NaOH处理对褐煤吸水性能的影响  

Effect of NaOH treatment on Water Sorption of Lignite

作　　者：王新华[1] 冯莉[1] 刘祥春[1] 张营[1] 张曼[1] 

机构地区：[1]中国矿业大学化工学院,江苏徐州221116

出　　处：《实验室研究与探索》2013年第4期4-6,10,共4页Research and Exploration In Laboratory

基　　金：国家重点基础研究发展计划(863)项目(2012CB214900);国家自然科学基金(51274197);中央高校基本研究基金(2010LKHX07)

摘　　要：为了提高褐煤的品质,改善其应用性能,采用NaOH溶液对锡林浩特白音华褐煤(XL)和神东褐煤(SD)进行处理。利用接触角测定仪表征了原煤和处理后煤样的表面润湿性;复吸水实验及不同相对蒸汽压下的平衡含水量表征了原煤和处理煤的持水性能,并通过测定碱溶物的含氧官能团种类和含量,分析了NaOH处理前后褐煤持水性能改变的原因。研究结果表明:NaOH处理使XL和SD接触角分别增加了35.8°和43.7°,煤样的疏水性能增强;碱溶解破坏了煤中的含氧官能团,使煤样复吸水能力减弱,从而达到了提质的目的。另外,NaOH处理对煤的平衡含水量影响随着相对蒸汽压的变化而变化。There is abundance of lignite resources in China. However, lignite is not widely used due to its high water content, easy and spontaneous combustion, and relapse. In order to improve the quality of lignite and its application performance, Xilinhot Baiyinhua lignite （XL） and Shendong lignite （SD） were treated by NaOH solution in this study. The wettabilities of treated coal and raw coal were characterized by contact angle measurement instrument while the water-holding capacities were analyzed by re-adsorption water contents experiment and equilibrium water contents across a range of relative vapor pressure. Furthermore, the reason for the change of water-holding capacity of the lignite was analyzed by measuring the amount of oxygen-containing functional groups of alkali-soluble part. The results show that the contact angle of XL and SD coal samples are increased by 35.8 ℃ and 43.7 ℃ , respectively, after treated with NaOH. The water re-absorption contents of treated lignite are attributed to the reduction of oxygen-containing functional groups in coal samples after NaOH treated. NaOH treatment is an efficient method for reducing the ability of water re-sorption in lignite. In addition, the equilibrium moisture contents of all samples depend on the change of the relative vapor pressures.

关 键 词：褐煤 NaOH处理 复吸水 

分 类 号：TQ531.1[化学工程—煤化学工程]