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为了尽可能降低甚至消除尿素基大量元素水溶性肥料中的水不溶物,对不同条件下制备的大量元素水溶肥以及其中的水不溶物进行研究。结果表明,在较高温度下制备的水溶肥样品,其pH值和水不溶物含量要明显高于较低温度下制备样品;X射线衍射分析结果显示,两种温度下制备的水溶肥样品的衍射图也出现了一些差别。根据分析结果,提出水不溶物的形成机制为:在较高温度下制备样品时,尿素缩合反应产生的氨气被吸收,使体系的p H值升高,升高的pH值以及高温的共同作用导致了水溶肥中的部分微量元素络合物中的金属离子参与磷酸盐的固相沉淀反应,导致水不溶物含量升高。
In order to reduce or even eliminate the water-insoluble matter in urea-based water-soluble fertilizer, the water-soluble fertilizer and the water-insoluble substance were prepared under different conditions. The results showed that the water-soluble fertilizer prepared at higher temperature had higher pH value and water-insoluble content than those prepared at lower temperature. The results of X-ray diffraction showed that water-soluble fertilizer prepared at two temperatures There are also some differences in the diffraction pattern. According to the analysis results, it is proposed that the formation mechanism of water insoluble matter is that when the sample is prepared at a higher temperature, the ammonia gas generated by the urea condensation reaction is absorbed, the pH of the system is increased, the pH value is elevated, and the high temperature is common As a result, the metal ions in some trace element complexes in the water-soluble fertilizer are involved in the solid-phase precipitation reaction of the phosphate, resulting in the increase of the water-insoluble content.