Process Flow and Basic Process Parameters of Magnesium Desulfurization by Iron Water Bag Blowing Particles
Magnesium desulfurization (MgO desulfurization) is a widely used desulfurization method. The magnesium oxide desulfurization process mainly uses magnesium oxide as a desulfurizer and uses an iron water bag as a carrier. The particle-shaped agent is used as a medium to carry the desulfurizer into the melting bath desulfurization. Compared with the traditional desulfurization method, the desulfurization efficiency is significantly higher, the reaction time is faster, and the desulfurization effect is more remarkable.
1. Overall process flow of iron water bag desulfurization
Overall, the process flow standard of iron water bag desulfurization is: iron water bag→firing of iron water bag→de-insulating water bag→water bag closed→iron water bag blowing desulfurization.
2. Basic parameters of iron water bag desulfurization
2.1 Iron water bag and iron water bag playing time
The iron water bag is a container for storing magnesium oxide desulfurizer. Generally, iron water bags with a diameter of about 400mm and a length of about 500mm will be used. The iron water bag shall be of sufficient thickness and hardness to prevent the flying desulfurizer particles from piercing the water bag. The iron water bag playing time should not be too long, generally playing time is 120 seconds to 180 seconds, the iron water bag Burning temperature is generally 1150 ℃ ~ 1200 ℃.
2.2 Desulfurization temperature
In the process of iron water bag desulfurization, the desulfurization temperature of molten iron before desulfurization is generally controlled in the range of 1550-1600℃, which is recommended as 1600℃. The desulfurization temperature of molten iron after desulfurization should not exceed 1500℃.
2.3 Desulfurization time
The time required for the iron water bag desulfurization process should be as short as possible, based on production needs. Generally, if the desulfurization temperature before desulfurization is 1600℃, the desulfurization time after desulfurization should be controlled at 20~30 minutes.
2.4 Desulfurization dosage
Because the magnesium oxide desulfurizer particles are placed in an iron water bag and then added to the molten iron for desulfurization, the quantity of the desulfurizer per water bag, the unit weight of the magnesium oxide desulfurizer, The particle size also affects the desulfurizer dosage added to the molten iron. The desulfurizer amount added per iron water bag is generally 4%~6% of the melt weight.
2.5 Iron and steel smelting routine
In the iron and steel smelting process, the iron and steel smelting routine and the iron water bag desulfurization process should be reasonably arranged and synchronized to ensure the normal operation of desulfurization. The order of smelting process should be: first, before desulfurization, start smelting, adjust temperature, equalize molten iron, then start desulfurization, and complete desulfurization after a period of time Re-smelting-cast.
3. Conclusion
Due to the remarkable desulfurization effect, short reaction time and reasonable price of the magnesium oxide desulfurizer, the iron water bag desulfurization method has been widely used in the steel industry. This article describes the process flow and basic process parameters of iron water bag desulfurization in detail. If used correctly, it can improve the desulfurization rate, production efficiency and economic benefits of steelmaking.
