A silver recovery device for silver-containing waste liquid

Abstract

The invention discloses a silver recovery device for silver-containing waste liquid, which comprises a workbench (1), a vertical plate (2) arranged on the workbench (1), an electrolytic cell (3) and a water pump (4), The motor (5) and the lead screw (6) on the vertical plate (2), the lead screw (6) is arranged vertically, the upper end of the lead screw (6) is connected with the output end of the motor (5), the lead screw (6) ) is connected with a nut (7), the left end of the nut (7) is fixedly installed with a vertically arranged cylinder (8), and graphite rods A (11) and graphite are inserted into the inner rings of the two rolling bearings (10). The rod B (12) and the graphite rod B (12) are located below the scraper (9). The side wall of the electrolytic cell (3) is provided with a liquid inlet (13) and a liquid outlet (14). The suction port is connected with the liquid outlet (14). The beneficial effects of the invention are as follows: the silver recovery efficiency is high, the electrolytic silver on the graphite rod can be quickly peeled off, and the labor intensity of workers is reduced.

Description

technical field [0001] The invention relates to the technical field of recovery and reuse of silver in silver-containing waste liquid, in particular to a silver recovery device for silver-containing waste liquid. Background technique [0002] At present, the recovery of metal silver from the waste shadow liquid in the photo industry, the COD analysis waste liquid in the laboratory, and other silver-containing waste liquids, some adopt the method of generating sulfide precipitation and various methods derived on the basis of the method. An improved method, but the above-mentioned method has the disadvantages that are difficult to overcome, that is, the generated sulfide precipitate will release a large amount of SO2 gas when burning, causing serious pollution to the environment, and there are too many inclusions in the precipitate, which hinders silver when burning. Agglomeration and agglomeration often require secondary separation and secondary burning, which not only wastes...

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Problems solved by technology

[0002] At present, the recovery of metal silver from the waste shadow liquid in the photo industry, the COD analysis waste liquid in the laboratory, and other silver-containing waste liquids, some adopt the sulfide precipitation method and various methods derived on the basis of the method. An improved method, but the above-mentioned method has the disadvantages that are difficult to overcome, that is, the generated sulfide precipitate will release a large amount of SO2 gas when burning, causing serious pollution to the environment, and there are too many inclusions in the precipitate, which hinders silver when burning. Agglomeration and agglomeration often require secondary separation and secondary burning, which not only wastes energy, but also easily causes silver loss

Chemical methods are also used, for example, direct reduction with iron flakes, C and Si in the iron flakes will enter the silver powder, making the follow-up treatment difficult. The high-temperature reduction method of sodium sulfide requires small iron furnaces for smelting, which is generally not suitable for processing with a small amount. In the sodium sulfide precipitation method, if hydrochloric acid and iron flakes are used to reduce desulfurization, this is not only one more procedure than the direct reduction of iron flakes, but also due to the solid-liquid phase reaction, the treatment is also cumbersome

[0003] Electrolysis is a commonly used method for recovering silver. The anions produced by electrolysis are transferred to the anode rod, and the electrolytic silver produced by electrolysis is attached to the cathode rod. Silver station, the existing silver stripping method usually uses manual stripping, but the silver is tightly attached to the cathode rod, it is difficult to take it off, which undoubtedly increases the labor intensity of the workers

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