白云石碳化法生产轻质氧化镁的节能途径

Energy-saving ways for the production of lightweight magnesium oxide by carbonation of dolomite

针对现有白云石碳化法生产轻质氧化镁过程二氧化碳浓度低、全过程温度变化大和单位产品综合能耗占工厂成本60％-80％等问题，在理论分析和计算的基础上，提出加压碳化（0．3—0．5MPa）和热解二氧化碳回收以提高碳化气二氧化碳浓度，降低碳化温度（≤293K），提高重镁水浓度，采用先进干燥及燃烧设备和能量分级利用等措施，使单位产品综合能耗能够降低60％以上，方法可靠。

Aiming the problems in the lightweight MgO production by carbonation of dolomite, such as low CO2 concentration,large fluctuation of temperature and high energy consumption of unit product （ which accounts for 60% - 80% production cost） , methods were proposed on the basis of theory analysis and calculation to decrease the cost of energy, which include：raising the pressure of carbonation, recovering the CO2 in the pyrolysis process to raise CO2 concentration in carbonating gas, lowing the carbonation temperature （ lower than 293 K ） , increasing the concentration of MgHCO3 , staging the energy use and utilizing advanced dry and combustion equipment etc.. With these methods, the consumption of energy can be reduced by more than 60%.