煤沥青甲苯不溶物测定方法的改进

Improving the Determination Method of Toluene Insolubles in the Coal Tar Pitch

通过试验,分析了制样方法、试验砂品种、试剂等对煤沥青甲苯不溶物测定结果的影响,从实践的角度,对GB/T2292-1997规定的方法提出了改进:在制样方法上,采用高速万能粉碎机代替手工研磨,提高了样品粒度的分散性和均匀性;在试验砂的选择和应用上,对普通砂和石英砂做了对比试验和数据分析,提出了相应的改进措施:在试剂的选择上,强调了甲苯试剂质量对试验结果的影响。通过以上改进措施,可提高煤沥青甲苯不溶物检测的准确度和精密度。

Test was made to show such factors that caused the impact on the determination of the toluene insolubles in the coal tar pitch, which include the method of sample preparation; variety of the testing sand; reagent, etc. Improve- ment was suggested on the method specified in the GB/T2292-1997 regulations. For the sample preparation method, high speed kibbler was suggested instead of hand lapping; thus, the dispersibility and uniformity of the sample granularity was enhanced. Comparison test was made and parameters were analyzed on the common sand and the quartz sand with reference to the selection and application of the test sand, in addition, corresponding improvement was suggested. On the part of reagent selection, emphasis was laid on the effect of toluene quality against the test result. The aforementioned improvement can increase the determination accuracy of the toluene insolubles in the coal tar pitch.