Regeneration of water glass sand using pneumatic systems

10 Regeneration of water glass sand using pneumatic systems 

This technique has a lower performance than the thermal regeneration of organically bound sands. The following limitations occur lower immediate compressive strength shorter applicability times of the core sand mixtures stability loss upon storage of cores 

In order to compensate for these problems, changes to the processing scheme or the binder mixes are needed. 

The application of water glass sand as a binder has a low environmental impact, compared to the application of organic binders. This technique allows the (partial) regeneration of the water glass bonded sand and thus reduces the need for used sand disposal and primary raw material 

In order to heat up the sand, natural gas is combusted. The corresponding C02-emission is estimated to be 18 kg/tonne of used sand. NOx emissions will also occur. 

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