Synthesis and Application of Urea-Formaldehyde for Manufacturing a Controlled-Release Potassium Fertilizer

• Published in: Industrial & engineering chemistry research Vol. 57; no. 5; pp. 1593 - 1606
• Main Authors: Guo, Yanle, Liu, Zhiguang, Zhang, Min, Tian, Xiaofei, Chen, Jianqiu, Sun, Lingli
• Format: Journal Article
• Language: English
• Published: American Chemical Society 07.02.2018
• ISSN: 0888-5885; 1520-5045
• DOI: 10.1021/acs.iecr.7b04629

Few studies have paid attention to high-concentration controlled release potassium (CRK) fertilizer because conventional potassium chloride (KCl) particles with the characteristics of irregular, high specific surface area, and bad fluidity are generally unsuitable to produce controlled-release fertilizer. The objective of this study was to investigate the interacting effects of urea-formaldehyde and additives on KCl granulation. In addition, the controlled-release characteristics of CRK based on modified KCl particles were determined in our research. Results indicated that 4–8% urea-formaldehyde combined with 6–8% bentonite was used as a double binder to increase the granulation rate, smoothness, and particle hardness of KCl granules, which enhanced its characteristics for the coating process. The K release rates of modified KCl particle-based CRK were significantly lower than that of the conventional KCl particle. In conclusion, the novel KCl granulation technology has an enormous potential for large-scale applications to satisfy the increasing demand for CRK fertilizers in the future.