Research On Preparation And Properties Of Poly-silicate Aluminum Sulfate (PSAS)

Flocculation is the most widely adopted and more inexpensive method in wastewater treatment. The flocculation is directly influenced by character of flocculants. So it is very important to study a newly high-effective flocculant.The paper summarized the research and development of flocculants, particularly introduced inorganic flocculants, and emphasized the development of composite inorganic poly-silicate aluminum sulfate(PSAS).In this paper synthesize of PSAS was to add Al2(SO4)3 to poly-silicic acid at room temperature. We firstly reviewed factors of synthesize including pH of Na2SiO3, mass fraction of SiO2 and temperature influenced the silicic acid; Na2SiO3 /Al2(SO4)3(molar ratio) of raw material, and B influenced the effect and stability of PSAS; the time of reaction affected PSAS. Then we synthesized some factors with crosscut experiments, then gained the optimum conditions of PSAS of synthesize.We tokened PSAS flocculant with IRand XRD, then analyzed its structure. We also made effect experiments with polysilicic acid and Al2(SO4)3 separately comparing with PSAS. We made a conclusion that polysilicic acid and Al2(SO4)3 had an interaction that strengthens the properties of flocculation. We also provided the essential theory bases of widening the application.Flocculation tests were performed by using a synthetic suspension containing kaolinite. We were able to change the size of kaolinite particles, concentration of suspension, pH and temperature of synthetic suspension, the conditions of beating up. We measured the effect of PSAS, then analyzed and study these factors that they had effects on PSAS. In the end, we took some pictures of the process that PSAS deal with wastewater.