Research on the preparation of ammonium sulfate by neutralizing waste sulphuric acid etching solution with ammonia water
In response to the high content of H2SO4 and low impurity content in waste sulphuric acid in the semiconductor industry,the ammonia neutralization method is used to treat sulphuric acid waste liquid.The neutralized solution can generate solid ammonium sulfate products through processes such as evaporation,concentration and centrifugal separation.Based on the Aspen Plus software platform,the influence of pH control value on the production of reaction products in neutralization reaction is studied,and the process control parameters,material and energy consumption of ammonia neutralization process and ammonium sulfate solution evaporation process are simulated and analyzed.According to the simulation analysis results,a new production line with a processing capacity of 20 kt/a for the resource utilization of waste sulphuric acid has been built.After the device is successfully put into operation,the quality of the solid ammonium sulfate products produced meets the requirements of Industrial Ammonium Sulfate and Type Ⅱ indicators in Fertilizer Grade Ammonium Sulfate.
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