CAJ | 학술논문

为了降低电积法生产铜粉的能耗,减小阳极腐蚀率,提高阴极铜粉品质,采用反重力渗流技术制备不同合金成分、不同孔径的多孔 Pb 合金阳极,并与平板阳极在阳极电位、阳极腐蚀率、阳极氧化膜的形貌与组成、阴极铜粉的纯度和形貌等方面进行对比.结果表明:多孔阳极可以降低阳极真实电流密度,从而降低析氧过电位,如孔径1.0~1.25 mm的Pb-Ag多孔阳极的析氧过电位比同样合金成分平板阳极的降低了131 mV,可以显著降低铜粉电积过程的能耗.另外,多孔阳极表面氧化膜由疏松的粉末状变为致密、平整的片状,提高了阳极的耐腐蚀性能,可以降低阴极铜粉中的Pb含量,有利于提升产品品质.
위료강저전적법생산동분적능모,감소양겁부식솔,제고음겁동분품질,채용반중력삼류기술제비불동합금성분、불동공경적다공 Pb 합금양겁,병여평판양겁재양겁전위、양겁부식솔、양겁양화막적형모여조성、음겁동분적순도화형모등방면진행대비.결과표명:다공양겁가이강저양겁진실전류밀도,종이강저석양과전위,여공경1.0~1.25 mm적Pb-Ag다공양겁적석양과전위비동양합금성분평판양겁적강저료131 mV,가이현저강저동분전적과정적능모.령외,다공양겁표면양화막유소송적분말상변위치밀、평정적편상,제고료양겁적내부식성능,가이강저음겁동분중적Pb함량,유리우제승산품품질.
In order to reduce the energy consumption of copper powder electrowinning, enhance the corrosion resistance of anode and improve the product quality, the Pb-based porous anodes with different pore sizes and various Ag and Ca contents were prepared by counter-gravity infiltration, and compared with plate anodes in following aspects: anodic potential, anodic corrosion rate, morphology and composition of the anodic oxidation film, purity and morphology of cathodic product. The results show that the porous anode can reduce the real anodic current density and decrease anodic oxygen evolution overpotential. For example, the oxygen evolution overpotential of Pb-Ag porous anode (pore diameter of 1.0?1.25 mm) is 131 mV lower than that of Pb-Ag plate anode, which can significantly decrease the energy consumption. Besides, the anodic oxidation film of porous anode changes from loose, powdery form into denser, flatter flaky form, which can enhance the anodic corrosion resistance, reduce the Pb content of copper powder and then improve the product quality.