Method for treating catalyst production wastewater
A technology for the production of wastewater and treatment methods, applied in multi-stage water treatment, chemical instruments and methods, heating water/sewage treatment, etc., can solve the problems of low cost, high cost of wastewater treatment, and only mixed salt crystals can be obtained
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Embodiment 1
[0136] like figure 1 As shown, the catalyst production wastewater (containing NaCl 63g / L, Na 2 SO 4 65g / L, NH 4 Cl 25.2g / L, (NH 4 ) 2 SO 4 26.4g / L, pH 7.0) with a feed rate of 5m 3 The speed of / h is sent into the pipeline of the treatment system, and the sodium hydroxide aqueous solution that imports concentration is 45.16 mass % in the pipeline is carried out the pH value adjustment for the first time, by the first pH value measuring device 61 (pH meter) after adjusting The pH value is monitored (measured value is 8.6), then a part of the waste water is sent into the first heat exchange device 31 to exchange heat with the first ammonia-containing steam condensate by the first circulation pump 71, and returns with the ninth circulation pump 79 The third mother liquor is mixed, and another part is sent into the eleventh heat exchange device 30 to exchange heat with the first mother liquor, and the two parts are combined to obtain waste water to be treated (wherein SO ...
Embodiment 2
[0146] Carry out the treatment of catalyst production waste water according to the method for embodiment 1, difference is: to containing NaCl 45g / L, NaCl 2 SO 4 90g / L, NH 4 Cl 15.1g / L, (NH 4 ) 2 SO 4 30.7g / L, pH is 6.6 catalyst production wastewater is processed, and SO 4 2- with Cl - The molar ratio is 1:1.59, and the temperature of the wastewater to be treated after heat exchange by the eighth heat exchange device 38 is 102°C.
[0147] The temperature of the first evaporation is 95°C, the pressure is -36.36Pa, and the evaporation volume is 4.51m 3 / h; the temperature of cooling and crystallization is -4°C, and the time is 120min; the temperature of the second evaporation is 75°C, the pressure is -72.75Pa, and the evaporation volume is 1.15m 3 / h.
[0148] The first solid-liquid separation device 93 obtains the sodium sulfate crystallization filter cake 625.74kg of water content 1.4 mass % per hour, wherein the content of sodium chloride is below 1.5 mass %) with t...
Embodiment 3
[0153] Carry out the treatment of catalyst production waste water according to the method for embodiment 1, difference is: to containing NaCl 80g / L, NaCl 2 SO 4 42g / L, NH 4 Cl 37.1g / L, (NH 4 ) 2 SO 4 19.8g / L, pH is 6.9 catalyst production wastewater is processed, and the SO 4 2- with Cl - The molar ratio is 1:6.03, and the temperature of the waste water to be treated after heat exchange through the eighth heat exchange device 38 is 112°C.
[0154] The temperature of the first evaporation is 105°C, the pressure is -7.01Pa, and the evaporation volume is 3.43m 3 / h; the temperature of cooling and crystallization is 0°C, and the time is 120min; the temperature of the second evaporation is 100°C, the pressure is -22.83Pa, and the evaporation volume is 2.11m 3 / h.
[0155]The first solid-liquid separation device 93 obtains the sodium sulfate crystallization filter cake 319.54kg of water content 1.5 mass % per hour, wherein the content of sodium chloride is below 1.5 mass ...
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