Porous Purging Plug: Core Equipment for High-Temperature Metallurgical Refining
Product Description
1. Product Definition
The Porous Purging Plug, also known as a porous brick, is a crucial device installed at the bottom of ladles, metallurgical vessels, etc. It is the core component for realizing the bottom-blowing refining process and plays a vital role in high-temperature metallurgical processes. The porous purging plug is usually made of materials with high refractory properties and has a special pore structure or gas channels inside, enabling inert gases (such as argon) to be uniformly and stably introduced into the molten metal. Installing a porous purging plug at the bottom of a refining ladle and blowing argon into the molten steel through it can effectively stir the molten steel and promote various metallurgical reactions.
2. Working Principle
The working principle of the porous purging plug is based on the permeation and diffusion of gases. When connected to an external inert gas source, the gas, under a certain pressure, passes through the pores or preset gas channels inside the porous purging plug and is uniformly dispersed into the molten metal in the form of tiny bubbles. These bubbles, during their upward movement, stir the surrounding molten metal, making the temperature and composition of the molten metal more uniform. In the steelmaking process, the argon bubbles blown through the porous purging plug can drive the circulation of the molten steel, accelerate the floating and removal of inclusions in the molten steel, and also contribute to the full progress of chemical reactions such as desulfurization and deoxidation.
3. Product Advantages
- Excellent Thermal Shock Stability: The porous purging plug is made of high-quality refractory raw materials and has excellent resistance to rapid temperature changes. In a high-temperature metallurgical environment, frequent temperature fluctuations will not cause serious damage to it, and it can maintain a stable structure and performance. During the ladle refining process, the temperature of the molten steel is around 1600°C. The porous purging plug can still work normally under such high-temperature and frequently changing temperature conditions without problems such as cracking and spalling due to thermal shock.
- High Erosion Resistance: It has strong resistance to molten metal, slag, etc. The selected materials can effectively resist the scouring and chemical erosion of high-temperature liquid substances, thus extending the service life. During the ferroalloy refining process, the slag has strong corrosiveness. The porous purging plug can operate stably for a long time due to its high erosion resistance, reducing the replacement frequency.
- Precise Gas Flow Control: It can accurately adjust the gas flow according to different metallurgical process requirements. By reasonably designing the internal structure and selecting appropriate materials, stable control of the gas flow is achieved, ensuring the accuracy and stability of the metallurgical process. In different stages of steelmaking, for example, a larger gas flow is required in the initial stage of refining to quickly stir the molten steel, and a smaller flow is needed for fine-tuning in the later stage. The porous purging plug can meet such precise flow control requirements.
- Improve Metallurgical Quality: Through the effective stirring of the molten metal, it significantly improves the uniformity of the temperature and composition of the molten metal, promotes the removal of impurities and the progress of metallurgical reactions, and thus improves the quality of metal products. When producing high-quality steel, the porous purging plug can help reduce defects such as pores and inclusions in the steel, and improve the strength, toughness, and other properties of the steel.
- Environmental Protection and Energy Saving: In the metallurgical process, the use of the porous purging plug helps improve energy efficiency and reduce unnecessary energy consumption. At the same time, the good metallurgical effect also reduces the reject rate and indirectly reduces the impact on the environment. Reasonable gas stirring can make the metallurgical reaction more complete, reduce energy waste caused by incomplete reactions, and also reduce waste of resources and potential pollution to the environment due to defective products.
Hot Sales Types
-Slot Plug(slit plug)
Slot plug is the most common structure in purging plug.
The gas channel could be designed and customized according to actual on-site using conditions, including refining steel grade,
refining workmanship, ladle capacity, temperature, hydrostatic pressure of liquid steel etc.
This can achieve the best blowing effect for purging plugs, ensure the longest service life, safety, stability and best air
permeability.
-Porous plug
Porous plug has better porosity and permeability.
Production technology is adding carbon-containing compound into mixture, since carbon-containing compound can burn out without
residue at low temperature, so we adopt low temperature burning out intermediate materials to get the initial porosity.
In porous type plug, inside distributes interpenetrating gas channels in different sizes.
When blowing stop, the steel and slag from ladle will infiltrate into the deep areas of the plug, to form a secure layer on working surface.
-Segment Plug
The segment plug is preferably made of good anti-stripping materials, the block body is not easy to occur fracture, with longer service life. The cracks between different plates will not expand, so this segment plug design can avoid failure of bottom blowing caused by tranverse brick fracture.
Application characteristics: In order to adapt to more and more strict refining conditions(especially special steel), and to meet the requirements of increasing ladle life, the volume of plug becomes bigger and bigger. However the traditional slit type plug has single material and single structure, easy to cause the phenomenon of tranverse fracture and failure of air blowing. Our researched segment plug has successfully soved the problem of fracture existing in traditional slit plug. Significantly increasing the stability of refining process, ensuring the realization and improvement of quality refined steel.
-Hybrid Plug
Secondary refining technology is the most important part in steelmaking process
It can adjust the steel alloy type and liquid temperature.
Purging plug and block is the key functional component to make this process carried out.
As the ladle tends to develop in larger scale, the melting temperature and time have been improved significantly, which makes the
using environment for refractory materials more and more strict. Therefore, it is necessary to further improve the performance of
purging plugs and blocks to meet the increasing demands in current steelmaking technology
-Overall breathable brick:
This product adopts high purity raw materials, through vibration casting and low temperature heating process workmanship.
Function is blowing argon gas via purge plug to ladle.
With the feature of high strength, good thermal stability, erosion resistance and abrasion resistance.
Widely used in steel plants LF, LF-VD, CAS-OB refining ladle
We manufacture various high-quality ladle refractory according to the clients' needs , and to ensure the stability and accountability of the quality.
Product Parameters
Technical data will be customized according to your steel making condition.
| Chemical and Physical Properties |
SNLWB-85 |
SNLWB-90 |
SNLWB-95 |
| Al2O3 +MgO % min |
85 |
90 |
95 |
| Cr2O3 (C) % min |
0 |
2.5 |
2.5 |
| Apparent porosity g/cm3% max |
15 |
13 |
13 |
| Bulk density g/cm3 % min |
3.0 |
3.05 |
2.9 |
| Normal temperature Compressive strength (MPa) min |
80 |
100 |
100 |
| Breaking strength 1500°C×3hmin |
23Mpa |
2.Well block and segment plug
| Chemical and Physical Properties |
(Well block) |
(purging plug) |
| AL2O3 % |
>=85 |
>=85 |
| MgO% |
3-5 |
1-3 |
| Cr2O3 % |
----- |
>2.4 |
| Bulk density g\cm3 |
>=3.0 |
>=2.9 |
| Apparent Porosity % |
<=16 |
<=18 |
| Cold crushing strength Mpa |
110ºC*24h |
>=60.0 |
>=80.0 |
| 1500ºC*3h |
>=100.0 |
>=80.0 |
| Refractoriness under load : ºC |
>=1680 |
>=1680 |
| Modulus of rupture 1400ºC *1h Mpa Mpa |
>=15.0 |
>=15.0 |
| Linear change 1500ºC*3h % |
±0.2 |
±0.2 |
| air permeability, m3/hour at P=4 bar |
30M3/H |
Packaging & Shipping
Product packaging
1- International standard seaworthy exportable packing.
2- Wooden pallet.
3- Wooden / bamboo case (box).
4- Further packing information will be based on customer's requirements.
Company Profile
Shandong Sinorefractory New Materials Co.,Ltd (SinoRefractory)has been focusing on international marketing of flow control refractories in iron and steel industry for 17 years.
SinoRefractory is the second generation of refractories export enterprise developed out of EMEI Group.Supported by one of China's largest production bases in functional refractory materials.
Through years of development in the field of exporting top quality refractories to worldwide markets,SinoRefractory aims at researching,producing,marketing and exporting high standard Ladle slide gate plate,Ladle Nozzles,Well blocks,Purging plugs,Nozzle stuffing sand,Refractory castables, Slide gate Mechanisms etc.
Up to now,SinoRefractory has supplied high quality refractory products and services to nearly 70 top-hundred global steel enterprises.
SinoRefractory will always put clients'interest in the first place,striving to provide a wide range of services,including technical solution,pre-sales support,after-sales services,installation team support,professional know-how according to the changing of steelmaking condition,etc.
We are not only selling products,we are more focused on supporting,developing and growing together with clients.
FAQ
Below are some RFQ and answers about ladle and tundish flow control refractories:
Q: What are the requirements for refractories for ladle?
A: The requirements of refractories for ladle mainly include:
* high temperature resistance
* thermal shock resistance
* resistance to the erosion of the slag
* high temperature with sufficient mechanical strength
* the lining has a certain degree of expansion
Q:What are the reasons for the destruction of refractories for ladle?
A: The main causes of damage are as follows:
When the ladle transports high-temperature molten steel, the high-temperature molten steel and slag at about 1680ºC scour and erode it, especially in the slag line part, the scouring and erosion is more serious, and it is an important factor to decide the service life of the ladle.
LF and other extra-oven refining treatment on the unburnt brick damage is serious.
Q:What steel grades are different materials of slide plate bricks suitable for respectively?
A: Different materials of slide plate bricks are applicable to different steel grades. For example,
Al2O3-ZrO2-C slide gate plate can be used as ladle sliding gate plate due to its excellent erosion resistance and thermal shock stability, which can adapt to the casting of various steel grades, and ther are the following materilas based on customer's steel making condition: the MgO-C, MgO-Al-C, MgO-Al-C, MgO-Al-C, MgO-Al-C, MgO-Al-C, MgO-Al-C, MgO-Al-C, MgO-Al-C, and so on.
For more details, feel free to send inquiry to us.
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