Addition of new sand

Compensation for discharge of worn mold material as well as mold material output losses.

Due to the mechanical, thermal, and chemical loads certain wear products occur in the mold material cycle. Examples include quartz sandfines, inactive clay contents, decomposition products of coal dust or core binders, oolitized quartz grains.

The flow of coresand particles can also introduce harmful wear products. They all accumulate in the mold material system. By means of controlled feeding of new sand and discharge of the same amount of worn mold material (s. Mold material balance) it is possible to ensure that specified limits are not exceeded to thus maintain a specific level properties.


The adjustment of the sediment content is of particular importance. Moreover, new sand must be added to compensate for the mold material output losses.

Additional references:
Mold material management
Mold material recovery
Mold material control
Sand conditioning
Sand reclamation