铁酸钠对含铁矿物碳热还原过程铁粒形成的影响

摘要

通过热力学计算、动力学试验以及还原产物微观形貌扫描电镜分析，研究 Na2O·Fe2O3在Fe2O3/MgFe2O4-Na2CO3-C还原体系中的作用。结果表明：在该体系中，Na2CO3与Fe2O3或MgFe2O4快速反应生成更易被碳还原的Na2O·Fe2O3，从而降低还原反应的起始温度，并加速反应的进行；Na2O·Fe2O3还能促进含铁矿物碳热还原过程中铁晶粒的长大，有利于后续铁矿物的磁选分离。%The effects of Na2O·Fe2O3in the Fe2O3/MgFe2O4-Na2CO3-C were identified by thermodynamic calculation, kinetic research and microscopic morphology analyses of reduction products. The results show that Na2O·Fe2O3 readily reduced by carbon is rapidly formed by the reaction of Fe2O3 (or MgFe2O4) and Na2CO3, resulting in the decrease of the initial reduction reaction temperature of Fe2O3/MgFe2O4-Na2CO3-C system and the acceleration of the reduction reaction. Na2O·Fe2O3 can also promotes the growth of iron grains during the reduction process, and thus is in favor of the magnetic separation of the reduction products.