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Method for producing starting material for sintering

A manufacturing method and technology of raw materials, which are applied in the field of manufacturing raw materials for sintering, can solve the problems of reduced granulation strength, reduced usage, and uneven firing of granulators, and achieve the advantages of suppressing scattering, increasing particle size, and easy handling Effect

Active Publication Date: 2013-04-10
JFE STEEL CORP
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  • Abstract
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  • Application Information

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Problems solved by technology

However, due to the current increase in the price of fine powder iron ore, the amount of use has decreased and the granulation strength of the granulator has decreased.
It can be seen that, when still using the production methods of raw materials for sintering described in the above-mentioned patent documents 1 to 3, if the operation is carried out under the situation of maintaining a small quasi-particle size, the air permeability will be poor, and firing unevenness will easily occur. therefore needs to be improved

Method used

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  • Method for producing starting material for sintering
  • Method for producing starting material for sintering
  • Method for producing starting material for sintering

Examples

Experimental program
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Embodiment 1

[0132] Such as figure 2 As shown, iron ore and SiO-containing 2 Raw materials are charged into the tumble mixer 1 for agitation and mixing from the charging port to produce mixed raw materials. It should be noted that, as a SiO-containing 2 As the raw material, silica or nickel slag was used. Next, the mixed raw material is charged into the pan granulator 2, and granulated in the pan granulator 2 to obtain quasi-particles. Next, the obtained quasi-particles were packed into the tumble mixer 3 for outer layer formation, and the residence time until the quasi-particles reached the outlet of the tumble mixer 3 for outer layer formation was 40 seconds. Limestone-based raw material powder with an average particle diameter of 1.2 mm is 10% by mass of limestone, and the residence time until it reaches the discharge port of the tumble mixer 3 for outer layer formation is 20 seconds. Added as a solid fuel-based raw material 4% by mass of coke powder with an average particle diamet...

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Abstract

Provided is a method for producing a starting material for sintering, wherein it is possible to improve productivity compared to conventional methods by effectively using high-carbon dust during the process in which the surface of pseudo particles is being covered with a solid-fuel-based powder starting material. When forming a limestone-based powder starting material base layer by supplying a limestone-based powder starting material to the surface of pseudo particles obtained by granulating a material containing SiO2 and iron ore and when forming a solid-fuel-based powder starting material outermost layer by supplying a solid-fuel-based powder starting material on the limestone-based powder starting material base layer, a solid-fuel-based powder starting material containing 5 to 40 mass% of high-carbon dust is used as the solid-fuel-based powder starting material.

Description

technical field [0001] The present invention relates to a method for producing raw materials for sintering, comprising producing sintered ore for blast furnaces using a downward suction type DL type sintering machine (Dwight-Lloyd sintering machine) after granulating with a pan granulator. Background technique [0002] The sintered ore used as a raw material for a blast furnace is generally produced through the processing method of the sintered raw material as described below. [0003] That is, first, iron ore with a particle size of 10 mm or less, SiO-containing slag composed of silica, serpentinite, or nickel slag, etc. 2 Raw material, limestone-based raw material powder containing CaO such as limestone, and solid fuel-based raw material powder used as a heat source such as powdered coke or anthracite are mixed and granulated while adding an appropriate amount of water to form what is called quasi-particles. Granulated matter. The mixed raw material composed of the quasi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16
CPCC22B1/20C22B1/245Y02P10/20
Inventor 樋口隆英大山伸幸竹内直幸主代晃一
Owner JFE STEEL CORP
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