铜离子浮选的动力学

Kinetics of Ion Floatation for Cupric Ion

发现铜离子的浮选符合零级反应动力学，并求出其速度常数Ｋ＿０。当ｐＨ一定时，Ｋ＿０与流量Ｑ＿ａ成正比，即ｋ＿０＝ｍＱ＿ａ。在ｐＨ＝２～５的范围内，符合ｍ＝１．３７０×１０￣（－５）ｌｎ（ｐＨ／１．２２２）的关系。ｐＨ＝５时ｍ最大，ｐＨ＞５则下降从而得出了Ｋ＿０＝１．３７０×１０￣（－５）Ｑ＿ａｌｎ（ｐＨ／１．２２２）。从单泡吸附模型出发，从理论上提出了浮选效率（η＿ｆ）关系式，可用以评价表面活性剂的浮选效果及工艺条件如流量与ｐＨ等对η＿ｆ的影响。

For the kinetics of ion flotation of cupric ion,a zero order reaction was found by experiment,and the rate constant K_0 was estimated. When the pH of solution maitains constant,the k_0 is proportional to the gas flow rate Q_a,i.e.k_0=mQ_a. In the pH zang of 2 to 5, ploting the slope m against ln(pH), a straight line was oblained,and a maxium value of m was found at pH=5, then fall down at pH>5, the relation in the pH rang of 2 to 5 is represented by k_0=1.370×10￣(-5)ln(pH/1.222),it will be used to estimated the k_0 and remove rate under different pH and Q_a. By the theory of adsorption and using a model of single bubble,a new efficiency of flotation,η_f, was defined,which may be useful in selecting approperiate surfactants and optimum conditions of the technological process,such as,gas flow rate and pH etc.