玻利维亚穆通铁矿炼钢中DRI熔分的分析

Analysis of DRI Melt in the Mutun Iron and Steel in Bolivia

基于玻利维亚穆通铁矿炼钢过程中,采用孤网供电,只能选用中频感应电炉熔化海绵铁球团,由于当地钢材市场原因,可用废钢极其有限,所以要求中频电炉只能以含碳量为3%且含渣量达到16%以上的海绵铁球团为原料。通过对海绵铁球团在实验室感应炉中实验,得到了铁水收得率、确定了海绵铁球团熔化过程中的碳烧损比例和炉衬的侵蚀情况。以此为基础对直接还原铁进行研究,得到改变废钢比例对铁水收得率无明显影响,收得率保持在75%~77%,加入氧化剂之后铁水收得率保持在86%左右;碳烧损比例在60%左右,甚至能达到70%;Mg O坩埚炉衬侵蚀严重、变脆及存在大量的结瘤物。最后进行现场试验,通过对玻利维亚穆通铁矿熔炼的分析,进一步验证实验室真空感应炉系的数据,为生产实践提供了一定的参考。

In this paper,based on the Mutun iron ore mine in Bolivia,using isolated-grid power snpply,only medium-frequeny inductign furnoa can be used to melt the sponge iron pellets.Because of the limited steel market,the available scrap is only limited by carbon content of 3%and slag content of 16%or more sponge iron pellets as raw material.In this paper,the experiment of sponge iron pellets in a laboratory in?duction furnace,the yield of molten iron was obtained,and the proportion of carbon burning and the erosion of the lining of the sponge iron pel?lets were determined.Based on this,the direct reduction of iron was studied,and the ratio of scrap was changed without any significant effect on the yield of hot metal.The yield was maintained between 75%and 77%.After the addition of oxidant,the yield of hot metal remained at 86%.The proportion of carbon burning is about 60%,even up to 70%;MgO crucible lining erosion serious,brittle and there is a large number of nodulation.Finally,the field test was carried out.Based on the analysis of melting at Mutong Iron Mine in Bolivia,the data of laboratory vac?uum induction furnace system were further verified,which provided some reference for production practice.