NiO reduction by Mg + C combined reducer at high heating rates
| Autor: | Kh. T. Nazaretyan, M. K. Zakaryan, Sofiya Aydinyan, Suren Kharatyan |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Reducer Magnesium Nickel oxide Kinetics Non-blocking I/O Analytical chemistry chemistry.chemical_element 02 engineering and technology Activation energy 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 010406 physical chemistry 0104 chemical sciences chemistry Melting point Physical and Theoretical Chemistry 0210 nano-technology Ternary operation |
| Zdroj: | Journal of Thermal Analysis and Calorimetry. 146:1811-1817 |
| ISSN: | 1588-2926 1388-6150 |
| Popis: | The mechanism and kinetics of nickel oxide reduction by Mg + C combined reducer at non-isothermal conditions in a wide range of high heating rates (100–1200 °C min−1) were studied by high-speed temperature scanner technique. It was shown that both the magnesiothermal and magnesiocarbothermal reduction processes, unlike low heating rates (5–20 °C min−1, DTA/DTG method), start beyond the melting point of magnesium and proceed via solid + liquid scheme. It was found out that the utilization of Mg + C combined reducer allows to significantly lower the reduction temperature (by about 200–400 °C) of nickel oxide as compared with exclusively magnesium or carbon reducers evidencing on the synergetic effect of combined reducers in the ternary mixture. The effective values of activation energy (Ea) for the NiO + Mg and 2NiO + Mg + C reactions were determined to be 185 ± 15 kJ mol−1 and 195 ± 15 kJ mol−1, respectively. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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