不同煤种接触角及润湿性规律探究
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摘要
为了确定粗糙度、表面活性剂以及变质程度对煤表面疏水性和润湿性的影响,选用5种不同变质程度的煤,测定了不同表面粗糙度煤样的表面接触角。并采用OWRK法理论模型计算不同变质程度、不同粗糙度煤的表面能。结果表明,粗糙度会影响煤表面的疏水性和润湿性,试验表明所选用的砂纸目数越小,煤样表面所测得接触角值越小,疏水性越差,煤表面能越大。不同表面活性剂对不同变质程度煤表面的润湿能力不同,对于褐煤和气煤,SDBS的润湿性最好,随着变质程度的增加,OP-10的润湿性较好;同一表面活性剂的不同浓度溶液,表面张力越小,润湿性越强;表面活性剂浓度在接近临界胶束浓度(CMC)时润湿效果较好。
In order to determine the influence of roughness, surfactant and degree of metamorphism on coal surface hydrophobicity and wettability, surface contact angles of coal samples with different surface roughness were measured. The surface energy of coal with different degree of metamorphism and different roughness was calculated by OWRK theory model. The results show that the roughness will affect the hydrophobicity and wettability of the coal surface. The results show that the smaller the number of sandpaper is, the smaller the contact angle is, the worse the hydrophobicity is, and the larger the surface energy of coal. The wetting ability of different surfactants was different for different metamorphic coal surface. For lignite and gas coal, the wettability of SDBS is the best, with the increase of the degree of metamorphism, the wettability of OP-10 is better; Different concentrations of the same surfactant solution, the smaller the surface tension, the stronger the wettability,and the wetting effect was the best when the concentration of surfactant was close to critical micelle concentration(CMC).
In order to determine the influence of roughness, surfactant and degree of metamorphism on coal surface hydrophobicity and wettability, surface contact angles of coal samples with different surface roughness were measured. The surface energy of coal with different degree of metamorphism and different roughness was calculated by OWRK theory model. The results show that the roughness will affect the hydrophobicity and wettability of the coal surface. The results show that the smaller the number of sandpaper is, the smaller the contact angle is, the worse the hydrophobicity is, and the larger the surface energy of coal. The wetting ability of different surfactants was different for different metamorphic coal surface. For lignite and gas coal, the wettability of SDBS is the best, with the increase of the degree of metamorphism, the wettability of OP-10 is better; Different concentrations of the same surfactant solution, the smaller the surface tension, the stronger the wettability,and the wetting effect was the best when the concentration of surfactant was close to critical micelle concentration(CMC).
引文
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[2]赵振国.接触角及其在表面化学研究中的应用[J].化学研究与应用,2000,12(4):370-374.
[3]张晨光,王启宝,任守政.表面活性剂在煤浮选中的促进作用与机理[J].煤炭加工与综合利用,1996(2):31-33.
[4]沈笑君,刘元晖.表面活性剂在煤浮选中应用研究[J].中国矿业,2009,18(8):82-83,87.
[5]孙艳萍.表面活性剂应用于煤浮选中的研究[J].煤炭技术,2012,31(2):111-112.
[6]马克玉,宋书宇,樊民强.表面活性剂SPAN80对煤泥浮选促进作用的试验研究[J].选煤技术,2011(4):9-12,81.
[7]郭晓华,蔡卫,马尚权,等.表面活性剂在煤矿防降尘中的应用实验[J].矿业安全与环保,2010,37(3):27-30.
[8]QINGZHAO LI,LIN BAIQUAN,SHUAI ZHAO,et al.Surface physical properties and its effects on the wetting behaviors of respirable coal mine dust[J].Powder Technology,2013,233(1):137-145.
[9]黄维刚,胡夫,刘楠琴.表面活性剂对煤尘湿润性能的影响研究[J].矿业安全与环保,2010,37(3):4-6.
[10]曾康生,胡乃联,程卫民,等.综放工作面润湿剂喷雾降尘机理及高效降尘润湿剂的试验[J].煤炭学报,2009,34(12):1675-1680.
[11]Owens D K,Wendt R C.Estimation of the surface free energy of polymers[J].Journal of Applied Polymer Science,1969,13(8):1741-1747.
[12]郭梦熊,霍卫东,安征,等.不同挥发分煤的浮选理论与实践[J].煤炭科学技术,1999(01).