An object of the invention is to provide an effective and economical process for separating ash particles from a mixture of ash and regenerated adsorbent particles contained in an aqueous slurry without increasing the volume of {TAIL ~ wastewater} containing {HEAD ~ ash particles} 
An object of the invention is to provide an effective and economical process for separating ash particles from a mixture of ash and regenerated adsorbent particles contained in an aqueous slurry without increasing the volume of { TAIL ~ wastewater } containing { HEAD ~ ash particles }
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