Abstract Previous studies verified that the moisture adsorption on the lignite can be reduced by adsorption of surfactant on the surface. However, these surfactant adsorption processes were realized in aqueous solutions, result in a great deal of water bring into the system. It seems that the surfactant is affinity to the surface of lignite and the adsorption can be realized in dry condition with a well-designed method. In this study, we propose a method to reduce the adsorption of moisture by lignite in dry condition, by mechanically mixing it with a surfactant in a ball mill. The surfactant is adsorbed by the lignite surface toward due to the electrostatic interactions during the mixing process, which makes the lignite surface hydrophobic. Untreated and treated samples of lignite were exposed in an environment of 100% relative humidity, maintained at 20 °C, for 36 h. Compared to the untreated sample, the moisture content in the treated sample decreased from 25.9% to 11.6%. This reduction in the adsorbed moisture content is due to the modification of the hydrophobicity of the original sample. The particle size of the lignite decreases significantly after ball milling. As the particle size required for the commercial utilisation of lignite is usually low, the proposed method can be applied after the dry beneficiation process.

中文翻译：

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使用机械混合在干燥条件下通过褐煤吸附表面活性剂的方法

摘要 前期研究证实，通过表面吸附表面活性剂可以减少褐煤对水分的吸附。然而，这些表面活性剂吸附过程是在水溶液中实现的，导致大量的水带入系统。表面活性剂似乎对褐煤表面具有亲和性，通过精心设计的方法可以在干燥条件下实现吸附。在这项研究中，我们提出了一种减少褐煤在干燥条件下吸附水分的方法，通过在球磨机中将其与表面活性剂机械混合。由于混合过程中的静电相互作用，表面活性剂被褐煤表面吸附，使褐煤表面疏水。未经处理和处理过的褐煤样品暴露在 100% 相对湿度的环境中，保持在 20°C，36 小时。与未经处理的样品相比，经处理的样品中的水分含量从 25.9% 下降到 11.6%。吸附水分含量的减少是由于原始样品疏水性的改变。球磨后褐煤的粒径显着减小。由于褐煤的商业利用所需的粒度通常较低，因此所提出的方法可在干选工艺之后应用。