tailieunhanh - Metallic lead electrorefining from raw material in lead-diethylenetriamine complex solution

The morphology and composition of the electrolyzed lead were analyzed by optical microscope, scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy (EDX). After electrorefining, the impurities were removed and the product was pure lead metal. The lead diethylenetriamine complex solution with three additives as gelatine, dextrine and βnaphthol is promising electrolyte for lead refining via electrolysis process. | Vietnam Journal of Science and Technology 55 (5B) (2017) 27-33 METALLIC LEAD ELECTROREFINING FROM RAW MATERIAL IN LEAD - DIETHYLENETRIAMINE COMPLEX SOLUTION Trung-Dung Dang*, Bui Thi Thanh Huyen, Dang Viet Anh Dung, Vu Anh Dung, Mai Thanh Tung School of Chemical Engineering, Hanoi University of Science and Technology, 1 Dai Co Viet, Hai Ba Trung, Ha Noi, Viet Nam * Email: Received: 1 August 2017; Accepted for publication: 5 October 2017 ABSTRACT Metallic lead was refined from raw material via electrolysis process in lead diethylenetriamine (Pb-DETA) complex solution with presence of various additives. The influence of the additives, Pb-DETA concentration, current density and temperature on lead deposition, dendrite formation and electric current performance were studied. The additives strongly affect to dendrite formation and the deposition of lead metal in the Pb-DETA complex solution. The morphology and composition of the electrolyzed lead were analyzed by optical microscope, scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy (EDX). After electrorefining, the impurities were removed and the product was pure lead metal. The lead diethylenetriamine complex solution with three additives as gelatine, dextrine and βnaphthol is promising electrolyte for lead refining via electrolysis process. Keywords: lead, diethylenetriamin, electrorefining, additives. 1. INTRODUCTION Lead is a familiar metal in our daily life with various applications in electric industry, paint technology and health analysis services. 80 % of this material is used to product lead-acid battery which is still important energy storage system for automobile and electric vehicles [1]. For this application, refined lead metal is required and both of pyrometallurgy and hydrometallurgy processes could be used. However, the best way to refine lead from raw material is electrorefining process because of higher recovery rate of precious metals and .