Patent ID: 6986801
Filing Date: 2006-01-17
Classification: C21B

Abstract:
1. A method of producing a reduced iron compact in a rotary hearth reducing furnace, characterized by producing a compact with a porosity of 20-33% using a raw material powder wherein the total iron content is at least 40 mass % and wherein, among the included elements, the atomic molar ratio of carbon to oxygen chemically combined with iron and one or more members selected from the group consisting of manganese, nickel, zinc and lead is in the range of 0.5-1.5, putting said compact on the hearth of a reducing furnace equipped with a rotating hearth, and heating it for heating reduction by the heat from the combustion gas in the upper part of the furnace, such that the time of exposure to the gas atmosphere at 1200° C. or above is 1.0-3.0 times the minimum heating time (Ta) represented by formula <2> below and the maximum temperature of the gas in the furnace is no higher than 1400° C., Ta: minimum heating time (min) T: mean gas temperature in furnace zone above 1200° C. (K) V