地沟油生产包膜缓控释肥的工艺研究

Study of production technology of slow release fertilizer by waste oil

采用地沟油为包膜剂A,多元醇、有机硅、二甘醇、二甲苯等添加剂混合物为包膜剂B,以大颗粒尿素为核心,利用滚动流化床包膜技术,制备缓控释包膜尿素。产品按国标GB/T 23348—2009进行检测,利用显微镜对膜层进行观察。结果表明,当包膜剂A和包膜剂B混合加料,包膜剂总量为尿素质量的6%,分3次加料,且每次分别为3%,2%,1%时,所得产品既符合国标要求,又可最大限度控制生产成本。

A new technology in producing coated urea slow release fertilizer by waste oil in pilot-plant.The production was prepared by waste oil as coated material A and hardener as coated material B on the surface of large granular urea,which formed a layer of film in Fluid Bed equipment. The experimental factors were optimized and can be used in industrial production. The fertilizer samples were analyzed according to the national standard（ GB/T 23348—2009）,and the film layer morphology was observed by a microscope. The results show that when the coated material A and coated material B were mixed for coating,and accounts for 6% of the total product. The material mixture were fed in three times with different loading of 3%,2%,1% respectively. The new product not only reached the GB standard,but also show the potential to in lower cost. This new technology can be directly applied to the mass fertilizer production process.