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。对于从L形旋转长矛注入气体的情况，（1）混合时间随旋转速度的增加而减小。在较大的气体流速下，混合时间随着浴缸深度的增加而减少。 （2）通过旋转长矛注入的气体可以使气泡分布在液体浴上，在那里它们会上升而不相互作用。 （3）与单孔长矛相比，多孔长矛会产生较小的气泡。在较大的旋转速度范围内，气泡合并速率随旋转速度而增加。 （4）与通过固定长矛注入的气体注入相比，气体吸收率增加。这是由于气泡液界面区域和气泡停留时间的增加而发生的。 （5）当气体通过多孔长矛注入气体时，与单孔长矛相比，气体吸收率更大三倍。多孔长矛的使用导致较大旋转速度范围内的吸收率降低。2。当通过插槽喷嘴注入气体时，（1）在离散位置沿插槽形成小气泡并在液体浴上分散。 （2）非润湿槽喷嘴的气泡源数量小于湿槽喷嘴注入气体的气泡。 （3）实验测量的气泡尺寸与戴维森和舒勒模型计算得出的气泡尺寸非常吻合。 （4）与平面槽喷嘴相比，峰值插槽喷嘴会产生较小的气泡。 （5）沿插槽的气泡形成位点的线产生宽的气泡羽流，这可能为金属精炼过程提供高效率。目前的工作证明，通过L形旋转长矛注入气体，插槽喷嘴可以改善冶金过程的精炼特性。

项目成果

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, 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。

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。

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）。