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- Title
INFLUENCE OF CARBON AND ADDITIVES ON THE HIGH-TEMPERATURE DECOMPOSITION BEHAVIOR OF PHOSPHOGYPSUM.
- Authors
Rui Fang; Hongbin Tan; Wenjie Mao; Xiaoling Ma; Ying Feng; Qian Jiang; Feihua Yang
- Abstract
The influence of carbon and iron additives on the high-temperature decomposition behavior of phosphogypsum (PG) is systematically investigated using XRD, SEM and EDS. In the absence of carbon, a small amount of anhydrite phase is decomposed after sintering at 1200 °C for 2 h. However, the undesirable oldhamite phase is observed in RG/carbon50, PG/carbon/FeSCh mixtures, PG/FeS2 mixtures embedded in carbon after sintering at 800 °C for 2 h, respectively, which implies a strong reducing atmosphere can promote oldhamite to generate. In the case of a PG/carbon 100 mixture, the diffraction peaks of anhydrite are not observed after sintering at 1100 °C for 2h. Moreover, the main phases in the mixture are found to be wollastonite-2M, larnite, calico-olivine, gehlenite and lime. Overall, the anhydrite decomposition to lime is mainly influenced by carbon and the sintering temperature.
- Subjects
ADDITIVES; HEAT resistant materials; PHOSPHOGYPSUM; BIODEGRADATION; ANHYDRITE
- Publication
Materials & Technologies / Materiali in Tehnologije, 2020, Vol 54, Issue 6, p861
- ISSN
1580-2949
- Publication type
Article
- DOI
10.17222/mit.2020.083