Removal of Chloride from Sulfuric Acid Wastewater by Na2SO3 and Cu(II) Based on the Process of Reduction and Precipitation

Abstract

AbstractNonferrous metal smelting enterprises generate large volumes of sulfuric acid (H2SO4) wastewater annually, which contains chloride (Cl−), fluoride (F−), arsenic, and heavy metal impurities. Currently, recycling has become a research hotspot in the ...The Graphical Abstract consists of three sections. The first section illustrates the reduction mechanism of cuprous ion from copper ion under the action of sulfite ion. The second section shows the process of valence state and complexation state ...