A
tin stripping waste liquid treating method comprises the following steps: adding
sulfate into a
tin stripping waste liquid, adjusting the pH value to be 1.0-1.5, then adding a
polyacrylamide flocculating agent to recycle
tin, adding
ammonia water with the concentration of 18-25% into
copper-containing
wastewater, conducting
neutralization to recycle
copper, and conducting further treatment on the
wastewater. According to the method,
sulfate is added into the tin stripping waste liquid, so that the effect of tin
hydroxide colloid coagulation is achieved, and the usage amount is
ammonia water can also be reduced; in the
neutralization process, a certain amount of the PAM (
polyacrylamide) flocculating agent is added, so that metallic tin is precipitated in the form of tin
hydroxide; under the acidic condition, most metallic
copper dissociates in a supernatant in the form of copper ions, the tin
hydroxide is obtained through
solid-liquid separation, and the filtrate is subjected to
neutralization, so that copper in the filtrate is precipitated in the form of
copper hydroxide, and the
copper hydroxide is subjected to
solid-liquid separation through a
filter press, that is, in different acidity and
alkalinity systems, the forms of
metal ions are different, so that the
metal ions are separated, tin and copper in the tin stripping waste liquid can be recycled in steps, and the resources in the tin stripping waste liquid can be fully utilized.