Abstract
The boric acid contained in bittern is absorbed in magnesium hydroxide that is precipitated from the bittern.
The present investigation was performed with particular emphasis on the various conditions of this reaction in order to utilize boric acid in bittern. The experimental results are as follows:
(1) The pH value has a remarkable effect on the absorption. When the pH was below 11, rate of absorption was high, and when its range was from.11 to 12, it was low. When the pH was above 12, absorption did not occur.
(2) The relationship between the amount of absorbed boric acid and its degree of concentration agreed with Freundlich's absorption isotherm.
(3) The effect of temperature was not so remarkable.
From the foregoing, it can be concluded that this reaction is applicable to the collection of boric acid from bittern or the production of magnesium hydroxide containing boric acid.
