Synthesis and Application of Flocculants for Treatment of Ultra-fine Coal Slurry
ZHU Shu-quan
JIANG Lin-hua
ZOU Li-zhuang
Abstract：The flocculants play an important role in treatment and closed-circulation of ultra-fine coal slurry. The cationic modified starch macromolecule flocculants St-DMDAAC-AM was pre-pared by grafting dimethyldiallylammonium chloride (DMDAAC) and acrylamide (AM) onto starch, and its thermal stability and surface morphology were characterized by FTIR, DSC and SEM, respectively. The flocculation and filtration experiments with typical fine coal slurry were carried out and the treatment process was optimized. The characteristic peak of groups on IR spectrum shows the successful synthesis of St-DMDAAC-AM, and its high performance can be confirmed by results of DSC and SEM. The cationic flocculants play both roles of the charge neutralization and the formation of particle-polymer-particle bridges, and can effectively im-prove the effect of settlement and pressure filtration of ultra-fine coal. Under the optimized op-eration parameters, the concentration of thickener overflow is 2 g/L, the moisture of filter cake of thickener underflow is about 20%～25% and the concentration of filter liquid is less than 10 g/L.
Keywords：modified starchDMDAACAMSt-DMDAAC-AMfine coal slurry
Publication Date：2009-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 534-539 )