The invention discloses an
impurity removal method of oil-based
neodymium iron
boron oil sludge wastes, and belongs to the technical field of recycling of
rare earth permanent magnetic materials. Aiming at the problems of high content of carbon,
hydrogen and
oxygen, fine powders, extremely easy agglomeration of the powders and the like in oil-based
slicing oil sludge wastes, an
organic solvent, aninorganic
solvent, a surfactant and an acid solution are used for cleaning the inorganic impurities
oil sludge wastes, organic impurities, oxides and inorganic impurities in the oil
sludge are removed by combining an ultrasonic and
magnetic separation method, and regenerated
neodymium iron
boron powders which are low in carbon,
hydrogen and
oxygen content, good in performance and relatively highin purity are obtained. The method has the significant characteristics and advantages that, 1) the process is short, and the oil
sludge is used as raw materials to directly obtain the regenerated
neodymium iron
boron powders; 2), the efficiency is high, and the performance of the regenerated powders is good, and the purity of the regenerated powders is relatively high; 3) the cost is low, and theconsumed energy in the process flow is less and the used raw materials and reagents are easy to obtain; and 4) the process is simple and easy to operate, and the
repeatability is good.