4.4 Thermochemische Reststoffbehandlung und Wertstoffrückgewinnung
Filtern
Dokumenttyp
Sprache
- Englisch (107) (entfernen)
Schlagworte
- Phosphorus (14)
- Phosphorus recovery (14)
- Sewage sludge (12)
- Recycling (10)
- Fertilizer (8)
- BOFS (6)
- Fertilzer (6)
- Hydraulic reactivity (6)
- Scandium (6)
- Portland Cement (5)
- Pyrometallurgy (5)
- Sewage sludge ash (5)
- Wastewater (5)
- XANES spectroscopy (5)
- Alite (4)
- Circular economy (4)
- Diffusive gradients in thin films (DGT) (4)
- Electric arc furnace dust (4)
- Environmental evaluation (4)
- Gypsum (4)
- Red Mud (4)
- Steelmaking slag (4)
- Tantalum (4)
- X-ray absorption near-edge structure (XANES) spectroscopy (4)
- Zinc (4)
- Bauxite Residue (3)
- Blast furnace sludge (3)
- Carbon Fibers (3)
- Diffusive Gradients in thin films (DGT) (3)
- Phosphorus fertilizer (3)
- Recycling fertilizer (3)
- Selective chlorination (3)
- Soil (3)
- X-ray diffraction (3)
- Agronomic performance (2)
- Ammonium (2)
- AshDec (2)
- Bagasse (2)
- Bassanite (2)
- Building and Construction (2)
- CDW processing (2)
- CFK (2)
- Cabonfasern (2)
- Calcium alkali phosphate (2)
- Calcium silicate (2)
- Calcium sulfate (2)
- Carbide formation (2)
- Carbon feeding (2)
- Chromium (2)
- Clinker substitute (2)
- Combustion Ion Chromatography (2)
- DGT (2)
- Diffusive gradients in thin-films (DGT) (2)
- Electric Arc Furnace (2)
- Elektroofenstaub (2)
- Gichtgasschlamm (2)
- Gypsum recycling (2)
- Heavy metal removal (2)
- Infrared spectroscopy (2)
- Laser-induced breakdown spectroscopy (2)
- Leaching (2)
- Leaching control mechanisms (2)
- Melting experiments (2)
- Nitrification inhibitor (2)
- Nutrient (2)
- Per- and Polyfluoroalkyl substances (PFAS) (2)
- Phopshorus recovery (2)
- Pollutant (2)
- Raman spectroscopy (2)
- Recycling fertiliser (2)
- Recycling fertilisers (2)
- Reduction process (2)
- Ressourcenrückgewinnung (2)
- Scattering (2)
- Sewage sludge ordinance (2)
- Soil P species (2)
- Steelmaking (2)
- Struvite (2)
- Thermal treatment (2)
- Thermochemical treatment (2)
- Tricalcium-silicate (2)
- X-ray adsorption near-edge structure (XANES) spectroscopy (2)
- XANES (2)
- Zink (2)
- Aerodynamic levitation (1)
- Alite hydraulic reactivity (1)
- Aluminium (1)
- Ashdec (1)
- BESSY (1)
- Bauxite residue (1)
- Bioavailability (1)
- Bioceramics (1)
- Blast-furnace sludge (1)
- Bushveld Complex (1)
- CFRP (1)
- CaNaPO4 (1)
- Calcium carbonate (1)
- Chemical extraction (1)
- Chemical extraction methods (1)
- Chicken manure (1)
- Chicken manure ash (1)
- Chlorination (1)
- Chlorine (1)
- Chromitites (1)
- Clean steel (1)
- Co-combustion (1)
- Combustion and gasification (1)
- Controlled release fertilisers (1)
- Corrosion (1)
- Critical raw materials (1)
- Crystalline phase identification (1)
- Design of experiments (1)
- Diffusive Gradients in Thin-films (DGT) (1)
- EAF slags (1)
- Electric arc furnace (EAF) slags (1)
- Electric arc furnace slags (1)
- Entropy (1)
- Extraction (1)
- FactSage calculations (1)
- FactSageTM calculations (1)
- Forest soils (1)
- Formation enthalpy (1)
- General Environmental Science (1)
- General Materials Science (1)
- Granulat (1)
- Gypsum fiberboards and synthetic gypsum (1)
- Gypsum plasterboards (1)
- Gypsum waste (1)
- Hazardous waste (1)
- Hazenite (1)
- Heat capacity (1)
- Hydration products (1)
- Hydrogen (1)
- ICP-MS (1)
- ICP-OES (1)
- In situ (1)
- In situ synchrotron x-ray diffraction (1)
- In-situ analysis (1)
- Incubated soil/fertilizer mixtures (1)
- Industrial and Manufacturing Engineering (1)
- Interlaboratory comparison (1)
- Iron making (1)
- LCA (1)
- Lead (1)
- Lightweighting (1)
- MSWI fly ash (1)
- Materials Chemistry (1)
- Mechanische Stabilität (1)
- Metals and Alloys (1)
- Microbially induced carbonate precipitation (MICP) (1)
- Multidisciplinary (1)
- Municipal sewage sludge (1)
- MySpot (1)
- Nano-Fourier-transform infrared spectroscopy (1)
- Niobium (1)
- Nitrate (1)
- Nitrogen (1)
- Nährstoffe (1)
- On-line analysis (1)
- Oxide melts (1)
- P sink method (1)
- P speciation (1)
- P-efficiency (1)
- P-recovery (1)
- Passive sampling (1)
- Phase formation (1)
- Phase transformation (1)
- Phoshpor availability (1)
- Phosphate dynamics (1)
- Phosphate extractability and availability (1)
- Phosphorus availability (1)
- Phosphorus elimination (1)
- Phosphorus plant-availability (1)
- Phosphorus recycling (1)
- Phosphous recovery (1)
- Photometric P determination (1)
- Plant Experiment (1)
- Plant availability (1)
- Plant growth test (1)
- Plant-availability (1)
- Plasma (1)
- Platinum (1)
- Pot experiment (1)
- Pot experiments (1)
- Process Metallurgy (1)
- Process control (1)
- Process upscaling (1)
- Push-out Test (1)
- Raman (1)
- Recovery (1)
- Recovery potential (1)
- Recycled gypsum (1)
- Recycled sources (1)
- Red mud (1)
- Reduction (1)
- Renewable Energy, Sustainability and the Environment (1)
- Resource Recovery (1)
- Rhenanite (1)
- SCALE (1)
- Sc recovery (1)
- Scattering-type scanning near-field optical microscopy (s-SNOM) (1)
- Secondary P-fertilizer (1)
- Secondary Recources (1)
- Selective Chlorination (1)
- Sewage Sludge (1)
- Sewage Sludge Ashes (1)
- Sewage sludge ash (SSA) (1)
- Sewage sludge disposal (1)
- Sewage sludge incineration (1)
- Silicate (1)
- Silicon carbide (1)
- Spectroscopy (1)
- Steelmaking residues (1)
- Strategy and Management (1)
- Sugar cane bagasse (1)
- Sugarcane bagasse (1)
- Sustainability (1)
- Synchrotron (1)
- Synchrotron radiation (1)
- Thermal analysis (1)
- Ureolytic bacteria (1)
- Waste water (1)
- Waste water treatment (1)
- Wood ash (1)
- X-ray diffraction (XRD) (1)
- X-ray spectroscopy (1)
- Zinc chloride (1)
- fertilizer (1)
- infrared spectroscopy (1)
- microspectroscopy (1)
- multi scale testing (1)
- soil (1)
- x-ray diffraction (1)
Organisationseinheit der BAM
- 4.4 Thermochemische Reststoffbehandlung und Wertstoffrückgewinnung (107) (entfernen)
Paper des Monats
- ja (3)
Eingeladener Vortrag
- nein (40)
Conventional fertilisers have their disadvantages as nutrient release is not synchronised with the demand of plants. Several approaches of "next generation fertilisers" are aiming at controlled nutrient release. Recycling fertilisers are often not soluble in water but fully plant available. They are suitable raw materials for the production of new types of controlled release fertilisers.
A new sewage sludge ordinance was set in force in Germany in 2017 that makes phosphorus recovery from sewage sludge mandatory. The technological possibilities for P-recovery from waste water, sewage sludge and sewage sludge ash were presented.
Steelmaking slag is a by-product of steel production, of which 4.5 Mt were produced in 2020 in Germany alone. It is mainly used in road construction, earthwork and hydraulic engineering. A smaller part is returned to the metallurgical cycle, used as fertiliser or landfilled.
With this use, iron oxides still contained in steelmaking slag are lost. In addition, the possibility of producing higher-grade products from steelmaking slag is foregone. In recent decades, many researchers have investigated the production of Portland cement clinker and crude iron from basic oxygen furnace slags (BOFS) via a reductive treatment. Carbothermal treatment of liquid BOFS causes a reduction of iron oxides to metallic iron, which separates from the mineral phase due to its higher density. Simultaneously, the chemical composition of the reduced slag is adapted to that of Portland cement clinker.
In this study, German BOFS was reduced in a small-scale electric arc furnace using petrol coke as a reducing agent. The resulting low-iron mineral product has a similar chemical composition to Portland cement clinker and was rich in the tricalcium silicate solid solution alite (Ca3SiO5). Based on its chemical and mineralogical composition, similar to that of Portland cement clinker, the reduced BOFS has the potential to react comparably. In our study, the reduced BOFS produced less hydration heat than OPC, and its hydraulic reaction was delayed. However, adding gypsum has shown to accelerate the hydration rate of the reduced BOFS compared to that known from the calcium silicates of Portland cement clinker.
Further research to improve the hydraulic properties of the reduced slag is essential. If successful, producing a hydraulic binder and crude iron from BOFS has economic and ecological benefits for both the cement and steel industries.