复混肥生产装置改产脲甲醛缓释复合肥料的技术

利用转鼓蒸汽造粒或圆盘造粒复混肥生产装置改造并开发生产脲甲醛缓释复合肥。介绍脲甲醛的生产原理、反应条件控制和脲甲醛缓释复合肥的生产过程。尿素熔融喷浆工艺的转鼓蒸汽造粒复混肥装置改产脲甲醛缓释复合肥具有投资少、工期短、生产成本低于包膜控释肥等优点。该肥料中包含了速效、中效、长效的氮素养分．其氮素利用率可达50％，减少30...

Technology for production of urea-formaldehyde slow release compound fertilizer by retrofitted compound fertilizer plant

Based on the transformation of compound fertilizer plant by steam-drum granulation or disk granulation, the urea-formaldehyde slow release compound fertilizer is prepared. The production principle, the reaction controlling condition, production process of urea-formaldehyde, the advantages of steam-drum granulation plant for production of urea-formaldehyde including less investment, short construction period and low production cost etc are introduced. The fertilizer contains quick-available nitrogen, median- available nitrogen, long-available nitrogen, the utilization rate of nitrogen element is over 50%, there is no loss in the yield by reducing 30% fertilizer dosage.