摘要
通过测定不同粒级镜质组和惰质组在二次去离子水中的浸湿热,分析了低变质烟煤有机显微煤岩组分的表面润湿性.结果表明:镜质组和惰质组均具有天然亲水性,润湿自发进行;镜质组的亲水性更强.结合煤岩组分的工业和元素分析、XPS分析及漫反射红外光谱分析认为:高含氧量和羟基基团是引起镜质组亲水性更强的决定因素;随粒度减小,有机煤岩组分的理论疏水性增强,其中镜质组的变化更显著;表面润湿性的差异是浮选分离煤岩组分的基础,但随着粒度减小,镜质组和惰质组的润湿性差别减小,煤岩组分浮选分离的选择性降低,分离难度增加.
The specific wetting heats of different size vitrinite and inertinite in secondary deionized water were measured by micro-calorimeter, and surface wettability of malerals from low rank bituminous was analyzed. The resuits show that both vitrinite and inertinite from low rank bituminous are naturally wettable in water, the wetting phenomenon is spontaneous and the vitrinite is more hydrophilic than the inertinite. Based on the wetting heat measurements, proximate and ultimate analysis, defuse reflectance fourier-transformed infrared and X-ray photoelectron spectroscopy, it can be concluded that higher oxygen and hydroxyl content results in higher hydrophilicity of virtinite, which is related to low eoalification degree and lower ash content of inertinite. The theoretical hydrophobicity of parent coal, vitrinite and inertinite is shown to decrease with particles size decreasing, especially of vitfinite. Wettability difference between vitfinite and inertinite is the foundation of floatation. Whereas, hydrophilicity difference between vitrinite and inertinite in coarser size fractions is much higher than the finer fractions i. e. , selective flotation of vitrinite and inertinite become more difficult at finer particle size.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2009年第2期243-246,共4页
Journal of China Coal Society
基金
国家自然科学基金重大研究计划资助项目(90210014)
