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| Experiment on stainless steel pickling sludge used as steelmaking slagging flux |
| LI Xiao-ming， WANG Jian-li， Lü Ming， YIN Wei-dong， CUI Ya-ru， ZHAO Jun-xue |
| （School of Metallurgical Engineering， Xi'an University of Architecture and Technology，
Xi'an 710055， Shaanxi， China) |
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Abstract The stainless steel pickling sludge has the characteristics of large yield， serious pollution and difficult disposal. Conventional solidified landfills occupy land and waste resources. The stainless steel pickling sludge is recycled in the steelmaking process as the slagging flux so as to recycle valuable metals of Fe， Cr， and Ni and play the functions of CaO and CaF2. Finally it will achieve the utilization of sludge resources. Thermodynamics calculation by FactSage showed that most valuable elements including Fe， Cr and Ni in the pickling sludge could be recycled into the molten metal， and the sulfur mass percent of the molten metal was up to 0.014%， which would not increase the sulfur mass percent in the molten steel. On this basis， the pickling sludge was made into a mixed slag-forming agent， and static experiments and oxygen blown experiments indicated that the sulfur mass percent could meet the requirement of molten steel， and the recovery rate of valuable metals such as Cr and Ni could reach 66.04% and 97.90% respectively when the ratio of the slagging agent and the pickling sludge was 1∶1.
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Received: 30 July 2018
Published: 25 April 2019
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2019, Vol. 54 
