精炼过程炉渣量对稀土收得率的影响

Influences of Slag Amount on Yield of Rare Earth in Refining Process

炉外精炼过程中,炉渣中富集氧、硫元素。在稀土钢冶炼过程中,因稀土元素活泼的化学性质,随合金加入的稀土Ce元素与炉渣中O、S元素作用形成化合物而大量留存于炉渣内,只有少部分稀土元素随钢水进入浇注环节,因此影响稀土收得率。文章对稀土元素在精炼炉渣中存在形式进行分析,通过对比试验讨论了精炼炉渣量与稀土元素Ce收得率之间关系,结果显示稀土Ce在精炼炉渣中以氧化物、硫化物以及硫氧化物复合形态存在,同时精炼炉渣量对稀土Ce收得率产生影响。讨论结果为工业生产过程提高稀土Ce元素收得率提供理论依据。

In the external refining process,the elements of oxygen and sulfur are enriched in slag.In the process of smelting rare earth steel,the yield of rare earth is influenced.The reason is that the rare earth element Ce added with alloy reacts with the elements of O and S in slag to form compound so that a lot of rare earth elements remain in slag as well as just a small amount of them are into the link of pouring with liquid steel because of the active chemical property of rare earth elements.In the paper,the relation between refining slag amount and yield of rare earth element Ce is discussed through contrast test and analyzing the existence forms of rare earth element in refining slag.The results showed that the rare earth Ce in refining slag existed in the compound forms of oxides,sulfides and oxysulfides as well as the amount of refining slag affected the yield of rare earth Ce,which could provide the theoretical basis for improving it in industrial production process.