Absorption Rates of Blown Bubbles into Molten Metal

Mori, Kazumi; Sano, Masamichi; Hishida, Mamoru; Suzuki, Kanae

doi:10.2355/tetsutohagane1955.55.13_1142

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“…Typical results obtained with the 0'085cm dia. orifice are plotted in Fig.7 in accordance with equation (6). For these conditions the equilibrium oxygen content is very nearly zero and 00 is 0·025wt-%.…”

Section: Copper-oxygen Meltsmentioning

confidence: 93%

“…Mori et al 6 have measured the rate of absorption of oxygen into liquid silver from single oxygen bubbles formed at submerged orifices at very low flowrates « 3·25 cm 3 s-1 at STP). They obtained results similar to those in the present study.…”

Section: Bubble-size Determinationmentioning

confidence: 99%

“…A discussion of the behaviour of gas jets in liquids is given in detail by Oryal and Brimacombe 5 and Fruehan and Martonik. 2 The two most recent and relevant studies concerning the reaction of gas bubbles formed at submerged orifices and liquid metals are the work of Mori et al 6 on the rate of absorption of oxygen in silver and of Andreini et al 7 on the rate of deoxidation of copper with CO. In both these studies the flowrates were relatively low and confined to the single-bubble region.…”

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Mass transfer between liquid metals and injected gases

Fruehan¹

1980

Metals Technology

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To cite this article: R. J. Fruehan (1980) Mass transfer between liquid metals and injected gases, Metals Technology, 7:1, 95-101, The rate of liquid-phase mass transfer between submerged.boltom-blown and submerged top-blown gas jets and liquid metals wa~investigated. The rates of oxygen absorption in liquid silver, deoxidation of silver by argon, and deoxidation of liquid copper by CO gas jets were measured. The orifice diameters ranged from 0·46 to 2·2mmandtheflowratesfrom 1·75 to 45cm 3 s-1 at STPor 7·5 to 192cm 3 s-1 at the temperature of the melt. The oxygen contents were measured with a galvanic cell with a solid-oxide electrolyte. As support work, afew measurements of the frequency of bubbles formed at submerged orifices in liquid silver and copper were also made. The rates were controlled by liquid-phase mass transfer for the absorption of oxygen into silver at oxygen contents greater than 0·25 wt-% andfor the deoxidation of copper at oxygen contents less than 0·025 %. At oxygen contents greater than 0·025 % in copper and less than O· 25 % in silver the rates were fast and essentially controlled by the rate of gas injection. The rate of mass transfer increased with gas flowrate and depth of jet submersion. The ma$s-transfer parameters were nearly the same for both metallic systems. At low flows in the single':'bubble region the measured mass-transfer coefficients were in good agreement with those calculated from theory. In all cases of boltom-blown argon jets usedfor the deoxidation of silver, gas-metal equilibrium was obtained and the maximum rate of removal was achieved. A discussion of the results relative to steelmaking reactions and processes is given. MT/643The emergence of Q-BOP and AOD steelmaking processes has led to considerable interest in the reactions between gas bubbles or jets and liquid metals. Several reactions in these processes are controlled by liquid-phase mass transfer between the gas jet and the liquid metal, for example, decarburization at low carbon levels and carbon deoxidation with argon. 1 In these processes there is more effective liquid-phase mass transfer than in top-blown processes. This is why, for example, there is more efficient decarburization in the Q~BOP than in the BOP, and hence less iron oxidation. In recent work, both the shape of gas jets in aqueous solutions and the rate of liquid-phase mass transfer have been determined. 2 In the present work, the rate of mass transfer between gas jets and liquid metals was investigated to determine the effect of the operating variables on this rate. The deoxidation of copper with CO, the absorption of oxygen into silver, and the removal of oxygen from silver by argon were investigated. These reactions are very similar to several steelmaking reactions and the rates of these reactions can be measured accurately. Also, as support work, the bubble frequency of argon bubbles formed at submerged orifices in liquid silver and copper was measured.Despite recent studies, the behaviour of gas jets in liquid metals is not completely und...

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Section: Copper-oxygen Meltsmentioning

confidence: 93%

Section: Bubble-size Determinationmentioning

confidence: 99%

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