Energy-saving roasting method of mixed rare earth wastes

Abstract

The invention relates to the field of roasting of rare earth wastes, and specifically provides an energy-saving roasting method of mixed rare earth wastes. The method is characterized in that individual roasting of the rare earth wastes is replaced by mixed roasting of the rare earth wastes, and moreover, coal is not added during the roasting process; the mixed rare earth wastes include the following components including 20 parts of oil, 20 parts of chamfering mud, 10 parts of ultrafine powder or slag, and 40 parts of a water milling material. According to the technical scheme, the ultrafine powder and the slag are not roasted at the same time, and must be subject to matched roasting alternatively. The method has the characteristics of being high in adaptability, outstanding in effect, high in technicality, high in economic benefit, energy-saving and the like in the production process; a plurality of shortages, such as large flame, the poor effect, instability, the high reworking rateand the like, in single roasting of the rare earth wastes can be overcome; the fire coal does not need to be added during the roasting process, the energy saving effect is achieved, and the roasting cost is saved, and as a result, the economic benefit is high, and the production demand is met.

Description

technical field [0001] The invention relates to the field of rare earth waste roasting, in particular to an energy-saving roasting method for mixed rare earth waste. Background technique [0002] NdFeB is a magnetic material widely used in various fields. Due to the requirements of the production process, about 20-25% of waste materials are produced during the production and use of NdFeB materials, and about 32% of rare earth elements are contained in NdFeB materials. NdFeB waste materials include oil sludge and scraps , slag, ultrafine powder, water abrasive, etc., which contain 20-40% of rare earth elements, and the rest is mostly iron. Recycling it not only makes rational use of resources, but also reduces environmental pollution. [0003] In the prior art, the rare earth waste roasting production process generally adopts a single waste roasting method. Some pyrotechnics exist in this method, some pyrotechnics are small, and some need to add coal, the effect is also po...

AI Technical Summary

Problems solved by technology

Roasting costs are high and not energy-saving and environmentally friendly