1.回收银的意义及状况银是贵金属之一,不仅外观美丽,而且具有高的导电性,抗氧化性,良好的加工性,导热率在金属中最高,卤化银具有良好的感光度.因此,银广泛地用作照相、电接点、首饰、焊料、催化剂、镀层、货币、电池、镜子、假牙、轴承等材料,其用量逐年增加,成为现代科学技术,文化生活中不可缺少的重要金属.然而,银的资源有限, 1. The significance and status of silver recovery Silver is one of the precious metals, not only looks beautiful, but also has high electrical conductivity, oxidation resistance, good processability, the highest thermal conductivity in the metal, silver halide has a good sensitivity. Silver is widely used as materials for photography, electrical contacts, jewelry, solders, catalysts, coatings, currency, batteries, mirrors, dentures and bearings. The amount of silver is increasing year by year and has become an indispensable and important metal in modern science and technology and cultural life. However, silver has limited resources,