Experimental Research on Production of Low-sulfur Iron Nuggets with Iron Concentrate Powder and Pulverized Coal

According to different experimental plans,reduction experiments of carbon-bearing pellets mainly composed of iron concentrate,pulverized coal,limestone and CaF₂ are carried out to analyze the production process of iron nuggets,chemical compositions and microstructure of slag and calculate the distribution of sulfur.The results show that:with reasonable experiment plans,we can get a good effect during the process of reduction,melting and separation of carbon-bearing pellet and finally iron nuggets with low sulfur in 27 min;the internal microstructure of iron nuggets principally consists of pearlite and cementite;major chemical compositions of the slag are Ca₂Mg(Si₂O₇) and Ca₃Mg(SiO₄)₂,with a very small amount of other compositions;increasing the amount of CaF₂ added decreases sulfur in iron nuggets while increases it in slag;increasing heating temperature decreases sulfur in iron nuggets while increases it in the air.