Wettability in water/iron ore powder systems: To the universality of the Cassie model
Wettability in water/iron ore powder systems: To the universality of the Cassie model
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DOI：
10.1016/j.minpro.2017.02.016
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发表时间：
2017-05-10
影响因子：
--
通讯作者：
Douce, Jean-Francois
中科院分区：
文献类型：
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作者：
Rivera, Rodolfo Marin;Koltsov, Alexey;Douce, Jean-Francois
在铁矿石造粒过程中，由于第二烧结步骤中蒸发的相关能量成本，水体积的最小化具有至关重要的经济意义。水添加的优化需要了解铁矿石混合物的毛细作用特性，以确保铁矿石颗粒具有良好的机械强度，同时造粒滚筒中的水仅需最少。因此，在目前的工作中，润湿性和毛细性能的7种铁矿石，7种添加剂和7种混合物的这些成分进行了研究。结果表明，粒径小于0.1mm的颗粒对混合物的接触角和渗水率有较大影响。特别地，赤铁矿矿石1的含量对接触角具有显著影响。白云石和白云石添加剂的使用对水表面张力的大小影响不大，但改变了铁矿石的润湿性。Cassie模型对> 2相的铁矿石混合物的适应给出了粒径小于0.1 mm的混合物的接触角的极好估计。也获得了粒径大于0.1 mm的混合物的良好估计。(C)2017爱思唯尔B.V.保留所有权利。
During iron ores granulation process minimization of the volume of water is of vital economic importance due to the associated energy cost of evaporation in the second sintering step. The optimisation of water addition demands understanding of capillarity properties of iron ore mixtures to ensure at the same time good mechanical strength of iron ore granules and just needed minimum of water in the granulation drum. Thus, in the current work wettability and capillarity properties of 7 iron ores, 7 additives and 7 mixtures of those components were studied. It was found that particles with size below 0.1 mm have a big influence on the contact angle and percentage of infiltrated water of mixtures. Particularly, the content of hematite Ore 1 had a significant effect on the contact angle. The use of calcine and dolomite additives affects slightly the magnitude of the water surface tension, but modifies the wettability of iron ores. The adaptation of the Cassie model for mixtures of iron ores of > 2-phases gave an excellent estimation of the contact angle for mixtures with size particles below 0.1 mm. A good estimation for mixtures with particles larger than 0.1 mm was also obtained. (C) 2017 Elsevier B.V. All rights reserved.