硫化改性煤矸石对Cr(Ⅵ)的解毒与固化研究  

Detoxication and Immobilization of Cr(Ⅵ)by Gangue after Modification and Vulcanization

作　　者：陈方明[1] 陈洁渝[2] 

机构地区：[1]湖北大学资源环境学院,湖北武汉430062 [2]中国地质大学(武汉)材料科学与化学工程学院,湖北武汉430074

出　　处：《环境科学与技术》2015年第4期17-20,共4页Environmental Science & Technology

基　　金：国家自然科学基金(41102025);中国地质大学生物地质与环境地质国家重点实验室开放基金(GBL21310)

摘　　要：以煤矸石为原料,以水玻璃和Na OH为改性剂,制备改性煤矸石。改性煤矸石进一步硫化,用于对Cr(Ⅵ)的解毒与固化研究,并采用XRD、FTIR、TEM/EDS、XPS等对固化产物进行检测。当硫化物与Cr(Ⅵ)的质量比大于17.5∶1时,总铬的浸出浓度小于1 mg/L,铬固化率大于99%。硫化改性煤矸石对Cr(Ⅵ)的最大固化量为1.2%。试验过程中,S2-被氧化成了S2+(平均化合价),Cr(Ⅵ)被还原成了Cr(Ⅲ),随后Cr(Ⅲ)进入非晶质结构中并被固化。The geopolymer has been prepared by gangue as raw materials, water glass and sodium hydroxide as modified agents. Detoxification and immobilization of Cr （ VI ） were researched by gangue after modification and vulcanization, and curing geopolymer was tested by XRD, FTIR, TEM/EDS and XPS. When the mass ratio of sulfide and Cr（ VI ） is more than 17.5： 1, the leaching concentrations of total chromium are less than 1 mg/L and the fixation rates of chromium are above 99%. The best fixation capacity of Cr（ VI ） is 1.2%. S2- has been oxidized to S2＋ and Cr（ Ⅵ ） has been deoxidized to Cr（Ⅲ） during the experiment. Then Cr（ llI） has been attracted by the geopolymers and fixated in the non-crystaline structures.

关 键 词：煤矸石 改性 硫化 Cr(Ⅵ) 解毒 固化 

分 类 号：X75[环境科学与工程—环境工程]