Magnesium Carbon Taphole Sleeve Tapping Hole Refractory Brick for Electric Arc Furnace

Product Description

Split Magnesium Carbon Taphole Sleeve Tapping Hole Brick for Converter Furnace

Introduction to Eccentric Bottom Tapping (EBT) Method
The eccentric bottom tapping method is a highly efficient steelmaking technique.
In this method, the electric furnace is tilted forward by 10° and the tapping hole is opened for steel tapping.
Then, before the slag is entrained, the furnace is tilted back to terminate the tapping process.
Compared with the traditional trough tapping method, this method has the following advantages:
- Reduced Tilt Angle: The conventional tapping angle is 40°, while in the EBT method, it is only 10°.
- Increased Water-cooled Area: The water-cooled area of the furnace wall can reach 90%, and the cost of refractory materials is
reduced by 50%.
- Compact Tapping Process: The tapping time is shortened, secondary oxidation of molten steel is reduced, and the tapping
temperature is lowered.
- Reduced Impact on the Ladle Wall: The service life of the ladle lining is extended
- Energy Saving and Consumption Reduction:
The smelting time is shortened, and the power consumption and electrode consumption are reduced.
- Prevention of Slag Mixing: Through the operation of leaving some steel in the furnace, the effect of secondary refining outside
the furnace is improved.

Selection of Refractory Materials In the EBT tapping method, the selection of refractory materials is of vital importance, which
mainly includes the following parts:
- Sitting Brick: Located on the outer layer of the tapping hole, it is usually constructed with several sections of burned
pitch-impregnated magnesia-carbon sleeve bricks.
- Tubular Brick (Sleeve Brick): The size of the hole diameter is determined according to factors such as the capacity of the
furnace and the tapping time, generally with an inner diameter ranging from 140 to 260 mm.
The impregnated magnesia-carbon bricks using asphalt-modified phenolic resin as a binder are commonly used.
Integral tapping hole bricks are also available, but they are relatively expensive.
- Tail Brick: Exposed to the air for a long time, specially made magnesia-carbon bricks or Al2O3-SiC-C bricks are mostly used.
There is a swinging hinge cover at the lower part of the tail brick, and the tapping hole is sealed with this cover.
The cover is generally made of graphite materials.
- Joint Filling Material:Between the sitting brick and the tubular brick (with a gap of about 25 mm), magnesia-carbon ramming
materials, magnesia or forsterite ramming materials are usually used for joint filling.
- Tapping Hole Draining Sand: To ensure the smooth starting of the EBT tapping system, the tapping hole channel is filled with
specially made draining sand before charging. The draining sand has high refractory performance. When it reaches the tapping
temperature, the surface of the filling material is sintered to prevent the penetration of molten steel. The unsintered draining sand
can flow out smoothly during tapping, and with the pressure of the molten steel, it can break through the sintered layer to achieve
automatic pouring. The filling material has no chemical reaction with the molten steel and will not contaminate the molten steel.
Generally, forsterite sand or magnesium-calcium iron-containing sand is used.

Magnesia Carbon Bricks for the end of EAF tap hole are made from crystal,fused magnesia and high-purity graphite as raw materials;
Good oxidation resistance, high strength, good corrosion resistance, good integrity, easy to replace and long life.
 

I. Main Usage Instructions
It is used at the tapping hole of an electric furnace and serves as a crucial component of the molten steel outflow channel.

The details are as follows:
1. Guiding the Flow of Molten Steel - It provides a dedicated channel for molten steel to flow from the inside of the electric furnace to the ladle, ensuring that the molten steel can flow out of the electric furnace along a predetermined route and angle. Its precise shape and position design can effectively control the flow direction of the molten steel, ensuring a smooth and orderly tapping process, preventing the molten steel from splashing, and enabling the molten steel to be accurately poured into the ladle.

2. High - temperature Resistance and Protection- It can withstand the high - temperature environment during the tapping of the electric furnace. Its main components have the characteristic of high refractoriness (for example, it contains refractory materials such as magnesia - carbon, chrome - corundum, etc.). Under the scouring and erosion of high - temperature molten steel, it effectively protects the furnace body structure around the tapping hole of the electric furnace, preventing the furnace body from being damaged due to long - term exposure to high - temperature molten steel, thus extending the service life of the electric furnace.

3. Assisting in Slag - Steel Separation- During the tapping process, it plays a role in slag - steel separation to a certain extent. It can reduce the situation where slag flows into the ladle along with the molten steel. Since slag contains more impurities and oxides, excessive slag mixed into the molten steel will affect the quality of the molten steel and subsequent refining processes. Through a reasonable structural design and guiding effect during the tapping process, the tapping hole sleeve brick helps to reduce the slag mixed into the molten steel and optimize the quality of the molten steel.

4. Stabilizing the Tapping Process- It helps to stabilize the outflow speed of the molten steel. By factors such as its specific inner diameter, length, and internal structure, it controls the outflow speed of the molten steel, enabling the molten steel to flow out of the electric furnace at an appropriate flow rate. This is not only conducive to improving the tapping efficiency but also ensures that subsequent casting and other process steps can proceed smoothly, avoiding adverse effects on the entire steel - making process due to improper molten steel outflow speed.

 

 

Drawings

Product Parameters

For the taphole brick products:

Physical Analysis	Item			Guarantee
	C. C. S (Mpa)			≥35
	A. P.  (%)			≤ 3. 5
	B. D.  (g/cm3)			≥ 2. 98
Chemical Analysis	MgO(%)			≥ 76
	C (%)			≥15

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.

Our Advantages

Our Advantages of SNREF Ladle Gas Purging System Purge Plug Set Block for Steel Melt Refining

Wear resistant materials to cope with high local turbulence and with consistent dimensional control to fit the purge plug.
Purge Plugs:
 * Uni or omnidirectional, porous or with slots, several designs
 * Large material portfolio to select with our specialists

Plug and Block Assemblies (PBA) reduce your installation challenge and risk.
 

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.