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在氧化铝生产中,一水硬铝石及一水软铝石型铝土矿,其溶出反应均在较高温度下进行。工业上已经应用的最高温度已达270℃,压力相当于50公斤/厘米~2左右。反应完毕后,高温物料必须降至常压,再送到下一工序。关于降压方式,多数工厂均采用自蒸发器扩容降温降压。降压过程产出的二次蒸汽及凝结水,必须回收利用其热量,以提高热利用效率,减少高能位的外热源消耗。二次蒸汽后凝结水的热量,主要部分用于预热进入溶出过程的冷原矿浆,少量用于加热赤泥洗水。为
In the alumina production, diaspore and boehmite bauxite, the dissolution reaction was carried out at higher temperatures. Industrial maximum temperature has reached 270 ℃, the pressure is equivalent to 50 kg / cm ~ 2 or so. After the reaction is completed, the high temperature material must be reduced to atmospheric pressure, and then sent to the next process. About step-down mode, most of the factories are used from the evaporator expansion cooling step-down. The secondary steam and condensate produced during the depressurization process must be recycled and used to increase the heat utilization efficiency and reduce the external heat source consumption at high energy levels. After the second steam heat of condensation water, the main part is used to preheat the leaching process into the cold ore pulp, a small amount of red mud for heating water washing. for