Provided is a technique for increasing the yield of reduced iron, thereby improving productivity when manufacturing reduced iron by heating an agglomerate. This method for manufacturing reduced iron includes: a step in which a mixture is agglomerated, said mixture containing an iron oxide-containing substance, a carbonaceous reducing agent, and a melting point regulator; and a step in which reduced iron is manufactured by heating the obtained agglomerate, reducing and partially melting the iron oxide in the agglomerate, and aggregating the iron component. The particle size of the fine particulate iron generated in the step in which the reduced iron is manufactured is adjusted, and the fine particulate iron is blended into the mixture.

A method for manufacturing reduced iron using the same, and more particularly, to a burning apparatus heating a coal briquette to manufacture reduced iron, which includes a first burning furnace heating the coal briquette while moving the truck accommodating the coal briquette along a linear movement path; a second burning furnace connected to the other side of the first burning furnace, and heating the coal briquette while moving the coal briquette discharged from the truck along an annular path; and a cooling device connected to the second burning furnace, and cooling the reduced iron while moving reduced iron reduced in the second burning furnace along an annular path. The burning apparatus circulates exhaust gases generated in the burning furnace and cooling device to control a temperature and an oxygen concentration and thus improves a metallization rate of the reduced iron.

A rotary hearth furnace includes a unit that supplies an agglomerate onto a hearth of the rotary hearth furnace, a unit that discharges a heated substance which has been heated in the rotary hearth furnace to the outside of the furnace, and a unit that discharges an exhaust gas in the rotary hearth furnace to the outside of the furnace. The rotary hearth furnace has a heating section and a non-heating section. The unit that discharges an exhaust gas to the outside of the furnace is provided in the non-heating section. A unit that takes an outside air into the furnace is provided in the non-heating section and on an upstream side in a flow direction of the exhaust gas from the unit that discharges exhaust gas to the outside of the furnace.

A method for producing a high purity high carbon molten chrome product from chrome and carbon bearing material, said method comprising the steps of: (a) continuously introducing chrome compacts directly into an electric melter; (b) heating and melting the chrome compacts in the electric melter at a temperature of between about 1300 C. to about 1700 C. to form high carbon molten chrome; (c) preventing oxidation of the high carbon molten chrome via minimization of the ingress of oxygen containing gas in said heating step; (d) carburizing the high carbon molten chrome to form high carbon molten metallized chrome; (e) purifying the high carbon molten metallized chrome by reducing silicon oxides to silicon and desulfurizing the high carbon molten metallized chrome to produce the high purity high carbon molten chrome product; and (f) discharging the high purity high carbon molten chrome product from the electric melter.

This method is for producing granular metallic iron in which the relation between the mass ratio (mass %) of the volatile matter content contained in a carbonaceous reducing agent and the average gas flow rate (m/s) of the ambient gas in a heating furnace fulfills expression (1). Mass ratio of volatile matter content4.62average gas flow rate+46.7 . . . (1)

Non-fired pellets are used in a solid reduction furnace and are effective in preventing clustering by reducing the possibility of contact between low-melting-temperature slags and thus preventing the fusion therebetween. A method produces such non-fired pellets. Non-fired pellets for reduction, in which the proportion of high-viscosity slag components (Al.sub.2O.sub.3+MgO+SiO.sub.2) to the total Fe (T.Fe) satisfies an expression: (Al.sub.2O.sub.3+MgO+SiO.sub.2)/T.Fe0.12, and a method for producing the same. In the expression, Al.sub.2O.sub.3 represents the concentration (mass %) of Al.sub.2O.sub.3 in the non-fired pellets, MgO represents the concentration (mass %) of MgO in the non-fired pellets, SiO.sub.2 represents the concentration (mass %) of SiO.sub.2 in the non-fired pellets, and T.Fe represents the concentration (mass %) of T.Fe in the non-fired pellets.