A recovery system and recovery process for recovering salt from desulfurization wastewater
A desulfurization wastewater and process technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, alkali metal chloride, etc., can solve problems such as affecting salt purity, and achieve the effect of avoiding corrosion
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[0034] refer to Figure 1-2 , a recovery system for recovering salt from desulfurization wastewater described in this embodiment, including a purification treatment device 1, a pre-heat exchange device 2, a primary evaporation crystallization device 3, a primary material transfer pump 4, and a secondary evaporation crystallization device 5. A primary centrifuge 6, a drying bed 7, a secondary centrifuge 8 and a salt-dissolving tank 9; the purification treatment device 1 is a softened water device.
[0035] One of the water inlets of the purification treatment device 1 is connected to the desulfurization wastewater delivery pipe 10, and the water outlet of the purification treatment device 1 is connected to the pre-heat exchange device 2 and the primary evaporation crystallization device 3 through pipelines in turn; the primary evaporation crystallization The output port of the primary concentrated brine of the device 3 is connected with the secondary evaporation and crystalliza...
Embodiment 1
[0061] Example 1: Evaporation at 50°C
[0062] Sodium chloride-sodium sulfate-water solubility components, as shown in Table 3:
[0063] Table 3 Solubility of sodium chloride-sodium sulfate-water at 50℃
[0064]
[0065]
[0066] According to the mutual solubility relationship of sodium chloride-sodium sulfate at 50°C, the first-stage evaporation should control the sodium sulfate component to be less than 5.3%, and the sodium chloride component is greater than 24.2%, so that sodium chloride crystals can be precipitated, and Sodium sulfate did not precipitate out. That is, the primary evaporation is:
[0067] m (Na2SO4) / (M 总 -M 蒸发 )*100%<5.3%;
[0068] m 蒸发 总 -M (Na2SO4) *100% / 5.3%;
[0069] m 蒸发 <15943.2-317.3*100% / 5.3% Kg / h;
[0070] i.e. M 蒸发 <9956.4Kg / h;
[0071] Now sodium chloride component content is: M (NaCl) / (M total-M evaporation)*100%=2900 / (15943.2-9956.4)*100%=48.44%;
[0072] The solubility of sodium chloride is greater than 24.2% at this tempe...
Embodiment 2
[0079] Example 2: Evaporation at 75°C
[0080] Solubility components of sodium chloride-sodium sulfate-water, as shown in Table 4:
[0081] Table 4 Solubility of sodium chloride-sodium sulfate-water at 75°C
[0082]
[0083] According to the mutual solubility relationship of sodium chloride-sodium sulfate at 75°C, the first-stage evaporation must control the sodium sulfate component to be less than 4.95%, while the sodium chloride component is greater than 25.25%, so that pure sodium chloride crystals can be precipitated. And sodium sulfate did not separate out. That is, the primary evaporation is:
[0084] m (Na2SO4) / (M 总 -M 蒸发 )*100%<4.95%;
[0085] m 蒸发 总 -M (Na2SO4) *100% / 4.95%;
[0086] m 蒸发 <15943.2-317.3*100% / 4.95% Kg / h;
[0087] i.e. M 蒸发 <9533.1Kg / h;
[0088] Now sodium chloride component content is:
[0089] m (NaCl) / (M 总 -M 蒸发 )*100%=2900 / (15943.2-9533.1)*100%=45.24%;
[0090] The solubility of sodium chloride is greater than 25.9% at this tem...
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