The invention discloses a production method for separating silver from silver-containing waste liquid. In the method, firstly, the silver-containing waste liquid is complexed with
ammonia water and then filtered, and the
hydroxide of
inert metal ions is precipitated and removed to obtain silver
ammonium solution, and then Use hydrazine
hydrate to reduce the silver
ammonium solution to obtain silver
powder, and finally separate the supernatant, wash the silver
powder with pure water several times, filter and dry to obtain silver
powder with a purity greater than 98%. The invention only needs a small amount of plastic containers and filter cloth, does not need to invest in complicated equipment, only needs two reagents of
ammonia water and hydrazine
hydrate, does not need to introduce other base metals, and does not use halides to precipitate silver, and can complete the removal of silver and other
metal impurities. Separation, the excess
reducing agent added can be removed by washing to obtain higher purity silver powder. The invention has the advantages of low cost, simple operation and high efficiency, and is suitable for recovering and purifying silver in silver-containing waste liquid with a silver concentration greater than 0.1 g / ml, and the separated silver has high purity.