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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 poor air permeability of granulators, and achieve the effects of suppressing scattering, easy handling, and improved combustibility

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

AI Technical Summary

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 condition of keeping 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
Comparison scheme
Effect test

Embodiment 1

[0136] Such as figure 1 As shown, the iron ore and SiO 2 The raw materials are charged into the drum mixer 1 for stirring and mixing from the inlet to produce mixed raw materials. It should be noted that as a SiO-containing 2 As raw materials, silica or nickel slag is used. Next, the mixed raw material is charged into the pan granulator 2 and granulation is performed in the pan granulator 2 to obtain quasi-particles. Next, the obtained quasi-particles were charged into the outer layer forming drum mixer 3, and the quasi-particles were added at a position where the residence time until the quasi-particles reached the outlet of the outer layer forming drum mixer 3 was 40 seconds. The limestone-like raw material powder is 8% by mass of limestone with an average particle size of 1.2mm and 2% by mass of ultrafine limestone powder with an average particle size of 50μm (combined usage ratio relative to the total limestone: 20%), and reaches the outer layer 4% by mass of coke powder w...

Embodiment 2

[0144] In the same manner as in Example 1, various raw materials for sintering shown in Table 3 (Invention Examples 2, 3 and Comparative Example 3) were produced. Table 3 shows, for example, the mixing ratio of raw materials in each raw material for sintering.

[0145] Inventive example 2 uses 20% by mass of ultra-fine limestone powder relative to the total limestone combination. Inventive example 3 uses 20% by mass of ultrafine limestone powder relative to the total limestone combination, and at the same time uses high carbon relative to the total coke combination. 20% by mass of dust. It should be noted that the external loading time is 40 seconds for limestone powder and 20 seconds for coke powder.

[0146] The results of studying the sintering time, yield, and productivity when sintering each raw material for sintering thus obtained are compared and shown in Picture 9 .

[0147] [table 3]

[0148] Mixing ratio (mass%)

[0149] Such as Picture 9 As shown, compared with Com...

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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 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 forming a limestone-based powder starting material inner 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 outer layer by supplying a solid-fuel-based powder starting material on the limestone-based powder starting material inner layer, 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] The present invention relates to a method for producing raw materials for sintering, which uses a pan-type granulator to granulate and then uses a downward suction type DL-type sintering machine (Dwight-Lloyd sintering machine) to produce sintered ore for a blast furnace. Background technique [0002] Sintered ore used as a raw material for a blast furnace is generally produced through the following sintering raw material processing method. [0003] That is, first, iron ore with a particle size of 10 mm or less, and SiO-containing slag composed of silica, serpentinite, or nickel slag 2 Raw materials, limestone and other limestone-based raw material powders containing CaO, and solid fuel-based raw material powders such as powdered coke or anthracite as a heat source are mixed with an appropriate amount of water and granulated to form what are called quasi-particles. Pellets. The compounding raw material composed of the quasi-particles is loaded into a DL-type...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16
CPCC22B1/20C22B1/2406C22B1/245Y02P10/20
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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