Method for preparing silver nitrate with various types of silver-ion-containing waste water as raw materials

[0016] Example 1

[0017] Example 1: Add 200Kg of silver-containing waste water (the silver-containing concentration is 1% after analysis) into a 500L reaction kettle, add 100Kg of chloroform, stir for 10 minutes, let stand for 30 minutes to separate the liquid and discard the chloroform layer, and add trichloromethane again. Chloromethane 100Kg, stirred for 10 minutes, stood for 30 minutes, separated and discarded the chloroform layer to obtain an aqueous layer. Under stirring, 2.5Kg of ascorbic acid was added to the treated water layer, and the temperature of the steam was raised to 50° C. for 60 minutes. The temperature was lowered to 25° C., the material was discharged and filtered to obtain 6.2Kg of silver ascorbate complex in the filter cake. The filter cake silver ascorbate complex 6.2Kg was transferred to a 30L reactor, 65% concentrated nitric acid 6.0Kg was added dropwise under stirring, the dropwise addition was completed, the temperature was raised to 60° C., and the reaction was stirred

[0018] Example 2: Transfer 300Kg of silver-containing waste water (the silver-containing concentration is 1.5% after analysis) into a 500L reactor, add 150Kg of dichloromethane, stir for 10 minutes, let stand for 30 minutes and separate the layers to discard the dichloromethane layer, add again 150Kg of dichloromethane, stirred for 10 minutes, stood for 30 minutes, separated and discarded the dichloromethane layer to obtain an aqueous layer. Under stirring, 6.5Kg of ascorbic acid was added to the treated water layer, and the temperature was raised to 60° C. to react for 45 minutes. The temperature was lowered to 25° C., the material was discharged and filtered to obtain 12Kg of silver ascorbate complex as a filter cake. The filter cake silver ascorbate complex 6.2Kg was transferred into a 50L reactor, 15Kg of 65% concentrated nitric acid was added dropwise under stirring, the dropwise addition was completed, the temperature was raised to 60° C., and the reaction was stirred for 4