Improving Gypsum Slurry Filtration in the Production of Phosphoric Acid by Adding Cationic Amphiphilic Copolymer

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

doi:10.4028/www.scientific.net/AMR.550-553.919

Paper Titles

Studies on the Modification of Polypropylene for the Detection Cable
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Preparation and Hygroscopic Property of the Polyacrylamide/MgCl₂ Hybrid Hydrogel
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Extracting Plasticizer from Polyvinylbutyral Plastics by Supercritical Fluid
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Study on the Thermal Degradation Behaviors of the Sheath and Insulation Materials of FR-PVC Cables
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Improving Gypsum Slurry Filtration in the Production of Phosphoric Acid by Adding Cationic Amphiphilic Copolymer
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Study of a Real Fluid Flow Axial Symmetry in a Cylindrical Cavity
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Study on Thermal Reduction of Phosphate Ore by Carbon in the Fluidized Bed Reactor
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Effect of Adding Pump-Around Circuits and Reducing Stripping Steam Flow Rate on the Improving Energy Efficiency and Increasing Processing Capacity of the Atmospheric Column
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Effect of Adjusting Feed Thermal Conditions on the Capacity of Complex Distillation Columns
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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 550-553Improving Gypsum Slurry Filtration in the...

Improving Gypsum Slurry Filtration in the Production of Phosphoric Acid by Adding Cationic Amphiphilic Copolymer

Abstract:

A cationic amphiphilic copolymer was synthesized with acrylamide (AM), dimethyl diallyl ammonium chloride (DMDAAC), monomer B by solution copolymerization. Through the orthogonal test, the optimum synthesis condition was obtained as follow: the solid content of the polymerization system is 10%, the pH value is 4.0, the polymerization temperature is 60°C, the concentration of the initiator is 0.06%, and the monomer ratio of m (AM): m (DMDAAC): m (monomer B) is 70:10:20. The copolymer was used for the filtration aiding in the wet process phosphoric acid. The filtration rate of the gypsum slurry is increased by 4.8 times, and the filter cake moisture is reduced by 11.79%, with the addition of PADB. The mechanism of filtration aiding was also researched, which shows that PADB can change the mean diameter of crystals and agglomerate the tiny crystals; PADB can decrease the surface tension of the filter liquor and enhance the hydrophobicity of the gypsum.