Recycling of residual IGCC slags and their benefits as degreasers in ceramics

JOURNAL OF ENVIRONMENTAL MANAGEMENT

卷:129

Article

Iglesias Martin, I.¹  Acosta Echeverria, A.²  Garcia-Romero, E.^1,3,4 

[1] Univ Complutense Madrid, Dept Cristalog & Mineral, E-28040 Madrid, Spain

[2] Univ Castilla La Mancha, Area Mineral Aplicada, E-13071 Ciudad Real, Spain

[3] Univ Complutense Madrid, Inst Geociencias IGEO, E-28040 Madrid, Spain

[4] CSIC, Madrid 28040, Spain

关键词: IGCC slag;    Scanning electron microscopy;    Anorthite;    Devitrification;    Thermal behaviour;    Ceramic petrography;    Degreaser;   

DOI  :  10.1016/j.jenvman.2013.05.055

来源: Elsevier

【 摘 要 】

This work studies the evolution of IGCC slag grains within a ceramic matrix fired at different temperatures to investigate the effect of using IGCC slag as a degreaser. Pressed ceramic specimens from two clay mixtures are used in this study. The M1 mixture is composed of standard clays, whereas the M2 mixture is composed of the same clay mixture as M1 mixture but contains 15% by weight IGCC slag. The amount of IGCC slag added coincides with the amount of slag typically used as a degreaser in the ceramic industry. Specimens are fired at 950 degrees C, 1000 degrees C, 1050 degrees C, 1100 degrees C and 1150 degrees C. The mineralogical composition and the IGCC slag grain shape within the ceramic matrix are determined by X-ray diffraction, polarized light microscopy and scanning electron microscopy. The results reveal that the surface of the slag grains is welded to the ceramic matrix while the quartz grains are separated, which causes increased water absorption and reduces the mechanical strength. IGCC slag, however, reduces water absorption. This behaviour is due to the softening temperature of the slag. This property is quite important from an industrial viewpoint because IGCC slag can serve as an alternative to traditional degreasing agents in the ceramic building industry. Additionally, using IGCC slag allows for the transformation of waste into a secondary raw material, thereby avoiding disposal at landfills; moreover, these industrial wastes are made inert and improve the properties of ceramics. (C) 2013 Elsevier Ltd. All rights reserved.

【 授权许可】

Free