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Title: Apparatus for magnetic separation of paramagnetic and diamagnetic material

Abstract

The present invention relates to methods and apparatus for segregating paramagnetic from diamagnetic particles in particulate material and, in particular, to the open gradient magnetic separation of ash producing components and pyritic sulfur from coal. The apparatus includes a vertical cylinder and a rotatable vertical screw positioned within the cylinder, the screw having a helical blade angled downwardly and outwardly from the axis. Rotation of the vertical screw causes denser particles, which in the case of coal include pyritic sulfur and ash, which are paramagnetic, to migrate to the outside of the screw, and less dense particles, such as the low sulfur organic portion of the coal, which are diamagnetic, to migrate towards the center of the screw. A vibration mechanism attached to the screw causes the screw to vibrate during rotation, agitating and thereby accommodating further segregation of the particles. An open gradient magnetic field is applied circumferentially along the entire length of the screw by a superconducting quadropole magnet. The open gradient magnetic field further segregates the paramagnetic particles from the diamagnetic particles. The paramagnetic particles may then be directed from the cylinder into a first storage bin, and the diamagnetic particles, which are suitable for relatively cleanmore » combustion, may be directed into a second storage bin.« less

Inventors:
 [1]
  1. (Glen Ellyn, IL)
Issue Date:
Research Org.:
Argonne National Laboratory (ANL), Argonne, IL
OSTI Identifier:
866744
Patent Number(s):
4778594
Assignee:
University of Chicago (Arch Development Corp.) (Chicago, IL) ANL
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
apparatus; magnetic; separation; paramagnetic; diamagnetic; material; relates; methods; segregating; particles; particulate; particular; gradient; ash; producing; components; pyritic; sulfur; coal; vertical; cylinder; rotatable; screw; positioned; helical; blade; angled; downwardly; outwardly; axis; rotation; causes; denser; migrate; outside; dense; organic; portion; towards; center; vibration; mechanism; attached; vibrate; agitating; accommodating; segregation; field; applied; circumferentially; entire; length; superconducting; quadropole; magnet; segregates; directed; storage; bin; suitable; relatively; clean; combustion; magnetic separation; lean combustion; magnetic particles; entire length; particulate material; magnetic field; magnetic material; pyritic sulfur; organic portion; gradient magnetic; screw position; blade angle; dense particles; magnetic particle; /209/

Citation Formats

Doctor, Richard D. Apparatus for magnetic separation of paramagnetic and diamagnetic material. United States: N. p., 1988. Web.
Doctor, Richard D. Apparatus for magnetic separation of paramagnetic and diamagnetic material. United States.
Doctor, Richard D. Fri . "Apparatus for magnetic separation of paramagnetic and diamagnetic material". United States. https://www.osti.gov/servlets/purl/866744.
@article{osti_866744,
title = {Apparatus for magnetic separation of paramagnetic and diamagnetic material},
author = {Doctor, Richard D.},
abstractNote = {The present invention relates to methods and apparatus for segregating paramagnetic from diamagnetic particles in particulate material and, in particular, to the open gradient magnetic separation of ash producing components and pyritic sulfur from coal. The apparatus includes a vertical cylinder and a rotatable vertical screw positioned within the cylinder, the screw having a helical blade angled downwardly and outwardly from the axis. Rotation of the vertical screw causes denser particles, which in the case of coal include pyritic sulfur and ash, which are paramagnetic, to migrate to the outside of the screw, and less dense particles, such as the low sulfur organic portion of the coal, which are diamagnetic, to migrate towards the center of the screw. A vibration mechanism attached to the screw causes the screw to vibrate during rotation, agitating and thereby accommodating further segregation of the particles. An open gradient magnetic field is applied circumferentially along the entire length of the screw by a superconducting quadropole magnet. The open gradient magnetic field further segregates the paramagnetic particles from the diamagnetic particles. The paramagnetic particles may then be directed from the cylinder into a first storage bin, and the diamagnetic particles, which are suitable for relatively clean combustion, may be directed into a second storage bin.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1988},
month = {1}
}

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