Study on stainless steel pickling bath sludge used as the cement raw materials

• 1、Wuhan University of Technology Hubei Province Wuhan

Abstract：This article aims to explore the use of stainless steel pickling bath sludge replace iron in the Portland cement raw material to be used burning cement clinker, and the clinker is analyzed by the burnability, XRD, SEM, EDS and tested analysis of the Compressive strength and heavy metal leaching. The results show that the sludge suitable parameter is about 5%. More sludge mixed that F element will be increased and content easy to produce 3C3S • CaF2. Amount of sludge incorporation, the elements of F, Cr and others have obvious mineralization agent performance on the burnability. At high temperature conditions, The heavy metals Cr, Ni have being kept into the clinker phases and mineral structure through solid phase reaction and high-temperature liquid-phase, the results show that Cr easily enriched in the C2S minerals, followed by the middle phase, while Ni is more easily cured in the C3S and intermediate phase, the leaching amount of far below the national standard to allow indicators.

Keywords： stainless steel pickling bath sludge portland cement clinker heavy metal