Recently, studies were made on magnesium hydroxide which contains boric acid, as a raw material for magnesia clinker.
This investigation was performed following its production through absorption of boric acid to magnesium hydroxide previously studied by the same authors.
The magnesium hydroxide was precipitated from magnesium chloride solution with sodium hydroxide or calcium hydroxide, and mixed with the boric acid solution after sufficient washing.
The experimental results were as follows:
(1) The amounts and rate of absorption were remarkably effected by the conditions of magnesium hydroxide. The magnesium hydroxide which was freshly precipitated and kept in wet condition absorbed strongly, while that which was exposed to air absorbed weakly.
(2) The relation between the amount of absorbed boric acid and the concentration of boric acid solution showed agreement with Freundlich's absorption isotherm. From these results, a convenient diagram was made for producing magnesium hydroxide containing the requested amounts of boric acid, and magnesium hydroxides containing 0.5-5% of boric acid were made by use of this diagram.
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