| 摘要 |
<p>A continuous process for the non-destructive recovery of natural nitrogenous materials as highly available particulate agricultural nutrients is described. The process employs natural materials such as poultry waste, waste water treatment sludge, alfalfa meal, hatchery waste, fea-thermeal, corn gluten meal, and bloodmeal in a fluid bed reactor-granulator. The natural materials, which are basic in nature or have been made basic, are acidified to pHs of about 3.0 to 6.5 in the reactor-granulator and formed into hardened particulates during a retention time of between about 4 to 20 minutes at a temperature between about 70-120 DEG C. The particulates are discharged free of caramelization and before nitrogen loss from decomposition amounts to 0.5 percent of the natural nitrogenous materials. The continuous process provides a new natural nitrogenous particulate agricultural nutrient composition free of caramelization.</p> |
