铁泥海绵铁的制备及其在DSD酸氧化废水处理中的应用  

Sponge iron making with iron sludge and its utilization in DSD acid oxidation wastewater treatment

作　　者：孙春宝[1] 周北海[1] 段旭琴[1] 邢奕[1] 窦源东[2] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]山东省科学院能源所山东天力干燥设备有限公司,济南250014

出　　处：《北京科技大学学报》2007年第3期256-260,共5页Journal of University of Science and Technology Beijing

基　　金：北京市教育委员会共建项目建设计划资助项目(No.XK100080432)

摘　　要：利用DSD酸生产过程产生的铁泥，研制出既能用作常规冶金原料，又能用于处理DSD酸氧化废水的水处理用海绵铁．研究表明：在配碳量27％、反应温度1160℃、反应时间16min的情况下，以铁泥为原料制备的常规海绵铁的金属化率可达90％以上；用于处理DSD酸氧化废水的海绵铁适宜配碳量为29％，用制备出的海绵铁处理DSD酸氧化废水，在pH值3～5、反应时间40min时，出水的CODCr去除率可达68％、色度的去除率达90％、可生化性指标BOD／COD提高到0．425．海绵铁中所含C，Fe3C和其他一些杂质元素，这些元素能与铁在水中形成无数微小原电池产生大量[H]，[OH]和[Fe^2＋]，从而氧化还原废水中的有机物，达到污染物降解和提高废水可生化性的目的．海绵铁的微孔结构非常发达，使其具有比表面积大、活性高的特点．是一种替代常规铁屑的理想材料．The sponge iron making with iron sludge produced during DSD acid-making can be used for not only general metallurgy but also iron-carbon bed to treat DSD acid oxidation wastewater. It is pointed out that under the condition of the temperature of 1 120℃, the reaction time of 16 min and the carbon content of 27 %, the metal transformation rate of sponge iron used for general metallurgy is up to 90 %. But the optimal carbon content is 29 % for iron sponge to treat DSD acid oxidation wastewater. Under condition of the wastewater＇ s pH value of 3 to 5 and the reaction time of 40 min, the removal rates of CODCr and color are 68 % and 90 %, respectively. The BOD/COD ratio is up to 0.425 when DSD oxidation acid water is treated with sponge iron. As Fe3C and other materials contained in sponge iron formed so innumerable micro-batteries between iron and other elements to oxidate and deoxidize the organics in wastewater, the pollutants became degradable and the biodegradation of wastewater was promoted. The micro-sponge-shape of sponge iron is so developed that its special surface area is greater and its activity is higher, so it is the best alternative of general iron powder.

关 键 词：铁泥 海绵铁 铁碳床 DSD酸 DSD酸氧化废水 

分 类 号：X703[环境科学与工程—环境工程] TF591[冶金工程—钢铁冶金]