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在矿业、陶瓷和化学工业的许多过程中,固-液之间的接触角是一个非常重要的参数。更为重要的是,通过表面活性剂调节接触角大小在矿物泡沫浮选过程中起着非常重要的作用。对平的固体表面可以直接测定接触角,但是,无法由浮选过程中遇到的细粒分散的颗粒获得这种平的表面。而用像沉积在玻璃片上薄层粉末或充填柱可以测定表观接触角。为了代替这些方法,本文提出了一种新的测量固体颗粒后退接触角的方法,并将其结果与用窄粒级锆石所进行的柱吸试验和微量浮选试验结果进行比较。该方法是以滤饼毛细管脱水作为依据,它是一个快速而简单的试验方法。试验结果证明,本方法是可靠的,无论有无表面活性剂润湿的情况下,测出的接触值吻合很好。
In many processes in the mining, ceramics and chemical industries, the contact angle between solid and liquid is a very important parameter. More importantly, adjusting the contact angle with surfactants plays a very important role in mineral froth flotation. The contact angle can be measured directly on a flat solid surface, however, this flat surface can not be obtained from the finely divided particles encountered during flotation. Apparent contact angles can be determined using thin layers of powder or packed columns such as those deposited on glass plates. In order to replace these methods, a new method for measuring the receding contact angle of solid particles is proposed in this paper. The results are compared with the results of the column suction test and the trace flotation test conducted with narrow-graded zircon. This method is based on filter cake capillary dehydration, which is a quick and easy test method. The test results show that this method is reliable, with or without surfactant wetting, the measured contact values agree well.