【摘要】 白云石煅烧作为皮江法炼镁的首道工序，其能耗占原镁生产全流程的30%～40%，是镁冶炼节能减碳的关键环节。基于国际镁协（IMA）2024年发布的镁行业脱碳战略路线图提出的短期目标——聚焦内部流程优化，本文以陕北某金属镁冶炼的白云石煅烧阶段为研究对象，通过工艺装备分析与热平衡计算，量化了煅烧工序的能耗结构及节能减碳潜力，并从烟气余热回收、煅白余热回收、新型环保隔热材料、富氧燃烧及数字化热管理等方面探讨了节能降碳的技术路径。研究表明，当前煅白生产能耗（553.29 kgce/t）显著高于理论值（194.21 kgce/t），其中烟气余热（占总热收入60%）的回收是落实IMA短期脱碳目标的核心路径。采用预热器、富氧燃烧等集成技术，可使能耗降低至270.29～330.29 kgce/t，热效率可提高至59%～71%，吨煅白CO₂排放量可减少558.8～718.82 kg。更多还原

【Abstract】 As the first process of Pidgeon magnesium smelting, the energy consumption of dolomite calcination accounts for 30%-40% of the whole process of magnesium production, which is the key link of energy saving and carbon reduction in magnesium smelting. Based on the short-term goal proposed by the decarbonization strategy roadmap of the magnesium industry released by the International Magnesium Association（IMA） in 2024-focusing on internal process optimization, this paper took the dolomite calcination stage of a metal magnesium smelting in northern Shaanxi as the research object. Through process equipment analysis and heat balance calculation, the energy consumption structure and energy saving and carbon reduction potential of the calcination process were quantified, and the technical path of energy saving and carbon reduction was discussed from the aspects of flue gas waste heat recovery, calcined white waste heat recovery, new environmental protection insulation materials, oxygen-enriched combustion and digital thermal management. The research shows that the current energy consumption of calcined dolomite production（553. 29 kgce/t） is significantly higher than the theoretical value（194. 21 kgce/t）, and the recovery of flue gas waste heat（60% of the total heat income） is the core path to implement the short-term decarbonization goal of IMA. By adopting integrated technologies such as preheater and oxy-fuel combustion, the energy consumption can be reduced to 270. 29-330. 29 kgce/t, the thermal efficiency can be increased to 59%-71%, and the CO₂ emission per ton of calcined white can be reduced by 558. 8-718. 82 kg.更多还原