Economical method for preparing carbon-containing pellet, carbon-containing pellet prepared through method and smelting process of carbon-containing pellet

Abstract

The invention belongs to the technical field of metallurgy, and particularly relates to an economical method for preparing a carbon-containing pellet, a carbon-containing pellet prepared through the method and a smelting process of the carbon-containing pellet. The economical method for preparing the carbon-containing pellet comprises the following steps that 1, hematite powders used for preparingthe carbon-containing pellet are divided into first hematite powders and second hematite powders by the mass ratio of 0.8:1.2; 2, Fe2O3 in the first hematite powders is converted into Fe3O4 to obtainmagnetite powders; and 3, the magnetite powders obtained in the step 2, the second hematite powders in the step 1 and coal powders are mixed to obtain the carbon-containing pellet, and the mass ratioof the mass sum of the magnetite powders and the second hematite powders to the coal powders is (6-8):3. The economical method for preparing the carbon-containing pellet can effectively improve the DRI metallization rate of carbon-containing pellets, enhances the drum strength, and is capable of saving energy and economical, and the carbon-containing pellet is convenient to transport and store.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to an economical method for preparing carbon-containing pellets, the carbon-containing pellets and a smelting method thereof. Background technique [0002] Carbon-containing pellets refer to iron-containing powders combined with solid reducing agents (coal powder or coke powder, etc.) and appropriate binders, which are fully mixed and then pelletized by a pelletizer to form carbon-containing and iron-containing pellets. The carbon-containing pellets are fed into the reduction furnace to produce direct reduced iron through heating and reduction process. During this process, the interior of the carbon-containing pellets will undergo self-reduction at 900-1100°C, thereby generating a large number of "cavities", and due to the composition or structure of the carbon-containing pellets, the metallized pellets will crack or burst. It leads to problems such as poor heat tran...

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Problems solved by technology

However, there are problems that cannot be ignored in the above production and smelting methods, such as: complex production process, high cost, inability to balance strength and metallization rate, low level of material utilization, etc.

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