水煤浆制备过程中浆体抗搅拌性能的研究

STIR-RESISTING PROPERTIES OF COAL WATER SLURRY AND THEIR EFFECT ON SLURRY PREPARATION

选用两种不同类型的分散剂，考察了１１种不同变质程度煤在高浓度煤浆制备过程中的浆体抗搅拌性能。发现高浓度煤浆制备对应的最佳搅拌强度不仅与分散剂的种类有关，而且取决于煤的变质程度。浆体抗搅拌性能随制浆用煤的变质程度的提高而增强，从而使较高变质程度煤的高浓度煤浆制备需在较高的搅拌强度下进行，才能最大限度地提高煤的成浆性。相关分析表明，煤表面分布的羧基、酚羟基等亲水性基团对浆体抗搅拌性会产生重要影响，煤表面此类基团的含量较高或吸水性较强时可使高浓度煤浆制备的最佳搅拌强度大幅度降低。

The stir-resisting properties of coal water slurries during their preparations were investigated in detail with 11 Chinese coals and two types of dispersants. The results indicated that the stir-resisting properties represented by the optimum stirring strength for slurry preparation are dependent on both coal surface properties determined by coal rank and the used dispersant. For a given type of dispersant, the stir-resisting capability of slurry becomes stronger with increasing coal rank. The preparation of highly loaded coal water slurry with high-rank coals should be, therefore, carried out at a high stirring strength. Reactive oxygen- bearing functional groups, such as carboxyl and phenolic hydroxyl groups, on coal surface play an important role in determination of slurry stir-resisting properties during slurry preparation. High content of such hydrophilic groups or high moisture-holding capacity of coal greatly weakened slurry stir-resisting capability. thus the optimum stirring strength for slurry preparation is notably decreased.