Journal of MMIJ
Online ISSN : 1884-0450
Print ISSN : 1881-6118
ISSN-L : 1881-6118
論文
イオン交換樹脂によるリン酸廃液中のAlおよびMoの除去
芝田 隼次城崎 有孝大村 友希村山 憲弘柏井 俊彦村田 貢
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2009 年 125 巻 6_7 号 p. 358-362

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Waste H3PO4 solution containing Al and Mo is discharged from a liquid crystal display production process. The discharged amount of waste acid solution, for example, reaches about 3,000 ton/year at one factory. Neutralization and activated sludge methods have been used for the waste acid solution. From the viewpoint of environment and resources recycling, it is important to recover and recycle H3PO4 from the waste acid solution. Separation technologies such as solvent extraction, electrodialysis and ion exchange resin methods, may be used to remove metal ions from the waste acid solution and regenerate H3PO4.
In this study, the removal of Al and Mo in the waste H3PO4 solution by ion exchange resin was investigated. It was found that the ion exchange resin method is useful to remove Al and Mo in the H3PO4 solution. The waste H3PO4 solution was diluted by 5 times and then, Al ions were captured by H+ type cation exchange resin in the cation exchange step and next Mo ions were captured by OH- type anion exchange resin in the anion exchange step. These experiments were carried out using an ion exchange resin column of φ 20mm and 410mm height. From the breakthrough curve of Al ions, it is possible to feed the H3PO4 solution by 14.4 times as large as the bed volume of cation exchange resin before reaching the breakthrough point if the flow rate represented by SV is set to be 5. For Mo removal, the H3PO4 solution can be fed by 6 times as large as the bed volume of anion exchange resin.

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© 2009 The Mining and Materials Processing Institute of Japan
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