钢渣处理含铜、锌废水研究
首发时间:2018-11-07
摘要:钢渣因水解呈碱性以及具有较大的比表面积、特殊的微孔结构而被用于去除废水中的Cu2+、Zn2+。考察了钢渣投加量、初始pH值、初始浓度、反应时间对吸附过程的影响,同时研究了钢渣吸附动力学和等温线以及生成物。结果表明:初始浓度为100mg/L,钢渣添加量为0.8g,溶液初始pH为4时,Zn2+的去除率达到99%以上;初始浓度为100mg/L,钢渣添加量为0.3g,溶液初始pH为4时,Zn2+的去除率达到99%以上。钢渣对Cu2+、Zn2+的吸附符合准二级动力学模型和Langmuir模型,表明钢渣对Cu2+、Zn2+的吸附是单分子层均匀吸附且主要是化学吸附。对吸附后的钢渣进行检测结果显示钢渣对Zn2+和Cu2+的化学吸附主要包括化学沉淀、离子交换。
关键词: :钢渣 Cu2+ Zn2+ 吸附 动力学 化学沉淀
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Study on treatment of copper and zinc containing wastewater by steel slag
Abstract:Steel slag is used to remove Cu2+ and Zn2+ from wastewater due to its alkaline hydrolysis and large specific surface area and special microporous structure. The effects of steel slag dosage, initial pH value, initial concentration and reaction time on the adsorption process were investigated. The adsorption kinetics and isotherms and products of steel slag were also studied. The results show that the initial concentration is 100mg/L, the optimum condition for removing Zn2+ from steel slag is: steel slag 0.8g, initial pH=4; the best condition for removing Cu2+ is: steel slag 0.3g, initial pH=4, the removal rate of Cu 2+ and Zn2+ from steel slag is more than 99%. The adsorption of Cu2+ and Zn2+ by steel slag accords with Langmuir isotherm adsorption model and quasi-secondary kinetic model. It indicates that the adsorption of two metal ions by steel slag is uniform adsorption of monolayer and the main adsorption mechanism is chemical adsorption. The test results of the adsorbed steel slag showed that the chemical adsorption of Cu2+ and Zn2+ by steel slag mainly includes chemical precipitation and ion exchange.
Keywords: Steel slag Cu2+ Zn2+ adsorption kinetics chemical precipitation
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