The effect of gas composition on the properties of slag generated from high temperature gasification was studied.The proportion of crystalline phase in the slag was measured by X-ray diffraction (XRD) and the microstructure of the slag was quantitatively analyzed by CCSEM.Metal ions in acid-digested slag samples were analyzed by ICP-AES.The results indicate that,in a strongly reducing atmosphere such as 10/90 (volume ％) mixtures of CO2/H2,the Fe content of bulk slag was reduced due to the precipitation of metallic iron in molten slag.The profile of the iron content of the slag was related to the dissolved oxygen transfer in molten slag.In addition,slag generated in mildly gas composition is more stable under than that of strongly atmosphere.Some heavy metals showed the same behavior as iron in the strongly reducing atmosphere were extracted by 1M/HC1,which results in higher extraction rates for Fe,Zn,and As,Cr.
Fe precipitation Microstructure Gasification slag leaching test
Department of Applied Chemistry,Chubu Universityl 200 Matsumoto-cho,Kasugai,Aichi,4878501,Japan Department of Chemical Engineering,Anhui University of Science and Technology,Huainan,232001,China Taiheiyo cement corporation,Sakurashi,Chiba,2858655,Japan College of Materials cience and Engineering,South China University of echnology,Guangzhou,510640 Chi Shimizu Institute of Technology,3-4-17 Etchujima Koto-u,Tokyo,135-8530,Japan National Institute for Environmental Studies,Onogawa,Tsukuba,305-8506,Japan