Thermal Stability and Properties of New NPS-Fertilisers

New NPS-fertilisers are investigated using TG-DTA systems and other techniques to determine their thermal stability and properties. The main component is ammonium sulphate by-product from clean-up technologies. Acidic reaction of ammonium sulphate (AS) is compensated by adding treated or untreated phosphates. Some samples are additionally mechanochemically activated. Tribochemical effects are confirmed. Distribution and conversion of harmful impurities are also studied. The results clearly show that the histories of components, additional treatment and the initial content of impurities affect the thermal properties of the new fertilisers. The mass component's ratio influences the thermal fertiliser's stability and their solubility. It is shown that the by-product from electron beam technology is the most suitable component, because of high-activity. The results obtained confirmed that TG and DTA techniques could be successfully used for products quality control. Most of the simultaneous TG, DTG and DTA curves may have a practical application for future studies and comparative analysis. This revised version was published online in July 2006 with corrections to the Cover Date.