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| Thermodynamic Analysis and Feasibility Study of a Novel Carbothermal Reduction of Magnesium Smelting |
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Received:May 27, 2024
Revised:June 07, 2024
Accepted:June 11, 2024
Published Online:November 17, 2024
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| DOI：doi：10.3969/j.issn.1007-7545.2024.12.007 |
| KeyWord:magnesium smelting; carbothermal method; side reaction; calcium carbide |
| Author | Institution |
| LI Xiaofeng |
宝钢金属有限公司 |
| LIU Jinhui |
郑州大学 |
| ZHANG Shaojun |
郑州大学 |
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| Abstract: |
| The carbothermal process of magnesium smelting has the advantages of low energy consumption and low carbon emissions. However, it has not been used industrially due to the problem of reverse reaction in the mixed gas. A new type of carbothermal reduction of magnesium smelting was proposed and thermodynamic calculation was carried out by FactSage8.2 software. The suitable temperature and system vacuum degree for the first stage magnesium refining process are 1 250—1 350 ℃ and 2 000—4 000 Pa, respectively, while for the second stage carbothermic smelting process they are 1 650—1 800 ℃ and 3 000—10 000 Pa, respectively. The experimental results show that with the increase of system pressure, the degree of occurrence of side reactions in the first stage decreases. Under the conditions of 1 350 ℃, 4 000 Pa and a reaction time of two hours, the reduction rate of magnesium refining in the first stage is over 90% and the occurrence of secondary reactions is weak. Under the conditions of 1 800 ℃, 5 000 Pa and a reaction time of half hour, the quality of calcium carbide obtained in the second stage reaction can meet market standards for superior grade (gas yield ≥300 L/kg). |
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