| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and an apparatus for stably performing a efficient growth of fine crystalline particles produced in crystallization vessels and the removal of irons such as the dephosphorization through a long period by using the grown crystalline particles as the seed crystals. SOLUTION: In the method of removing the ions to be removed in water to be treated by crystallization method, the crystallizing method is performed by supplying the water to be treated to each of >=2 kinds of the crystallization vessels, supplying air to each of the 2nd and the succeeding crystallization vessels, crystallization hardly soluble salts with the ions to be removed in the water to be treated in the 1st crystallization vessel, solid-liquid separating into the hardly soluble salts and treated water, introducing the fine hardly soluble salt particles after the solid-liquid separation into the 2nd and the succeeding crystallization vessels, crystallization the ions to be removed in the water to be treated on the surface of the fine hardly soluble salt particles to grow the particles and after returning the grown particles to the 1st crystallization vessel to further grow the returned particles in the 1st recystallization vessel, drawing out as the product crystals. The apparatus for the same is provided.
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