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Experimental Study on Dechlorination of Cold-Rolling Sludge at High-Temperature Roasting

  • Yi Li
  • Hongwei ChengEmail author
  • Guangshi Li
  • Xiaoyong Mei
  • Xionggang LuEmail author
  • Qian Xu
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

Hitherto, the iron content after cold-rolling sludge dehydration in iron and steel enterprises has reached up to 60%. However, it contains a lot of chlorine, which is the source of dioxins. And the presence of chlorine makes the cold-rolling sludge possess highly corrosivity, causing great trouble in the reproduction process. Therefore, dechlorinating experiments on cold-rolling sludge are of great significance. In this paper, we proposed an efficient way to dechlorinate the cold-rolling sludge by using high-temperature roasting method. XRD, SEM and other analytical methods were carried out to characterize the sludge. For comparison, the samples were heated from 200 to 500 °C for 2 h under air atmosphere. The dechlorinating efficiency reaches a very high value of 99%, and the main phase of final product is Fe2O3. In addition, we analysed the reaction mechanism and clarified the removal form of chlorine in the roasting process. These findings open up a promising avenue for steel enterprises to deal with cold-rolling sludge.

Keywords

Cold-rolling sludge Dechlorination Roasting 

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  1. 1.State Key Laboratory of Advanced Special Steel & School of Materials Science and EngineeringShanghai UniversityShanghaiChina

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