Abstract
AbstractAn experimental test is carried out on the 70t converter in Masteel to study the law of middle period dephosphorization in the smelting period. It is found that the dephosphorization rate is slow in the early and middle period of smelting and the content of the final P in steel cannot reach the standard due to the low oxidation of slag. The content of the final P in steel can be controlled within 0.02% by adding ore to the molten bath in the middle period and raising the lance position. The experimental test shows that the dephosphorization can still be achieved by a large margin if appropriate slag conditions are maintained in the middle period when the C and O reactions are strong. By theoretical calculation, it is concluded that the slag content should be controlled between 15 and 23%, and the basicity of slag should be between 2.5 and 2.8 in the middle period of production. Through the observation of experimental slag by SEM, it is found that the limiting factor of dephosphorization in the middle period under the test conditions is that the dephosphorization speed is too slow due to the low oxidation, rather than the solidification of phosphorus.
Highlights
Phosphorus is a harmful element for most types of steel
To achieve large-scale dephosphorization, it is necessary to achieve dephosphorization throughout the smelting process; especially further dephosphorization is required in the middle of the smelting, when the reaction of C and O is strong
Zhuo [15] discovered through experiments that the phosphorus distribution ratio and dephosphorization ability in the early and middle periods of smelting are relatively low; the rate of dephosphorization reached the highest in the later period
Summary
Phosphorus is a harmful element for most types of steel. When the phosphorus content in steel is high, the elasticity. Compress the smelting time for each heat of steel to achieve single tapping, the slag tapping time in the early period of smelting is eliminated. On this basis, to achieve large-scale dephosphorization, it is necessary to achieve dephosphorization throughout the smelting process; especially further dephosphorization is required in the middle of the smelting, when the reaction of C and O is strong. Further study the law of dephosphorization in the middle period of smelting, to provide a better guide on the dephosphorization process in the production process, and to ensure that the phosphorus content of the steel obtained from single tapping will meet the requirements. Excellent dephosphorization effect was achieved, and the process of production for fast and large-scale production was developed
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