Production method, production system and application of particle direct reduced iron

Abstract

The invention provides a production method, a production system and an application of particle direct reduced iron, and relates to the technical field of smelting. According to the production method, granular iron ore with a specific particle size and a specific preheating temperature is subjected to countercurrent contact with feed gas at the specific preheating temperature for a reduction reaction, and the granular direct reduced iron is obtained; the particle size of the granular iron ore is small, the reduction reaction speed at the same temperature is higher than that of traditional pellets, other binders and sintering processes do not need to be introduced, energy consumption and pollution are greatly reduced, meanwhile, the granular iron ore at the specific preheating temperature and feed gas are directly subjected to the reduction reaction, the reduction reaction at low temperature is realized by utilizing the heat of the material, and the low-temperature reduction reaction does not need a special high-temperature-resistant material, so that the bonding probability of the particle direct reduced iron in the reduction process is reduced; and the average flow velocity of the specific feed gas is adopted, so that the feed gas can be in full contact with the granular iron ore, and the utilization efficiency of the feed gas is greatly improved.

Description

technical field [0001] The invention relates to the technical field of smelting, in particular to a production method, production system and application of granular direct reduced iron. Background technique [0002] At present, there are many ironmaking technologies in the global iron and steel smelting industry, including blast furnace ironmaking technology and non-blast furnace ironmaking technology. Non-blast furnace ironmaking technology is divided into direct reduction and smelting reduction, and direct reduction is divided into gas-based reduction and coal-based reduction. . Among them, blast furnace ironmaking technology has the largest production scale and usage. In the blast furnace ironmaking process, a large amount of dust, carbon dioxide and other gases will be emitted during the coking and sintering process, which brings great pressure to the environment. In the non-blast furnace ironmaking technology, the gas-based reduction process uses reducing gas to reduce...

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Problems solved by technology

The fluidized bed technology with iron powder as the product is economical due to the long residence time of iron ore powder, low utilization efficiency of reducing gas, low metallization rate of the product, mutual adhesion between iron particles at high temperature affects fluidization, and unstable operation of the device. Due to poor efficiency and other reasons, only a very small number of factories are still in operation

[0006] Therefore, a gas-based iron ore reduction method with low reaction temperature, high utilization rate of reducing gas, and no need to introduce binder and sintering process has been researched and developed, so as to alleviate the existing iron ore gas-based shaft furnace reduction technology. Long raw material processing process, high energy consumption, high pollution, low utilization efficiency of reducing gas in gas-based fluidized bed reduction technology, low metallization rate of products, long reaction time, high energy consumption, and iron particles sticking to each other at high temperature It is very necessary and urgent to solve the problem of affecting fluidization

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