US 12,304,877 B1
Preparation method of composite slow-release nano-nitrogen fertilizer
Xiangyang Hou, Taiyuan (CN); Guohua Ren, Taiyuan (CN); Lixia Du, Taiyuan (CN); Caixia Wang, Taiyuan (CN); and Liyuan Cui, Taiyuan (CN)
Assigned to Shanxi Agricultural University, Taiyuan (CN)
Filed by Shanxi Agricultural University, Taiyuan (CN)
Filed on Dec. 3, 2024, as Appl. No. 18/966,734.
Claims priority of application No. 202410716870.2 (CN), filed on Jun. 4, 2024.
Int. Cl. C05G 5/40 (2020.01); C05C 9/00 (2006.01); C05F 11/02 (2006.01); C05G 3/40 (2020.01)
CPC C05G 3/40 (2020.02) [C05C 9/005 (2013.01); C05F 11/02 (2013.01); C05G 5/40 (2020.02)] 7 Claims
 
1. A preparation method of a composite slow-release nano-nitrogen fertilizer, comprising the following steps:
step S1, sieving cellulose and nanoclay and adding into water and stirring to allow a reaction to obtain a mixture, subjecting the mixture to solid-liquid separation, and then subjecting an obtained solid to drying, crushing, and sieving in sequence to obtain a solid sample a1;
step S2, subjecting the solid sample a1 to pyrolysis at a pyrolysis temperature of 500° C. to 800° C. for 2 h to 3 h under a nitrogen atmosphere, and then cooling an obtained product to a room temperature to obtain a solid sample a2;
step S3, sieving humic acid and the nanoclay and adding into water and stirring to allow a reaction to obtain a mixture, subjecting the mixture to solid-liquid separation, and then subjecting an obtained solid to drying, crushing, and sieving in sequence to obtain a solid sample b2; and
step S4, subjecting the solid sample a2, the solid sample b2, and urea to melt-blending, and then subjecting an obtained mixture to washing with anhydrous ethanol, drying, and crushing in sequence to obtain the composite slow-release nano-nitrogen fertilizer.