High-Quality Dry Vibration Mixes for Steel Mill Applications

• Customization: Available
• Classification: refractory Tundish dry vibration mix
• Production Process: refractory Tundish dry vibration mix
• Model NO.: Mgo 90% min.
• Refractoriness (℃): 1770< Refractoriness< 2000
• Shape: Powder
• MGO: 90% Min
• Cao: 2.0% Max
• Fe2o3: 2.70 Max
• Al2O3: 1.30% Max
• Sio2: 3.50% Max
• C: 2.0% Max
• Grain Size: 0-5 mm
• Bulk Density: 2.20 g/cm3 Min.
• Max Temp Use: 2000 ºC
• Feature: Instant Materials
• Type: Refractory Material
• Material: Castable
• Vibration: powdar
• Steel plant: application
• Tundish: lining
• Transport Package: Polybag
• Specification: 1MT
• Origin: China
• HS Code: 2519902000
• Production Capacity: 30000mt/Year

Product Description

PRODUCT: TUNDISH DRY MIX (MEZCLA SECA DE VIBRACIÓN TUNDISH)

Sinometal's series of dry vibration mixes are expertly crafted for tundish working linings. These products boast remarkable adhesion and effortless dry-out characteristics. Additionally, these mixes provide superior protection against refractory pollution in molten steel. By eliminating the need for water during installation, the drying process is significantly expedited, positioning these mixes as an exceptional alternative to traditional insulating boards and coating mixes.

Tundish Dry Vibration Mix
(The construction and maintenance of the work lining)

 

1. Preparation before construction

1. Ensure the availability of gas, compressed air, and industrial electricity, verifying there are no leaks and that all valves are securely closed.

1. Inspect all control instruments and vibration motors to confirm they are operating efficiently.

1. Examine raw materials for any signs of agglomeration. Materials with severe agglomeration should be discarded, while minor agglomerations should be crushed prior to use or disposed of.

1. Remove any residue from the permanent lining surface of the tundish, including residual steel and other debris.

1. If any crack ≥3mm is present in the permanent lining of the tundish, carry out necessary repairs and ensure the repair material is thoroughly dried before proceeding with construction.

1. Apply a uniform layer, 2~3mm thick, of release agent (or a mix of waste engine oil + graphite) onto the working lining tire.

1. Construction

1. Transport the tundish to the designated construction site at the scheduled time.

1. Evenly distribute the dry material around the tundish at the construction site, then carefully open the packaging.

1. Begin construction when the wall temperature is below 100 °C. If temperatures are elevated, utilize a fan for cooling.

1. Package Bottom Construction: Arrange bricks, impact plates, stabilizers, retaining walls, and dams on the package bottom using welded steel frames or hard fiberboards. Pour the dry material into the package bottom and smooth it with a shovel, ensuring the thickness meets the required 100 mm.

1. Mold Tire Lifting: Utilize a crane to position the mold tire into the tundish. Adjust its position using the positioning rod to achieve the design thickness, ensuring a 75mm dry wall thickness. Maintain a consistent gap between the tire and the permanent lining with less than 5 mm error to prevent thinning, which could compromise durability. If the dry material at the bottom is uneven or if the tire isn't vertical, uplift the tire and re-level the package bottom. Install the slag wall and dam retaining groove mold subsequently.

1. Construction Wall: Commence by strategically placing small packs of premium dry materials along the designated points of the tire. Lovingly layer these materials with care and precision, ensuring an even distribution at each point. Pour them into the gap between the package and the permanent lining, reaching up to the mouth's position. Remember, don't drop more than 300 mm per layer to prevent any material segregation. Activate the vibration motor, continuing to pour until the cavity is fully filled. Typically, let the motor vibrate for about 5 minutes, although this may vary based on motor excitation strength. If unforeseen circumstances arise during construction, such as motor malfunctions, employ a stick like steel brazing to gently tamp the dry materials, extending vibration time as necessary to ensure a flawless finish. Address all issues promptly, and crucially, keep the area free from ropes or debris to guarantee the tundish's safe and efficient operation.

1. Low-Temperature Baking: Begin by opening the air valve, infusing the mold tire with air for 5 to 10 minutes to reduce gas concentration to safe levels. With the main air valve open, proceed to open each gas sub-valve sequentially, igniting immediately post-opening. Should any anomalies arise, swiftly close the main gas valve, conduct thorough checks, and proceed with ignition as per protocol. Adjust the burner's flame to achieve the optimal temperature, maintaining a controlled environment within the mold cavity between 200 to 250 °C. Ensure the baking time spans 50 to 60 minutes, adjusting as needed based on the baking temperature, to achieve the desired results.

1. Turn Off the Fire: Once baking achieves the requisite standards-indicated by the dry material's color transformation to approximately 1/3, or it becoming hard or sticky-cease the fire by first halting gas flow, then air. Should individual burners exhibit insufficient firepower, extend their burning duration accordingly. Upon extinguishing the fire, close both the main and sub-valves, allowing for over an hour of natural cooling. If the tire remains excessively hot, forced cooling with compressed air is an option, though it may result in fine cracks that won't affect functionality. Conduct demolding once the control temperature is under 100 °C, ensuring a precise gap between the package tire and the working lining.

(9) Demoulding: Employ a crane to gracefully lift the membrane to its destined location. When demoulding, emphasize vertical and gradual lifting, applying uniform force to safeguard the meticulously crafted lining against potential damage or transverse cracking. Post-demolding, diligently inspect the working lining's thickness and strength, addressing any issues with urgency to maintain peak quality.
a) Minor cracks in the work lining (under 5mm): Swiftly repair using high-grade fire mud to restore integrity;
b) Should the dry material incur localized damage (covering no more than 0.5m2), execute repairs with carefully spread material to restore its flawless finish;
c) For more extensive damage (exceeding 0.5m2), necessitate re-seating the tire. Proceed to fill the affected areas with dry material, employing the time-tested vibrating baking technique to ensure complete restoration.

(10) Install the Flow Stabilizer: Meticulously clean the bag's interior and lay a robust foundation using dry materials. When constructing, gently maneuver the brick body along the horizontal plane until seamless contact is achieved. Employ dry materials around the stabilizer for assured stability and optimal performance.

(11) Installation of Slag Wall and Dam: Adhere to drawing specifications to pinpoint the ideal installation sites for the slag wall and dam. Utilize a crane for precision placement, ensuring perpendicular alignment with the central package, and apply a protective coating material around the perimeter for enhanced durability.

(12) Install the Brick: Remove any pre-embedded steel frames, positioning bricks according to precise specifications. Ensure bricks are laid flat and accurately, filling with dry material for a solid foundation. Install the nozzle per requirements, with dry material meticulously placed around the upper nozzle for a pristine finish.

Note: 4d5e375a

 

MgO	90,00% min.
CaO	2.0% max.
Fe2O3	2.70% max
Al2O3	1.30% max
SiO2	3.50% max
C	2.00% max
Grain Size:	0 - 5 MM
Bulk Density:	2.20 g/cm3 min.
Max Temp Use:	1700ºC