Method and apparatus for removing dust and debris from particulate product
OwnerJerome I. Paulsoninventor
Life of this patent
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Abstract
The impurity laden particulate material to be cleaned by a gravity feed deduster is passed through a magnetic field of varying intensity to neutralize the static charge causing the impurities to adhere to the primary product. The material is then subjected to air flows to separate the neutralized debris from the primary product. The air flows can be of high velocity and can be either pressurized air or vacuum induced. The cleaned product is collected and the contaminated air is treated to recover the debris therefrom.
Claims20
A dedusting device for separating dust and similar unwanted debris adhering to particular product and entrained therewith, said dedusting device having at least one chamber defining a substantially vertical feed path through which said particulate product free falls by gravity, at least one coil surrounding an entry end of said chambers and adapted to generate a magnetic field for neutralizing the static electricity charge causing the debris to adhere to the primary product and at least one cleaning chamber having means for subjecting said product to an air flow to cause the neutralized debris to separate from the heavier product, characterized by means for varying the level and intensity of said magnetic field whereby the static charge of the debris is more effectively neutralized.
An apparatus for effectively removing unwanted debris adhering to particulate product while said product is being conveyed through a transport system, said apparatus comprising:
- a closed housing in a portion of said transport system between a product inlet means and a cleaned product collector, said housing having an inlet and an outlet and defining a feed path for said product, at least part of said path including product free fall under the influence of gravity;
- at least one flux field generating coil surrounding said free fall part of said path and subjecting product passing therethrough to a magnetic field of varying level and intensity which field neutralizes charges of debris passing therethrough;
- at least one airwash deck receiving said product and subjecting it to a transverse flow of clean air of sufficient magnitude to separate to magnetically neutralized debris from the product;
- and
- filter means connected to receive debris laden air coming from said airwash deck and collect the debris therefrom.
A method for cleaning particulate product to separate debris therefrom comprising the steps of:
- passing debris contaminated product in free fall through a flux field of varying intensity to neutralize the static electrical charge causing the debris too adhere to said product;
- subjecting the neutralized product to at least one air flow to drive off the neutralized debris which is lighter than the primary product;
- and
- separately collecting the cleaned product and debris.
Dependencies are inferred from the claim text.