The invention discloses a
system and a method for treating acidic
wastewater produced in acid making with
smelting gas. The
system and method disclosed by the invention are implemented through the steps that after a
sodium sulfide solution and acidic
wastewater are fed into a first-order reactor to react for removing part of
heavy metals and
arsenic in
acid water, the obtained object enters a first-order thickener; bottom mud in the thickener, after being subjected to, is recycled, liquid supernatant and filtrate produced by a
filter press enter a second-order reactor, and then the liquid supernatant, the filtrate,
magnesium oxide absorption liquid discharged after being desulfurized in an environmental-friendly
smelting gas gathering
system and added into the second-order reactor, a prepared
magnesium oxide solution, and a
sulfuric acid in the
acid water are subjected to a sufficient
neutralization reaction by using
magnesium oxide and
magnesium sulfite contained in environmental-friendly gathered
smelting gas desulfurized absorption liquid and a magnesium oxide solution; and an aluminum salt is added so as to reduce the heavy
metal content of reaction liquid to a control range; the obtained object enters a second-order thickener, bottom mud in the thickener, after being subjected to filter pressing, is conveyed to a
hazardous waste disposal site to carry out landfill disposal, and liquid supernatant and filtrate produced by the
filter press enter a second-order reactor, after being subjected to deep treatment by using an iron carbonyl co-
precipitation method and then reaching the standards, are recycled or discharged. According to the method, an effect of treatment of wastes with processes of wastes against one another is achieved, the pertinence is strong, the operation cost of
environmental protection facilities is lowered, and the
discharge amount of the system is reduced.