Method for extracting two secondary salts from desulfurized salt-containing waste liquid of coke oven gas
A technology for coke oven gas and desulfurization waste liquid, which is applied in the directions of thiosulfate/dithionite/polythionite, ammonium sulfate, thiocyanate, etc., and can solve the problem that the economic value thiosulfuric acid cannot be purified. The problems of ammonium, crystal concentration and temperature control are high, and the economic value of ammonium sulfate is low, so as to achieve the effect of large processing process flexibility, avoiding secondary pollution, and large production flexibility
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Embodiment 1
[0047] Embodiment 1: refer to figure 1 The process flow of salt extraction from desulfurization waste liquid is shown
[0048] 1000kg of coke oven gas desulfurization and decyanation waste liquid from sulfur paste (containing about 13% ammonium thiocyanate, 9% ammonium thiosulfate, and 8% ammonium sulfate)
[0049] Step 1: Decolorization and impurity removal: add 1kg of 0.1% (w / w) activated carbon to the desulfurization waste liquid, keep it warm at 100°C for 30 minutes, and then filter to obtain the decolorized filtrate and activated carbon filter cake (the activated carbon filter cake will be sent to a professional recycling enterprise for regeneration treatment ).
[0050] Step 2: Concentrate the decolorized solution under reduced pressure: Concentrate the filtrate of step 1 under reduced pressure at 70°C (vacuum degree 70mmHg) until the specific gravity of the system is 1.24. Stop concentration (water content is 18% (w / w)), and the concentrated The system is kept warm an...
Embodiment 2
[0057] Embodiment 2: refer to figure 1 The process flow of salt extraction from desulfurization waste liquid is shown
[0058] 1000kg of coke oven gas desulfurization and decyanation waste liquid from sulfur paste (containing about 15% ammonium thiocyanate, 6% ammonium thiosulfate, and 9% ammonium sulfate)
[0059] Step 1: Decolorization and impurity removal: add 5kg of 0.5% (w / w) activated carbon to the desulfurization waste liquid, heat it at 80°C for 45 minutes, and then filter to obtain the decolorized filtrate and activated carbon filter cake (the activated carbon filter cake will be sent to a professional recycling enterprise for regeneration treatment ).
[0060] Step 2: Concentrate the decolorized solution under reduced pressure: Concentrate the filtrate of step 1 under reduced pressure at 80°C (vacuum degree 90mmHg) until the specific gravity of the system is 1.22. Stop concentrating (water content is 20% (w / w)). The system is kept warm and transferred to the crysta...
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