Coating material for inhibiting excessive bonding of iron ore pellets in smelting reduction and preparation method thereof

A technology of coating materials and iron ore pellets, which is applied in the field of smelting reduction ironmaking, can solve the problems of excessive bonding of iron ore pellets, achieve the effects of inhibiting excessive bonding, reducing the probability of bonding, and preventing large-scale cracking or falling off

Active Publication Date: 2018-08-21
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve the problem that iron ore pellets are prone to excessive bonding in the smelting reduction ironmaking production represented by the COREX method, and to provide a coating material for inhibiting excessive bonding of iron ore pellets in smelting reduction and its preparation method

Method used

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  • Coating material for inhibiting excessive bonding of iron ore pellets in smelting reduction and preparation method thereof
  • Coating material for inhibiting excessive bonding of iron ore pellets in smelting reduction and preparation method thereof
  • Coating material for inhibiting excessive bonding of iron ore pellets in smelting reduction and preparation method thereof

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Embodiment 1

[0037] A coating material for inhibiting excessive bonding of iron ore pellets in smelting reduction of the present embodiment is composed of the following components in weight percentage: 84.5% of high melting point inorganic materials, 7.5% of waste plastics, 1.0% of sodium carboxymethyl cellulose, Starch 4.5%, calcium lignosulfonate 2.5%. Among them, the high melting point inorganic material is composed of α-alumina, aluminum hydroxide and magnesium aluminum spinel, and the above-mentioned components are composed as follows in parts by mass: 45 parts of α-alumina, 24 parts of aluminum hydroxide, 20 servings. In the high-melting-point inorganic material of this embodiment, the mass with a particle size of less than 200 mesh accounts for ≥95% of the total mass of the high-melting-point inorganic material, and the Al in α-alumina 2 o 3 The mass percentage content is not less than 95%, in magnesium aluminum spinel (MgO+Al 2 o 3 ) The mass percent content is not less than 98...

Embodiment 2

[0056] A coating material for inhibiting excessive bonding of iron ore pellets in smelting reduction of the present embodiment is composed of the following components in weight percentage: 94.2% of high melting point inorganic materials, 2.5% of waste plastics, 0.2% of sodium carboxymethylcellulose, Starch 1.2%, calcium lignosulfonate 1.9%. Among them, the high melting point inorganic material is composed of α-alumina, aluminum hydroxide and magnesium aluminum spinel, and the above-mentioned components are composed as follows in parts by mass: Stone 6 parts. In the high-melting-point inorganic material of this embodiment, the mass with a particle size of less than 200 mesh accounts for ≥95% of the total mass of the high-melting-point inorganic material, and the Al in α-alumina 2 o 3 The mass percentage content is not less than 95%, in magnesium aluminum spinel (MgO+Al 2 o 3 ) The mass percent content is not less than 98%. The waste plastics of this embodiment is a mixture...

Embodiment 3

[0066] A coating material for inhibiting excessive bonding of iron ore pellets in smelting reduction of the present embodiment is composed of the following components in weight percentage: 89.5% of high melting point inorganic materials, 5.0% of waste plastics, 2.8% of sodium carboxymethyl cellulose, Starch 2.5%, calcium lignosulfonate 0.2%. Among them, the high melting point inorganic material is composed of α-alumina, aluminum hydroxide and magnesium aluminum spinel, and the above-mentioned components are composed as follows in parts by mass: 57 parts of Stone 15 parts. Described waste plastics is the mixture that is made up of polypropylene (PP), polystyrene (PS) and polyethylene terephthalate (PET), and each component of this mixture is made up as follows by weight percentage: Polypropylene (PP) 20%, polystyrene (PS) 10%, polyethylene terephthalate (PET) 70%.

[0067] The preparation method of the above-mentioned coating material for inhibiting the excessive bonding of i...

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Abstract

The invention discloses a coating material for inhibiting excessive bonding of iron ore pellets in smelting reduction and a preparation method thereof, belonging to the technical field of smelting reduction ironmaking. The coating material of the present invention is composed of the following components in weight percentage: 83-95% of high melting point inorganic materials, 2-8.5% of waste plastics, 0.2%-3% of sodium carboxymethyl cellulose, 1.2%-4.5% of starch, Calcium lignosulfonate 0.1%-2.5%; the preparation method of the coating material of the present invention comprises the following steps: coating raw material pretreatment, coating material preparation, coating material coating and drying. The coating material of the present invention can effectively inhibit the excessive bonding between iron ore pellets in the pre-reduction process of the smelting reduction ironmaking process, and the coating material and the iron ore pellets are closely combined, which can effectively prevent the coating from cracking and falling off, and at the same time ensure The metallization rate of the reduced product is at a high level.

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 excessive bonding of iron ore pellets smelting reduction and a preparation method thereof. Background technique [0002] Coal-free ironmaking is one of the cutting-edge technologies in the modern metallurgical industry. According to process characteristics and product types, it can be divided into two categories: direct reduction and smelting reduction. The direct reduction method refers to "the method of obtaining metallized products by reducing the natural ore (powder) or artificial agglomerate below the softening temperature of natural ore (powder) or artificial agglomerates by using gaseous fuel, liquid fuel or non-coking coal as energy and reducing agent". There are Midrex method, HYL method, rotary kiln method and rotary hearth furnace method, etc. The smelting reduction method refers to "the method of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/02C22B1/00
CPCC21B13/008C21B13/02C22B1/00
Inventor 孟庆民李家新狄瞻霞龙红明王平春铁军杨佳龙余正伟魏汝飞李正一
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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