Method for preparing steel additives through waste rare earth materials

Abstract

The invention discloses a method for preparing steel additives through waste rare earth materials. The method is characterized by comprising the following steps that S1, silicon iron, lime, fluorite, graphite, iron and the waste non-alloy rare earth materials are added into an electric-arc furnace, stibnite and / or bismuthinite are added into the electric-arc furnace, and the electric-arc furnace is electrified for smelting; S2, residues inside the furnace are poured out, one or more of ferrotitanium, ferroboron and waste alloy rare earth materials are added into the electric-arc furnace, nitrogen is introduced, and stirring is conducted; and S3, cooling is conducted, and the finished steel additives are obtained. Compared with the prior art, the method for preparing the steel additives through the waste rare earth materials has the advantages that environmental friendliness is achieved, energy is saved, the steel additives can be produced by directly recycling the waste rare earth materials, and secondary pollution is avoided.

Description

technical field [0001] The invention belongs to the field of mineral resource recovery and utilization, and in particular relates to a method for preparing iron and steel additives by using rare earth waste. Background technique [0002] Rare earth materials are widely used in national defense and military industry, aerospace, computer, electronic industry, medical equipment and other fields due to their superior performance and excellent cost performance; waste will be generated during the processing and use of rare earth materials, such as the production of rare earth permanent magnet devices The powder produced during the cutting and grinding process, a small amount of unqualified NdFeB magnets in the production process, the used polishing powder, and the discarded rare earth fluoride produced by electrolysis are collectively referred to as rare earth waste and rare earth waste. The composition is the same as that of the rare earth material, mainly composed of rare earth....

AI Technical Summary

Problems solved by technology

But at present, there are mainly two ways to add antimony and bismuth, one is to directly add metal antimony or metal bismuth to molten iron when producing cast iron, and the other is to use metal antimony or metal bismuth as raw materials for the production of nodularizers and add them to the Nodulizer, and then added to cast iron, these two addition methods are metal antimony or metal bismuth, the price is more expensive