羟丙基淀粉接枝丙烯酰胺制备及其强化煤泥水沉降的作用机制#br#

doi:10.11799/ce202306030

Abstract

Abstract:

Hydroxypropyl starch copolymer (HPS-AM) was prepared by using ceric ammonium nitrate as initiator, hydroxypropyl starch (HPS) and acrylamide (AM) as raw materials through aqueous solution polymerization. The structure and morphology of synthetic HPS was characterized by infrared spectrum, scanning electron microscope and thermogravimetric analysis. The effects of flocculant dosage, stirring strength and pH value on the flocculation effect of coal slime water were investigated, and the comparative experiments of HPS-AM with PAM (500), PAM (1200) and polyaluminium (PAC) were carried out, the results show that the settlement effect is the best when the dosage of HPS-AM is 4 mL, the stirring intensity is 20 r.min-1 and the pH value is 8. After flocculation and sedimentation of coal slime water, the turbidity of supernatant is 24.69NTU and the floc compression rate is 99.90%; And the turbidity of supernatant is 83.81%, 77.25% and 80.07% lower than that of PAM (1200), PAM (500) and PAC respectively, and the floc compression rate is 0.18% higher than that of PAM (1200), PAM (500) and PAC. It is proved that HPS-AM is an excellent new flocculant for coal slime water.

CLC Number:

TD94

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Preparation of hydroxypropyl starch-grafted acrylamide and its mechanism of action to enhance coal slime water sedimentation

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