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Method of granulating sintering material for iron manufacturing

A processing method and raw material technology, applied in the direction of special binder granulation, etc., can solve the problems of decreased air permeability of sintering machine and decreased productivity of sintering process, etc.

Inactive Publication Date: 2005-09-28
NIPPON STEEL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of granulating raw materials for ironmaking with dust or returned ore in this technology, there is still room for research to improve pseudo-granulation properties
That is, when sintering raw materials containing dust or returned ore are used in the sintering process, the dust is mainly composed of, for example, particles, and the dust contains components such as quicklime that adversely affect the above-mentioned dispersant, so the air permeability in the sintering machine decreases, and further sintering Productivity drop in process
Therefore, in this case, there is still room for research in fully reducing the adverse effects of dust, making the raw materials for ironmaking and dust sufficiently pseudo-granulated, and improving the productivity of sintered ore.

Method used

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  • Method of granulating sintering material for iron manufacturing
  • Method of granulating sintering material for iron manufacturing
  • Method of granulating sintering material for iron manufacturing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0243] Charge 805.5 parts of ion-exchanged water and 40.1 parts of 45% sodium hypophosphite monohydrate aqueous solution as a chain transfer agent into a 5L separable flask (made by SUS316) equipped with a stirrer and a condenser. The temperature is raised to the system under stirring. Boiling point (100°C). Next, into the above-mentioned separable flask, 2126.1 parts of 80% acrylic acid aqueous solution as a carboxyl group-containing monomer, 112.4 parts of 15% sodium persulfate aqueous solution and 160.2 parts of 45% sodium hypophosphite as a polymerization initiator were added dropwise. Aqueous hydrate solution. The above-mentioned 80% acrylic acid aqueous solution, 15% sodium persulfate aqueous solution, and 45% sodium hypophosphite monohydrate aqueous solution were dropped from their respective drip openings. The 80% acrylic acid aqueous solution was added dropwise for 180 minutes. The 15% sodium persulfate aqueous solution was added dropwise for 185 minutes. The 45% sodium h...

Embodiment 2

[0250]The polymer aqueous solution (A) obtained in Example 1 was taken so that the solid content conversion amount was 70 parts, and it was diluted to 2460 parts with ion-exchanged water. Next, the polymer aqueous solution was stirred at a speed of 2000 rpm using a homomixer, and 2800 parts of "Alfa coat" (produced by ECC international incorporated) as fine particles (adhesive for granulation) were mixed into the polymer aqueous solution in about 30 minutes. The average particle size of kaolin is 2.7 μm), and the mixture is further maintained at a speed of 3000 rpm for 5 minutes to obtain the slurry (2) of the granulation treatment agent for ironmaking of the present invention. The viscosity of the slurry (2) is 4400×10 -3 Pa·s(4400cP).

[0251] Thereafter, the slurry (1) in Example 1 was replaced with the above slurry (2), and the same granulation operation as in Example 1 was performed to measure the moisture content of the obtained pseudo particles. At the same time, the pseudo...

Embodiment 3

[0253] A 5 L-capacity separable flask (made by SUS316) equipped with a stirrer and a condenser was charged with 805.5 parts of ion-exchange water, and the temperature was raised to the boiling point (100°C) of the system. Next, 2126.1 parts of 80% acrylic acid aqueous solution as a carboxyl group-containing monomer, 112.4 parts of 15% sodium persulfate aqueous solution as a polymerization initiator, and 88.5 parts of 45% hypophosphorous acid as a chain transfer agent were added dropwise to the above-mentioned separate flask Sodium monohydrate aqueous solution. The above-mentioned 80% acrylic acid aqueous solution, 15% sodium persulfate aqueous solution, and 45% sodium hypophosphite monohydrate aqueous solution were dropped from their respective drip openings. The 80% acrylic acid aqueous solution was added dropwise for 180 minutes. The 15% sodium persulfate aqueous solution was added dropwise for 185 minutes. The 45% sodium hypophosphite monohydrate aqueous solution was added drop...

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Abstract

A method of granulating a sintering material for iron manufacturing which contains a powdery iron ore, the method comprising a step which comprises diluting fine particles having an average particle diameter of 200 m or smaller beforehand with a solvent or part of the sintering material, adding the resultant mixture to the remaining sintering material, and granulating this mixture, the step being at least one step selected from the group consisting of the following (1), (2), and (3). A step which comprises diluting the fine particles with water so as to result in a slurry having a viscosity of 0.005 to 10 Pa.s, adding the slurry to a sintering material, and granulating the mixture. A step which comprises granulating beforehand the fine particles together with 13 to 60 wt.%, on a dry basis, of a sintering material containing iron ore as an essential component, adding the granules to the remaining sintering material, and granulating the mixture. A step which comprises mixing beforehand the fine particles with 0.3 to 10 wt.% of the sintering material on a dry basis, adding the mixture to the remaining sintering material, and granulating the mixture.

Description

Technical field [0001] The invention relates to a granulation treatment method of sintering raw materials for ironmaking. More specifically, the present invention relates to a method for granulating sintering raw materials such as fine iron ore, which is a raw material charged into a blast furnace in a milling process, during the manufacturing process of sintered ore. Background technique [0002] In the milling process, sintered ore, lump ore, and pellets composed of iron ore are usually charged into a blast furnace together with coke for milling. The sintered ore is processed in advance with sintering raw materials containing iron ore, flux, fuel, etc., and then filled in a sintering machine, filled to a predetermined height to form a sintered bed, and then ignited on the surface to produce the sintered ore by sintering . As a sintering machine, a down-suction sintering machine is usually used. The air is circulated for sintering by sucking in air from below the sintering raw m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/14C22B1/24C22B1/243
CPCC22B1/14C22B1/243C22B1/24C22B1/16B01J2/28
Inventor 冈田务佐藤武彦品川和之细谷阳三河野克之中元桂一三浦悟
Owner NIPPON STEEL CORP
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