控制侧吹炉四氧化三铁含量的生产实践

Production Practice of Controlling Ferroferric Oxide Content in Side-blowing Furnace

侧吹炉采用富氧空气氧化熔炼铜精矿的过程中会生成一定量的四氧化三铁。当渣中四氧化三铁含量较高时,会导致熔体粘度增加,使熔池内形成炉结,进而导致炉底上升,熔池的容积降低,严重时可产生泡沫渣,造成喷炉事故。本文结合侧吹炉的生产实践,对侧吹炉熔炼过程中四氧化三铁的产生及控制措施进行了探讨,并介绍了各部位四氧化三铁的消除措施。结果表明四氧化三铁产生的原因主要是原料带入及炉渣过氧化,生产中,可采取控制原料中四氧化三铁含量和高熔点的杂质含量、调整煤的加入量、添加适量的石英石等措施控制四氧化三铁含量。

A certain amount of ferroferric oxide will be produced in the process of smelting concentrate by oxygen-enriched air oxidation in side-blowing furnace.When the ferroferric oxide content in slag is too high,the viscosity of melt will increase and accretion will form in the bath to make the furnace bottom rise so as to reduce the bath volume.In more serious situation,the foamed slag will be produced,resulting in slag-spillage accident.In this article,by combining the production practice of side-blowing smelting furnace,the ferroferric oxide generation in smelting process in side-blowing furnace and controlling measures were discussed,and the elimination measures of ferroferric oxide in various parts were introduced.The results show that the main cause of ferroferric oxide is its inclusion in raw material and slag peroxidation.In production,the ferroferric oxide content can be controlled by means of controlling the content of ferroferric oxide and high-melting-point impurities in raw material,adjusting coal feed amount,adding appropriate amount of quartz and other measures.