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用一水硬铝石生产氧化铝,要用高温、高浓度的苛性碱溶液作反应介质。提高生产过程中循环溶液苛性碱浓度的手段是蒸发,其主要设备是外加热自然循环蒸发器(见图1),经蒸发后碱溶液浓度为250～270克/升(以Na_2O计),温度在130℃左右。
Production of alumina with diaspore, the use of high temperature, high concentration of caustic solution as the reaction medium. The main means to increase the concentration of caustic soda in the circulating solution during the production process is evaporation. The main equipment is an externally heated natural circulation evaporator (see Figure 1). After evaporation, the concentration of alkali solution is 250 to 270 g / l (calculated as Na2O) Around 130 ℃.