集成化白云石悬浮煅烧引领镁产业变革

Integrated Suspension Calcination of Dolomite Leads Great Change in Magnesium Industry

白云石煅烧作为硅热法炼镁的第一步,不仅是主要的能耗和碳排放环节,其煅烧产物的质量更是直接影响原镁的产率与品质。目前主流的回转窑煅烧工艺存在热效率低、能耗高、污染大、单线产能低、产品质量不稳定等问题,整个煅烧工序亟待技术革新。提出了利用悬浮态煅烧替代回转窑进行白云石煅烧,并对两种工艺进行了综合对比,悬浮煅烧呈现出显著的技术、环保及经济优势:理论上节能50%以上,CO_(2)减排超20%,生产成本较目前降低35%,而且可以有效避免“过烧”和“欠烧”,获得高质量、性能稳定性好的煅烧产物,为后续炼镁环节提供优质原料。还分析了用绿色、高效的集成化白云石悬浮煅烧技术替代目前的“分散式”煅烧的可行性及对整个镁产业可能产生的颠覆性影响。

The calcination of dolomite,as the first step of silicothermic reduction magnesium production,is not only the main step of energy consumption and carbon emission,but also the key influencing factor for the yield and quality of primary magnesium.At present,the mainstream calcining process of rotary kiln is faced with many problems,such as low thermal efficiency,high energy consumption,large pollution,low single-line production capacity and unstable product quality.The whole calcination process is in urgent need of technical innovation.In this paper,suspension calcining process is proposed to replace rotary kiln for dolomite calcination,and the two processes are compared comprehensively.The former shows remarkable technological,environmental and economic advantages:theoretically,the energy saving is more than 50%,the CO_(2) emission reduction is more than 20%,the production cost is reduced by 35%compared with the present,and can effectively avoid“overburning”and“underburning”to obtain high quality calcined products with stable performance for the subsequent magnesium smelting process.This paper also analyzes the feasibility of replacing the present“scattered”calcination with environment friendly and efficient integrated dolomite suspension calcination and its possible revolutionary influence on the whole magnesium industry.