The liquid reaction in a submerged top‐blow agitation process was studied using planar laser‐induced fluorescence (PLIF) technology based on the principle of fluorescence quenching. The liquid reaction effects were analyzed using the reaction degree θ (t) and reaction time t₉₅ under different conditions. The results show that the liquid reaction time decreases obviously for an increase in the air flow rate and submerged depth of the spray gun. The injection position of Fe³⁺ has a great influence on the reaction process; the reaction process is also different under other blowing conditions when Fe³⁺ is injected at the bottom. The reaction time of Fe³⁺ at the bottom injection position is higher than that at the top injection position; increasing the air flow rate and submerged depth of the spray gun can effectively reduce the difference in the reaction times at the two injection points. The effect of the injection position on the reaction time is eliminated when the spray gun submerged depth is close to the reactor bottom. The initial volume of Fe³⁺ has no obvious effect on the reaction time; however, an increase in the initial molarity of Fe³⁺ can decrease the reaction time.

中文翻译：

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淹没式顶吹搅拌过程中液体反应的可视化▴

基于荧光猝灭原理，使用平面激光诱导荧光（PLIF）技术研究了浸入式顶吹式搅拌过程中的液体反应。使用反应度θ（t）和反应时间t ₉₅在不同条件下分析液体反应效果。结果表明，随着空气流量和喷枪浸没深度的增加，液体反应时间明显减少。Fe ³⁺的注入位置对反应过程影响很大。当底部注入Fe ³⁺时，在其他吹炼条件下反应过程也不同。Fe ³⁺的反应时间底部进样位置高于顶部进样位置；增加空气流量和喷枪的浸没深度可以有效减少两个注入点的反应时间差。当喷枪浸没深度接近反应器底部时，可以消除注入位置对反应时间的影响。Fe ³⁺的初始体积对反应时间无明显影响。但是，增加Fe ³⁺的初始摩尔浓度可以缩短反应时间。