Aluminum Calcium Top Slag

Details:

Product performance of Aluminum-calcium Top Slag

1. Molten steel deoxidation prevents secondary oxidation, and a high deoxidation rate, changes molten steel concentration.
2. Adjust the slag, reduce the steel slag, purify the molten steel, and improve the purity of the molten steel.
3. Reduce alloy consumption and effectively improve alloy recovery rate.
4. Effectively adjust the slag layer performance and the basicity of steelmaking slag to make inclusions from molten steel.

Application of Aluminum-calcium Top Slag in Steelmaking

During the steelmaking process, the oxidizing property of the ladle top slag directly affects the total oxygen content of the molten steel in the tundish, thereby affecting the cleanliness of the molten steel. The oxidizing property of the slag is closely related to the quality of the steel. If you want to reduce the T.[O] content of the molten steel in the tundish, you must reduce the oxidizing property of the ladle top slag when the RH leaves the station.

The aluminum-calcium top slag is a new composite material that combines two super-deoxidizing elements, aluminum, and calcium into one. Both calcium and aluminum have a strong affinity with oxygen. Calcium, in particular, used as a strong reducing agent is a very active metal that has a strong affinity not only with oxygen but also with sulfur and nitrogen. Aluminum was used as a traditional deoxidizer for steelmaking, due to the strong affinity between Al and O and the complete mutual solubility between Al and Fe. This also determines that the status of Al as an essential component in steelmaking deoxidation will be difficult to change for a long time.

Studies have shown that adding Ca, a strong deoxidizing element, to Al-containing modifiers can effectively denature the high-melting-point inclusions produced by deoxidation, thereby significantly improving the fluidity of molten steel. Therefore, an aluminum calcium top slag modifier is an ideal product. Aluminum-calcium top slag not only has a strong deoxidation ability, making the deoxidized products easy to float and discharge but also can improve steel performance and enhance steel’s plasticity and toughness.

The use of aluminum calcium can quickly form slag so the converter can form high-alkalinity slag early. This is because it contains highly chemically active calcium. Calcium (Ca), as a second main group element, is highly reactive and has a strong deoxidation ability. Its main uses in the steel industry are desulfurization and deoxidation, increasing the fluidity of molten steel, and promoting the rapid floating of inclusions in molten steel. During the converter blowing process, when splashing is about to occur due to various reasons, adding a modifier into the furnace can quickly reduce the iron oxide in the slag due to the action of active calcium. Therefore, the intense carbon-oxygen reaction can be quickly suppressed to avoid splashing or stop splashing.

Secondly, when calcining sulfur-containing substances, sulfur reacts with oxygen in the air to generate sulfur dioxide. Sulfur dioxide is an acidic oxide, and calcium oxide is an alkaline oxide. They are particularly easy to react at high temperatures to generate relatively stable calcium sulfate. The principle of calcium oxide desulfurization is a neutralization reaction process. It absorbs sulfur dioxide generated by sulfur combustion through its reaction with SO2 (CaO SO2=CaSO3), so that its reaction is converted into a stable desulfurization byproduct, thereby achieving the purpose of desulfurization.