| 摘要 |
PURPOSE:To perform granulation using crude inorg. salts, by adding a pH controller to a water-soluble inorg. salt powder and a binder in a amount setting the pH of an aqueous solution after granulation to 5-9 and subsequently kneading, molding and granulating the resulting composition. CONSTITUTION:A water-soluble inorg. salt powder, a binder and a pH controller setting the pH of a solution prepared by dissolving a granule in water to 5-9 are compounded and the resulting composition is kneaded in a horizontal mixer having two rotary stirring shafts and molded to prepare the granule. As the water soluble salts, there are a water-soluble alkali metal salt, a water-soluble alkali earth metal salt or the like and one imparting pH 5-9 when it is dissolved in water is pref. As the pH controller, sodium hydroxide, potassium hydroxide or the like are pref. Further, the pH controller is pref. preliminarily added to the inorg. salts before the binder is added.
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