Nitrogen circulation low-temperature rectification crude argon purification and liquefaction device and use method thereof

The invention relates to a nitrogen circulation low-temperature rectification crude argon purification and liquefaction device and a use method thereof, the nitrogen circulation low-temperature rectification crude argon purification and liquefaction device comprises a raw material crude argon compressor, a circulation nitrogen compressor, a high-low temperature expansion machine refrigeration system and a cold box system, the front of the raw material crude argon compressor is connected with a raw material crude argon pipe network, and the cold box system is arranged behind the raw material crude argon compressor; one end of the cold box system is connected with the high-low temperature expansion machine refrigeration system, and the other end of the cold box system is connected with the circulating nitrogen compressor. The nitrogen circulating low-temperature rectification crude argon purification and liquefaction device for extracting and liquefying argon from low-purity crude argon can extract liquid argon