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本文研究了富氧吹炼、温度及空气流量等因素对熔体 Cu_2S 氧化脱硫速度的影响。试验结果表明,在 Cu—Cu_2S 体系中,反应速度为一常数,即在体系分层区,脱硫量与吹风时间成直线关系。直线斜率即反应速度随氧浓度、温度和空气流量的增高而增大。白冰铜(Cu_2S)在吹炼过程中的反应级数,在分层区:当Po_2<0.60atm 时,与氧分压为一阶反应,与硫浓度为零阶反应;Po_2>0.60atm 时,与 Po_2及硫浓度均为动力学上的零阶反应。在分层后的低硫单相区,用空气吹炼,与硫浓度及 Po_2均为一阶反应。试验还验证了:温度在1200℃时,用空气吹炼,脱硫速度由分层区转入低硫单相区时,有显著的转折点,与此转折点相应的含硫量约1.2%左右,和由热力学计算所得1.28%的含硫量相差不大。转折点以后的脱硫速度的降低,与含硫浓度的减少成直线关系,与硫活度的降低成比例。根据转折点前后的动力学方程式,讨论了铜转炉吹炼第二周期终点的控制问题。由于吹风量大,Cu—Cu_2S 系分层区吹炼过程的限制步骤,为氧分子在界面上的吸附作用,其动力学方程式与 Langmuir 等温吸附相似。
In this paper, the effects of oxygen-rich blowing, temperature and air flow on the oxidative desulfurization rate of molten Cu_2S were studied. The experimental results show that in the Cu-Cu 2 S system, the reaction rate is constant, that is, in the stratified zone of the system, the amount of desulfurization is in a linear relationship with the blowing time. The slope of the line, ie the reaction rate, increases with increasing oxygen concentration, temperature and air flow. The reaction order of Cu2S in blowing process is as follows: in the stratified zone, when the Po_2 <0.60atm, it is the first order reaction with the partial pressure of oxygen and the zero order reaction with the sulfur concentration; when Po_2> 0.60atm , And Po_2 and sulfur concentration are kinetic zero order reaction. In stratified low-sulfur single-phase zone, blowing with air, and the sulfur concentration and Po_2 are first-order reaction. The experiment also verifies that when the temperature is 1200 ℃, there is a significant turning point when the velocity of desulfurization is changed from stratified zone into low-sulfur single-phase zone by air blowing, and the sulfur content corresponding to this turning point is about 1.2% The calculated sulfur content of 1.28% by thermodynamics is not much difference. The reduction of the desulfurization rate after the turning point is in a linear relationship with the reduction of the sulfur concentration, in proportion to the reduction of the sulfur activity. According to the kinetic equations before and after the turning point, the control of the end of the second cycle of copper converter blowing was discussed. Due to the large amount of blowing air, the limiting step in the blowing process of Cu-Cu 2 S stratified zone is the adsorption of oxygen molecules on the interface. The kinetic equation is similar to that of Langmuir isothermal adsorption.