Viscosity of Slag Suspensions with a Polar Liquid Matrix
Viscosity of Slag Suspensions with a Polar Liquid Matrix
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DOI：
10.2355/isijinternational.isijint-2020-396
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发表时间：
2020-01-01
影响因子：
1.8
通讯作者：
Nakashima, Kunihiko
中科院分区：
文献类型：
--
作者：
Saito, Noritaka;Hara, Daigo;Nakashima, Kunihiko
在炼钢的操作温度下，大多数炉渣和熔剂通常含有固体，例如未溶解的 CaO 及其反应产物；因此，它们比完全液态时更粘稠。然而，很少有研究考虑此类系统中固体颗粒与液体基质的介电相互作用。在本研究中，测量了室温下由聚乙烯珠组成的分散颗粒在硅油或含水甘油基质中的悬浮液的粘度。然后，提出了基于爱因斯坦-罗斯科方程估计粘度的经验模型。此外，测量了分散在CaO-Al2O3-SiO2-MgO渣基体中的CaO和MgO颗粒悬浮液在1 773 K下的粘度，并研究了所提出的粘度方程的可行性。正如预期的那样，分散在硅油和甘油中的聚乙烯珠的悬浮液的粘度随着珠体积分数的增加而增加。在可比较的测量条件下，甘油悬浮液的粘度高于硅油悬浮液的粘度。基于爱因斯坦-罗斯方程和毛细管数提出的粘度模型再现了硅油悬浮液的粘度，但低估了甘油悬浮液的粘度。分散有 CaO 和 MgO 颗粒的熔渣悬浮液粘度增加的趋势与室温悬浮液相似，表现出宾厄姆非牛顿行为。由甘油水悬浮液结果组成的粘度模型低估了炉渣粘度，这可归因于高极性液体基质中的排斥力。
Under the operating temperatures employed in steelmaking, most slags and fluxes often contain solids, such as undissolved CaO and its reaction products; thus, they are more viscous than their fully liquid states. However, few studies have considered the dielectric interactions of solid particles with the liquid matrix in such systems. In the present study, the viscosity of suspensions of dispersed particles consisting of polyethylene beads in a matrix of silicone oil or aqueous glycerol at room temperature was measured. Then, empirical models for estimating the viscosity based on the Einstein-Roscoe equation were proposed. Furthermore, the viscosity of suspensions of CaO and MgO particles dispersed in a matrix of CaO-Al2O3-SiO2-MgO slag at 1 773 K was measured, and the feasibility of the proposed viscosity equations was investigated. As expected, the viscosities of the suspensions of polyethylene beads dispersed in silicone oil and glycerol increased with an increasing bead volume fraction. Under comparable measurement conditions, the viscosities of the glycerol suspensions were higher than those of the silicone oil suspensions. The proposed viscosity models based on the Einstein-Roscoe equation and the capillary number reproduced the viscosity of the silicone oil suspensions but underestimated that of the glycerol suspensions. The trend of increasing viscosity of the molten slag suspensions with dispersed CaO and MgO particles was similar to that of the room-temperature suspensions, exhibiting Bingham non Newtonian behavior. The viscosity model composed with the results from the glycerol aqueous suspensions underestimated the slag viscosity, which can be attributed to the repulsive forces in the high-polarity liquid matrix.