Ideal Composition Design in Compound Deoxidizers

  Deoxidation is a very important part of the steelmaking process, and the effect of deoxidation will directly affect the quality of steel. There are many types of steelmaking deoxidizers, there are single-element deoxidizers, there are also composite deoxidizers. In general, the composite element is much better than the single element deoxidation effect, the final deoxidation when the oxygen content is low, mainly because of the strong ability of multiple elements to form a composite deoxidation product. In the beginning, the element content in the deoxidizer is very high, while the normal interface reaction with oxygen has a large negative value, and the reaction is also very strong. With the extension of time, the elements gradually dissolved into the steel uniformly until, at this time, the deoxidizing elements and oxygen reaction ability are low, if then reduce the oxygen content, can only rely on reducing the activity in the external slag to adjust the effect of the elements deoxidation. It can be said that the deoxidation process is a non-uniform reaction process.

    Compound deoxidizer and dissolved oxygen contact interface is the interface of intense deoxidation. The ideal group of compound deoxidizer Minamata is calcium, aluminum, the interaction between them can make the deoxidation capacity can be greatly improved. In the steelmaking temperature range, the combination of calcium and aluminum deoxidation capacity is stronger. Although the composite deoxidizer's barium and aluminum composition of the composite deoxidizer, also can play a deoxidizing effect, the consumption of barium is much greater than the consumption of calcium. Calcium can improve the ability of aluminum deoxidation, to achieve the same deoxidation effect, can reduce the amount of aluminum dissolved in the steel, consumption. At the same time, aluminum also reduces the consumption of strong deoxidizing element calcium deoxidation and calcium volatilization loss, to avoid secondary oxidation to produce aluminum trioxide inclusions, blocking the water mouth. Therefore, the composition of the composite deoxidizer is mainly calcium, aluminum elements.