不同水煤浆分散剂与煤之间的相互作用规律研究 Ⅶ 酸碱脱灰处理煤的性质变化及其对成浆性的影响

The effects of acid-base deashing treatment on the organic constituents, surface properties and slurryability of Hebi, Huainan, and Jingyuan coals have been studied. The results show that many properties of coal are changed by deashing treatment. The content of ash, volatile, sulfur and oxygen of the acid-base treated coals decreases compared with that of the raw coal. However, the content of moisture, phenolic hydroxyl oxygen, total and aromatic carbon in the treated increases. The slurryability of coal is weakened by acid-base treatment. Under the given conditions of coal particles distribution, additive and its dosage, as compared with raw coal, the CWS concentration under the viscosity of 1 000 mPa·s decreases by 4.6%, 6.6% and 4.4% for Hebi, Huainan and Jingyuan coals, respectively. The adsorption amounts of different dispersants on the deashed coals and Zeta potentials increase. Evidently, the lower slurryability of the acid-base treated coals is mainly due to the change of organic constituents and surface properties of the coals.