Slag foaming killing material, and slag foaming killing method

A slag foaming and sedation technology, which is applied in steel manufacturing process, manufacturing converters, climate sustainability, etc., can solve the problems of deterioration of operating environment, increase of refining cost, increase of blowing volume, etc., and achieve high sedation effect , maintaining productivity, suppressing foaming effect

Active Publication Date: 2011-04-13
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0023] Adding a large amount of these calming materials to the slag leads to the following problems: 1) an increase in refining cost, 2) an increase in the amount of residues of the calming mate

Method used

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  • Slag foaming killing material, and slag foaming killing method
  • Slag foaming killing material, and slag foaming killing method
  • Slag foaming killing material, and slag foaming killing method

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0061] figure 1 It is a graph showing the relationship between the diameter of bubbles in the molten slag and the lifetime of the bubbles, the horizontal axis represents the diameter of the bubbles, and the vertical axis represents the lifetime of the bubbles. also, figure 2 It is an explanatory drawing of the slag foaming calming method of this embodiment.

[0062] The slag foaming calming material (hereinafter also simply referred to as calming material) of this embodiment is a calming material containing a mixture of carbon powder and water in a container made of a water-impermeable combustible substance. This will be described in detail below.

[0063] The carbon powder has the effect of not sticking to the molten slag on its surface due to its poor wettability with the molten slag. Therefore, if the carbon powder enters the slag liquid film between the air bubbles and the air bubbles, the slag liquid film is removed, so that the bubbles merge . Here, refer to figure...

Embodiment 1

[0109] Examples 1 to 12 all use a mixture of 30% to 60% by mass of water and 20% to 40% by mass of carbon powder with a particle size of 0.2 to 2 mm in a container made of a water-impermeable combustible substance. Calming materials (Materials A~L). As a result, by throwing in 120 kg of this calming material, the foaming could be calmed, and molten slag of 10 tons (target value) or more could be discharged. Especially in Example 1, when discharging molten slag with a basicity of 1.1, 40 kg of calming material (material A) was placed in the slag removal pot before the start of slag removal, and then melted 30 seconds after the start of slag removal. 80kg of sedation material (material A) was added to the slag removal position. As a result, the sedation effect was improved, and 14 tons of molten slag could be discharged. In addition, the same result was obtained also about Example 2 which injected 40 kg of damping material (material B) within 30 seconds from the start of deslag...

Embodiment 5

[0112] Example 5 uses a calming material (material E) with a mass of the mixture packed in a vinyl bag of 0.8 kg (less than 1 kg). Therefore, compared with Example 2, penetration into the molten slag is insufficient, and the discharge of the molten slag is insufficient. The volume is 11 tons.

[0113] On the other hand, Example 6 used a calming material (material F) in which the mass of the mixture packed in a plastic bottle was 12 kg (more than 10 kg). Therefore, penetration into the molten slag was sufficient, and 14 tons of molten slag could be discharged in the same manner as in Example 2. However, the mass of the calming material is too heavy, so the workability of manufacturing and transportation is inferior to that of Example 2.

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Abstract

Disclosed is a slag foaming killing material which comprises: a mixture comprising 20 to 40 mass% (inclusive) of a carbon powder having a grain size of 0.2 to 2 mm (inclusive) and 30 to 60 mass% (inclusive) of water; and a container comprising a moisture-impermeable combustible substance and having the mixture contained therein.

Description

technical field [0001] The present invention relates to a slag foaming sedation material and a slag foaming sedation method for sedating foamed slag. [0002] This application claims priority based on Japanese Patent Application No. 2008-138320 for which it applied in Japan on May 27, 2008, and uses the content here. Background technique [0003] Steelmaking slag (hereinafter simply referred to as slag) generated in the process of producing molten steel may foam (foaming) due to CO bubbles generated at the interface with molten iron or inside the slag itself during or after refining treatment. ) (i.e. volume expansion of slag). When the degree of the foaming is severe, slag may overflow from refining facilities such as converters, molten iron tank cars, and slag removal pots, or from containers for transferring molten iron or slag. Since this slag has a high temperature of 1300 to 1650° C., if it overflows, it will damage the equipment, and the recovery of the equipment re...

Claims

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Application Information

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IPC IPC(8): C21C1/02C21C5/28
CPCC21B3/06C21C2300/04C21C7/0025C21C7/0087C21C2007/0062C21C5/36C21C7/0043C21B2400/02Y02W30/50
Inventor 松泽玲洋新野崇一若生昌光熊仓政宣
Owner NIPPON STEEL CORP
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