High-temperature molten salt electrolysis rare earth metal slotting device and method

Abstract

A high-temperature molten salt electrolysis rare earth metal bath discharge device comprises a vacuum liquid storage bag with a metal liquid outlet, wherein the vacuum liquid storage bag is tightly fixed on a turn type lifting platform car, one end of the vacuum liquid storage bag is communicated with a siphon inserted into a molten salt electrolysis bath, the other end of the vacuum liquid storage bag is communicated with a vacuum buffer tank through a metal corrugated pipe, the vacuum buffer tank is connected with a vacuum pump, the invention further provides a method using the high-temperature molten salt electrolysis rare earth metal bath discharge device, the siphon principle is used in the invention, the molten metal liquid is sucked into the vacuum liquid storage bag, then a plurality of moulds are cast, so that the bath discharge time is shortened, the loss of heat of a bath body is reduced, the fluctuation of the condition of the bath is avoided, the defects of high labor strength and poor operating environment and the like are overcome, the production cost is lowered, the product quality is improved, the stability is good, the metal liquid is guaranteed to go smoothly from the electrolysis bath to casting to moulding, and the problem of the hardly acceptable difficulties in taking out the rare earth metal and sealing a casting chamber after the casting on the site is also avoided.

Description

Technical field [0001] The invention belongs to the technical field of rare earth metal metallurgy, and in particular relates to a high-temperature molten salt electrolytic rare earth metal extraction device and method, which are used for the industrial production of a large-scale fluoride molten salt system oxide rare earth electrolytic cell. Background technique [0002] Due to the unique properties of rare earth elements and the natural abundance of rare earths in my country, my country has developed into the world's largest producer, consumer and exporter of rare earth metals. Molten salt electrolysis is the most important industrial method for producing single light rare earth metals, mixed rare earth metals and rare earth alloys. With the continuous development and growth of my country's rare earth metal industry, fluoride molten salt system oxide electrolysis process (referred to as oxide electrolysis process) has become the mainstream production process, and the current e...

AI Technical Summary

Problems solved by technology

But there are problems: (1) It is very easy for rare earth metals to condense on the siphon tube and the inlet port to block, which is extremely difficult to clean, which is related to the shape, length and no insulation measures of the siphon tube

(2) When the molten metal enters the vacuum furnace bag, it is impossible to determine when the siphon is completed and the siphon operation is stopped

(3) During the whole process of the furnace, the heat of the vacuum furnace diffuses quickly, and it needs to be repeatedly opened and sealed, which makes the operation difficult and labor-intensive

(4) The method proposed by Shedd ES and Goldsmith JR in the United States to siphon the embedded molybdenum lead-out tube after electric heating and boron nitride siphon tube siphon, but when there is a tank, it needs to be in a sealed system and under the protection of argon gas, which is only suitable for low The production process of rare earth metals at melting point and siphon tubes is complex and costly, and it is easy to cause metal blockage of pipes or sudden cooling and sudden heating of straws. The actual production of large-scale rare earth electrolysis under the open system in my country

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