赤铁矿渣—煤泥铁碳基复合材料的制备及除Cr(Ⅵ)性能研究  

Preparation of Iron-carbon Based Composite Material with Hematite Residue and Coal Slime and Removal of Cr(Ⅵ)in Aqueous Solution

作　　者：杨慧芬[1] 姜美苓 高春庆 冯筱迪 周轶臣 李萱 YANG Huifen;JIANG Meiling;GAO Chunqing;FENG Xiaodi;ZHOU Yichen;LI Xuan(School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;Sinosteel Maanshan General Institute of Mining Research Co.,Ltd.,Maanshan 243000,China)

机构地区：[1]北京科技大学土木与资源工程学院,北京100083 [2]中钢集团马鞍山矿山研究总院股份有限公司,安徽马鞍山243000

出　　处：《金属矿山》2023年第1期269-275,共7页Metal Mine

基　　金：矿物加工科学与技术国家重点实验室开放基金项目(编号:BGRIMM-KJSKL-2019-15)。

摘　　要：为探究赤铁矿渣和煤泥的高附加值利用途径,通过高温还原法制备铁碳基复合材料并将其用于Cr(Ⅵ)的吸附研究,利用SEM-EDS、XRD及XPS进行吸附机理研究。结果表明,所制材料主要含Fe、C、S 3种元素,其摩尔比为24∶62∶14。Fe、C元素构成铁碳基复合材料的基本结构,FeO、FeS和Al_(2)O_(3)·SiO_(2)不均匀地镶嵌在复合材料的结构中。这种材料对水中Cr(Ⅵ)具有较好的去除性能。在Cr(Ⅵ)初始浓度100 mg/L、初始pH=2的溶液中,投加3 g/L铁碳基复合材料,25℃振荡反应60 min,水中Cr(Ⅵ)的去除率可达99.87%,材料的最大吸附量可达86.88 mg/g。水中Cr(Ⅵ)的去除,是因为Cr(Ⅵ)能与铁碳基材料表面的Fe发生还原反应生成Fe^(2+)和Cr(Ⅲ),再进一步与材料表面OH^(-)、S^(2-)结合生成稳定的FeCr_(2)O_(4)和FeCr_(2)S_(4),沉积在铁碳基材料表面。以上研究为赤铁矿渣和煤泥制备铁碳基复合材料及其应用提供了理论和技术指导。In order to utilize hematite residue and coal slime with high-value added methods,an iron-carbon based composite material was prepared by high temperature reduction and it is used for Cr(Ⅵ)removal.The adsorption mechanism of Cr(Ⅵ)in aqueous solution were subsequently studied by SEM-EDS、XRD and XPS.The results showed that the prepared composite material mainly contains element Fe,C and S,and its molar ratio is 24∶62∶14.Element Fe and C constitute the structure of the iron-carbon based composite material,and Fe O,FeS and Al_(2)O_(3)·SiO_(2)are unevenly embedded in it.This material has good removal performance on Cr(Ⅵ)in water.Under the conditions that the Cr(Ⅵ)initial concentration was 100 mg/L with initial pH value of 2,iron carbon-based material was 3 g/L and temperature was 25℃for 60 min,the removal efficiency of Cr(Ⅵ)reached the maximum of 99.87%,and the maximum adsorption capacity of the composite material was 86.88mg/g.The removal of Cr(Ⅵ)is mainly because Cr(Ⅵ)in aqueous solution can react with Fe on composite surface to produce Fe^(2+)and Cr(Ⅲ),and then further combine with OH^(-)and S^(2-)on the surface to form stable FeCr_(2)O_(4)and FeCr_(2)S_(4),which are deposited on the surface of iron carbon-based material.The above studies provide the theoretical and technical guidance for the preparation and application of iron carbon-based composites using hematite residue and coal slime as raw material.

关 键 词：赤铁矿渣 煤泥 铁碳基复合材料 Cr(Ⅵ) 吸附机理 

分 类 号：X703[环境科学与工程—环境工程]