Research on slag modifying agents for CaO-Mg based hot metal desulphurisation
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
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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: HOT METAL PRETREATMENT; DESULPHURISATION; POST-DESULPHURISATION SLAG; MODIFYING AGENT; VISCOSITY
Document Type: Research article
DOI: 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
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