Yttrium-containing misch metal, rare earth hydrogen storage alloy and preparation method of yttrium-containing misch metal and rare earth hydrogen storage alloy

Abstract

The invention discloses yttrium-containing misch metal, rare earth hydrogen storage alloy and a preparation method of the yttrium-containing misch metal and the rare earth hydrogen storage alloy, andrelates to the technical field of rare earth alloy. The preparation method of the yttrium-containing misch metal comprises the following steps that electrolyzing is carried out by using an electrolytecontaining mixed rare earth fluoride, and mixed rear earth oxide is added in the electrolysis process; and the mixed rare earth fluoride comprises YF<3> and other rare earth fluoride, the mixed rareearth oxide comprises Y<2>O<3> and other rare earth oxide, and other rare earth is selected from at least one of lanthanum (La) and cerium (Ce). According to the preparation method of the rare earth hydrogen storage alloy, the rare earth hydrogen storage alloy is prepared from the yttrium-containing misch metal prepared by the above preparation method, and compared with preparation by smelting single misch metal, the electrochemical performance and the hydrogen absorption and desorption performance of the preparation method of the rare earth hydrogen storage alloy are not reduced, but the preparation cost is remarkably reduced.

Description

technical field [0001] The invention relates to the technical field of rare earth alloys, and in particular to a mixed rare earth metal containing yttrium, a rare earth hydrogen storage alloy and a preparation method thereof. Background technique [0002] The abundances of lanthanum (La), cerium (Ce) and yttrium (Y) in the earth's crust are 32ppm, 46ppm and 30ppm, respectively, which belong to high-abundance rare earth elements. At present, the excessive use of rare earth elements such as praseodymium, neodymium, dysprosium, and terbium has caused a large backlog of high-abundance rare earth elements lanthanum, cerium, and yttrium. It is of great significance to develop the application of lanthanum, cerium, and yttrium. [0003] The anode materials that have been commercialized on Ni-MH batteries are mainly AB 5 and A with Mg 2 B 7 Type rare earth hydrogen storage alloy, A in the alloy is mainly a mixed light rare earth metal rich in lanthanum or rich in lanthanum and cer...

AI Technical Summary

Problems solved by technology

The melting point of metal yttrium is as high as 1522°C. It is currently prepared by calcithermic reduction process, which is not suitable for molten salt electrolysis.

The calcithermal reduction process is intermittent production, high energy consumption, large production waste residue, high impurity content of the product needs further purification, low metal recovery rate, thus resulting in high production cost of metal yttrium

Therefore, although the price of yttrium oxide is low in the market (less than 20,000 yuan / ton), the price of metal yttrium is relatively expensive (230,000 yuan / ton).

The melting points of these three metals are quite different, especially metal yttrium with a melting point as high as 1522°C leads to a higher melting temperature, which makes it difficult to control the composition of rare earth hydrogen storage alloys, and the alloy yield is nearly 1% lower than that of yttrium-free alloys; at the same time, metal yttrium High price leads to high production cost of hydrogen storage alloys, which limits the application of yttrium in hydrogen storage alloys to a certain extent

[0006] In view of the current high production cost of rare earth metal yttrium, this application is proposed

Images