An aluminum launder is a refractory-lined channel or transfer system used to safely transport molten aluminum from a furnace, holding furnace, or melting unit to casting and other downstream processing equipment.
In aluminum plants, the launder plays an important role in maintaining stable molten aluminum flow while minimizing heat loss, turbulence, oxidation, and contamination during transfer.
An aluminum launder is mainly used to:
Transfer molten aluminum between furnaces and casting equipment
Control the direction and flow of molten aluminum
Reduce heat loss during aluminum transfer
Minimize turbulence and oxide formation
Maintain stable molten aluminum flow to the casting line
Connect different sections of an aluminum production line
Depending on the production process, a launder can be installed between a melting furnace, holding furnace, filtration system, degassing unit, distribution box, or casting machine.
Molten aluminum flows through the launder under controlled conditions. The internal refractory lining provides thermal insulation and protects the metal-contact surface from high-temperature molten aluminum.
A properly designed launder should provide:
Smooth and stable molten aluminum flow
Suitable flow capacity
Good thermal insulation
High resistance to thermal shock
Resistance to molten aluminum corrosion and erosion
Easy installation and maintenance
The design of the launder depends on the aluminum alloy, molten metal temperature, flow rate, production capacity, furnace layout, and casting equipment.
An aluminum launder typically consists of a steel outer structure and a refractory lining or castable working lining.
The refractory material is selected according to the operating temperature, molten aluminum contact conditions, required service life, and production process.
For demanding applications, the lining may be designed to provide improved resistance to:
Molten aluminum penetration
Corrosion
Erosion
Thermal shock
Thermal cycling
The correct refractory lining is important because it directly affects the service life and reliability of the launder.
Different aluminum plants may use different launder configurations, including:
A straight launder is commonly used for simple molten aluminum transfer between two production units.
Customized launders are designed according to the plant layout, furnace position, casting machine, transfer distance, and required flow direction.
A refractory-lined launder provides thermal protection and a durable working surface for continuous molten aluminum transfer.
For more complex production lines, the launder can be integrated with filtration, degassing, heating, or distribution equipment.
When selecting an aluminum launder, aluminum plants should consider more than the channel dimensions. Important factors include:
Molten aluminum flow rate – The launder should handle the required production capacity without restricting flow.
Furnace and casting line layout – The dimensions and configuration should match the actual installation space.
Molten aluminum temperature – The refractory lining must be suitable for the operating temperature.
Alloy and process conditions – Different alloys and production processes may require different lining materials.
Transfer distance – Longer transfer distances require careful consideration of thermal insulation and heat loss.
Maintenance requirements – The structure should allow convenient inspection, cleaning, and refractory maintenance.
For aluminum plants, a custom-designed launder system is often more practical than a standard-size channel because production lines, furnace configurations, and casting equipment vary from plant to plant.
The refractory lining is one of the most important components of an aluminum launder. It separates the molten aluminum from the structural shell and provides resistance against high temperature, erosion, corrosion, and thermal cycling.
A suitable refractory lining can help improve launder durability and maintain a stable molten aluminum transfer process.
Proper drying and preheating are also important before putting a newly installed refractory-lined launder into operation. This helps remove residual moisture and gradually brings the lining to the required operating condition.
Longzhyi provides custom refractory-lined aluminum launder systems for aluminum plants and foundries.
Our launder solutions can be designed according to your furnace layout, molten aluminum flow rate, transfer distance, casting equipment, installation space, and operating conditions.
From launder dimensions and refractory selection to manufacturing and installation requirements, the system can be developed around the actual production line.
Looking for an aluminum launder for your production line? Contact Longzhyi with your furnace layout, required capacity, and launder dimensions for a customized solution.
