System and method for treating acidic wastewater produced in acid making with smelting gas

Abstract

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.

Description

Technical field [0001] The invention is a chemical industry, involving wastewater treatment in non -ferrous metal smelting, and specifically involves a treatment system and method for the acid wastewater in the acidic wastewater in the smelting of acidic acid. Background technique [0002] In the process of smelting flue gas acid and wetting method, a large amount of acidic wastewater containing nickel, copper, lead and other harmful elements such as nickel, copper, lead, etc. pollute the environment.The process function is single, the processing process is troublesome, and each bad section cannot be linked to comprehensive circulation. Invention content [0003] The present invention is aimed at the acidic wastewater in the non -ferrous metal smelting flue gas acid. The purpose is to provide a medium and acid wastewater in the use of magnesium oxide desulfurization absorption fluid, and in -depth treatment of the hydroxy base sinking method of the neutralized wastewater after...

AI Technical Summary

Problems solved by technology

[0002] During the wet scrubbing process of smelting flue gas acid production, a large amount of acid wastewater containing heavy metals such as nickel, copper, lead, and harmful elements such as arsenic and fluorine is produced, which pollutes the e...

Images