Application and Mechanism Study of a Novel Copolymer for Filter Aids on Wet-Process Phosphoric Acid

Guang Chao Du; De Jun Fei; Jian Xun Wu; Ya Gu Dang; Yong Liu; Jie Xu

doi:10.4028/www.scientific.net/AMR.557-559.961

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 557-559Application and Mechanism Study of a Novel...

Application and Mechanism Study of a Novel Copolymer for Filter Aids on Wet-Process Phosphoric Acid

Abstract:

A novel copolymer PADA which has two functions of flocculation and surface activity was synthesized in aqueous solution. The copolymer was applied to filtration aiding on wet-process phosphoric acid (WPA). The results show that PADA can increase the filtration rate of the phosphoric acid slurry and decrease the moisture of the filter cake. The mechanism of filtration aiding was studied. PADA neutralizes the surface potential of the phosphogypsum and makes the microcrystal particles flocculate to conglobation, which indicate that electrostatic neutralization and flocculation might be the action modes in the process of filtration aiding. The shortest flocculation time and largest average diameter of floccules can be obtained with the addition of 10 ppm PADA. The average pore size and porosity of the filter cake are enlarged by 0.22 μm and 15.38% respectively with the addition of PADA. The surface contact angle of the phosphogypsum is increased by 3.4° with PADA presence.

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Periodical:

Advanced Materials Research (Volumes 557-559)

Pages:

961-967

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.557-559.961

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Online since:

July 2012

Authors:

Guang Chao Du, De Jun Fei, Jian Xun Wu, Ya Gu Dang, Yong Liu, Jie Xu

Keywords:

Electrostatic Neutralization, Filtration Aiding, Flocculation, Novel Copolymer, Wet-Process Phosphoric Acid

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