银的卤化物常作为实验室或工厂生产中的副产物而得到。由于金属银价格较贵,因此,一般都要回收。实验室中,从氯化银回收银常采用在煮沸的氢氧化钾溶液中,用葡萄糖将其还原成银. Halide of silver is often used as a byproduct in laboratory or factory production. As the price of silver metal is more expensive, therefore, generally have to be recycled. In the laboratory, silver is usually recovered from silver chloride in boiling potassium hydroxide solution and reduced to silver with glucose.