Physicochemical properties of foaming slags

Abstract

Molten slag foams can be considered very dynamic (non-equilibrium) systems, hence their behaviour in industrial processes can be difficult to predict and control. This paper reviews the role of physicochemical properties of molten slags, and the types of stability mechanisms likely to be operating in slag foams. The emphasis of the review relates to slag foams produced under low superficial gas velocities (such as in an electric arc furnace). Here, the 'lifetime' of bubble films in the top layer can be considered the rate limiting step for coalescence and collapse of the foam in a metallurgical reactor.

Effect of Viscosity on Dynamic Evolution of Metallurgy Slag Foaming

“…3(a)), called Partial Foaming I. As demonstrated previously, 24,25) the structure of this spherical foam was so stable that the dynamic evolutions of Partial Foaming I was gentle. When 0.50 mm/s < u s ≤ 16.67 mm/s, all the liquid constituted the foam layers, in which the upper bubbles transformed into the non-sphere including the deformed and polyhedron bubbles at the steady state, called Entire Foaming.…”

Recycling Rubber Tyres and Waste Plastics in EAF Steelmaking

“…The latter factor is dependent on the bubble size and lamellae stability. The physicochemical properties of the slag have a major impact on the formation and stability of a foamy slag 20. Gas entrapment in the slag layer is known to be improved by low surface tension, high viscosity and increased suspension of second phase particle.…”

Effect of slag basicity on Turing pattern corrosion of alumina refractory ceramics in the presence of free radicals

“…The network polymerization degree or NBO of the slag was calculated quantitatively according to the Raman spectroscopic deconvolution and area integration, and the relationship between the slag structure and its high-temperature physicochemical properties, including viscosity and liquidus temperature of the slag, was demonstrated. 23,24 Furthermore, reactive oxygen and other paramagnetic substances (including singlet oxygen, superoxide radicals, hydroxyl radicals, etc.) in biomaterials, medicinal chemistry, photocatalysis, and other organic materials, as well as their chemical reactions, have been measured and analyzed by electron spin resonance spectroscopy (ESR).…”