Method for electrolytically extracting rare earth through liquid cathode molten salt and preparing lead rare earth alloy

Abstract

The invention discloses a method for electrolytically extracting rare earth through liquid cathode molten salt and preparing lead rare earth alloy, and belongs to the technical field of nuclear fuel reprocessing. According to the technical scheme, lithium chloride, potassium chloride, and rare earth chloride are put into an alumina crucible, a mixture is subjected to temperature rise and is meltedto molten salt, a small crucible containing a lead ingot is put into the alumina crucible, and heat preservation is carried out; a cathode, a reference electrode and an auxiliary electrode are inserted into the molten salt to be connected with an electrochemical workstation; electrochemical workstation cyclic voltamogram and timing potential are used for measuring rare-earth reduction peak potential and alloy forming current; according to the reduction peak potential of the rare earth on the liquid-state lead electrode and the forming current of the lead rare earth alloy, constant potential electrolysis and constant current electrolysis are carried out for extracting the rare earth; the small crucible is cooled under the argon protection, an electrolysate is taken out, ethyl alcohol and deionized water are used for flushing, low-temperature drying is carried out, and the lead rare earth alloy is obtained. Compared with a method for extruding the rare earth through a solid electrode and obtaining the lead rare earth alloy, the method is short in flow process, and high in extraction rate, and the rare earth extraction rate is up to 97.2%.

Description

technical field [0001] The invention belongs to the technical field of post-processing of nuclear fuel, and in particular relates to a method for electrolytically extracting rare earths from liquid cathode molten salts and preparing lead rare earth alloys. Background technique [0002] In the context of the country's vigorous development of nuclear power technology, the pressure and challenges of spent fuel reprocessing are unprecedentedly huge, and it has become one of the key factors for the safe, efficient and sustainable development of nuclear energy in my country. With the development of nuclear power, the amount of spent fuel produced continues to increase, and is expected to reach 1 million tons by 2050. The uranium and plutonium extracted from spent fuel is enough to fuel 140 1GWe light water reactors for 60 years. With the advancement of reactor technology and the improvement of nuclear energy economic requirements, nuclear fuel burnup will further increase. The c...

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Problems solved by technology

So far, there have been no reports on the patents related to the electrolytic extraction of rare earths from liquid lead cathode molten salts at home and abroad. In the patent CN107794551A, a copper-dysprosium master alloy prepared by molten salt electrolytic co-deposition and its preparation method are proposed, but its electrolysis temperature is 940 The burning loss of energy consumption at 980°C is large, and dysprosium in the obtained alloy is not easy to separate from copper

In the CN104775137A patent, a method for preparing an aluminum-samarium master alloy by liquid cathode molten salt electrolysis is proposed. The electrolysis temperature is 750-900°C, and the energy consumption is relatively large.

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