腐植酸及其盐对磷酸二铵着色的实验研究

以湿法磷酸和腐植酸及其盐类为原料,并以美国嘉吉公司棕褐色磷酸二铵(DAP)产品为参照,按照传统法生产DAP的工艺条件进行着色评价实验。先后研究了不同类别的腐植酸及其盐在浓磷酸、洗涤液和水中的溶解性能;进行不同着色剂种类、用量条件下磷酸通氨中和反应实验,并在此基础上进行喷浆造粒实验。研究表明:腐植酸类着色剂在DAP生产系统中的适宜添加方式为先将其配制为10%的水溶液,然后再添加到磷酸或洗涤液中;0.15%用量的ESM-1着色剂产品效果最佳,其颜色最接近美国嘉吉公司的棕褐色DAP产品;添加ESM-1型着色剂对产品养分的影响不大。

Experimental Study on Dyeing Diammonium Phosphate with Humic Acid and Its Salt

We take the wet process phosphoric acid、humic acid and its salts as raw materials,take the american jiajie diammonium phosphate products as reference,and do the dyeing evaluation experiment according to the process conditions of the traditional method of production of diammonium phosphate. This experiment has studied the different types of humic acid and its salts' s solubleness in concentrated phosphoric acid,washing liquid and water resistance; did the ammonia neutralization reaction experiment under the condition of different varieties and amount of the colorant. Based on these experiments,we have finished the spray granulation experiments. Experimental study showed that the suitable adding method of the humic acid colorant in the ammonium phosphate production system is that it is formulated in the 10% concentration of aqueous solution,then adding to the phosphate or washing liquid; the product of 0. 15% dosage of the ESM-1 colorant is the best,and it's color is mostly closed to the american jiajie diammonium phosphate products,adding the ESM- 1 type colorant doesn't impact it's product nutrient,and we can get superior diammonium phosphate product.