A method for preparing aluminum-based rare earth alloys by electrolysis near room temperature

Abstract

The invention belongs to the field of low-temperature electrochemical extraction and particularly relates to a method for preparing an aluminum-based rare earth alloy through near-room-temperature electrolysis. The method for preparing the aluminum-based rare earth alloy through near-room-temperature electrolysis is an electrolytic method, and a electrolyte adopted by the electrolytic method is formed by rare earth chloride and ionic liquid, wherein the ionic liquid accounts for 96-98% of the total mass of the electrolyte, the rare earth chloride accounts for 2-4% of the total mass, and the rare earth chloride is one of neodymium chloride, lanthanum chloride, cerium chloride, scandium chloride, yttrium chloride, praseodymium chloride, samarium chloride, europium chloride, gadolinium chloride and terbium chloride. According to the technological for preparing the aluminum-based rare earth alloy through near-room-temperature electrolysis, operation is easy, and cost is low; and the technological reserve and theoretical support are provided for green extraction of the low-cost aluminum-based rare earth alloy.

Description

technical field [0001] The invention belongs to the field of low-temperature electrochemical extraction, and in particular relates to a method for electrolytically preparing aluminum-based rare earth alloys in a near room temperature environment. Background technique [0002] Adding an appropriate amount of rare earth elements to aluminum alloy can promote the refining of aluminum. Rare earth elements can improve the shape of inclusions and purify grain boundaries. Adding 1.5-2.5% rare earth elements to aluminum alloy can improve the high temperature performance, air tightness and corrosion resistance of the alloy, and it is widely used as aerospace materials. With the development of science and technology and the expansion and extension of the field of rare earth technology, rare earth elements will have a wider space for utilization. [0003] The current production of aluminum-based rare earth alloys includes (1) pairing method; according to the alloy composition require...

AI Technical Summary

Problems solved by technology

However, conventional ionic liquids are difficult to use in the electrodeposition of rare earths, because the electrochemical window of conventional ionic liquids cannot meet the requirements of the deposition potential of rare earth elements, and the ionic liquid decomposes and deteriorates before the deposition potential of rare earth metals and is difficult to recover.

A small number of ionic liquids such as [P 2225 ][TFSA],[N 2225 ][TFSA], etc. can deposit rare earth elements, but the synthesis process for preparing this ionic liquid is complex, the exchange reaction is not complete, and the obtained product needs multi-step purification and separation, and the raw material rare earth salt used is an organic salt RE(TFSA) 3 , significantly increased cost, no application advantage

Images