Stabilization of chromium-bearing electroplating sludge with MSWI fly ash-based Friedel matrices

• Published in: Journal of hazardous materials Vol. 165; no. 1; pp. 955 - 960
• Main Authors: Qian, Guangren, Yang, Xiaoyan, Dong, Shixiang, Zhou, Jizhi, Sun, Ying, Xu, Yunfeng, Liu, Qiang
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 15-06-2009; Elsevier
• Subjects: Aluminum; Applied sciences; Carbon - chemistry; Chemical engineering; Chromium - chemistry; Chromium-bearing electroplating sludge; Coal Ash; Crystallization, leaching, miscellaneous separations; Electroplating; Exact sciences and technology; Friedel matrix; General treatment and storage processes; Metals, Heavy; Minerals; MSWI fly ash; Particulate Matter - chemistry; Pollution; Sewage - chemistry; Stabilization/solidification; Wastes; MSWI fly ash; Chromium-bearing electroplating sludge; Friedel matrix; Stabilization/solidification; Ettringite; Hydration; Pollutant behavior; Stabilization; Waste treatment; Metallurgical industry; Raw materials; Compressive strength; Heavy metal; Solidification; Transport process; Fly ash; Electrodeposition; Lixiviation; Speciation
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2008.10.078

This work investigated the feasibility and effectiveness of MSWI fly ash-based Friedel matrices on stabilizing/solidifying industrial chromium-bearing electroplating sludge using MSWI fly ash as the main raw material with a small addition of active aluminum. The compressive strength, leaching behavior and chemical speciation of heavy metals and hydration phases of matrices were characterized by TCLP, XRD, FTIR and other experimental methods. The results revealed that MSWI fly ash-based Friedel matrices could effectively stabilize chromium-bearing electroplating sludge, the formed ettringite and Friedel phases played a significant role in the fixation of heavy metals in electroplating sludge. The co-disposal of chromium-bearing electroplating sludge and MSWI fly ash-based Friedel matrices with a small addition of active aluminum is promising to be an effective way of stabilizing chromium-bearing electroplating sludge.