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Foundry Processes

Foundry processes can be divided into two types:- ferrous foundries and non-ferrous foundries. Foundry processes involve making the mould and the core, melting and pouring the metal into the mould, and finally removing the mould and core and finishing the product. Although different processes differ in the number of steps required to make the final product.

Metal casting process starts with creation of mold. Metal that can be molted will be poured into this mould and cooled. The form of metal being used and shape of final product required would decide the material, which will be used to make the cast. A commonly used molding material is sand. 

After the metal has been melted, it is poured into the cast already made previously and made to cool and set. Silica sand, moisture, oils and green sand are mixed together to form a mould cavity. Metal is then poured in this cavity. When the metal is cooled, it is easily separated from the mould. 

The wastes produced by foundries depend on the type of metal, foundry types.gaseous wastes are usually the largest pollutants. They contain metal, semi-volatile and volatile organic compounds. Emission control systems can be installed to capture these gases.

Liquid wastes in foundry results from water used to chill metal. Water used for cleaning the floor & other maintenance can also formulate liquid waste. A water treatment plant can be installed for water waste.

Solid wastes come from slag, sand, spent refractories, and emissions control dust. For this various process like sand reclamation, attrition sand reclamation, dry sand reclamation, wet sand reclamation, etc is used. Sand may also be recycled for outside processes.

Slag and emission are also a waste produced by a foundry. These can be fed back to furnace to recover any metal, which can possibly be recovered.

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