Method for producing starting material for sintering

A manufacturing method and technology of raw materials, applied in the field of manufacturing raw materials for sintering, can solve problems such as inability to obtain sufficient effects, mixing of micro-powdered coke in the filling layer, and reduction of coke powder coating amount, so as to shorten the time for external assembly, improve productivity, Powder produces a lightening effect

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

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Problems solved by technology

[0017] However, such technology may also cause the following problems: in reducing CO 2 In the case of reducing the coke powder as a solid fuel raw material powder based on the requirements of the company, the coating amount of the coke powder will decrease, and a sufficient effect cannot be obtained.
[0023] However, since the sintering fuel produced by the above method is weak in strength of individual particles, it is broken when mixed with other sintering raw materials in a tumble mixer, and the sintering raw materials are placed in the sintering machine. When the packed bed is formed on the trolley, the mixing / existence of fine coke in the packed bed may occur unevenly
Therefore, when the so-called "sintering operation" is performed by igniting in this state, there is a problem that uneven combustion occurs in the sintering machine, and ideal operation cannot be performed.
[0024] In addition, because the fine powder coke produced by CDQ is in a dry state, dust will be generated during processing. On the other hand, since the fine powder coke produced in the wet fire extinguishing device is in a wet state, it needs to be reused after adding a drying process. Both of them have the disadvantage of increasing the cost of treatment and drying for reuse.

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
Comparison scheme
Effect test

Embodiment 1

[0144] Such as figure 1 As shown, iron ore 2 and containing SiO 2 The raw material 3 is charged into the tumble mixer 1 from the inlet for granulation. It should be noted that, as a SiO-containing 2 Raw material 3 used silica or nickel slag. In the tumble mixer 1, iron ore 2 and SiO-containing 2 Raw material 3 was granulated to become quasi-particles, and limestone with an average particle diameter of 1.2 mm was added as limestone-based raw material powder 4 at a position where the residence time of the quasi-particles reached the outlet of the tumble mixer 1 was 40 seconds. 8% by mass and 2% by mass of superfine limestone powder with an average particle size of 50 μm (combined use ratio to the total limestone: 20%), and coke powder 4 with an average particle size of 0.9 mm as solid fuel raw material powder 5 % by mass and 1% by mass of high carbon dust with an average particle diameter of 50 μm (combined use ratio to total coke: 20%). In addition, the specific addition m...

Embodiment 2

[0153] In the same manner as in Example 1, various raw materials for sintering shown in Table 3 (invention examples 2 and 3 and comparative example 3) were produced. Table 3 shows the mixing ratio of raw materials in each raw material for sintering.

[0154] Invention Example 2 is a case where 20% by mass of ultrafine limestone powder is used in combination with the total limestone, and Invention Example 3 is a combination of 20% by mass of ultrafine limestone powder with respect to the total limestone, and high-carbon powder is used in combination with the total coke. The case where the dust is 20% by mass. It is to be noted that the exterior time was 40 seconds in Invention Examples 2 and 3, and 80 seconds in Comparative Example 3.

[0155] The sintering time, yield, and productivity of the sintering raw materials thus obtained were compared and compared, and are shown in Figure 8 .

[0156] [table 3]

[0157] Mixing ratio (mass%)

[0158] Such as Figure 8 A...

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Abstract

Provided is an advantageous method for producing a starting material for sintering, wherein it is possible to improve productivity compared to conventional methods by effectively using ultrafine limestone powder and high-carbon dust during the process in which the surface of pseudo particles is being covered with a limestone-based powder starting material and a solid-fuel-based powder starting material. When the surface of pseudo particles is being covered with a limestone-based powder starting material and a solid-fuel-based powder starting material, a limestone-based powder starting material containing 5 to 40 mass% of ultrafine limestone particles is used as the limestone-based powder starting material and 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] This invention relates to the manufacturing method of the raw material for sintering used when manufacturing sintering ore using the DL type sintering machine (Dwight-Lloyd sintering machine) of a downward suction type. Background technique [0002] The sintered ore to be charged into the blast furnace is generally manufactured as follows. [0003] First, the raw materials roughly classified into the following (a) to (d) are charged into a tumble mixer, then mixed with an appropriate amount of water, and granulated to produce granular raw materials for sintering. [0004] (a) Iron ore (ore, return ore) [0005] (b) SiO containing silica, serpentinite, nickel slag, etc. 2 raw material [0006] (c) Limestone raw material powder containing CaO such as limestone [0007] (d) Coke powder, anthracite, and other solid fuel raw material powders used as heat sources [0008] Raw materials for sintering, including granulated particles formed by mixing and g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16
CPCC22B1/16C22B1/245
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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