PROCESS AND APPARATUS FOR TREATING ASH

摘要

In invention relates to a process that comprises the steps in which ash generated in the combustion of carbon-containing material and water are led into a mixing vessel 100 in order to form a water-ash mixture, in which the water-ash mixture is mixed, the mixture is settled in order to form a surface layer 10, an intermediate layer 20 and a bottom layer 30 either in the mixing vessel 100 or in at least one settling vessel 200, the surface layer 10 is separated and led out through at least one outlet 40 in order to form a surface fraction, the intermediate layer 20 is separated and led out through at least one outlet 50 in order to form a liquid fraction, and the bottom layer 30 is separated and led out through at least outlet 60 in order to form a bottom fraction. The invention also relates to an apparatus for fractionating ash, the apparatus comprising at least one mixing vessel 100, means 70 for feeding ash into the said at least one mixing vessel 100, means 80 for feeding water into the said at least one mixing vessel 100, means 90 for mixing the mixture of water and ash in the said at least one mixing vessel 100, means 45 for separating the surface fraction from the mixture, means 50 for separating the liquid fraction from the mixture and means 60 for separating the bottom fraction from the mixture.