微细粒辉钼矿疏水聚团及聚团浮选研究
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摘要
为了解决微细粒辉钼矿难以通过传统浮选回收的难题,以煤油为添加剂,以聚团粒度与规则度为表征手段,探讨微细粒辉钼矿疏水聚团过程中聚团的形成、破坏和重组形为,并在此基础上研究了聚团对微细粒辉钼矿浮选效果的影响。结果表明:聚团的形成与搅拌速度和煤油用量密切相关;搅拌速度越高,聚团形成越快;煤油用量可以显着提高聚团强度,以承受高应力剪切,煤油用量越高,使得聚团破碎和重组所需要的搅拌速度越大,时间越长;聚团规则度受搅拌速度和煤油用量影响非常明显,搅拌速度越大,煤油用量越大,聚团变得越规则。与常规浮选相比,聚团浮选使得微细粒辉钼矿的上浮率显著提高,聚团浮选效果与疏水聚团过程中搅拌强度紧密相关,搅拌速度越高,达到最大上浮率所需时间越短,添加煤油能够显著提高辉钼矿上浮率。
In order to resolve the problem that molybdenite is difficult to be recovered through conventional flotation,The growth,breakage and restructuring of the agglomerates was investigated thoroughly through characterization of agglomerate size and fractal dimension,and based on hydrophobic agglomeration,the flotation of agglomerated molybdenite fines was conducted. The results shown that the growth of agglomerate depended on the stirring speed,the higher the stirring speed,the stronger was the stirring strength,more rapidly the agglomerate grown. In addition,kerosene dosage could increase the agglomerate strength remarkably to withstand high stress shear,the higher the kerosene dosage,stronger stirring strength and less time was need to cause the breakage and restructuring of the agglomerates. The average fractal dimension of agglomerates was strongly affected by stirring speed and kerosene dosage,the higher the stirring speed,the larger the kerosene dosage,more regular the agglomerates. Compared to conventional flotation,floc-flotation increased the floatability of molybdenite substantially. The floc-flotation of molybdenite fines closely correlated with the strength of mechanical conditioning in hydrophobic agglomeration,the higher the stirring speed,less time was needed to achieve the maximum floatability. Kerosene could increase the floatability of agglomerate significantly.
In order to resolve the problem that molybdenite is difficult to be recovered through conventional flotation,The growth,breakage and restructuring of the agglomerates was investigated thoroughly through characterization of agglomerate size and fractal dimension,and based on hydrophobic agglomeration,the flotation of agglomerated molybdenite fines was conducted. The results shown that the growth of agglomerate depended on the stirring speed,the higher the stirring speed,the stronger was the stirring strength,more rapidly the agglomerate grown. In addition,kerosene dosage could increase the agglomerate strength remarkably to withstand high stress shear,the higher the kerosene dosage,stronger stirring strength and less time was need to cause the breakage and restructuring of the agglomerates. The average fractal dimension of agglomerates was strongly affected by stirring speed and kerosene dosage,the higher the stirring speed,the larger the kerosene dosage,more regular the agglomerates. Compared to conventional flotation,floc-flotation increased the floatability of molybdenite substantially. The floc-flotation of molybdenite fines closely correlated with the strength of mechanical conditioning in hydrophobic agglomeration,the higher the stirring speed,less time was needed to achieve the maximum floatability. Kerosene could increase the floatability of agglomerate significantly.
引文
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[]Song S,Lopez Valdivieso A,Ding Y.Effects of nonpolar oil on h drophobic flocculation of hematite and rhodochrosite fines[J].Powder Technology,1999,101(1):73-80.
[10]Song S,Lopez Valdivieso A,Reyes Bahena J L,et al.Hydrophobic flocculation of sphalerite fines in aqueous suspensions induced by alkyl xanthate[J].Colloids and Surfaces A:Physicochemical and Engineering Aspects,2001,181(1-3):159-169.
[11]Song S,Lopez Valdivieso A,Reyes Bahena J L,et al.Floc flotation of galena and sphalerite fines[J].Minerals Engineering,2001,14(1):87-98.
[12]Lu S,Guo J.Kinetics of coagulation of fine mineral particles in a stirred tank[J].Colloids and Surfaces A,1994,84(2/3):195-204.
[2]Yang B,Song S,Lopez Valdivieso A.Effect of particle size on the contact angle of molybdenite powders[J].Mineral Processing and Extractive Metallurgy Review,2014,35(3):208-215.
[3]Castro S H,Mayta E A.Kinetics approach to the effect of particle size on the flotation of molybdenite[C].4th Meeting of the Southern of the Hemisphere on Mineral Technology and III Latin American Congress on Froth Flotation.Concepción,Chile,1994.
[4]何桂春,王玉彤,康倩.纳米技术在微细粒矿物浮选中的应用[J].有色金属科学与工程,2015,6(2):57-62.He Guichun,Wang Yutong,Kang Qian.Application of nanotechnology in micro-fine mineral flotation[J].Nonferrous Metals Science and Engineering,2015,6(2):57-62.
[5]邓立佳,代淑娟,宿少玲,等.某低品位微细粒金矿石浮选试验研究[J].矿冶工程,2017,37(1):31-33.Deng Lijia,Dai Shujuan,Su Shaoling,et al.Experimental study on flotation of lean untrafine-grained gold ore[J].Mining and Metallurgical Engineering,2017,37(1):31-33.
[6]Trahar W J.A rational interpretation of role of particle size in flotation[J].International Journal of Mineral Processing,1981,8(4):289-327.
[7]George P,Nguyen A V,Jameson G J.Assessment of true flotation and entrainment in the flotation of submicron particles by fine bubbles[J].Minerals Engineering,2004,17(7/8):847-853.
[8]Liu Q,Wannas D,Peng Y.Exploiting the dual functions of polymer depressants in fine particle flotation[J].International Journal of Mineral Processing,2006,80(2/3/4):244-254.
[]Song S,Lopez Valdivieso A,Ding Y.Effects of nonpolar oil on h drophobic flocculation of hematite and rhodochrosite fines[J].Powder Technology,1999,101(1):73-80.
[10]Song S,Lopez Valdivieso A,Reyes Bahena J L,et al.Hydrophobic flocculation of sphalerite fines in aqueous suspensions induced by alkyl xanthate[J].Colloids and Surfaces A:Physicochemical and Engineering Aspects,2001,181(1-3):159-169.
[11]Song S,Lopez Valdivieso A,Reyes Bahena J L,et al.Floc flotation of galena and sphalerite fines[J].Minerals Engineering,2001,14(1):87-98.
[12]Lu S,Guo J.Kinetics of coagulation of fine mineral particles in a stirred tank[J].Colloids and Surfaces A,1994,84(2/3):195-204.