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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 quadrupole 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. 5 figs.« less

Inventors:
Issue Date:
OSTI Identifier:
7024778
Patent Number(s):
4778594
Application Number:
PPN: US 6-889131
Assignee:
Univ. of Chicago, IL (United States)
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Patent
Resource Relation:
Patent File Date: 24 Jul 1986
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; COAL; DEASHING; DESULFURIZATION; MAGNETIC SEPARATORS; DESIGN; COAL PREPARATION; DENSITY; DIAMAGNETISM; OPERATION; PARAMAGNETISM; PYRITE; SUPERCONDUCTING MAGNETS; CARBONACEOUS MATERIALS; CHEMICAL REACTIONS; CONCENTRATORS; ELECTRICAL EQUIPMENT; ELECTROMAGNETS; ENERGY SOURCES; EQUIPMENT; FOSSIL FUELS; FUELS; MAGNETISM; MAGNETS; MATERIALS; MINERALS; PHYSICAL PROPERTIES; SULFIDE MINERALS; SUPERCONDUCTING DEVICES; 010300* - Coal, Lignite, & Peat- Preparation- (1987-)

Citation Formats

Doctor, R D. Apparatus for magnetic separation of paramagnetic and diamagnetic material. United States: N. p., 1988. Web.
Doctor, R D. Apparatus for magnetic separation of paramagnetic and diamagnetic material. United States.
Doctor, R D. Tue . "Apparatus for magnetic separation of paramagnetic and diamagnetic material". United States.
@article{osti_7024778,
title = {Apparatus for magnetic separation of paramagnetic and diamagnetic material},
author = {Doctor, R 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 quadrupole 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. 5 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1988},
month = {10}
}