Study of sodium lignosulfonate prepare low-rank coal-water slurry: Experiments and simulations

Experimental and computational studies of polycarboxylate dispersant effect on the properties of low‐rank coal water slurries

“…MD simulation was employed to track and provide deeper insight into the adsorption behavior of PC on the surface of the coal particles. 27 The adsorption process of PC on coal is shown in Figure 9. In a dense CWS, the distance between the unadsorbed dispersant and the surface of the coal particles is very short at the initial stage of CWS preparation.…”

“…The D values of the systems before and after PC adsorption are 7.27 (±0.26) Â 10 À5 cm 2 /s and 5.62 (±0.28) Â 10 À5 cm 2 /s, demonstrating the lower mobility of water molecules after the adsorption of PC. 27 Based on the adsorption mode of PC on 72 # coal shown in Figure 10, most of the hydrophilic groups of PC (including -COO À and -SO 3 À ) direct toward the bulk solution. This means that the 72 # coal particles exhibit improved hydrophilicity after the adsorption of PC.…”

Slurryability and Influencing Mechanism of Hydrophobic Structures in Additive–Coal–Water Ternary System

“… 10 , 11 Electrostatic repulsion is provided by the charges on the coal surfaces, which disperses the coal particles and improves the stability of the slurry. 12 , 13 The nonuniformity of coal surface structures is not beneficial to slurryability; therefore, additives are used in CWS to improve this situation. The hydrophobic structure of the additives is adsorbed onto coal surfaces and links to the water molecules through the hydrophilic end, which makes the wettability of the coal surfaces more uniform.…”

“…The properties of CWS are influenced by the physical and chemical properties of the coal surfaces, such as their oxygen-containing functional groups, electric charges, hydrophilicity, inherent moisture, and pore structure. , Additives are reversely adsorbed on coal surfaces because of the presence of oxygen-containing functional groups. This results in nonuniform adsorption of additives on the coal surfaces, which influences slurry performance. , Electrostatic repulsion is provided by the charges on the coal surfaces, which disperses the coal particles and improves the stability of the slurry. , The nonuniformity of coal surface structures is not beneficial to slurryability; therefore, additives are used in CWS to improve this situation. The hydrophobic structure of the additives is adsorbed onto coal surfaces and links to the water molecules through the hydrophilic end, which makes the wettability of the coal surfaces more uniform.…”

Effect of bio-based surfactant on wettability of low-rank coal surface and its mechanism

“…Yan et al (Yan &Huang 2020) studied the dehydration of fine LRC by using a method of compounding inorganic salts and surfactants and observed that the existence of surfactants improved the surface wettability of LRC. Li et al (Li et al 2021a, Li et al 2021b) used a surfactant as a dispersant to study the paddle characteristics of LRC water slurry and observed that the wettability of LRC surface changed after the addition of the surfactant. Liu et al (Liu et al 2020) found the wettability change of a LRC surface after adding fatty alcohol polyoxyethylene ether carboxylate (AEC) using molecular simulation and experiment and observed that after adding the surfactant, its wettability decreased at first and then increased with the concentration of the surfactant.…”