The invention discloses a
sulfide heavy
metal chelating agent and a preparation method thereof; the method adopts a reaction between
sodium sulfide water solution and
sulfur to generate
sodium polysulfide and uses aluminum
sulfate,
aluminium chloride and other
aluminum salts as stabilizers so as to strengthen the
flocculation effect and increase the catching effect on heavy
metal ions. The chelating agent is used to treat the industrial
wastewater containing heavy
metal ions, can effectively restrain the generation of
hydrogen sulfide, and reacts with all kinds of heavy metal ions quickly at
room temperature to generate
water insoluble sulfides precipitate, wherein, the particles of the produced sulfides is large, the floccule is dense and the
settling time is reduced so that the concentrations of the heavy metal ions in
wastewater are easy to be reduced below the national
discharge standard, the generated residue can be used for recycling
heavy metals and secondary
pollution is not easy to cause; the method of the invention has simple devices, convenient operation and low cost, thus being applicable to the
wastewater treatment in industries such as circuit board industry, plating industry, metal finishing industry, manufacturing industry,
coal power stations, municipal or
industrial waste incineration industry, battery production and the like.