A kind of iron ore pre-reduction sintering method and its device

Abstract

The invention provides an iron ore pre-reduction sintering method. The method comprises the steps that firstly, a traditional mixture is prepared, iron ore powder, a solvent and fuel are subjected to raw material matching, mixing and granulating are conducted, and the traditional mixture is obtained; secondly, a pre-reduction mixture is prepared, after the iron ore powder, an additive and the fuel are evenly mixed, pelleting is conducted, carbon-burdened pellets are obtained and placed in a cylinder mixer, fuel fine powder and quick lime or slaked lime are added for wrapping and granulating, and the pre-reduction mixture is obtained; thirdly, material distribution is conducted, a double-layer material distribution manner is adopted, the pre-reduction mixer prepared in the second step is placed on a sintering machine trolley in advance, and the traditional mixture prepared in the first step is placed on the pre-reduction mixture; and fourthly, sintering is conducted, ignition is conducted, and the traditional mixture and the pre-reduction mixture are subjected to smoke circulation type sintering on a sintering machine. The problem that CO smoke is hard to treat is solved, secondary oxidization in the pre-reduction sinter reducing process is reduced, the combustion atmosphere between material layers is improved, the material temperature is increased, and generation of the iron ore material reducing reaction is accelerated.

Description

technical field [0001] The invention relates to an iron ore sintering method and device, more specifically an iron ore pre-reduction sintering method and a device thereof, belonging to the field of iron ore sintering. Background technique [0002] At present, blast furnace ironmaking is the main technology in my country, sintering ore accounts for 70% to 90% of the raw materials into the furnace, and the energy consumption of sintering process accounts for 10% to 15% of ironmaking energy consumption. Inferior question. Traditional sintering process such as figure 1 As shown, the traditional iron ore sintering process mainly uses coke powder and anthracite as fuel to provide heat for the sintering process, and adopts the method of draft sintering to produce high-alkalinity sinter with calcium ferrite as the binder phase. [0003] Japan's JFE first proposed the concept of pre-reduction sinter. As a new technology that has not yet been applied industrially, the pre-reduction s...

AI Technical Summary

Problems solved by technology

This invention cleverly utilizes the double-layer material distribution method, so that the upper layer of the sintering machine trolley is arranged with traditional sintering mixture, and the lower layer is arranged with pre-reduced sintering mixture. The gas treatment method, the high CO flue gas of the rear wind box is recycled, so it can solve the problem that the high CO flue gas is difficult to deal with, and at the same time reduce the re-oxidation of the pre-reduced sinter reduction process to a certain extent, and improve the material layer The combustion atmosphere between them helps to increase the temperature of the material and accelerate the reduction reaction of the iron ore material.

Images