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Method for removing ladle dross

A technology for ladle and scum, applied in the field of metallurgy, can solve the problems of difficulty in removal, secondary oxidation, high labor intensity, etc., and achieve the effect of strengthening the slag cleaning effect, avoiding secondary oxidation, and overcoming large steel loss.

Active Publication Date: 2007-10-03
YANTAI SHENGLIDA ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(3) When removing slag, due to the stirring action of the slag rake, the molten steel is secondary oxidized, which in turn affects the quality of the molten steel
(4), the labor intensity is high, and the slag removal time is long
(5) Since the slag is often in a liquid state in a high temperature environment, it must be difficult to remove

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The slag floating on the liquid surface of the steel ladle is fished out by the slag rake rotary slag removal method, and the anti-oxidation protective agent is evenly added to the clean molten steel surface on which the slag rake walks while removing the slag.

[0018] The dosage of the anti-oxidation protective agent is 2-3 kg / ton of steel.

Embodiment 2

[0020] Firstly, the slag freezing agent is added into the ladle to solidify the liquid slag floating on the surface of the molten steel. The amount of freezing slag agent added is 0.5-5.0 kg / ton of steel depending on the amount of slag.

[0021] After 1-2 minutes, use the slag rake to remove the slag floating on the liquid surface of the ladle. While removing the slag, add the anti-oxidation protective agent evenly on the clean molten steel surface that the slag rake walks on. The amount of anti-oxidation protective agent is 2-3 kg / ton of steel.

[0022] Preparation Example 1 of Antioxidant Protective Agent

[0023] Calcium Oxide 50%, Aluminum Oxide 40%, Calcium Fluoride 10%. The above components are mixed in proportion and stirred evenly to make a powdery or granular mixture. Said percentages are percentages by weight, the same below.

preparation example 2

[0025] Calcium Oxide 60%, Aluminum Oxide 37%, Calcium Fluoride 3%. The above components are mixed in proportion and stirred evenly to make a powdery or granular mixture.

[0026] Preparation example three of anti-oxidation protective agent

[0027] Calcium oxide 69%, aluminum oxide 25%, calcium fluoride 6%. The above components are mixed in proportion and stirred evenly to make a powdery or granular mixture.

[0028] Preparation Example 4 of Antioxidant Protective Agent

[0029] Calcium oxide 60%, aluminum oxide 30%, calcium fluoride 5%, barium carbonate 5%. The above components are mixed in proportion and stirred evenly to make a powdery or granular mixture.

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PUM

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Abstract

The invention provides the method of removing liquid steel scum, comprising the following steps: dragging the scum from liquid steel liquid level with harrow rotary dragging method, at the same time, adding the anti-oxidization agent on the clean liquid steel surface. Because of adopting the harrow rotary dragging method, the invention solves the problems of big loss of scarfing cinder, hard operation and heavy labor strength. Adding the anti-oxidization agent avoids the secondary oxidization of liquid steel. The method uses the freezing slag agent to solidify the liquid slag. It strengthens the effect of removing slag.

Description

technical field [0001] The invention relates to a method for removing scum in a ladle and belongs to the technical field of metallurgy. Background technique [0002] At present, the molten steel smelted by steelmaking furnaces such as converters and electric furnaces always has a certain degree of slag on the surface when the steel is tapped. These slags will have adverse effects on the quality of subsequent refining and continuous casting molten steel, mainly reflected in the problem of phosphorus reversion and the introduction of undesired metal or non-metal inclusions. Especially for high-grade steel grades, the impact of this slag is even greater. [0003] Existing slag removal methods are slag removal or slag dumping, and these two methods have the following defects (1), because the existing ladle does not have a slag outlet, the slag removal and slag dumping operations are not easy to carry out. (2), all have relatively a large amount of molten steels to be taken out...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D43/00B22D11/111
Inventor 盛富春
Owner YANTAI SHENGLIDA ENG TECH
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