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Desiliconization agent for molten iron and preparation and using methods for desiliconization agent

A desiliconization agent and molten iron technology, which is applied in the field of iron and steel metallurgy, can solve the problems of long time consumption, serious temperature drop of molten iron, and increased cost of desiliconization, and achieve the effect of good thermodynamic conditions and kinetic conditions, and little influence of molten iron temperature

Inactive Publication Date: 2013-02-13
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the current hot metal pre-desilication technology, it is often necessary to add special devices or injection equipment, which complicates the process operation and takes a long time, resulting in a serious drop in the temperature of the molten iron; Silicon cost increases

Method used

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  • Desiliconization agent for molten iron and preparation and using methods for desiliconization agent
  • Desiliconization agent for molten iron and preparation and using methods for desiliconization agent
  • Desiliconization agent for molten iron and preparation and using methods for desiliconization agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Fluorite powder (CaF 2 The mass percentage is 91%) 5%, water glass 8%, and the rest are blast furnace gas ash and iron oxide scale that are reasonably matched according to (C / O)=1.15. The glass is stirred again, and after mixing evenly, the final mixture is compacted with a ball press to form a lump, and after the lump is dried, it is the desiliconization agent of the present invention.

[0019] Put 1t of desiliconizing agent into the empty molten iron tank (90t of iron content) after folding iron in the steelmaking work area, and then deploy the molten iron tank containing the desiliconizing agent to the blast furnace casting plant according to the normal operation, and wait for the blast furnace to cast iron. Put the molten iron into the molten iron, and then complete the desiliconization process when the molten iron is turned into steelmaking and iron folding. Take the iron and slag samples to test the components before folding the iron (as shown in Table 1). After ...

Embodiment 2

[0023] Fluorite powder (CaF 2 The mass percentage content is 93%) 9%, and the rest is blast furnace gas ash, blast furnace dust removal ash, converter ash, iron oxide scale, and iron red that are reasonably matched according to (C / O)=1.2, and the materials are stirred and mixed by a mixer Finally, inject 8% water of the total weight of the above-mentioned materials and stir again. After mixing evenly, the final mixture is briquetted with a briquette machine to make agglomerates. After the agglomerates are dried, they become the desiliconization agent of the present invention.

[0024] Put 6t of desiliconizing agent into the empty torpedo cans (230t of iron) after folding iron in the steelmaking work area, and then deploy the torpedo cans containing the desiliconizing agent to the blast furnace casting yard according to normal operations, and wait for the blast furnace to cast iron. Put molten iron into the torpedo tank and complete the desiliconization process when steelmaking...

Embodiment 3

[0028] Fluorite powder (CaF 2 The mass percentage content is 93%) 7%, bentonite 2%, and the rest is CDQ dust removal dust, blast furnace dust removal dust, iron oxide scale, and iron red that are reasonably matched according to (C / O)=1.1. After stirring and mixing, inject 6% of the total weight of the above materials into water and stir again. After mixing evenly, the final mixture is pressed with a ball press to form a lump. After the lump is dried, it is the desiliconization of the present invention. agent.

[0029] Put 2t of desiliconizing agent into the empty molten iron tank (90t of iron content) after folding iron in the steelmaking work area, and then deploy the molten iron tank with desiliconizing agent to the blast furnace casting plant according to the normal operation, and wait for the blast furnace to cast iron. Put the molten iron into the molten iron, and then complete the desiliconization process when the molten iron tank is used for steelmaking and iron foldin...

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Abstract

The invention discloses a desiliconization agent for molten iron and preparation and using methods for the desiliconization agent. The desiliconization agent comprises the following components in percentage by mass: 4 to 10 percent of fluorite powder, 0 to 10 percent of binder and the balance of two or more of blast furnace gas ash, blast furnace dedusting ash, dry quenching dedusting ash, converter ash, scale and allite red solid waste resources, wherein the molar ratio of fixed carbon in the total components to oxygen atoms in an iron oxide (C / O) is 1.1 to 1.2. The preparation method comprises the following steps of: preparing chemical components of raw materials; putting solid materials into a mixing machine for stirring and mixing uniformly; filling water or liquid binder for secondary stirring and mixing uniformly; conveying the final mixture into a ball pressing machine and pressing to form blocks; and drying the blocks. During use, the desiliconization agent which is 1 to 3 percent of the mass of iron in a molten iron ladle can is charged into an empty molten iron ladle, the molten iron ladle which is filled with the desiliconization agent is allocated to a blast furnace casting house, the molten iron is filled during blast furnace casting, and the molten iron ladle can be conveyed to the position where iron is folded during steelmaking so as to finish desiliconization.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and mainly relates to the pretreatment technology of molten iron, in particular to a desiliconizing agent for molten iron and a method for desiliconizing molten iron. Background technique [0002] With the continuous improvement of steel quality requirements and the development of steelmaking technology, hot metal pretreatment has developed from the initial single desulfurization to desiliconization, dephosphorization, desulfurization, that is, the "full treatment" technology of hot metal. Among them, pre-desiliconization of molten iron with high silicon content is beneficial to reduce steelmaking costs and improve smelting quality. However, due to the limitations of desiliconization technology and equipment, the domestic metallurgical industry has not yet adopted desiliconization technology as a whole. Only in Japan and other countries develop rapidly. [0003] The desiliconiz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/04
Inventor 张伟张立国王相力王再义郭天永邓伟韩子文王亮
Owner ANGANG STEEL CO LTD
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