| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a phosphoric acid recovering method capable of efficiently recovering phosphoric acid of high purity, which can be transported in a liquid state of high concentration by a simple constitution and simple operation and is useful as a recovered substance, from phosphoric acid-containing water at a low cost, and a phosphoric acid recovering apparatus. Ž<P>SOLUTION: The phosphoric acid-containing water with a pH of 3 or below and a phosphoric acid concentration of 1-15 wt.% is supplied to a reverse osmosis device 4 equipped with a reverse osmosis membrane 4a with a desalting ratio of 50-90% to be subjected to reverse osmosis treatment and an acid other than phosphoric acid is permeated toward a permeated liquid chamber 4c while phosphoric acid is concentrated on the side of a concentrated liquid chamber 4b. The permeated liquid is desalted to recover pure water 7a and a volatile component is removed from the concentrated liquid along with water to recover a concentrated phosphoric acid liquid 9a. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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