Abstract
A short plunging jet technique was developed to produce small bubbles in continuous casting tundish, with argon sealing, in order to promote the removal of inclusions smaller than 50 μm. The liquid steel coming out of the ladle shroud is accelerated and vibrated by gravity, leading to gas entrainment. This novel approach is free from bubbles growing along the nozzle surface due to the poor wetting condition, which is applicable to producing small bubbles in liquid steel. Water modeling was carried out to investigate the impact of the free-fall length on gas entrainment by a short plunging jet. The results show that gas can be entrained into the liquid bath with a free fall longer than 15 mm. Part of the entrained gas is separated from the gas sheath by the rough surface of the inflow stream, forming initial bubbles. These initial bubbles are further refined into small ones of 0.4~2.5 mm due to the turbulent flow in the pouring region. The cylindrical shield can effectively isolate the surface fluctuation caused by the short plunging jet; thereby, a stable slag layer in the tundish can be maintained during gas entrainment.
Highlights
Inert gas bubbling [1,2,3,4] has been regarded as an effective method for deep cleaning liquid steel in continuous casting
Bubbles by Gas Entrainment an accurate scale for bubble measurements, the prime lens focuses on a ruler so that only the Figure 3 is a typical photo, displaying the bubble generation by the short plunging jet with a bubbles on the plane of the ruler would be clearly recorded, while the other bubbles were kept free fall length of 20 mm
Gas entrainment by a short plunging jet was developed to produce small bubbles in continuous cast tundishes in order to promote the removal of inclusions
Summary
Inert gas bubbling [1,2,3,4] has been regarded as an effective method for deep cleaning liquid steel in continuous casting. Li et al [19] proposed that the vacuum treatment for liquid steel supersaturated with nitrogen could make small bubbles nucleate based on inclusions Their results indicated that the separating bubbles, smaller than 10 mm, were uniformly distributed in the liquid bath so as to effectively promote the removal of inclusions. The size of the entrapped bubbles depends on the turbulence and terminal velocity of the plunging jet, which can be controlled by the length of the free fall In this approach, bubble growth due to the nonwetting condition is prevented, and the approach is applicable to producing small bubbles in liquid steel
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