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Performance Advantages of Calcium Aluminate Powder in Steelmaking

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Industry News

2021-11-02

Calcium aluminate powder products are widely used in the steelmaking process, and their performance advantages in application are becoming increasingly evident during production and processing. Now, let’s take a look at six outstanding performance benefits of calcium aluminate in the steelmaking process.

Calcium aluminate powder products are widely used in the steelmaking process, and their performance advantages in application are becoming increasingly evident during production and processing. Now, let’s take a look at six outstanding performance advantages of calcium aluminate in the steelmaking process.

Six performance advantages of calcium aluminate powder in steelmaking:

1. Uniform chemical composition, low melting point, and rapid melting rate, which can shorten the refining time;

2. Fluorine-free, does not corrode furnace linings or ladles;

3. Compact structure, non-absorbent, non-chalking, and convenient for storage and transportation;

4. Due to the high hardness and high melting point of calcium aluminate powder, slagging occurs rapidly, which can reduce dust pollution in steel plants and stabilize the refining process.

5. It contains no impurities such as hydrogen, nitrogen, or carbon, which helps improve the quality of steel.

6. Calcium aluminate powder significantly reduces the content of harmful elements and impurities in steel, making it suitable for use with ordinary carbon steel, high-carbon steel, and low- to high-alloy steels.

The appearance of calcium aluminate powder products during the steelmaking process is quite noticeable. Different application methods can fully leverage their respective advantages. Next, let’s talk about the specific steps for applying calcium aluminate powder:

1. When deoxidation is the primary method, the deoxidizer can be directly added to the bottom of the ladle just before tapping. The addition amount is determined by the carbon content of the molten steel at the end point and typically ranges from 4 to 6 kg per 1,000 kg of steel. One-quarter before tapping, conventional amounts of ferromanganese, ferrosilicon, and aluminum are usually added. After tapping, for carbon structural steels, manganese and ferrosilicon are added as usual; no additional alloys or aluminum wire need to be added. The molten steel in the ladle requires only argon bubbling for refining. Using this product for deoxidation can reduce the consumption of carbon-increasing agents (silicon carbide) by 30% to 50%.

2. When desulfurization is the primary objective, 1/3 of the total dosage should be added to the bottom of the ladle in advance, but such addition must be directed toward the area where the steel flow impacts the ladle bottom. As the molten steel flows out, add the remaining 2/3 of the dosage. The dosage—6–8 kg per 1,000 kg of steel—should be determined based on the initial sulfur content of the molten steel and the desired desulfurization effect.

In summary, the methods of adding chemicals—primarily aimed at deoxygenation or desulfurization—vary considerably, clearly demonstrating the effectiveness of calcium aluminate powder.

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