Molten iron manufacturing device and molten iron manufacturing method using the same

Abstract

The present invention relates to a molten iron manufacturing device and a manufacturing method thereof. The molten iron manufacturing device includes: a raw material pretreatment device for screening and pretreating iron ore raw materials to make them suitable for reduction; a pre-reduction reactor comprising the The raw material pretreatment device transports the first riser of the pretreated iron ore raw material and the second riser connected to the first riser, and the iron ore raw material transported is pre-reduced by reducing gas; the reduction reactor is used for Reducing part of the reduced iron transported from the pre-reduction reactor; smelting reduction reactor, using reducing gas to smelt and reduce the part of the reduced iron obtained from the reduction reactor to produce molten iron; ironmaking by-product gas pre A treatment device for mixing and reforming iron-making by-product gas or carbon dioxide produced in the iron ore reduction process to generate reducing gas, and supplying the generated reducing gas to the smelting reduction reactor or the pre-reduction reactor; and an iron ore reduction process device for supplying carbon dioxide produced in the iron ore reduction process.

Description

technical field [0001] The present invention relates to a molten iron manufacturing device and a method for manufacturing molten iron using the device, more specifically to a method for reforming the by-product gas produced in the ironmaking process and using the generated gas to reduce fine iron ore, and at the same time through A device for producing molten iron by smelting reduction and a method for manufacturing molten iron using the device. Background technique [0002] The conventional fine iron ore reduction technology using a fluidized bed reduction reactor was a methane gas-based reduced iron production technology in the 1950s that supplied hydrogen by reforming methane-steam. U.S. Patent No. 2821471 or No. 3022156 discloses a method of producing reduced iron by fluidized reduction of iron ore mainly using 90% hydrogen reducing agent and under the conditions of reaction temperature below 600°C and pressure above 5 atmospheres U.S. Patent No. 3,246,978 discloses a t...

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Problems solved by technology

However, reduced iron production processes based on methane gas or coal (C) are mainly limited to the use of high-grade iron ores, and various fine iron ores that are not currently used (including magnetite in the form of fine powders below a few hundred microns ore) reduction is limited

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