| 摘要 |
PURPOSE:To treat the reverse extracting medium at a high effectivenss of crystallization recovery by providing the means of sending back the reverse extracting medium to the reverse extraction means again, and also providing means of circulating the said reverse extracting medium as it is in the reverse extraction means after sending the reverse extracting medium, which is reversely extracted from the extracting substance and degree of supersaturation of which is raised up, to the means of crystallization for carrying out crystallization. CONSTITUTION:The means of circulation of reverse extracting medium is constituted by the pipings 84 having the pump 82 for sending the reverse extracting medium from the outlet 50 of the extraction means 1, to the pit 3 and the pipings 86 for circulating the reverse extracting medium from the pit 3 to the inlet 84 of the extraction means 1. The said reverse extracting medium is extracted out of the means of circulation by the pipings 90 having the pipings 88 and the pump 92 for extracting the reverse extracting medium out of the pit 3 and sending the same to the inlet 54 of the means of crystallization 2 through the means of degree of supersaturation 4 and also by the pipings 94 sending the extracted drain out of the outlet 56 of the means of crystallization 2 to the pit 3 and the degree of supersaturation of the reverse extracting medium is raised. Then, the treatment of crystallization is carried out to enable the reverse extracting medium to be back.
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