STUDY ON FINE BUBBLE DISPERSION BY GAS INJECTION IN METAL REFINING PROCESSES

金属精炼过程中注气微细气泡分散的研究

• 批准号: 07455430
• 负责人: SANO Masamichi
• 金额: $ 0.58万
• 依托单位: NAGOYA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07455430/
• 关键词: INJECTION METALLURGY; ROTARY LANCE; SLOT NOZZLE; FINE BUBBLE; MIXING TIME; GAS ABSORPTION; PLUME; WETTABILITY; インジェクション冶金; カズ吸収; 溶融金属; スリットノズル; 回転ノズル; ガス吹込み; 気泡; 微細化; 気泡上昇速度

1. In the case of gas injection from the L-shaped rotary lance, (1) the mixing time decreases with increasing the rotation speed. At large gas flow rates the mixing time decreases with increasing the bath depth. (2) Gas injected through the rotary lance allows the bubbles to be distributed over the liquid bath, where they rise without acting on each other. (3) The multi-hole lance produces smaller bubbles as compared with the single-hole lance. In the range of the large rotation speed, bubble coalescence rate increases with the rotation speed. (4) The gas absorption rate increases as compared with the gas injection through the stationary lance. This occurs due to increases in the bubble-liquid interfacial area and the bubble residence time. (5) When gas is injected through the multi-hole lance, the gas absorption rate is larger by three times as compared with the single-hole lance. The use of the multi-hole lance leads to the decrease of the absorption rate in the range of the large rotation speed.2. When gas is injected through slot nozzles, (1) small bubbles are formed along the slot at discrete locations and dispersed over the liquid bath. (2) The number of bubble sources for non-wetted slot nozzle is less than observed for gas injection from wetted slot nozzle. (3) The bubble size measured experimentally is in good agreement with that calculated from Davidson and Schuler model. (4) A peaked slot nozzle produces smaller bubbles as compared with a flat slot nozzle. (5) The line of bubble formation sites along the slot generates a wide bubble plume, which may offer high efficiency for metal refining process. The present work proves that gas injection through the L-shaped rotary lances and the slot nozzles can improve the refining characteristics of the metallurgical processes.

1.在从L形旋转喷枪喷射气体的情况下，（1）混合时间随着旋转速度的增加而减少。在大的气体流量下，混合时间随着浴深度的增加而减少。(2)通过旋转喷枪注入的气体允许气泡分布在液池上，在液池中气泡上升而不相互作用。(3)与单孔喷枪相比，多孔喷枪产生更小的气泡。在大转速范围内，气泡聚并速率随转速的增大而增大。(4)与通过固定喷枪喷射气体相比，气体吸收速率增加。这是由于气泡-液体界面面积和气泡停留时间的增加。(5)多孔喷枪喷吹气体时，气体吸收率比单孔喷枪大3倍。多孔喷枪的使用导致在大转速范围内吸收率降低.当气体通过狭缝喷嘴注入时，（1）小气泡沿狭缝在离散位置处沿着形成并分散在液体浴上。(2)非湿缝喷嘴的气泡源数量小于从湿缝喷嘴喷射气体时观察到的数量。(3)实验测得的气泡尺寸与Davidson和舒勒模型计算的气泡尺寸吻合较好。(4)与平缝喷嘴相比，尖缝喷嘴产生更小的气泡。(5)沿着槽沿着的气泡形成位置的线产生宽的气泡羽流，这可以为金属精炼过程提供高效率。本文的工作证明，通过L形旋转喷枪和狭缝喷嘴的气体喷射可以改善冶金过程的精炼特性。

项目成果

M.C.Diaz, S.V.Komarov and M.Sano: "Bubble Behavior and Absorption Rate by Gas Injection into Liquid through Rotary Lances" ISIJ International. 37-1. 1-8 (1997)

M.C.Diaz、S.V.Komarov 和 M.Sano：“通过旋转喷枪将气体注入液体的气泡行为和吸收率”ISIJ International。

S.V.Komarov, M.C.Diaz and M.Sano: "Gas Injection through Immersed Ratory Lances" The Howard Worner International Symp. On Injection in Pyrometallurgy, Melbourne, Austraria. 267-274 (1996)

S.V.Komarov、M.C.Diaz 和 M.Sano：“通过浸入式 Ratory 喷枪进行气体注入”霍华德·沃纳国际 Symp。

M. C. Diaz: "Mixing Characteristics under Gas Injection through Rotary Lance Submerged in Liquid Bath" ISIJ International. 35・5. 464-471 (1995)

M. C. Diaz：“通过浸没在液浴中的旋转喷枪进行气体注入的混合特性”ISIJ International 35・5（1995）。

M. C. Diaz: "Bubble Behaviour and Absorption Rate by Gas Injection into Liquid through Rotary Lances" ISIJ International. 37・1. 1-8 (1997)

M. C. Diaz：“通过旋转喷枪将气体注入液体的气泡行为和吸收率”ISIJ International，37·1-8（1997 年）。

K.Okumura, R.Harris and M.Sano: "Bubble Formation from Non-wetted Slot Nozzles" Challenges in Process Intensification. 23-34 (1996)

K.Okumura、R.Harris 和 M.Sano：“非润湿槽式喷嘴形成气泡”过程强化中的挑战。