What are the Advantages of the Molten Oxygen Combined Operation Method?

What are the  Advantages of the Molten Oxygen Combined Operation Method?

(1) The molten oxygen combined operation is by no means a simple "low temperature stripping" oxidation. The key point of the process is to create an oxidizing slag with a relatively large slag volume and appropriate alkalinity in advance in the late stage of melting. The key to the process is to use the favorable thermodynamic conditions of low temperature dephosphorization to create good stirring dynamic conditions for the molten pool to achieve the purpose of early dephosphorization.

So, if the amount of decarburization after full melting is not clearly specified during the molten oxygen period, will it affect the quality of steel (referring to the gas content in the steel)?

It must be pointed out here that the significance of relying entirely on the oxidation period to remove gas and inclusions is for the old process of ore oxidation and melting period, which only heats and melts the solid furnace charge into liquid. Due to the long melting time of the original process, the furnace charge absorbs a large amount of gas during the melting process, so that the hydrogen content in the molten steel reaches a value that is balanced with the partial pressure of water in the furnace gas, making the degassing and de-inclusion conditions of the molten pool poor.

The premise of using molten oxygen combined with oxygen blowing to assist melting and no decarburization is that oxygen blowing to assist melting greatly shortens the melting period, slag is made in advance during the melting period, a large amount of oxygen is used, and the molten pool is stirred by oxygen blowing. This process is accompanied by oxygen blowing to decarburize and degas, which greatly reduces the relative gas content in the molten steel at the end of the melting period, thereby reducing the degassing task during the oxidation period.

Furthermore, although the degree of degassing is related to the length of the decarburization time, it depends to a large extent on the decarburization speed.

Since the speed of oxygen blowing decarburization is 2 to 3 times greater than that of adding ore, the corresponding decarburization amount for removing the same gas can also be greatly reduced.

(2) The operation is simple and easy to master, and it is very popular among operators.

(3) The smelting time is short and the power consumption is reduced. The molten oxygen combined with the oxidation period task is completed in advance at the same time as the melting period, which improves the utilization rate of the thermal effect, accelerates the reaction, and makes the whole furnace smelting orderly. The corresponding thermal shutdown time is short, and the steelmaking cycle is compressed. Generally, the smelting time of a single furnace can be shortened by about 15 minutes.