Study On The Modification Of Lignin Used As Additive Of CWS

When used as an additive to coal water slurry (CWS), lignin has the shortcomings of low concentration and high ignition point. To solve these problems, in this article, lignin sodium was used as a raw material to find out the optimum process to make additives, such as aminated lignin condensated sulfonated naphthalene (LCSN), aminated lignin-polystyrene-acrylic (LPSA) and aminatd lignin-polystyrene-maleic anhydride (LPSM). Compared with raw material, LCSN had increased Mn, no capillary substance. Its critical micelle concentration(CMC) decreased by0.035mol/ML, and hydrophile-lyophile balance (HLB) by0.5.When using the same dosage, compared with raw material, concentration of lignite CWS used LCSN as an additive increased by4.1%,which reached the same concentration of CWS as Naphthalene dispersants. Compared with raw lignin, M,, of LPSA was increased. CMC and HLB of LPSA reduced by0.0170mol/mL and1.49respectively. The concentration of lean coal and coke CWS of LPSA as additive was increased by3.0%. Compared with the ignition point of raw coal, CWS of material and CWS of naphthalene dispersants, that of CWS of LPSA as additive reduced13.31℃,7.43℃and13.61℃respectively. Predictably, the modified lignin not only made full use of resources, but also reduced the cost of coal water slurry additive.