Synergistic Preparation of Metalized Pellets Using Stainless-Steel Pickling Sludge and Blast-Furnace Bag Dust

Stainless-steel pickling sludge (SSPS) and blast-furnace bag dust (BFBD) contain heavy metals such as Ni and Cr, which are harmful to the environment. A new approach of “using waste to treat waste” is proposed, and the process of using a direct reduction method to synergistically desulfurize and ext...

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Published in:Metallurgical and materials transactions. B, Process metallurgy and materials processing science Process metallurgy and materials processing science, 2022-06, Vol.53 (3), p.1564-1582
Main Authors: Zhuang, Qingyun, Zhou, Rong, Li, Guangshi, Zhang, Yinghua, Xiong, Xiaolu, Geng, Shuhua, Zou, Xingli, Cheng, Hongwei, Zhang, Yuwen, Xu, Qian, Zhu, Kai, Lu, Xionggang
Format: Article
Language:English
Subjects:
Blast furnace gas
Blast furnace practice
Characterization and Evaluation of Materials
Chemistry and Materials Science
Chromium
Desulfurizing
Direct reduction
Dust
Flue gas
Gas pressure
Heavy metals
Iron
Materials Science
Metallic Materials
Metallizing
Nanotechnology
Original Research Article
Pellets
Pickling
Resource utilization
Roasting
Sludge
Stainless steels
Structural Materials
Surfaces and Interfaces
Thin Films
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Summary:Stainless-steel pickling sludge (SSPS) and blast-furnace bag dust (BFBD) contain heavy metals such as Ni and Cr, which are harmful to the environment. A new approach of “using waste to treat waste” is proposed, and the process of using a direct reduction method to synergistically desulfurize and extract Zn from SSPS and BFBD to prepare metalized pellets is investigated. The results show that in the reduction roasting, the Fe, Ni, and Cr oxides can be reduced to metals and exist in the form of alloy phases; the metallization rate was 87.9 pct. ZnFe 2 O 4 can also be reduced to Zn(g) at about 1000 °C and recycled in the flue gas, and the Zn extraction rate was 99.81 pct. Moreover, S was removed in the form of SO 2 flue gas, and the desulfurization rate was 45.46 pct; the remaining S was present in the form of CaS, which could be removed in the subsequent blast-furnace smelting process, reducing the SO 2 flue-gas pressure during the reduction roasting process. CaF 2 was relatively stable and mainly exists in the slag phase. The metalized pellets satisfy the requirements for a blast-furnace charge entering the furnace and can realize efficient resource utilization of SSPS and BFBD. Graphical Abstract
ISSN:1073-5615
1543-1916
DOI:10.1007/s11663-022-02466-w