45 t AOD精炼304不锈钢的造渣工艺实践

为降低AOD精炼的渣料和还原剂硅铁用量,对高铬钢液脱碳及还原过程渣碱度控制进行热力学分析,并进行45 t AOD冶炼304不锈钢造渣工艺试验。试生产结果表明,降低AOD精炼304不锈钢脱碳期炉渣碱度可减少钢水铬的氧化,同时有效减少AOD精炼渣料和还原剂消耗;AOD精炼过程石灰加入量平均从104.2 kg/t降至84.2~93.1 kg/t时,脱碳期炉渣碱度由平均13.44降低到10.64,AOD冶炼过程石灰、萤石、硅铁单耗分别平均降低14.7、5.4、4.4 kg/t,钢中Cr收得率、Ni收得率和硫含量分别为99.0%、98.3%和0.0025%。

Practice of Slagging Process for 304 Stainless Steel Refining by 45 t AOD Process

In order to reduce AOD refining slag amount and ferrosilicon amount, the thermodynamic analysis on high chromium steel liquid decarburization and slag basicity control in reducing process and the commercial test on slagging process for 304 stainless steel refining by 45 t AOD unit have been carried out. Pilot production results show that with decreasing slag basicity in decarburization period of 304 stainless steel during AOD refining, the oxidization of chromium in liquid shall be decreased, while it is available to decrease the consumption of AOD refining slag materials and reducing matter； during AOD refining process with decreasing the lime adding amount from average 104.2 kg/t to 84.2-93.1 kg/ t during AOD refining process the average basicity of slag decreases from 13. 44 to 10. 64 in decarburization period and the lime, fluorite and ferrosilicon consumption respectively reduce by 14.7 kg/t, 5.4 kg/t and 4.4 kg/t, and the yield of Cr, yield of Ni and sulphur content in steel are respectively 99.0% , 98.3% and 0.0025%.