Authors: Diao, J.¹; Xie, B.²; Wang, S. S.³

Source: Ironmaking & Steelmaking, Volume 36, Number 7, October 2009 , pp. 543-547(5)

Publisher: Maney Publishing

Abstract:

To improve the slag/iron separation problems in CaO–Mg based hot metal desulphurisation, experiments were carried out to generate a more fluid slag and to reduce the amount of hot iron entrapped within the desulphurising slag. The optimised slag modifying agent effectively decreased the melting temperature and viscosity of CaO–Mg based desulphurising slag. The optimised modifying agent has been successfully applied to industrial production. Industrial tests show that the average desulphurisation exceeded 82% when using the 80CaO–15Mg–5CaF₂ desulphurising agent at 3·5–4·0 kg t^–1, and with an average final S of 0·005%. The skimming time decreased from nearly 12 min to ∼6·5 min. The heat loss during desulphurisation decreased to ∼19°C which is favourable to the subsequent steelmaking process. Average total Fe content in post-desulphurisation slag is 34% with 0·7–0·8 kg t^–1 modifying agent, a decrease of ∼30% in iron loss compared with current status.

Keywords: DESULPHURISATION; HOT METAL PRETREATMENT; MODIFYING AGENT; POST-DESULPHURISATION SLAG; VISCOSITY

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/174328109X445642

Affiliations: 1: College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China 2: College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;, Email: bingxie@cqu.edu.cn 3: Qingdao Iron and Steel Co., Ltd, Qingdao 266043, China

Publication date: 2009-10-01

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