Method for preparing composite nitrogen fertilizer by utilizing guanidinoacetic acid production waste liquid and application of composite nitrogen fertilizer

The invention belongs to the field of organic fertilizers, and discloses a method for preparing a composite nitrogen fertilizer from guanidinoacetic acid production waste liquid and application of the composite nitrogen fertilizer. The method comprises the following steps: evaporating and concentrating the guanidinoacetic acid production waste liquid, adjusting the pH value, mixing the guanidinoacetic acid production waste liquid with humic acid and a mineral fertilizer, drying, and mixing with an amide nitrogen fertilizer or an ammonium nitrogen fertilizer to prepare the composite nitrogen fertilizer. The compound nitrogen fertilizer is prepared by recycling the guanidinoacetic acid production waste liquid, resource waste is effectively reduced, and the method is widely applied to the chemical fertilizer production and processing industry. 本发明属于有机肥领域，公开了一种利用胍基乙酸生产废液制备复合氮肥的方法及其应用。该方法是通过将胍基乙酸生产废液蒸发浓缩并调节pH后，与腐殖酸和矿物质肥料混合，干燥后与酰胺态氮肥或铵态氮肥混合制得复合氮肥，本发明制得的复合氮肥能够与磷和钾配制成复合肥使用。本发明通过将胍基乙酸生产废液回收再利用制备复合氮肥，有效降低了资源浪费，本发明广泛适用于