AOD炉钼精矿直接合金化钼收得率影响因素分析

Analysis of Influence Factors for Mo Yield by Direct Alloying of Molybdenum Concentrate in AOD Furnace

以钢液中C、Si、Mn、Fe等元素还原MoO_(3)的冶金热力学为基础,在AOD炉中进行钼精矿直接合金化试验,并分析加入时机、加入方式、熔炼温度、钢液成分对AOD炉钼的收得率影响。结果表明:采用加氧化钼矿球后其上覆盖碱性炉渣的加料方式钼元素收得率最高,可达到98.33%;在加入量相同的情况下,C质量分数为0.8%时加入钼精矿,钼元素的收得率较高;[C]质量分数为4.00%的纯铁液中,1600℃时[C]还原氧化钼的速率明显高于1500℃,纯铁液中不同质量分数的[Si]还原氧化钼的速率均高于碳元素。

On the basis of the metallurgical thermodynamics on reduction of MoO_(3)by C,Si,Mn,Fe and other elements in the liquid steel,the direct alloying experiment of molybdenum concentrate is conducted in AOD furnace.The effects of feeding time,feeding method,melting temperature and steel composition on the molybdenum yield are analyzed.The results show that the highest molybdenum element yield rate can be achieved by using the feeding method of adding molybdenum oxide ore balls and covering them with alkaline slag,which can reach 98.33%;the molybdenum concentrate being added into AOD furnace with the carbon content of 0.8%can obtain higher yield at the same feeding amount;in pure iron solution with a mass fraction of 4.00%,the rate of 1600℃carbon molybdenum oxide reduction is significantly higher than 1500℃,and the rate of molybdenum oxide reduction of silicon element with different content in pure iron liquid is all higher than that of carbon.