MVR Three-effect Evaporation Ammonium Chloride Crystallization Process
2020-05-02
Common processes for ammonium chloride wastewater treatment generally includeMVRthree-effect evaporationProcess, multi-effect evaporation process, forced circulation evaporation process and other evaporation crystallization process, today Xiaobian and everyone together to look at its crystallization process, look at the application in ammonium chloride wastewater.MVRthree-effect evaporationAmmonium chloride process is mainly the use of multi-effect evaporation process, according to the customer's water and drainage situation for its design process.
Ammonium chloride wastewater is generally produced in the process of chemical fertilizer industry, rare earth production, amino acid production and pesticide production. Although these wastewater contains ammonium chloride, the water quality content is slightly different. Most of the ammonium chloride wastewater will contain sulfate, carbonate, calcium and magnesium ions, organic matter, etc.
Since the solubility of ammonium chloride varies greatly with temperature, the useMVRthree-effect evaporationammonium chloride, followed by enteringOSLOCool down the crystallizer, cool down40℃Ammonium chloride crystals were precipitated left and right. The three-effect evaporation ammonium chloride process is currently widely used, the technology is relatively mature, and the return flow of the mother liquor of this process is relatively large.
If the concentration of ammonium chloride feed to be treated is low, a combination with the falling film evaporation process is generally used. The ammonium chloride solution concentrated by evaporation is recrystallized after concentration, the crystal slurry material is buffered by pumping to the thickener, the thickened material enters the centrifuge for centrifugal separation, the crystalline product is dried, the centrifugal mother liquor is refluxed to the mother liquor tank, and then enters the evaporator through the mother liquor pump to continue evaporation and concentration.
Due to the large difference in the impurity composition of ammonium chloride wastewater solution produced by different industries, the boiling point of ammonium chloride wastewater should be raised when selecting different evaporation processes,CODThe determination of such data in order to choose a more reasonable evaporation process. Ammonium chloride solubility is large, instantaneous precipitation of crystals, easy to cause pipe blockage phenomenon, so in the design.MVRthree-effect evaporationAmmonium chloride crystallization process, to consider many aspects of anti-blocking design.
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