Addition method and application of desulfurizer in blast furnace ironmaking process

A blast furnace ironmaking and desulfurizing agent technology, applied in the field of iron and steel metallurgy, can solve problems such as pipeline corrosion and pipeline blockage, and achieve the effects of improving pig iron quality, improving efficiency and reducing costs

Active Publication Date: 2016-04-06
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the desulfurizer is injected comprehensively at the tuyere of the blast furnace, the desulfurization reaction takes place in the furnace hearth. During the process of mixing and drying, the dried mixed powder of coal powder and desulfurizer is sprayed into the blast furnace through the tuyere of the blast furnace, so that not only the desulfurization reaction takes place in the hearth, but also the dried mixed powder is not easy to produce Ca( Oh) 2 , which not only solves the problem of corrosion of equipment and pipelines caused by direct injection of calcium-based desulfurizer at the tuyere of the blast furnace and blockage of pipelines, but also effectively improves the efficiency of the desulfurization reaction in the blast furnace, can effectively reduce the [S] content in pig iron, and improve the quality of pig iron. Quality, reduce pig iron cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This example is used to illustrate the method for adding desulfurizer in the blast furnace ironmaking process of the present invention.

[0030]Add a silo with an electronic scale in front of the mill in the coal workshop to load calcium oxide, weigh 100kg of calcium oxide, and send it into the mill together with 20 tons of anthracite through a belt, and the calcium oxide and anthracite are in the mill Internal grinding, mixing and drying are realized at the same time during the grinding process. The temperature of the mill is 350°C during grinding. The mixed powder of calcium oxide and anthracite is ground in the mill for 1.5 minutes. After grinding, the calcium oxide with a particle size of less than 0.074mm The mixed powder with anthracite accounts for 80% of the total weight of the mixed powder, and the water content of the dried calcium oxide and anthracite mixed powder is 0.05% by weight, and the dried mixed powder of calcium oxide and anthracite is sent to the inj...

Embodiment 2

[0034] This example is used to illustrate the method for adding desulfurizer in the blast furnace ironmaking process of the present invention.

[0035] Add a silo with an electronic scale in front of the mill in the coal workshop to load calcium carbide, weigh 60kg of calcium carbide, and send it into the mill together with 20 tons of bituminous coal through a belt, calcium carbide and bituminous coal are in the mill Internal grinding, mixing and drying are realized at the same time during the grinding process. The temperature of the mill is 350°C during grinding. The mixed powder of calcium carbide and bituminous coal is ground in the mill for 1.5 minutes. After grinding, the particle size of calcium carbide is less than 0.074mm. The mixed powder with bituminous coal accounts for 75% of the total weight of the mixed powder, and the water content of the dried mixed powder of calcium carbide and bituminous coal is 0.04% by weight, and the dried mixed powder of calcium carbide an...

Embodiment 3

[0039] This example is used to illustrate the method for adding desulfurizer in the blast furnace ironmaking process of the present invention.

[0040] Add a silo with an electronic scale in front of the mill in the coal workshop to load calcium fluoride, weigh 160kg of calcium fluoride, and send it into the mill together with 20 tons of lignite through a belt conveyor, calcium fluoride and lignite Grinding in the mill, mixing and drying at the same time during the grinding process, the temperature of the mill is 350 ° C, the mixed powder of calcium fluoride and lignite is ground in the mill for 1.5 minutes, and the particle size after grinding is less than 0.074 The mixed powder of calcium fluoride and lignite of mm accounts for 80% of the total weight of mixed powder, and the water content of the mixed powder of calcium fluoride and lignite after drying is 0.05% by weight, and the calcium fluoride and lignite after drying The mixed powder is sent to the injection tank, and t...

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Abstract

The invention discloses an adding method of a desulfurizer in a blast furnace ironmaking process and application, and the method is as follows: adding the desulfurizer into pulverized coal before coal grinding to make the desulfurizer and the pulverized coal evenly mixed and dried, spraying a mixture of the dried desulfurizer and the pulverized coal into a blast furnace by a blast furnace wind mouth. The invention also discloses application of the adding method of the desulfurizer in the blast furnace ironmaking process. According to the adding method of the desulfurizer, no corrosion to spraying equipment and pipelines and no blockage of the pipelines may be produced, the desulfurization efficiency of the blast furnace can be increased, the blast furnace ironmaking cost and (S) content in pig iron can be reduced, and the quality of the pig iron can be improved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a method for adding a desulfurizer in a blast furnace ironmaking process and its application. Background technique [0002] In recent years, the iron and steel metallurgical industry has developed rapidly, the market competition is fierce, and the profit margin of the metallurgical industry is getting thinner and thinner. The price and quality of products are related to their own market competitiveness. In the process of ironmaking, the control of pig iron cost is an important factor related to the cost of ironmaking. The control of pig iron quality seriously affects its application performance. [0003] In iron and steel materials, the [S] content directly affects its performance. Excessive [S] content in steel will lead to poor thermal processing performance of steel, resulting in "cold brittleness" of steel; in addition, it will also significantly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B5/00C21B3/02
Inventor 王戈王禹键
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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