| 摘要 |
PURPOSE:To separate stripped products efficiently from liquid suspension without injection a chemical by allowing crystal seed to contact with water contg. phosphate again and supplying the aq. suspension contg. the stripped product to a porous tube filter to concentrate and separate the stripped product. CONSTITUTION:Water contg. phosphate is allowed to contact with crystal seeds contg. calcium phosphate compd. at >=6pH in the presence of Ca ion to perform dephosphorization. In this case, the surface layer of deposited crystal seeds is stripped and reactivated so as to expose a crystalline apatite layer deposited on the surface of the crystal seeds and the crystal seeds are allowed to contact again with water contg. phosphate. On one hand, the aq. suspension contg. the stripped product is fed to a porous tube filter to concentrate and separate the stripped product. It is preferable that the surface layer is >=50% of the deposited part when the surface layer of the deposited product of the crystal seeds is stripped off.
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