In this study, oxidized and sulfomethylated lignin (OSL) with the charge density of −4.4 meq/g was used as a dispersant for coal water slurry (CWS). The impact of the OSL on CWS having different particle sizes was fundamentally investigated. The size of particles greatly influenced the adsorption of OSL on coal particles and the rheology and stability of the CWS. The maximum adsorption of OSL was found to be 0.96 mg/g on coal A having the particle size of 22 μm (coal particles with smallest size). OSL improved the wettability of coal by 5–28%. The interfacial tension between coal particle and OSL was reduced from 17 mN/m to 13 mN/m, and the zeta potential of the suspension dropped from −30 mV to −47 mV when 0.96 mg/g of OSL was adsorbed on coal A. The addition of 64 mg/L of OSL to coal A suspension (50 wt%) reduced its viscosity from 1350 to 520 mPa·s. The stability of coal particles was also improved as the destabilization index of CWS was reduced from 4 to 0.2. These results confirmed that the OSL was an effective dispersant for the coal water slurry.

在这项研究中，电荷密度为-4.4 meq / g的氧化和磺甲基化木质素（OSL）被用作水煤浆（CWS）的分散剂。从根本上研究了OSL对具有不同粒径的CWS的影响。颗粒的大小极大地影响了OSL在煤颗粒上的吸附以及CWS的流变性和稳定性。发现OSL在具有22μm粒径的煤A（具有最小粒径的煤颗粒）上的最大吸附为0.96mg / g。OSL使煤的润湿性提高了5–28％。当0.96 mg / g的OSL吸附在煤A上时，煤颗粒与OSL之间的界面张力从17 mN / m降低到13 mN / m，悬浮液的ζ电势从-30 mV降低到-47 mV。向煤A悬浮液（50 wt％）中添加64 mg / L OSL使其粘度从1350降至520 mPa·s。煤颗粒的稳定性也随着CWS的失稳指数从4降低到0.2而提高。这些结果证实了OSL是用于水煤浆的有效分散剂。