Arrangement for regenerating industrial sand with additive and method thereof

Abstract

In the method, adding (110) an aluminium silicate based additive to industrial sand, heating (120) the industrial sand and the additive added to it, whereby the additive reacts with impurities, that comprise at least alkali metal, in the industrial sand thus forming at least partially melted alkali salts, bringing (130) the heated industrial sand and the alkali salts into a motion occurring in relation to each other, whereby at least part of impurities remaining in the industrial sand adhere to the alkali salts thus forming grains, and separating (140) industrial sand for removing grains from industrial sand. An apparatus for regenerating industrial sand, which apparatus comprises a feeder (220) for feeding industrial sand and an additive to a processing apparatus (300), a processing apparatus (300) for heating the industrial sand and the additive added to it, and further bringing the industrial sand and the additive added to it into a motion occurring in relation to each other, and a separation device (400) configured to separate industrial sand for removing grains from industrial sand.

Dependencies are inferred from the claim text.