【摘要】 铜冶炼过程中会产生大量难处理的含有高浓度Cu²⁺和Cl^-的污酸废水,将这类废水作为稀硫酸进行回用之前需要对其中的污染物进行高效去除。研究提出在硫脲和抗坏血酸作用下,通过沉淀反应对污酸废水中的Cu²⁺和Cl^-进行同步去除。结果表明,当投加的硫脲和抗坏血酸与废水中Cu²⁺的摩尔比为1∶1∶1时,室温下反应20min后,Cu²⁺和Cl^-的去除效率可分别达到88.5%和82.2%,进一步研究显示,该方法在最佳反应温度50℃下,对硫酸浓度在50～160g/L范围内的铜冶炼污酸废水中的Cu²⁺和Cl^-均具有良好去除效果。经初步鉴定表征,认为反应中生成的沉淀物为[Cu_xTU_y]Cl_z·nH₂O和[Cu_xTU_y]SO_4z/2·nH₂O。更多还原

【Abstract】 Large quantities of refractory acidic wastewater containing high concentrations of Cu²⁺ and Cl^- is produced during the copper smelting process.It is necessary to efficiently remove the contaminants before this type of wastewater being recycled.This study proposes the simultaneous removal of Cu²⁺ and Cl^- from wastewater by precipitation reactions under the action of thiourea and ascorbic acid.The results show that 88.5% of Cu²⁺ and 83.6% of Cl^- can be removed after 20 min of reaction at room temperature with a TU∶AC∶Cu²⁺ mole ratio of1∶1∶1.At the optimum reaction temperature of 50℃,this method can efficiently remove Cu²⁺ and Cl^- from copper smelting acidic wastewater with H₂SO₄ concentration of 50—160 g/L.With preliminary identification and characterization,the precipitates produced in the reaction are identified to be composed of[Cu_xTU_y]Cl_z·nH₂O and[Cu_xTU_y]SO_4z/2·nH₂O.更多还原