13
2019
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03
Brief Discussing Methods for Improve Ladle Blowing Rate (I - II)
Source： Kechuang
Release time：2019-03-13 13:57
This articles discuss about the method I to improve the ladle blowing rate.
Figure 3:Luoyang Kechuang New Materials Patented Products GW Series Slit-type Purging Plugs
This articles discuss about the method I to improve the ladle blowing rate.
1. Select the raw materials more strictly
Corundum is the main composition, forming in the main crystals, it also add some agglutinate using some Cr2O3 for the reason as: The refractory oxidize has the chemical stability as Al2O3>CaO>MgO>Cr2O3. Liquid steel to the refractory raw material show the wettability in different contact angle: ZrO2>Al2O3>MgO. Therefore the corundum Ai2O3 is the best main crystal phase raw material. On the other side, adding Cr2O3 to corundum form the strengthened Al2O3-Cr2O3 smelting bonds, which can improve corrosion-resistant property to iron ferric oxide. Meanwhile, a hindered of over growth of crystals within the corundum added Cr2O3 also depends on the amount of Cr2O3.
2. Select the purging plug with a better structure
Hole-traverse type, tends to have some clogging during the argon blowing. While, the early stage of diffusive type structure, has tiny and continuous holes, such high porosity could not ensure a durability upon use.
By designing and developing the slit-type purging plug, the multiple slits around the core of bricks can withstand the multiple filtration over the structure. The slit width is designed as 0.15-0.20 mm, it not only appove fore the gas blowing intensity, but also adjust the flux rate. Therefore, it lower the clogging rate.
As the liquid steel from different steel species varies, some times as stiring with blowing of argon gas, the purging plug need to improve the structure dimensional stability. Some plant need to adopt more slits with a varied slit-gap spaces for their metallurgic purpose.
Ideally, the patent products Luoyang Kechuang Impermeable purging plug has uniqe formula, both design and producing techniques has been developed over the stages of prototyping, validating, modified according to special needs. Advantages of these Kechuang purging plugs are finer pores forming some connectivity within the purging plugs, high porosity, uniform pores within. Meanwhile, it has uniform bubbles for liquid steel to be around the slit. Thanks to the unique formula, this product is impermeable for liquid steel, and has high blowing rate and longer period of life.
3. Improve the construction techniques
With the single piece installation upgrading, two pieces of such products are installed. As the utilization of out of furnace refining process improvement, especially LF furnace ladle refining, and VD new process of vacuum treatment, the steel makers has brought higher requirement for the bottom purging technique. Therefore, the construction at the ladle need to consider the new techniques and need to provide a coherent upgrade to improve the blowing rate in that applications.
Luoyang Kechuang New Materials is a company focusing on product development, production, sales and market use for 22 years. This company is a professional purging plug manufacturing company.
This articles discuss about the method II to improve the methods to extending the use
1. Utilize one property to its optimum by using in a proper way
Over flux rate may corrode the bottom purging plugs. Adjust gas flux rate in each stage strictly.
How to do this, at the steel tapping, turn on the gas in order to let the cold steel melt in the high temperature liquid steel. Therefore, considering both the high temperature liquid steel and static pressure, only by turning on the gas source can it reduce the amount of clogging from cold steel.
Blow the liquid steel at a high pressure of 1.5-1.8MPa within 3-5 second so that blowing the condensed steel out of the conduct. This also need to occasionally observe the gas tunnel connection. When there is a signal of leaking, should take action immediately.
On-site analyst staff should record the residue purging plug thickness. It acts as the precondition for the safety in the steel smelting.
2. Maintain after installation upon usage
When pouring liquid steel, a lot of permeating happens at this stage. After pouring, the ladle temperature dramatically drops, the bottom blowing purging bricks may corrode into a concave shape. In order to avoid the steel to condense too quickly,, worker should flip the ladle immediately, and control the argon and nitrogen gas to the pressure range of 0.8-1.0 MPa. Sometimes, the surface steel residues must be swept, or by applying pressurized gas to blow the residues of steel particles.
3. Use Luoyang Kechuang impermeable purging plug
Luoyang Kechuang impermeable argon purging plug adopt the micropores filtraed patents. This technology can effectively avoid the permeable of liquid steel. In the actual usage, it may reduce the time of sweeping or gas blowing. It did great job for increasing blowing rate.
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