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Method of processing slag

A treatment method and slag technology, applied in the direction of treatment of discharged materials, improvement of process efficiency, furnace, etc., can solve problems such as inability to perform temperature management, equipment cost, high treatment cost, and poor workability

Inactive Publication Date: 2013-01-09
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] However, in the autoclave method disclosed in Patent Document 1, although the process can be completed in a short time, since high-pressure steam is used, energy is required for steam production, and there is a problem of cost.
[0011] On the other hand, in the method of Patent Document 2, since watering and aging are performed in a single airtight container, it is almost impossible to control the temperature, and aging using the generated steam cannot be performed at an optimum temperature.
In addition, since the inside of the container is under high pressure, it is necessary to use a pressure-resistant container, so there is a problem that the workability is poor, and the equipment cost and processing cost are also increased.
[0012] In addition, the method of Patent Document 3 is to spray water or add water vapor when the temperature of the steelmaking slag is 550°C to 100°C, so that the temperature of the slag decreases due to watering, and the temperature of the slag can be maintained at an appropriate aging condition of 500°C to 200°C The aging time is short, and the aging effect cannot be fully exerted

Method used

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  • Method of processing slag
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  • Method of processing slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0154] [Example of the present invention]

[0155] (i) Cooling treatment process

example 1

[0157] Alkalinity [mass ratio: %CaO / %SiO 2 ] is 3.8 molten slag (15t) is transported to the slag treatment field by slag pot, puts into this field. After several hours, the whole amount of slag that has been solidified on the surface by standing and cooling is transported with a bucket, and loaded into such as image 3 A cylindrical processing vessel D is shown. At this time, the surface temperature of the slag is 1000-700°C.

[0158] (b) Example 2 of the present invention

[0159] use relative to Figure 6 The cooling treatment unit shown is equipped with such Figure 12 The cooling treatment device M of the stretching roll 40 shown is to decarburize and refine the basicity [mass ratio: %CaO / %SiO 2 ] was 3.8 The molten slag (15t) was transported to the cooling treatment device M through the slag pot, and the cooling treatment was carried out by this device. The specifications and operating conditions of this cooling treatment device M are as follows.

[0160] Cooling d...

Embodiment 2

[0181] ○ Embodiment 2 (example 3 of the present invention)

[0182] With the same molten slag processed in the example 2 of the present invention, use such as Figure 13 The devices shown were processed. First, the molten slag is cooled using a cooling treatment device M equipped with cooling drums 10a, 10b, solidified into a plate shape with a thickness of about 5mm, and then filled into a cylindrical cylindrical container D to implement the method of the present invention (steps A, B). At this time, a part of the cooling water passed through the cooling drums 10a and 10b is used for sprinkling the inside of the tubular cylindrical container D. As shown in FIG.

[0183] In order to generate steam, the amount of water sprayed on the slag in the cylindrical processing container D is about 200 kg / t-slag (= steam generation amount) at about 30°C. The 70°C cooling water of the cooling drums 10a, 10b of M is used for sprinkling, so the steam generation is 210kg / t-slag, an increa...

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Abstract

Disclosed is a method for aging steel slag or the like efficiently in a short time at a low cost. A method of processing slag comprises a step (A) for spraying water to high-temperature slag such as steel slag, and a step (B) for aging the slag by bringing steam produced by spraying water in step (A) into contact with slag cooled by water spraying, wherein the step (A) and the step (B) employing steam produced in the step (A) are carried out at different places. Since water is sprayed to high-temperature slag and aging of the slag is performed by steam generated by using latent heat of slag, cooling and aging of slag can be carried out efficiently at a low cost, and, since the step for producing steam by spraying water and the step for aging the slag by using the steam are carried out at different places, temperature control of aging is facilitated and steam aging can be carried out under optimal temperature conditions.

Description

technical field [0001] The invention relates to a method for efficiently aging the steel-making slag and ore smelting reduction slag produced in the refining process. Background technique [0002] In the steelmaking process, since lime is used for refining, the generated slag contains CaO. Among them, the alkalinity (CaO / SiO 2 ) part of the CaO contained in the high steelmaking slag exists in the form of free CaO, and when the slag is used as a roadbed material, etc., there is a problem of hydration expansion of free CaO in contact with water. In order to prevent such hydration expansion of free CaO, conventionally, after the steelmaking slag generated in the refining process is temporarily solidified, aging treatment such as steam aging is performed. [0003] The steam aging used to prevent the hydration expansion of free CaO usually involves spraying 100°C steam under normal pressure from the lower layer of slag piled up to a height of about 1-2m, so that the temperature...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B5/00C21B3/06C21B3/08C21C5/28C21C7/00F27D15/00F27D15/02
CPCF27D15/028C04B5/00C21B3/08C21B2400/024C21B2400/052C21B2400/056C21B2400/068C21B2400/08Y02P10/25
Inventor 当房博幸薮田和哉户泽宏一岩崎克博
Owner JFE STEEL CORP