CAJ | 학술논문

提出一种基于微电流作用下的提镉新工艺，采取正交试验考察各工艺参数对海绵镉提取过程的影响，并对 ZnSO4+CdSO4混合溶液中 Zn2+、Cd2+的阴极行为进行电化学研究。结果表明：各因素对提镉率的影响由大到小的顺序依次为温度、pH、极距、电流密度、阴阳极面积比；最佳工艺条件为pH=1、极距3 cm、电流密度400 A/m2、温度90℃、阴阳极面积比1：2，在此条件下电置换1 h提镉率达到79.31%；镉先于锌在阴极析出，当锌开始析出时，溶液中镉离子浓度已降到很低，最低可降至0.528 mg/L。混合溶液阴极沉积的表观活化能为6.379 kJ/mol，在60~90℃时属于扩散步骤控制。
제출일충기우미전류작용하적제력신공예，채취정교시험고찰각공예삼수대해면력제취과정적영향，병대 ZnSO4+CdSO4혼합용액중 Zn2+、Cd2+적음겁행위진행전화학연구。결과표명：각인소대제력솔적영향유대도소적순서의차위온도、pH、겁거、전류밀도、음양겁면적비；최가공예조건위pH=1、겁거3 cm、전류밀도400 A/m2、온도90℃、음양겁면적비1：2，재차조건하전치환1 h제력솔체도79.31%；력선우자재음겁석출，당자개시석출시，용액중력리자농도이강도흔저，최저가강지0.528 mg/L。혼합용액음겁침적적표관활화능위6.379 kJ/mol，재60~90℃시속우확산보취공제。
A new process of cadmium extraction under micro-current was proposed. In order to determine the optimum process parameters, five main effect factors were investigated by an orthogonal experiment. Electrochemical experiments of the cathodic behavior of Zn2+, Cd2+ in mixed solution of CdSO4+ZnSO4 were conducted. The results show that the influence factors on extraction rate decrease in such an order:temperature, pH, polar plate distance, current density, plate area ratio. The optimal conditions are obtained at pH of 1, polar plate distance of 3 cm, current density of 400 A/m2, temperature of 90℃and plate area ratio of 1:2. The maximum extraction rate is 79.31%. Cadmium is prior to precipitate than zinc. The concentration of Cd2+in solution decreases to the minimum of 0.528 mg/L while zinc begins to deposit. The apparent activation energy of deposition is 6.379 kJ/mol. The diffusion-controlled is the dominant process at temperature ranging in 60?90℃.