There are many ways to recover silver from waste emulsions used in the manufacture of photosensitive materials plants. More important methods are: waste latex containing silver (2.75 ~ 8.0) × 10 -4 , first add about 1.5% of the weight of waste latex NaOH, heated to 85 ° C to destroy gelatin. Further, Na 2 S 2 O 3 equivalent to 0.15% by weight of the waste latex was added, and silver halide was decomposed at 85 °C. And finally about 0.09% by weight of the latex equivalent to the waste of NaBH 4, i.e., reduced to silver metal. The precipitated silver is easily separated, and the solution containing silver is less than 2 × 10 -4 % after sinking silver. Japan-patent recommended alkali metal salt melting method is to add 0.3 to 5 mol (molecular) of solid alkali metal hydroxide, carbonate or bicarbonate per mole of (molecular) silver to the waste latex (at least A), after the heat and melt decomposition, the metallic silver is separated from the inorganic compound. This method recovers 99% of silver from waste such as waste emulsion, film or printing paper. The purity of silver can reach 99.3%. Silicone Baby Toothbrush,Silicone Finger Brush Baby,Baby Cartoon Soft Toothbrush,Finger Toothbrush For Infants Hubei Daxin Electronic Technology Co., LTD , https://www.aiwellgroup.com