Non-Ferrous Foundries represent a wide range of casting applications of several metal alloys.
Not only the type of alloy but also its process and applications vary considerably, and the specific needs in terms of refractories may therefore be also be quite different and specific. In any case, the types of melting and holding furnaces are few. Even though the chemical requirements may be different, the guidelines for the refractory applications are quite clear and straightforward: efficiency and easiness of use.
The main criteria behind the product range are:
- Purity of the processed alloy
- Resistance against penetration of low melting metals (typically zinc)
- Friendliness and ease of installation
- Reduction of pollutants and emissions
- Energy saving
Seven Refractories has developed a full range of refractories to cover all needs of the non- ferrous foundry industry and the different alloy: such as pure copper, bronze, brass or zinc. Among the different products for foundry users, no cement chemical bond refractories have to be highlighted as an easy to install and dry-out product range for the most demanding applications. They are monolithic based on a non-hydraulic bonding system which allows for higher permeability to gases and therefore much faster dry-out. No cement refractories should be considered in any refractory application with urgent need of repair and restart of operation or whenever it is difficult to perform a proper dry-out.
Coreless induction furnace (CIF)
The CIF is a very common piece of equipment, flexible and well suited to melt small to medium size batches. Dry refractory mixes are the normal lining for this kind of furnace.
Channel induction furnace
It is the typical furnace used for holding purpose as a buffer between the casting line and the melting (cupola) furnace. The power is induced through the inductor in the bottom around a loop of molten metal, where failures of refractory lining are most likely to occur.