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Desulfurization thermodynamics experiment of stainless steel pickling sludge

  • Xiao-ming LiEmail author
  • Ming LvEmail author
  • Wei-dong Yin
  • Jun-xue Zhao
  • Ya-ru Cui
Original Paper

Abstract

A technical idea of returning stainless steel pickling sludge to smelting process so as to recycle valuable metals of Fe, Cr, and Ni was proposed, expecting to realize sludge detoxification and resource utilization. Thermodynamics calculation showed that not only most valuable elements including Fe, Cr and Ni, but also the harmful element of sulfur in pickling sludge can be enriched into molten metal. As a result, a theoretical study on desulfurization thermodynamics of sludge pre-treatment was conducted, and results indicated that complete desulfurization temperature of pure pickling sludge was above 1400 °C. When 0.5–0.8% carbon was added as reducing agent, the complete desulfurization temperature was reduced to 1000 °C or below. Desulfurization roasting experiment indicated that desulfurization rate at 1400 °C under inert environment was 78.74% and maximum desulfurization rate at 1000 °C under reducing environment was 91.62%.

Keywords

Stainless steel Pickling sludge Pre-treatment Desulfurization thermodynamics 

Notes

Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Nos. 51574189, 51774224, 51604210) and Natural Science Basic Research Plan in Shaanxi Province of China (No. 2016JQ5042).

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Copyright information

© China Iron and Steel Research Institute Group 2018

Authors and Affiliations

  1. 1.School of Metallurgical EngineeringXi’an University of Architecture and TechnologyXi’anChina
  2. 2.Research Center of Metallurgical Engineering and Technology of Shaanxi ProvinceXi’an University of Architecture and TechnologyXi’anChina

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