CRYSTALLIZATION AND SEPARATION DEVICE

摘要

PROBLEM TO BE SOLVED: To realize cooling crystallization and solid/liquid separation of nitric acid solution simultaneously and continuously in a short time and drastically reduce the process of cooling crystallization and solid/ liquid separation. SOLUTION: At the lower end and upper end of a rotary vessel having a swelling part 14 at the lower part and capable of storing nitric acid solution inside, a lower shaft 12 and an upper shaft 13 are connected. A rotary shaft 16 inserted vertically downward in the rotary vessel 11 from a shaft penetration hole 13a formed in the upper shaft rotates in the same direction as the rotation direction of the rotary vessel 11 with a different rotation speed for a specific speed from that of the rotary vessel 11. Inside the surrounding wall forming the swelling part 14, formed is a cooling liquid path 17 wherein cooling liquid 30 crystallizing nitric acid compound crystal 21a by cooling the nitric acid solution in the rotary vessel 11 can pass. A scraper 18 fixed in spiral on the outer surface of the rotary shaft 16 carries upward the nitric acid compound crystal piled on the surrounding wall surface of the swelling part 14 and this crystal is exhausted out of the crystal outlet 13b formed at the lower end of the upper shaft 13.