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Coating material capable of restraining pellet binding inside COREX shaft furnace and preparation and application method thereof

A technology of coating materials and pellets, which is applied in the field of smelting reduction ironmaking, can solve the problems of affecting the forward movement of the pre-reduction shaft furnace, reducing the efficiency of equipment use, and poor air permeability of the material column, so as to increase the burden of smelting, ensure the use effect, The effect of inhibiting adhesion

Active Publication Date: 2016-12-07
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to overcome the tendency of the pellets in the shaft furnace to bond easily in the existing COREX melting ironmaking process in my country, which leads to poor air permeability of the material column, seriously affects the forward movement of the pre-reduction shaft furnace, and reduces the efficiency of equipment use , which increases the cost of ironmaking, and provides a coating material for inhibiting pellet bonding in the COREX shaft furnace and its preparation and use method

Method used

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  • Coating material capable of restraining pellet binding inside COREX shaft furnace and preparation and application method thereof
  • Coating material capable of restraining pellet binding inside COREX shaft furnace and preparation and application method thereof
  • Coating material capable of restraining pellet binding inside COREX shaft furnace and preparation and application method thereof

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Effect test

Embodiment 1

[0042] A kind of coating material that suppresses the pellet bonding in the COREX shaft furnace of the present embodiment, this coating material is made of lightly burned dolomite, Ca(OH) 2 , anthracite and water mixture, light burnt dolomite, Ca(OH) 2 The mass ratio of anthracite and anthracite is 6:1:2, and lightly burned dolomite, Ca(OH) 2 The sum of the mass of anthracite and anthracite accounts for 35% of the total mass of the mixed liquor. By selecting light burnt dolomite, Ca(OH) 2 and anthracite as a solid inhibitor, and optimize the mass ratio of each component and the mass concentration of the mixed solution, so as to ensure that the cohesion between pellets in the COREX shaft furnace can be effectively suppressed while still maintaining a high metal concentration. The rate of metallization can be reduced to prevent the reduction of metallization rate, and the coating material can be evenly coated on the surface of the pellets, and the combination of the coating ma...

Embodiment 2

[0066] A kind of coating material that suppresses the pellet bonding in the COREX shaft furnace of the present embodiment, this coating material is made of lightly burned dolomite, Ca(OH) 2 , anthracite and water mixture, light burnt dolomite, Ca(OH) 2 The mass ratio of anthracite and anthracite is 4:1:2, and lightly burned dolomite, Ca(OH) 2 The sum of the mass of anthracite and anthracite accounts for 30% of the total mass of the mixed liquor. The mass percent content of (MgO+CaO) in the lightly burned dolomite powder of this embodiment>70%, SiO 2 The mass percentage content of 2 The mass percentage of powders with a particle size of less than 75 μm in the powder is greater than 85%; the anthracite is a low melting point biomass additive containing only carbon and hydrogen, its melting point is less than 700 ° C, and the mass of the powder with a particle size of less than 105 μm in the anthracite Percent > 85%.

[0067] A method of using the coating material for inhibiti...

Embodiment 3

[0073] A kind of coating material that suppresses the pellet bonding in the COREX shaft furnace of the present embodiment, this coating material is made of lightly burned dolomite, Ca(OH) 2 , anthracite and water mixture, light burnt dolomite, Ca(OH) 2 The mass ratio of anthracite and anthracite is 5:1:2, and lightly burned dolomite, Ca(OH) 2 The sum of the mass of anthracite and anthracite accounts for 33% of the total mass of the mixed liquor. The mass percent content of (MgO+CaO) in the lightly burned dolomite powder of this embodiment>70%, SiO 2 The mass percentage content of 2 The mass percentage of powders with a particle size of less than 75 μm in the powder is greater than 85%; the anthracite is a low melting point biomass additive containing only carbon and hydrogen, its melting point is less than 700 ° C, and the mass of the powder with a particle size of less than 105 μm in the anthracite Percent > 85%.

[0074] A method of using the coating material for inhibiti...

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Abstract

The invention discloses a coating material capable of restraining pellet binding inside a COREX shaft furnace and a preparation and application method thereof, and belongs to the technical field of smelting reduction iron-making. The coating material is composed of soft calcined dolomite, Ca(OH)2, anthracite and water. The mass proportion of the soft calcined dolomite to the Ca(OH)2 to the anthracite is 6:1:2-4:1:2. The mass sum of the soft calcined dolomite, the Ca(OH)2 and the anthracite accounts for 30%-35% of the total mass of coating mixed liquor. The preparation method of the coating material includes the following steps that (1) green pellets are roasted to form oxidized pellets; (2) the surface of each oxidized pellet is coated so that coating pellets can be prepared; and (3) the coating pellets achieve reduction. By means of the coating material capable of restraining pellet binding inside the COREX shaft furnace and the preparation and application method thereof, the binding phenomenon happening between the pellets inside the COREX shaft furnace can be effectively avoided; and meanwhile the metallization ratio cannot be lowered, direct motion of the shaft furnace and quality of the obtained product are guaranteed, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of smelting reduction ironmaking, and more specifically relates to a coating material for inhibiting pellet bonding in a COREX shaft furnace and a preparation and application method thereof. Background technique [0002] The blast furnace-based ironmaking system (including coking, sintering, sintering pellets, and blast furnace) has been applied and developed for hundreds of years, and has the advantages of perfect technology, large production capacity, and long equipment life. But its long process, large investment, serious pollution, poor flexibility, especially the world's increasingly scarce coking coal resources, the existing coke is difficult to meet the needs of blast furnace ironmaking in terms of quantity and quality, thus prompting people to develop new ironmaking craft. [0003] Smelting reduction ironmaking is a fundamental change to the traditional blast furnace ironmaking process. The COREX pr...

Claims

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Application Information

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IPC IPC(8): C22B1/24
CPCC22B1/24
Inventor 狄瞻霞李正一龙红明孟庆民春铁军王平李家新刘颖
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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