Naik H K, Mishra M K, Rao Karanam U M, Deb D
Department of Mining Engineering, National Institute of Technology, Rourkela 769008, India.
J Hazard Mater. 2009 Sep 30;169(1-3):1134-40. doi: 10.1016/j.jhazmat.2009.03.016. Epub 2009 Mar 17.
Transportation of fly ash is a major problem in its efficient disposal. The main problem associated with fly ash transportation is that the particles settle down sooner than desired. The primary objective of this research is that not only the fly ash particles should remain floated till it reaches the end but also settle down after that. In this investigation the role of a drag-reducing cationic surfactant and a counter-ion has been evaluated to achieve the objectives. The experimental results show encouraging trends of surfactant helping fly ash particles to remain water-borne. The material exhibited Newtonian behavior. This paper describes these in term of shear rates, shear stress, temperature, concentration and viscosity. Rheological tests were conducted using Advanced Computerized Rheometer. Zeta potential was measured to test the stability of the colloidal fly ash particles using Malvern Zeta Sizer instrument. Surface tension was also measured to know the drag reduction behavior of the fly ash slurry by using Surface Tensiometer. The test results and flow diagrams were generated using Rheoplus software and are presented in this paper. Surfactant concentration of 0%, 0.1%, 0.2%, 0.3%, 0.4% and 0.5% by weight was mixed with equal amount of counter-ion and the slurry was prepared by adding fly ash with ordinary tap water to achieve the desired solid concentration of 20% (by weight).
粉煤灰的运输是其有效处置中的一个主要问题。与粉煤灰运输相关的主要问题是颗粒沉降比预期更快。本研究的主要目标是不仅粉煤灰颗粒在到达终点之前应保持漂浮状态，而且之后要沉降下来。在这项研究中，为实现这些目标，对一种减阻阳离子表面活性剂和一种抗衡离子的作用进行了评估。实验结果显示出令人鼓舞的趋势，即表面活性剂有助于粉煤灰颗粒保持在水中悬浮。该材料表现出牛顿流体行为。本文从剪切速率、剪切应力、温度、浓度和粘度方面对这些进行了描述。使用先进的计算机化流变仪进行了流变学测试。使用马尔文Zeta粒度分析仪测量zeta电位，以测试胶体粉煤灰颗粒的稳定性。还使用表面张力仪测量表面张力，以了解粉煤灰浆液的减阻行为。测试结果和流程图使用Rheoplus软件生成，并在本文中呈现。将重量百分比为0%、0.1%、0.2%、0.3%、0.4%和0.5%的表面活性剂与等量的抗衡离子混合，并通过向普通自来水中添加粉煤灰来制备浆液，以达到所需的20%（重量）的固体浓度。
