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Method for refining high carbon molten steel by using low aluminum steel casting residue

A casting slag and low-aluminum steel technology, which is applied in the direction of improving process efficiency and recycling materials, etc., to achieve good slagging condition, fast slagging speed and low cost

Inactive Publication Date: 2010-12-29
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has not been used as a material for refining high-carbon steel casting slag

Method used

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  • Method for refining high carbon molten steel by using low aluminum steel casting residue
  • Method for refining high carbon molten steel by using low aluminum steel casting residue
  • Method for refining high carbon molten steel by using low aluminum steel casting residue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for refining high-carbon molten steel with low-aluminum steel casting slag, the steps of which are as follows:

[0027] 1) Preparation of refining slag:

[0028] a) collecting Al≤0.0040% aluminum and steel casting slag with a basicity of 2.0, 2.5, 2.8, 3.2, 4.5;

[0029] b) Crushing the collected Al≤0.0040% aluminum and steel casting slag, with a particle size of ≤5 mm;

[0030] c) Grinding: adding hydrated lime while grinding, the alkalinity of the mixture after adding hydrated lime is 4.5, and the particle size of the grinding is ≤2 mm;

[0031] d) Add water glass water inorganic binder, its addition is Al≤0.0040% 2% of the total amount of aluminum steel casting residue and slaked lime, and stir evenly;

[0032] e) making balls, the diameter of which can be controlled within the range of 5 to 25 millimeters to any size;

[0033] f) Baking, the baking temperature is 80-85°C, the baking time is 175-180 minutes, and the refining slag is ready for use;

[003...

Embodiment 2

[0037] A method for refining high-carbon molten steel with low-aluminum steel casting slag, the steps of which are as follows:

[0038] 1) Preparation of refining slag:

[0039] a) collecting Al≤0.0040% aluminum and steel casting slag with basicity of 2.0, 2.8, 3.2, 3.6, 4.3;

[0040] b) Crushing the collected Al≤0.0040% aluminum and steel casting slag, with a particle size of ≤5 mm;

[0041] c) Grinding: adding slaked lime while grinding, the alkalinity of the mixture after adding slaked lime is 4.8, and the particle size of the grinding is ≤2mm;

[0042] d) adding sodium chloride / magnesium chloride / calcium chloride inorganic binder, the amount of which is 2.5% of the total amount of Al≤0.0040% aluminum steel casting residue and slaked lime, and stirring evenly;

[0043] e) making balls, the diameter of which can be controlled within the range of 5 to 25 millimeters to any size;

[0044] f) Baking, the baking temperature is 95-100°C, the baking time is 150-165 minutes, and...

Embodiment 3

[0048] A method for refining high-carbon molten steel with low-aluminum steel casting slag, the steps of which are as follows:

[0049] 1) Preparation of refining slag:

[0050] a) collecting Al≤0.0040% aluminum and steel casting slag with basicity of 2.2, 2.5, 3.0, 3.8, 4.3;

[0051] b) Crushing the collected aluminum-free steel casting slag, the particle size of which is ≤5 mm;

[0052] c) Grinding: adding slaked lime while grinding, the alkalinity of the mixture after adding slaked lime is 5.0, and the particle size of the grinding is ≤2mm;

[0053] d) adding coal tar organic binder, the amount of which is 3.0% of the total amount of Al≤0.0040% aluminum steel casting residue and slaked lime, and stirring evenly;

[0054] e) making balls, the diameter of which can be controlled within the range of 5 to 25 millimeters to any size;

[0055] f) Baking, the baking temperature is 105-110°C, the baking time is 100-105 minutes, and the refining slag is ready for use;

[0056] 2...

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Abstract

The invention relates to comprehensive utilization of casting residue, in particular to a method for refining high carbon molten steel by using low aluminum steel casting residue with the Al content of less than or equal to 0.0040 percent. The method comprises the following steps of: 1, preparing refinery residue: collecting aluminum steel casting residue with the alkalinity of 2.0 to 4.5 and the Al content of less than or equal to 0.0040 percent; crushing the residue; grinding the residue; adding an inorganic adhesive agent or an organic adhesive agent; pelletizing; and baking residue; 2, adding the refinery residue prepared in step 1 within 30 seconds after the deoxidizing alloying of the molten steel; and 3, controlling the time from pouring to the refining completion within 15 to 30 minutes, and controlling basicity of the residue after the refining completion to be 2.1 to 2.8. The method has the advantageous of realizing the comprehensive cyclic utilization of the low aluminum high carbon steel casting residue, and reducing the environmental pollution and field occupation along with simple and feasible technology, low cost, good slag formation, high slag formation speed, and short slag formation time. Though the refining time is relatively prolonged, the quality of the molten steel is improved.

Description

technical field [0001] The invention relates to the comprehensive utilization of low-aluminum steel (namely Al≤0.0040%) casting slag, in particular to a method for refining high-carbon molten steel with low-aluminum steel casting slag. Background technique [0002] Continuous casting slag refers to the residual steel slag left in the ladle and tundish when the ladle and tundish are replaced during the continuous casting process. In recent years, the output of high-quality high-carbon steel in steel mills has increased significantly, and the ratio of molten steel refining treatment has also increased, resulting in an increasing amount of high-carbon steel slag remaining in the ladle after the completion of molten steel refining treatment. The increase in the amount of high-carbon steel slag makes the treatment more difficult, so new slag yards have to be added to meet the needs of its storage and turnover. This not only causes environmental pollution, uses a large area of ​​...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/076
CPCY02P10/242Y02P10/20
Inventor 陈钢石磊易卫东王国平陶勇刘中桂拥
Owner 武汉钢铁有限公司
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