Method for recycling used or waste permanent magnets
AssigneeCaremag
InventorDavid Bengio
Life of this patent
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Abstract
This method of recycling used or waste permanent magnets and scrap from the production of such magnets, consists, after having demagnetized said permanent magnets and having reduced them to a powder, in completely oxidizing the latter, and then in submitting the product resulting from this oxidation to a dissolving and finally to a filtering. The oxidation is carried out in two consecutive sub-steps: a first sub-step of partial oxidation at a temperature of no more than 500° C.; and then a second sub-step of complete oxidation at higher temperature, and in particular at a temperature of between 60° and 800° C.
Claims15
A method of recycling used or waste permanent magnets and scrap from the production of such magnets, consisting, after having demagnetized said permanent magnets and having reduced them to a powder, in completely oxidizing the latter, and then submitting the product resulting from this oxidation to a dissolving and finally to a filtering, wherein the oxidation is carried out in two consecutive sub-steps:
- a first sub-step of partial oxidation at a temperature of no more than 500° C.;
- and then a second sub-step of complete oxidation at a temperature of between 60° and 800° C.
Dependencies are inferred from the claim text.