Method of granulation treatment of raw material for iron making and granulation treatment agent for iron making

A treatment method and treatment agent technology, applied in the direction of improving process efficiency, etc., can solve the problems of reduced strength, deterioration of granulation properties of sintered raw materials, and inability to improve simulated granulation performance.

Inactive Publication Date: 2003-11-19
NIPPON STEEL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, there is a problem that these substances do not have sufficient simulated granulation when producing sintered ore
Also, even if quicklime is added at 2% by weight or more, there is a tendency that the effect of the simulated granulation performance cannot be improved any more.
[0012] The recent problem is that the quality of fine ore has been depleted and the quality of fine ore has been depleted, and the granulatio

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0425] Example 1

[0426] A sintering raw material (raw material for iron making) having the composition shown in Table 1 was prepared.

[0427] Sintering raw material composition

[0428]Add 1400 parts of heavy calcium carbonate with an average particle size of 2μm as fine particles to 70,000 parts of the above-mentioned sintering raw material, put it into a drum mixer, and pre-stir it for 1 minute at a rotation speed of 24 / min to obtain a granulation treatment containing the above-mentioned sintering raw material Used composition. Then, while stirring the composition at the same speed, using a sprayer, spray (add) sodium polyacrylate with a weight average molecular weight of 6000 as a dispersant to the composition (raw material for sintering) as a dispersant in advance of 0.4% 5250 parts of aqueous solution for about 1.5 minutes. The ratio of sodium polyacrylate to the sintering raw material was 0.03%. After spraying, the above-mentioned composition (final composition ...

Example Embodiment

[0430] Example 2

[0431] The granulation treatment was performed in the same manner as in Example 1, except that instead of the heavy calcium carbonate having an average particle diameter of 2 μm in Example 1, 1400 parts of light calcium carbonate having an average particle diameter of 0.15 μm was used as fine particles. The mixing conditions of the particles and dispersants used are shown in Table 2.

[0432] While measuring the moisture contained in the obtained simulated particles, as in Example 1, the simulated particles were classified using a sieve to obtain the average particle diameter and GI index of the simulated particles. The amount of dispersed particles was also determined by the above-mentioned dispersibility experiment. These results are summarized in Table 3.

Example Embodiment

[0433] Example 3

[0434] Instead of the heavy calcium carbonate having an average particle diameter of 2 μm in Example 1, 1400 parts of heavy calcium carbonate having an average particle diameter of 20 μm was used as fine particles. The same operation as in Example 1 was carried out for granulation treatment. The mixing conditions of the particles and dispersants used are shown in Table 2.

[0435] While measuring the moisture contained in the obtained simulated particles, as in Example 1, the simulated particles were classified using a sieve to obtain the average particle diameter and GI index of the simulated particles. The amount of dispersed particles was also determined by the above-mentioned dispersibility experiment. These results are summarized in Table 3.

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Abstract

A method for the granulation treatment of raw materials for iron making, characterized in that a composition for the granulation treatment comprising raw materials for iron making (sintering materials or pelletizing materials) is subjected to a granulation treatment (quasi-granulation or pelletization) by the use of a composition compounded in a manner such that when the composition is dispersed in water at a predetermined proportion, the amount of fine particles floating in water after a predetermined period of time elapsed is 2 wt % or more relative to the solids of the composition used. The method can be suitably used for subjecting raw materials for iron making to a granulation treatment at a low cost, to thereby produce a quasi-granulated or pelletized composition of raw materials.

Description

field of invention [0001] The present invention relates to a method for producing sintered ore as a raw material for iron-making or a method for producing pellets, and in particular, relates to a method for granulating the raw material for iron-making by adjusting the water content of the raw material for iron-making. The granulation treatment method and the granulation treatment agent for iron-making are suitable for simulating granulation or granulation of iron-making raw materials. Background technique [0002] When producing sintered ore, firstly, iron ore, auxiliary raw materials, fuel, etc., which are raw materials for sintering, are mixed, and the water content is adjusted with a granulator such as a roller mixer, a granulator, and an Erlich mixer. Granulation, making simulated particles. The so-called simulated particles are generally particles with particles below 0.5mm attached to 1-3mm core particles. At this time, the role of gran...

Claims

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Application Information

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IPC IPC(8): C22B1/24C22B1/242C22B1/244C22B7/02
CPCC22B1/2406C22B1/244C22B7/02C22B1/242Y02P10/20C22B1/16
Inventor 冈田务细谷阳三冈崎润品川和之铃木治久河野克之本山厚司中元桂一三浦悟
Owner NIPPON STEEL CORP
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