中文摘要：

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。

英文摘要：

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.