Method for treating sintering granules

A processing method and granulation technology, which are applied in the field of processing granulated materials for sintering, can solve problems such as cohesion of fine particles, and achieve the effects of inhibiting re-dispersion and inhibiting strength reduction.

Inactive Publication Date: 2012-01-25
NIPPON STEEL & SUMITOMO METAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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Method used

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  • Method for treating sintering granules
  • Method for treating sintering granules
  • Method for treating sintering granules

Examples

Experimental program
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Effect test

Embodiment

[0106] Next, examples performed to confirm the effects of the present invention will be described.

[0107] First, the result of adhering the strength-decreasing inhibitor to the surface layer of the quasi-granulated material produced using the above-mentioned conventional granulation line will be described.

[0108] Using a combination of several types of iron ore powder and sintering raw materials such as carbon materials, lime, and serpentinite (ore powder: 70.5%, lime: 10.0%, serpentine: 1.0%, carbon material: 3.5%, Return ore: 15.0%, the total is 100%), using a drum mixer (granulator), mixing for 4 minutes while adding water to granulate, and adjusting the moisture content of the granulated material to 7% by mass. In this wet granulation, quicklime which functions as a clay-based binder is added. In addition, the moisture content of the granulated material is the ratio of the moisture to the sum of the dry weight and the moisture of the granulated material.

[0109] The...

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Abstract

Disclosed is a method for treating sintering granules, which enables the maintenance of strength of granules even when the granules are exposed to excess moisture in a wet zone or when dry granules are mixed with wet granules and the dry granules reabsorb moisture, and which can achieve a continuous granulation treatment in a continuous treatment line. The method comprises supplying coated granules into a sintering machine, wherein the coated granules comprise: granule which are produced by subjecting a raw material containing an accessory raw material comprising a iron ore powder, a carbon material and caustic lime to a wet granulation procedure using a binder to produce granules; and at least one strength reduction-preventing agent selected from a coagulant, a hydrophobizing agent and a water repellent agent, which is adhered on the surfaces of the granules.

Description

technical field [0001] The present invention relates to a method for treating granulated materials for sintering used as raw materials for blast furnaces. Background technique [0002] Sintered ore, which is a raw material for a blast furnace, is obtained by adding water to iron ore, fuel, auxiliary raw materials, etc., using a granulator, mixing and granulating them, and firing them in a sintering machine. In order to maintain and improve the productivity of the sintered ore, it is important to ensure the air permeability in the sintered raw material being fired in the sintering machine, and granulation becomes an indispensable operation. [0003] However, the water used for granulation evaporates during the firing process, forming a so-called wet zone that condenses in the lower unfired granules (granules; granules), and the granules in this excess water The collapse of the material causes the problem of hindering the ventilation in the sintering machine. In addition, in...

Claims

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Application Information

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IPC IPC(8): C22B1/16
CPCC22B1/244C22B1/2413C22B1/20C22B1/2406C22B1/16
Inventor 八代健一长田淳治
Owner NIPPON STEEL & SUMITOMO METAL CORP
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