Refining Method of High Purity Silver from Silver Scrap

摘要

The present invention relates to a method for purifying high-purity silver from silver scrap, and its object is to purify silver scrap having a silver content of 75wt% to 99wt% with high purity silver having a purity of 99.99wt% or more by applying a new purification method. The purpose is to provide a method.;The constitution of the present invention is a method for purifying silver containing iron, copper, and zinc,;Concentrated nitric acid was added to silver scrap containing 65 ~ 95wt% of silver, iron, copper and zinc, heated and decomposed at 80 ~ 90 ℃ to prepare silver nitrate solution. Aqueous solution of NaCl was added to maintain the temperature of the solution at 40 ~ 50 ℃ and stirred to form silver chloride (AgCl), which was then filtered and washed to remove impurities and purified by adding ammonia water to completely dissolve the silver chloride. After preparing a solution of silver complex compounds, an aqueous solution of ascorbic acid dissolved in distilled water is slowly added to it, and then the silver ions are selectively reduced while stirring at 50 to 60 ° C. After precipitation, it is characterized by a method of purifying silver (여과) by filtration, washing and drying.;Silver, silver tablets, high purity, scrap, nitric acid