Search results for "Calcination"
showing 2 items of 112 documents
Surface interaction of Ni/Mo oxides on ultrastable Y zeolites
1986
The interactions of NiO, MoO 3 and their mixtures with the acid surface of an H-Y ultrastable zeolite have been studied on a series of samples. These samples were prepared by impregnation, calcination and reduction, (if necessary), of Ni and Mo salts, on an H-Y ultrastable zeolite (HYUS). By using i.r. spectroscopy and X-ray diffraction techniques it has been observed that MoO 3 interacts with most of the hydroxyl groups while NiO interacts only with those appearing at 3640 and 3550 cm −1 . In the samples containing both oxides a strong interaction between them is shown, while the acidity of the original HYUS is partially regenerated. The influence of the order of impregnation on the final …
The use of calcined paper mill sludge as a chemical precipitant in the simultaneous removal of ammonium and phosphate : paper mill waste recycling an…
2020
Currently, recycling and re-use of materials is extremely important due to the diminishing of natural resources. The objective of the European Union’s circular economy strategy is to increase recycling and the use of industrial waste materials and side streams as secondary raw materials. In this study, a chemical precipitation method to simultaneously remove ammonium nitrogen and phosphate from the liquid phase of anaerobic digestate using calcined paper mill sludge was studied. Papermill sludge is a waste material that forms in the paper-making process. In addition, commercial calcium oxide (CaO) was used as a reference precipitant. The suitability of the formed precipitate’s composition f…