Sand used in industry
AssigneeResand Oy
InventorsJukka Nieminen, Toni Wesin, Kalle Kekäläinen
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Abstract
In the disclosed solution, a method is described for producing sand used in industry, in which method discarded power plant and/or foundry sand is processed into sand for use in products of the construction industry and/or into foundry sand via pre-treatment, drying, and after-treatment. In addition, an apparatus is described for producing sand used in industry, and use of discarded power plant and/or foundry sand in products of the construction materials industry or in foundry industry.
Claims8
A method for producing sand usable in industry, the method comprising:
- processing discarded power plant sand into sand for use in construction industry products and/or into foundry sand, by pre-treatment, drying, and after-treatment,
- wherein the pre-treatment comprises prescreening, grinding, washing and separation of liquid and fines, wherein the sand is ground by water grinding, wherein the grains of sand are mechanically ground against each other so that a shell formed of a binding agent and surrounding the grains of sand is broken and the binding agents detach from the surface of the grains of sand and dissolve in the liquid, and
- wherein in the grinding and/or separation of liquid and fines, liquid and/or at least one mixture of liquid and fines is added, which liquid and/or at least one mixture of liquid and fines comprises at least water and additive.
A method of using discarded power plant sand, the method comprising:
- having discarded power plant sand that has been processed by pre-treatment, drying, and after-treatment,
- wherein the pre-treatment comprises prescreening, grinding, washing and separation of liquid and fines, wherein the sand is ground by water grinding, wherein the grains of sand are mechanically ground against each other so that a shell formed of a binding agent and surrounding the grains of sand is broken and the binding agents detach from the surface of the grains of sand and dissolve in the liquid, and
- wherein in the grinding and/or separation of liquid and fines, liquid and/or at least one mixture of liquid and fines is added, which liquid and/or at least one mixture of liquid and fines comprises at least water and additive;
- and
- applying the processed power plant sand in a construction materials industry product or in a foundry industry product.
Dependencies are inferred from the claim text.