Suitable for mass production of products made from the same alloy, especially for applications such as can stock, foil stock, and PS plates; also applicable to aviation aluminum alloys, high-purity aluminum capacitor foils, and double-zero foils. Its flow rate ranges from 5 to 100 tons per hour. Custom non-standard designs are available based on flow rate requirements, with common standard models including 75-ton, 55-ton, 35-ton, 25-ton, and 10-ton series.

Filtration Principle

The deep bed filtration box consists of a filtration box body and a deep bed filter. 

1. Filtration Box Body**: The inner lining prefabricated parts are made of high-quality castables selected according to the quality requirements of aluminum melt. After high-temperature pre-sintering, they feature high strength, erosion resistance, scour resistance, no slag formation, and no aluminum adhesion. 

2. Thermal Insulation Layer**: Multiple layers of thermal insulation materials with excellent heat retention are installed between the steel structure and the inner lining prefabricated parts. The insulation layer is a multi-layer composite structure composed of a nano-insulation layer, a calcium silicate layer, and an anti-leakage layer. The nano-insulation layer has excellent thermal insulation performance to reduce the surface temperature of the shell; the anti-leakage layer can effectively prevent aluminum leakage caused by minor cracks in the inner lining. 

3. Deep Bed Filter**: It uses alumina balls and gravels sintered via a special process as filtration media. The filtration layer is formed by stacking evenly sized alumina balls (with a diameter of 1/2 or 1/4 inch) and an alumina gravel layer (approximately 3-6 mm), supported by a supporting grid plate at the bottom to form the bed structure. 

Molten aluminum passes through the gaps (with a length of over 400 mm) formed between the gravels. Impurities and inclusions are captured by the filtration layer and separated from the molten aluminum, enabling effective filtration of slag in the molten aluminum. The filtration effect can be enhanced by adjusting the filtration media: smaller gaps between media, thicker filtration media, and lower molten aluminum flow rate all contribute to better performance. This design can meet the filtration requirements of most high-end aluminum products.