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| Dephosphorization influence factors in converter hot metal pretreatment |
| WANG Yu-mo1, TAO Lin2, GUO Hao-yu1, ZUO Da-wen1, WEI Jie1, YANG Shi-shan1 |
1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. Department of Materials Engineering, Henan Industrial School, Zhengzhou 450002, Henan, China |
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Abstract Dephosphorization of hot metal pretreatment in the converter is nowadays playing an important role in the production of low or super low phosphorus steel grades. Based on the pretreatment dephosphorization converter practice in “duplex converter steelmaking” process in domestic iron and steel enterprises, experimental studies on dephosphorization influence factors in converter hot metal pretreatment were imitatively carried out by top addition of dephosphorization agent and immersed blowing of gaseous oxygen in SiC electric resistance furnace of molten pig iron. The effects of different hot metal temperature, initial silicon content in hot metal w(Si)i, slag basicity, oxygen supply (the ratio of gaseous oxygen and total oxygen), stirring strength, and fluorspar addition on dephosphorization efficiency are compared. The results showed that the ranking order of different factors affecting dephosphorization ratio is hot metal temperature＞w(Si)i＞oxygen supply＞slag basicity, stirring strength＞fluorspar addition,the appropriate process parameters are the hot metal temperature of 1 300 ℃, w(Si)iof 0.10%-0.26% or less than 0.30%, slag basicity of 2.9 to 3.0, oxygen supply of 50% solid oxygen or a few more, and with stronger stirring,and the dephosphorization agent is probable without fluorspar during hot metal dephosphorization pretreatment in the converter.
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Received: 12 December 2019
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2020, Vol. 55 
