采用共沉淀－离子交换法除杂工艺制备高纯硝酸银，工艺条件温和，易于操作，收率达到９９．５％，除杂效果好。试样经质量检测，产品质量达到了国外进口产品的质量水平。本工艺所有母液及工艺水能循环使用，树脂再生时有少量废水产生，可有效治理。据初步估算，按年产 ２０ｔ硝酸银计，年利税可达５４００万元。 The coprecipitation-ion exchange method is adopted to prepare high-purity silver nitrate, and the process conditions are mild and the operation is easy. The yield is up to 99.5% and the impurity removal effect is good. After the sample quality testing, product quality has reached the quality level of imported products. All the mother liquor and process water in this process can be recycled, and a small amount of wastewater generated when the resin is regenerated can be effectively treated. According to preliminary estimates, according to the annual output of 20t silver nitrate, the annual profits and taxes up to 54 million yuan.