PROCESSING METHOD OF MICRO PRODUCTION WASTES OF CONSTANT MAGNETS Russian patent published in 2012 - IPC C22B59/00 C22B7/00 C22B3/06 C22B5/04 

FIELD: metallurgy.

SUBSTANCE: method involves oxidation of micro production wastes at temperature of 550-650°C in air atmosphere for destruction of crystal latitude Nd₂Fe₁₄B so that Fe₂O₃, Nd₂O₃, Fe₂B is formed and moisture and oil is removed. Then, anhydrous fluorides of rare-earth metals are obtained and their metallothermic reduction is performed for production of constant magnets. After oxidation from oxidated microwastes is completed, rare-earth metals are leached with nitric acid with concentration of 1-2 mol/l at temperature of 20-80°C. Obtained nitrate solutions containing rare-earth metals and impurity elements are processed with solution of formic acid with extraction of formiates of rare-earth metals in the form of the deposit cleaned from impurity elements, which includes iron, aluminium, nickel, cobalt, copper and other transition metals.

EFFECT: regeneration of rare-earth metals from production wastes of magnets and obtaining raw material containing rare-earth metals for reutilisation in production of rare-earth constant magnets.

2 cl, 2 tbl, 7 ex