零价铁处理冷轧含铬废水的研究  

Chromium Removal From Cold Rolling Wastewater by Zero-valent Iron

作　　者：李陈君[1] 雷国元[1] 印露[1] 王德民[1] 

机构地区：[1]武汉科技大学矿产资源高效利用与造块湖北省重点实验室,武汉430081

出　　处：《工业安全与环保》2012年第7期1-4,共4页Industrial Safety and Environmental Protection

基　　金：国家自然科学基金重点项目(50578051)

摘　　要：研究了Fe0处理冷轧含铬废水的适宜条件,并对Fe0去除废水中Cr(Ⅵ)的反应机制及动力学规律进行了探讨。结果表明,在30℃,Fe0和酸液的投加量分别为2.2 g/L和1.2%(体积分数),振荡转速为200r/min,反应时间20 min,沉淀pH值为8～9,沉淀1 h时,总Cr和Cr(Ⅵ)去除率高达99.99%和100%。Cr(Ⅵ)去除的反应机制主要是Fe0对Cr(Ⅵ)的还原作用及金属氢氧化物在Fe0表面的沉积和共沉积作用,其中Cr(Ⅵ)的还原反应符合拟一级反应动力学规律,表观速率常数随反应温度的升高而增大。This paper studies the optimum conditions of treatment for cold rolling wastewater containing chromium by zero - valent iron, and discusses the reaction mechanism and kinetics roles for Cr（ Ⅵ） removal in the wastewater. When the reac- tion temperature, dosage of Fe° and acid solution, oscillator speed, reaction time, pH value range of precipitation and pre- cipitation time shows 30 ℃, 2.2 g/L, 1.2%, 200 r/min, 20 rain, 8 ～ 9 and lh respectively, the removal e/ilciencies of total Cr and Cr（ Ⅵ ） could achieve 99.99% and 100%. The Cr（ Ⅵ ）removal is mainly attributed to reduction effect of Fe°, moreover the precipitation and co- precipitation effect of metal hydroxides on the Fe° surface. The reduction process of Cr （Ⅵ ） follows to pseudo first order reaction law and the apparent rate constant increases with the increase of reaction temperature.

关 键 词：零价铁 含铬废水 机制 动力学 

分 类 号：X758[环境科学与工程—环境工程]