Reclamation of waste sand
AssigneeResand Oy
InventorsJukka NIEMINEN, Toni WESIN
Life of this patent
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Abstract
A method for a reclamation of waste sand comprising bentonite binder, in which method it is subjected a thermal treatment to the waste sand for removing carbon and absorbed moisture from the bentonite binder in the waste sand, it is subjected a mechanical treatment to the thermally treated waste sand for mechanically separating the sand from the bentonite binder, and it is subjected a cooling effect to the sand separated from the bentonite binder. Additionally, it is introduced an apparatus for a reclamation of waste sand comprising bentonite binder, sand for a building industry product. a foundry sand, or a power plant boiler sand, and a use of reclaimed sand in a building industry product, in a foundry sand, or in a power plant boiler sand.
Claims13
A method for a reclamation of waste sand comprising bentonite binder, the method comprising:
- subjecting a thermal treatment to the waste sand for removing carbon and absorbed moisture from the bentonite binder in the waste sand,
- subjecting a mechanical treatment to the thermally treated waste sand for mechanically separating the sand from the bentonite binder, and
- subjecting a cooling effect to the sand separated from the bentonite binder, wherein the method is carried out by an apparatus comprising:
- a rotating oven having a first end portion and a second end portion and at the first end portion at least one inlet for feeding the waste sand into the oven and at the second end portion at least one outlet for discharging thermally treated waste sand out of the oven,
- a burner at the first end portion of the rotating oven for heating the waste sand fed into the oven for subjecting thermal treatment to the waste sand for burning carbon and evaporating absorbed moisture away from the bentonite binder,
- at least one lifter arranged to capture at least a portion of the waste sand fed into the oven to move with the oven on an inner circumference of the oven until the sand falls back towards a bottom of the oven, the at least one lifter also being arranged to guide the travel of the waste sand in the oven towards the second end portion of the oven and the at least one outlet at the second end portion of the oven,
- a rotating drum having a first end portion and a second end portion and at the first end portion at least one inlet for receiving the at least thermally treated waste sand into the rotating drum and at the second end portion at least one outlet for discharging the sand separated from the bentonite binder out of the drum,
- at the first end portion of the drum at least one section for subjecting mechanical treatment to the at least thermally treated waste sand for separating the sand from the bentonite binder, and
- at least one air exhauster at the first end portion of the drum for causing a non-heated air flow in a direction from the second end portion of the drum towards the first end portion of the drum for cooling the sand separated from the bentonite binder.
An apparatus for a reclamation of waste sand comprising bentonite binder, the apparatus comprising
- a rotating oven having a first end portion and a second end portion and at the first end portion at least one inlet for feeding the waste sand into the oven and at the second end portion at least one outlet for discharging thermally treated waste sand out of the oven,
- a burner at the first end portion of the rotating oven for heating the waste sand fed into the oven for subjecting thermal treatment to the waste sand for burning carbon and evaporating absorbed moisture away from the bentonite binder,
- at least one lifter arranged to capture at least a portion of the waste sand fed into the oven to move with the oven on an inner circumference of the oven until the sand falls back towards a bottom of the oven, the at least one lifter also being arranged to guide the travel of the waste sand in the oven towards the second end portion of the oven and the at least one outlet at the second end portion of the oven,
- a rotating drum having a first end portion and a second end portion and at the first end portion at least one inlet for receiving the at least thermally treated waste sand into the rotating drum and at the second end portion at least one outlet for discharging the sand separated from the bentonite binder out of the drum,
- at the first end portion of the drum at least one section for subjecting mechanical treatment to the at least thermally treated waste sand for separating the sand from the bentonite binder, and
- at least one air exhauster at the first end portion of the drum for causing a non-heated air flow in a direction from the second end portion of the drum towards the first end portion of the drum for cooling the sand separated from the bentonite binder.
Dependencies are inferred from the claim text.