School of Resources and Safety Engineering,China University of Mining and Technology( Beijing) National Key Lab
of Coal Resources and Safety Mining,China University of Mining and Technology( Beiing)

为了增强井下防尘管路中水的润湿性,利用磁化仪和高斯计对不同水样进行了磁处理,研究分析了不同场强及磁化时间下外加磁场对水样表面张力的影响程度及特征,并与表面活性剂的试验情况进行了比较。结果表明:一定磁场参数下,外加磁场能够降低水的表面张力,但对其影响程度相对较小。具有较高初始表面张力的水样被磁处理后,平均表面张力一般为50~60 m N/m,降低了7.2%~27.1%,且随磁场参数的改变有一定的波动;而使用表面活性剂在较低浓度下就可使水的表面张力降低至50 m N/m以下,最佳表面活性剂可使其进一步降低至30~40 m N/m,降低幅度可为外加磁场的1.5~4.0倍以上。外加磁场可以作为一种改变水润湿性的绿色方法,但应根据现场具体条件及需求,并结合磁化水其他特性的研究进行选择应用。

In order to enhance the wetting ability of water in the dust prevention pipeline underground,a magnetizer and digital gauss meter were applied to magnetize different water samples. The influence degree and features of external magnetic field on water's surface tension were analyzed under the different magnetic field intensity and magnetized time, and a comparison was conducted between external magnetic field and surfactant. The results showed that under the certain magnetic field parameter s,external magnetic field could reduce water's surface tension,but its influence degree was relatively small. After the water with a high initial surface tension was magnetica lly treated,the average surface tension would be 50 ~ 60 m N 1 m generally,could reduce the original value by 7. 2% - ~ 27. 1%,and with the magnetic field parameters varie d,there would be certain wave variation. Under the low concentration,the surfactant could make the water's surface tension reduced below 50 m N/ m,the best surfactant C ould further reduce the surface tension to 30 ~ 40 m N 1 m and the decreasing range would be 1. 5 ~ 4. 0 times as compared with the magnetized water. External magnetic field could be a green method to change the wetting ability of water,but it should be applied according to site specific requirements and in combination with other features 0 f the magnetized water.

中央高校基本科研业务费专项基金资助项目(2009KZ03)；