Novel Method to Prepare Magnesium by Aluminothermic Reduction of Magnesia and Calcium Hydroxide at Normal Atmosphere, 1223 K (950 °C)
| Autor: | Xiao-Hu Hua, Jumei Zhang, Li Bin Niu, Wanchang Sun, Shuang-Ming Du, Bin Zheng, Teng Zhang |
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| Rok vydání: | 2016 |
| Předmět: |
Diffraction
Calcium hydroxide Materials science Scanning electron microscope Magnesium Metallurgy Metals and Alloys chemistry.chemical_element 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 020501 mining & metallurgy Grinding chemistry.chemical_compound 0205 materials engineering chemistry Chemical engineering Mechanics of Materials Materials Chemistry Sodium stearate 0210 nano-technology Ball mill Scherrer equation |
| Zdroj: | Metallurgical and Materials Transactions B. 48:488-496 |
| ISSN: | 1543-1916 1073-5615 |
| DOI: | 10.1007/s11663-016-0821-8 |
| Popis: | An experimental apparatus was designed to investigate the aluminothermic reduction of the mixture of MgO and Ca(OH)2 at normal atmosphere, 1223 K (950 °C), with the molar ratio of MgO:Al:Ca(OH)2 to be 3:2:1, reinforced by high-energy ball milling. The effect of mechanical milling time and content of grinding aid (sodium stearate) on the reduction ratio of MgO were studied. Moreover, the reduzate and reactant activated by ball milling were analyzed by X-ray diffraction, scanning electron microscopy, and energy-dispersive spectrometer analysis. The average grain sizes of Al and MgO activated by ball milling were also calculated by Scherrer formula. The results indicate that the reduction ratio of MgO is increased with increasing mechanical milling time and content of sodium stearate. The high-energy ball milling has good reinforcement on the aluminothermic reduction of MgO. Moreover, the strengthening mechanism of mechanical force on the reaction was further discussed. |
| Databáze: | OpenAIRE |
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