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AssigneeCarad, Inc.
InventorsBoyd E. Cass, David W. Coate, Joseph R. Quigley
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The present invention relates to a method and apparatus of recovering by-product fines, such as coal fines, by-product fines created in the manufacture and processing of metals or any very finely divided substance which may be of value when recovered to a usable form and which may be naturally found in the form of a silt or as the result of the manufacturing process, from a slurry or sludge thereof. The slurry mass is first treated to dissociate it into discreet units, if required, for further treatment to recover the fines contained within the discreet units of the slurry in the form of a usable end product. The discreet units of the dissociated slurry are conveyed through a rotary-driven impeller feed conveyor and simultaneously a hot gas such as air or superheated steam is flowed through the conveyor in contact with the slurry segments or discreet units. This combined action of the rotary impeller feed and the flow of hot air uniformly breaks up and dries the discreet slurry units into particles of desired moisture content. If additional drying is required, the present invention teaches the use of a second rotary-driven impeller feed conveyor in which the extruded agglomerates are conveyed while again simultaneously flowing a hot gas through this second conveyor in contact with the agglomerate to break up or size and further dry the agglomerates to a desired degree.
The method of recovering fines from a sludge thereof comprising the steps of loosely conveying the sludge through a tubular conveyor housing with a continuous rotary-driven impeller, and simultaneously flowing a hot gas in contact with the sludge being conveyed through the conveyor housing to uniformly break up and dry the sludge by evaporation into particles of desired moisture content.
The method of recovering fines from a slurry thereof comprising the steps of dissociating the slurry mass into discreet units, loosely conveying the dissociated slurry through a tubular conveyor housing with a continuous rotary-driven impeller while simultaneously flowing hot gas in contact with said discreet units through said conveyor housing to uniformly break up and dry said discreet units by evaporation into particles of desired moisture content.
The method of recovering coal fines from a slurry thereof having a moisture content in the area of 30% or more, comprising the steps of dissociating the slurry mass into discreet units, loosely conveying the dissociated coal slurry through a tubular conveyor housing with a continuous rotary-driven impeller while simultaneously flowing hot air in contact with said discreet units through said conveyor housing to uniformly break up and dry said discreet units by evaporation into particles having a moisture content of about 15% to 25%.
Apparatus for recovery of fines from a slurry thereof comprising means to dissociate the slurry mass into discreet units, conveyor means fed in tandem from said dissociation means and having a tubular conveyor housing with a continuous rotary-driven impeller to break up said discreet units into particles while loosely conveying the same, and means for forcing hot gas through said conveyor housing to dry said particles by evaporation to a desired degree.
Apparatus for recovery of fines from a slurry thereof comprising conveyor means having an elongated continuous rotary-driven impeller to break up and loosely convey said slurry, and means for forcing hot gas through said conveyor in contact with the slurry being conveyed to dry the same by evaporation to a desired degree.
Dependencies are inferred from the claim text.