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Purging Plug Classification (I-II)
Source： Kechang
Release time：2018-12-22 10:13
This chapter discuss about the classification based on the structure of purging plug. Luoyang Kechuang New Materials, focusing on the product development of purging plug, it is a plant develop, producing and selling the purging plugs.
Classification I - Based on application.
Depending on its application, purging plug can be classified into ladle purging plug, rotary electric furnace purging plug, intermediate frequency furnace purging plug, aluminium metallurgy purging plug and rotary refining furnace.
1.Ladle furnace is seated at bottom of ladle, it is by a blowing of argon or nitrogen towards to the bottom which cause the metal liquid steel stirring. By this way, it gets rid of the dissolved gas in the liquid steel, meanwhile it distributes the liquid evenly. When supplying the liquid to the continuous casting machine, such evenly stirred liquid can be adjusted to the temperature to allow for the casting under the constant condition.
2.Rotary Electric Furnace (EAF) Purging Plug is seating at the bottom of the EAF, by blowing argon towards to the bottom of the electric furnace, it decreases the composition of ferric oxide in the residue of rotary furnace. Therefore, it improves the steel metal acquisition efficiency, and reduces the ferro alloy consumption in the production. It also distribute the composition in the liquid steel and dissipated the heat uniformly.
3.Intermediate frequency furnace purging plug, it is reduces the cost, lower all residues generated from intermediate process during smelting. Therefore, it increases the metallurgy grades and improve the economic efficiency. Purging plug can let the liquid steel degas, decarburization and get rid of oxide materials. Most importantly, by supplying argon gases into the molten chromium steel, chromium composition will not change during the decarburization stages.
4.Aluminium metallurgy purging plug has been widely applied in aluminum metallurgy. It can be applied into launder, degas filtration box, transfer aluminum liquid, holding furnace and melting furnace. The advantage of this application is that it greatly improve thermal circulation, which allows for distribution of temperature more evenly. In this process, the dissolution of gas into the aluminum liquid more rapidly, it also reduce the separation of aluminum slag.
5.Rotary refining furnace, it is becoming widely applied. This rotary refining process adopt a blowing from bottom of furnace, it efficiently reduce the single smelting time, proving to have high thermal efficiency. It also process the cold feeding in a great amount which provide thermal diffusing evenly within the furnace. Therefore, it improve the anode quality, and improve the anode copper composition to more pure and quite elevated in the quality.
Figure 1: Front and back view of the dispersed Purging Plugs
Classification II- Based on brick structure
1.Impermeable type purging plug is a type relying less on sweeping, its permeable rate is high. The high temperature imposes the microporous structure within the structure. During the formation of micro-sphere, close-pores forms after high temperature treatment, those microsphere form into the interconnected pores. Therefore, using this type of purging plug achieves the liquid steel purification purpose. On top of that, it avoid the liquid steel permeating into the bricks.
2.Slit-type purging plug is the most widely applied products in the market. By the real application situation, the slit number and length will be varied by designing. Therefore, the application in certain liquid steel purification could be improved by enhancing air permeability, liquid filtration as well as the temperature conductivity.
3.Hole-traverse Conductive Purging Plug is one that mainly applied in the rotary EAF. As the ladle usually apply the quite complex structure of hole-traverse materials. Therefore, comparing to slit-type purging plug, this type has lower air permeability. On top of that, slit-type purging plug replace the hole-traverse purging plug.
Figure 2: Slit-type Purging Plug, Classification of the products according to Structure
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