Production process of zinc sulfate heptahydrate

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Production process of zinc sulfate heptahydrate: Temperature (°C): 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100. Solubility (g/100 mL): 41.6, 47.2, 53.8, 61.3, 70.5, 73.2, 75.4, 73.2, 71.1, 65.3, 60.5. The mother liquor from the crystallization stage (a dilute solution of zinc sulfate) is added to a reactor lined with ceramic plates; zinc oxide (or zinc-containing ores, zinc ash, zinc slag) is then added under stirring to form a slurry. Sulfuric acid is subsequently added, and the temperature in the reactor rises gradually as a result. The reaction is carried out at the appropriate concentration and pH level; after the reaction, the pH and temperature are adjusted. Impurities are removed through filtration equipment before the mixture is sent to a storage tank. It then enters an evaporation and crystallization unit (a triple-effect evaporator or MVR evaporator) where it is concentrated to a saturated state, after which it is removed from the system. The mother liquor or seed crystals are added back, the temperature is reduced to around 35 degrees, and centrifugal dehydration is performed. The product is zinc sulfate heptahydrate. Hebei Yunhao Lao Zhang 15830976988