Showing papers by "Baohong Hou published in 2008"

Habit modifier and method for modifying ammonia sulfate crystal habit

Abstract: The invention discloses a method for carrying out control to the crystal habit of ammonium sulphate crystal by adopting a habit modifier so as to obtain the ammonium sulphate crystal with different crystal habits. The method comprises the following steps: the ammonium sulphate and water are mixed according to the mass portion of 60-85 : 100; 800-1300ppm metallic cation or the dibasic acid habit modifier is added; the solution is heated to 40-50 DEG C; a cooling crystallizing method is adopted, the cooling rate is 8-12 DEG C/h and the temperature is reduced to 8-15 DEG C, thus obtaining the ammonium sulphate crystal with the unique crystal habit under corresponding conditions, which is shown in the attached diagram. The invention provides different methods for preparing the ammonium sulphate crystal with different crystal habits by using different habit modifiers, and the ammonium sulphate crystal has unique crystal habit and high product purity and can be used as raw materials in the fermentation process of certain drugs; the ammonium sulphate crystal prepared by utilizing the dibasic acid as the habit modifier is applicable to producing aggregation ammonium sulphate products with the granularity being more than 2.3mm, and can improve using efficacy as fertilizer.