCl2 solutionpHAl/P molar ratio

王强、王猛、冯宗玉、张永奇、黄小卫、薛向欣

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有研稀土新材料股份有限公司 稀土国家工程研究中心,北京 100088

东北大学冶金学院,沈阳 110819

北京有色金属研究总院,北京 100088

有研工程技术研究院有限公司,北京 101407

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原位除杂 Al(Ⅲ) P507 MgCl2溶液 pH Al/P摩尔比

National Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaGansu Province Science and Technology Major Special Project,China

2022YFB3504501522743559196221122ZD6GD061

2024

10.1016/S1003-6326(24)66594-5

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCD
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2024.34(9)
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