College of Mining Engineering, Taiyuan University of Technology
Tongling Nonferrous Metals Group Holding Co. , Ltd.

表面粗糙度对煤的可浮性起着重要作用。为了研究捕收剂和粗糙度协同作用对煤表面润湿性的影响,采用四种不同目数的砂纸对煤表面进行粗糙化处理,并使用粗糙度测量仪表征其表面特性。采用接触角与相互作用测量仪分析表面粗糙度对煤天然润湿性和油酸钠改性后润湿性的影响。结果表明,随着天然煤表面粗糙度的增加,接触角减小。由于接触线的增加,水滴与煤表面之间的扩散力增大。当粗糙度分别为0.32、1.02、1.82、2.38μm时,水与煤表面之间的扩散力分别为159.00、177.82、200.99、209.60μN。而经低浓度(120mg/L)油酸钠改性后,随着粗糙度的增加,煤表面的接触角增大,扩散力减小,扩散力分别为149.11、146.40、134.06、124.27μN。但当油酸钠浓度达到320mg/L时,随着粗糙度的增加,接触角反而迅速减小,扩散力迅速增大,扩散力分别为174.21、211.05、244.37、288.51μN。粗糙度的增大会增加天然煤表面的润湿性,低浓度的油酸钠改性和表面粗糙化可提高煤表面疏水性,然而,过量的药剂会增强煤表面的润湿性。

Surface roughness plays an important role in the floatability of coal. So the coal surface was roughened with four different grits of sandpaper and the surface properties were characterized by a roughness meter. A contact angle and interaction meter was used to analyze the effect of surface roughness on the wettability of coal with or without sodium oleate modification.The results show that the contact angle decreases as the surface roughness of natural coal increases. The diffusion force between water droplets and coal surface increases due to the increase of contact line. When the roughness is 0. 32, 1. 02, 1. 82, and 2. 38 μm, the diffusion force between water and coal surface is 159. 00, 177. 82, 200. 99, and 209. 60 μN, respectively.Whereas, after modification with low concentration ( 120 mg/ L) of sodium oleate, the contact angle of the coal surface increases with the increase of roughness, and the diffusion force decreases, and the diffusion force is 149. 11, 146. 40, 134. 06, and 124. 27 μN. However, when the concentration of sodium oleate reaches 320 mg/ L, the contact angle decreases rapidly with the increase of roughness, and the diffusion force also increases rapidly, and the diffusion force is 174. 21, 211. 05, 244. 37, and 288. 51 μN, respectively.The increase of roughness enhances the coal wettability, and low concentrations of sodium oleate modification and surface roughening can increase the hydrophobicity of the coal surface, however, too much of the agent will increase the wettability of the coal surface again.

国家自然科学基金项目(52204275,51820105006,52074189);山西省回国留学人员科研资助项目(2022-059)

熊 鹏, 董宪姝, 叶贵川, 等. 粗糙度对贫瘦煤表面润湿性的影响 [J]. 煤炭工程, 2024, 56(3): 197-204.