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

研究了酸－碱脱灰处理对鹤壁、淮南和靖远煤的有机组成、表面性质以及成浆性的影响。结果表明，酸－碱脱灰处理后煤质特性都发生了明显变化。主要表现在灰分下降，水分增加，挥发分降低，总碳量和芳香碳增加；氧的质量分数下降，酚羟基氧质量分数增加；硫的质量分数降低。酸－碱脱灰处理后煤的成浆性明显变差，在煤粒度分布、分散剂种类和用量相同时，脱灰处理使鹤壁、淮南、靖远三种煤成浆的定黏（1 000 mPa·s）浓度，分别比相应原煤下降了4.6%，6.6%和4.4%。进一步研究表明，经酸－碱脱灰处理，上述3种煤对所用4种分散剂的吸附量都明显增加，煤粒的Zeta电位也明显增加。酸－碱脱灰处理使研究用煤的成浆性变差，主要是由于煤的有机组成和表面性质变化引起的。

Interaction characteristics between different CWS dispersants and coals Ⅶ Properties variation of acid-base deashed coals and their effect on the slurryability

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.