POUDRE DE FER POUR COMPOSITION EXOTHERMIQUE, SON PROCÉDÉ DE PRODUCTION, COMPOSITION EXOTHERMIQUE UTILISANT LADITE POUDRE DE FER ET PROCÉDÉ DE PRODUCTION DE CORPS EXOTHERMIQUE
An iron powder for an exothermic composition according to the present invention has a bulk density of 0.3-1.5 g/cm3. An exothermic composition according to the present invention contains said iron powder, a carbon material, a halide salt, and water. An exothermic body production method according to the present invention comprises: forming a coated body by applying, to a base material sheet, a fluidic exothermic composition containing said iron powder, a carbon material, and water； and adjusting the water content of the coated body by removing water from the coated body. The present invention also relates to a method for producing said iron powder (iron powder for an exothermic composition), said method comprising: a reduction step for obtaining reduced iron by reducing an iron oxide； and a step for pulverizing said reduced iron. At the reduction step, the iron oxide and a solid reductant having a volatile-element content of at least 10 mass% are introduced into a heating furnace, the interior of which is free from sulfur gas and which has an air or inert gas atmosphere, and said iron oxide is reduced by heat-treating under a condition that brings the temperature of the interior atmosphere to 900-1000°C so as to turn the interior of the furnace into a reducing gas atmosphere.La présente invention concerne une poudre de fer pour une composition exothermique, présentant une masse volumique apparente de 0,3 à 1,5 g/cm3. Une composition exothermique selon l'invention contient ladite poudre de fer, un matériau carboné, un sel d'halogénure et de l'eau. Un procédé de production d'un corps exothermique selon l'invention comprend : la formation d'un corps enrobé par application, sur une feuille de matériau de base, d'une composition exothermique fluide contenant ladite poudre de fer, un matériau carboné et de l'eau ； et le réglage de la teneur en eau du corps enrobé par élimination de l'eau du corps enrobé. L'invention concerne en outre un procédé de production de ladite poud
