Carbon content in DRI

Carbon content in DRI helps reducing  to . Excess carbon than required to reduce would require oxygen injection. Oxygen in DRI is . Reduction of  is

(2)

                                                                              
According to reaction 2 carbon requirement is .Carbon content in excess of  would require oxygen injection and  will be generated. Excess carbon aids chemical energy which reduces electrical energy requirement. While producing DRI from carbononaceous reductant, excess carbon than reduction for requirement is to be maintained. In DRI produced from gaseous reductant, extra carbon can be mixed with DRI or otherwise carbon injection is to be done.

The amount of carbon required (in kg ) to reduce iron oxide (FeO) content of the sponge iron is as follows [@]:



Where M is the degree of metallization, Sl is the amount of slag, and Fe is the amount of iron in slag.

It must be known that DRI is non conductor of electricity. Hence hot heel (molten metal pool) is required to melt DRI. In procedure hot heel is created by melting scrap or keeping liquid metal of earlier heat. This method makes easy melting of DRIU.

Iron carbide
Other charging material is iron carbide which contains 6% carbon. It is prepared by heating iron oxide fines in a mixture of CO, CO2, methane, H2 and water vapour at temperatures between 550