Comparison of four commonly used methods for improving the life of converter purging plug

 Ladle purging plug plays an important role in the refining process of molten steel. As a refractory product, there will be consumption damage during use. Therefore, how to effectively and easily lift the service life of the ladle purging plug is very important.?

In practical applications, there are four main methods:

1. Method of bottom blowing asymmetric gas supply
In the bottom blowing asymmetric gas supply method, the two sets of ladle purging plug are close to alternate work in production, and the size of ladle purging plug is increased, so that the single capillary eroded areas do not overlap, and the use and maintenance of ladle purging plug are adjusted to a good state. Both sets of ladle purging plug can fully play their role, and it is expected that the re-blowing furnace can be nearly doubled. The design of a large-flow ladle purging plug required for asymmetric gas supply has been technically solved. The added cost is small compared to the economic benefits achieved by increasing the metallurgical effect and extending the age of the re-blowing furnace. It is easy to operate and easy to grasp.

2. Method of pre-burying permeable bricks
In order to improve the re-blowing rate, steel used the method of pre-buried permeable bricks. When the permeable bricks were damaged to 600mm (the furnace age was 3000-3500 furnaces), the pre-buried permeable bricks began to work. The pre-buried permeable brick and the original brick are supplied with gas at the same time until the working layer of the bottom of the furnace is thinned to 250-300 mm and the furnace is finished. The furnace age can reach 4500-5500 furnace.
This method can make the blown air supply in the later stage of the furnace to maintain normal, has a stable metallurgical effect, and can extend the age of the re-blowing furnace, but the pre-buried brick can only function after the bottom of the furnace is damaged by 600mm. The effective working length of ladle purging plug is only about 400mm, which is equivalent to 43% of the effective working length of the normal ventilating brick, and its role in extending the furnace age is limited.

3. Method of replacing the permeable bricks
Iron and Steel Co., Ltd. adopts the method of replacing the ventilated bricks with the bottom of the furnace. After the furnace reaches 100 furnaces, 2-4 ventilating bricks are drilled in the predetermined position at the bottom of the furnace. The maximum air supply per permeable brick is 10m3/min. Each time you change 2, the ventilated brick can be used for 1000-1500 furnaces, and each furnace is replaced 2-3 times. The bottom blowing gas supply strength is 0.05% - 0.11%, and the carbon oxygen product is 0.0024.

The method of steelmaking in Iron and Steel Co., Ltd. can make the gas ladle purging plug at the bottom of the furnace have good gas permeability and maintain good metallurgical effect. The re-blowing life of 5000 furnaces is basically synchronized with the furnace age. The disadvantage is that each replacement of a breathable brick for 4h increases the inconvenience to tissue production. As the number of smelting furnaces in the furnace increases, the effective working length of the ventilated bricks that are thinned and replaced at the bottom of the furnace becomes shorter, increasing the frequency of replacement and the consumption of permeable bricks. Drilling method the safety of replacing the permeable brick is lower than that of the bottom laying method.

4. Control reasonable blowing parameters and maintenance
No. 3 Steel has carefully controlled the blowing parameters and carefully maintained it, so that the age of the re-blowing furnace reaches about 4500-5000 furnaces, which can also maintain good metallurgical effect and promote the large-scale converter re-blowing technology.

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality ladle magnesia carbon bricks are good sold to many countries say South Africa, Bangladesh, Indonesia, Malaysia, etc. Shall any interests, welcome to contact us. Our team would make best to be your reliable partner!

Article Source:Comparison of four commonly used methods for improving the life of converter purging plug
Company name: Henan Changxing Refractory Materials Co.,Ltd
More refractory products:https://www.cxrefractories.com/en-product-solution
Email:info@cxrefractories.com
Website:https://www.cxrefractories.com