Manufacture Technology of Monoammonium phosphate from LCD Waste Acid 


Vol. 15,  No. 4, pp. 253-257, Dec.  2009


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  Abstract

The waste solution discharged form the LCD(Liquid Crystal Display) manufacturing process contains phosphoric acid, nitric acid, acetic acid and metal ions such Al and other impurities. In this study, vacuum evaporation and diffusion dialysis was developed to commercialize an efficient system for recovering the high-purity phosphoric acid and manufacturing monoammonium phosphate. By vacuum evaporation, almost 99% of nitric and acetic acid was removed. Also, by diffusion dialysis, about 97.5% of Al was removed. Monoammonium phosphate was manufactured from purified phosphoric acid and ammonium hydroxide. In order to get the optimum manufacturing condition, the molar ratio of ammonium hydroxide and phosphoric acid, pH and temperature was controlled. Using this optimum condition, we obtained the recovery rate of monoammonium phosphate of about 90%.

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  Cite this article

[IEEE Style]

L. HY, L. SG, P. SK, K. JH, K. JY, K. JY, "Manufacture Technology of Monoammonium phosphate from LCD Waste Acid," Clean Technology, vol. 15, no. 4, pp. 253-257, 2009. DOI: .

[ACM Style]

Lee HY, Lee SG, Park SK, Kim JH, Kim JY, and Kim JY. 2009. Manufacture Technology of Monoammonium phosphate from LCD Waste Acid. Clean Technology, 15, 4, (2009), 253-257. DOI: .

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pISSN : 1598 - 9712
eISSN : 2288 - 0690

한국연구재단 등재학술지