Power plant boiler sand comprising discarded foundry sand, use of power plant boiler sand, method for producing power plant boiler sand and apparatus for producing power plant boiler sand
AssigneeResand Oy
InventorsToni Wesin, Jukka Nieminen
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Abstract
Power plant boiler sand comprising a clay-based binder film (3) on the surface of a grain of sand (2). In addition, a method and apparatus for producing power plant boiler sand.
Claims26
Power plant boiler sand comprising a clay-based binder film on the surface of a grain of sand, wherein the power plant boiler sand is formed from air- cooled discarded foundry sand comprising clay-based binder and from which a fine fraction has been separated, the fine fraction being a sand portion in a predetermined size range.
A method of using discarded foundry sand comprising clay-based binder, the method comprising applying the discarded foundry sand as power plant boiler sand, wherein the discarded foundry sand is air cooled, and wherein a fine fraction is separated from the discarded foundry sand prior to the discarded foundry sand being applied as the power plant boiler sand, the fine fraction being a sand portion with a predetermined size range, the power plant boiler sand having a clay-based binder film.
A method of making power plant boiler sand, the method comprising:
- receiving discarded foundry sand comprising a clay-based binder;
- air cooling the discarded foundry sand;
- separating a fine fraction from the discarded foundry sand, the fine fraction being a sand portion with a predetermined size range;
- and
- providing the air-cooled discarded foundry sand with the fine fraction removed therefrom for use as the power plant boiler sand, the power plant boiler sand including a clay-based binder film from the clay-based binder in the discarded foundry sand.
Dependencies are inferred from the claim text.