Method for processing ash from waste incineration plants by means of wet classification
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United States of America Patent
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Feb 26, 2019
Grant Date -
Oct 27, 2016
app pub date -
Dec 9, 2014
filing date -
Dec 23, 2013
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Abstract
A method for processing ash from waste incineration plants by wet classification includes mixing the ash with a liquid in a mixing hopper. After screening, the mixture is fed to a first classifying stage, including an upflow classifier and an upstream hydrocyclone, where it is separated into a good fraction and a residual fraction. The residual fraction is drawn off as a suspension on an upper side of a fluidized bed of the upflow classifier. The good fraction is drawn off on an underside of the fluidized bed. A pass through fraction is fed back into the hydrocyclone installation and a material flow containing particles which are smaller than a separation particle size is separated as cyclone overflow. The cyclone overflow is separated in a second classifying stage into a fine particle mineral fraction and a residue which has a grain size upper limit between 20 μm and 50 μm.
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