The invention provides a chemical mineral dressing
pretreatment method for waste
printed circuit board multi-
metal powder. According to the chemical mineral dressing
pretreatment method for the waste
printed circuit board multi-
metal powder, oxidizing leaching of the waste
printed circuit board multi-
metal powder is conducted in an alkaline
system containing a catalyst through feeding of
oxygen,
tin is dissolved into a leaching solution in a
sodium stannate form,
copper is separated from a residual plastic matrix at the same time, and the
tin is recycled from the leaching solution through an electro-deposition method; and a
copper-enriched object and waste plastic are generated from leaching residues in a shaking table separation manner, and the waste plastic is oxidized and dissolved in a
sulfuric acid solution in a potential-controlled manner, so that
copper mixed with the waste plastic is completely dissolved. The essence of the chemical mineral dressing
pretreatment method for the waste printed circuit board multi-
metal powder is that the waste printed circuit board multi-
metal powder is treated in the chemical mineral dressing manner combining alkaline pressurized oxidation leaching and shaking table separation, effective removal of the
tin and the plastic in the multi-
metal powder is achieved at the same time, and high-quality raw materials are provided for following-up recycling of copper. The content of the plastic in the copper-enriched object is smaller than 0.1%, and the environmental
pollution caused in the following-up copper recycling process is completely eradicated through the source treatment measure. The content of the copper in the waste plastic is smaller than 0.1%, and dispersed loss of heavy metal and secondary
pollution are avoided.