Continuous detinning system
AssigneeM&T Chemicals Inc.
InventorsGeorge L. McCauslan, Donald B. Read
Life of this patent
Estimating the term…
Abstract
This invention relates to the recovery of tin as tin metal from tin plate scrap on a continuous basis comprising continuously advancing shredded scrap through an electrically anodic rotating perforated drum partially but not completely immersed in a caustic solution containing no oxidizing agents, plating the tin content of said tin plate scrap upon cathodes disposed obversely and externally to said electrically anodic rotating drum arranged in a longitudinal row on the inside wall of a tank containing said caustic solution.
Claims15
In an apparatus for the recovery of tin as tin metal from tin plate scrap, the combination of a revolving anodic perforated drum having an opening at one end for receiving material, contact means for rendering said drum anodic, a central cylinder inside said drum, drive means for revolving said drum, helical means interposed between said drum and said cylinder, said means dividing the annular zone between said drum and said cylinder into a plurality of flights, each accommodating a quantity of scrap, said helical means being arranged to advance said scrap from the intake end of said drum to the discharge end thereof, a tank for bath solution in which said drum is partially submerged, a plurality of cathode plates obversely and externally to said electrically anodic rotating drum arranged in a longitudinal row on the inside wall of said tank containing said bath solution.
An apparatus for the continuous detinning of tin scrap comprising a vibrating storage hopper for holding a quantity of said tin scrap;
- a vibrating pan with control to receive increments of said tin scrap;
- a feed conveyor to convey said increments of tin scrap from said vibrating pan to a feed chute having a discharge opening at its lower end, a hollow foraminous anodic cylinder rotatably mounted beneath the hopper closely adjacent thereto, the wall of the cylinder closing the discharge opening of the hopper, a central cylinder inside said hollow foraminous cylinder extended on both ends to insulated roller supports and timing drive sprocket, a plurality of helical members interposed between said hollow cylinder and said central cylinder forming a plurality of helical shaped flights, said helical members being arranged to advance said scrap through said hollow foraminous cylinder from the inlet end portion to the outlet end portion thereof;
- a tank for liquid in which said hollow foraminous cylinder is partially submerged, a plurality of plates arranged in longitudinal rows external to said hollow foraminous cylinder said plates cathodically connected to a rectifier connected in circuit with said foraminous anodic cylinder, means for removing detinned scrap from said tank as said scrap discharges from said hollow foraminous cylinder.
In a plant for the continuous recovery of tin as tin metal from tin plate scrap comprising in a sequence of treatment stages means for storing tin plate scrap, means for conveying said tin plate scrap, chute means for said tin scrap, to a revolving anodic perforated drum having an opening at one end for receiving material, contact means for rendering said drum anodic, a central cylinder inside said drum, drive means for revolving said drum, helical means interposed between said drum and said cylinder, said means dividing the annular zone between said drum and said cylinder into a plurality of flights, each accommodating a quantity of scrap, said helical means being arranged to advance said scrap from the intake end of said drum to the discharge end thereof, a tank for bath solution in which said drum is partially submerged, a plurality of cathode plates obversely and externally to said electrically anodic rotating drum arranged in a longitudinal row on the inside wall of said tank containing said bath solution, conveying means for detinned scrap and storage means for said detinned scrap.
A plant for the continuous detinning of tin plate scrap comprising a vibrating storage hopper for holding a quantity of said tin scrap;
- a vibrating pan with control to receive increments of said tin scrap;
- a feed conveyor to convey said increments of tin scrap from said vibrating pan to a feed chute having a discharge opening at its lower end;
- a hollow foraminous cylinder rotatably mounted beneath the hopper closely adjacent thereto, the wall of the cylinder closing the discharge opening of the chute;
- a central cylinder inside said hollow foraminous cylinder extended on both ends to insulated roller supports and timing drive sprocket;
- a plurality of helical members interposed between said hollow cylinder and said central cylinder forming a plurality of helical shaped flights, said helical members being arranged to advance said scrap through said hollow foraminous cylinder from the inlet end portion to the outlet end portion thereof;
- a tank for a bath solution in the absence of oxidizing agents in which said hollow foraminous cylinder is partially submerged;
- a plurality of cathodes arranged in a longitudinal rows external to said hollow foraminous cylinder, said cathodes being substantially concentric with said hollow foraminous cylinder and said central cylinder, said tank containing heating panels and a continuous conveyor disposed beneath the discharge end of said hollow foraminous cylinder to continuously convey detinned scrap longitudinally and upwardly out of said tank at an angle to the vertical of said tank, said conveyor extending beyond the extremity of said tank;
- means for spray washing that portion of said conveyor and said detinned scrap extending beyond the extremity of said tank, and hopper means to collect detinned scrap from said conveyor.
Dependencies are inferred from the claim text.