A method and device for recycling waste liquid from desulfurization and decyanation of coke oven gas by vacuum carbonate method
A vacuum carbonate, desulfurization and decyanation technology, applied in the field of waste recycling and treatment, can solve the problems of difficult precipitation of sulfide and cyanide, high power consumption, frequent replacement of iron electrodes, etc.
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Embodiment 1
[0059] Vacuum potassium carbonate desulfurization and decyanation waste liquid treatment small test, each batch of treatment capacity is 10L, the total cyanide concentration of the original waste liquid is 9000mg / L, S 2- It is 8000mg / L.
[0060] The desulfurization and decyanation waste liquid is added to the reactor, and phosphoric acid is added until the pH of the reaction end point is 6, and the temperature of the reaction solution is controlled at 40°C. The gas phase obtained by the reaction is mixed with water vapor and then enters the catalytic decomposition tower, where it passes through the iron-cobalt catalyst bed at a temperature of 300°C for catalytic decomposition of hydrogen cyanide, and then burns. Reaction, the gas after oxidation is absorbed by sulfuric acid to obtain sulfuric acid; the liquid phase obtained by the reaction is first added to ozone for oxidation, and the oxidized liquid phase is added to 100 mesh powdered activated carbon for adsorption and remo...
Embodiment 2
[0062] Vacuum sodium carbonate desulfurization and decyanation waste liquid treatment small test, each batch processing capacity is 10L, the total cyanide concentration of the original waste liquid is 10000mg / L, S 2- It is 9000mg / L.
[0063] The desulfurization and decyanation waste liquid is added to the reactor, and phosphoric acid is added until the pH at the end of the reaction is 8, and the liquid phase temperature is controlled at 100°C. The gas phase obtained by the reaction is mixed with water vapor and then enters the catalytic decomposition tower, where it passes through the iron-cobalt catalyst bed at a temperature of 150°C for catalytic decomposition of hydrogen cyanide, and then burns. The gas after combustion is catalytically oxidized with oxygen under the catalysis of a vanadium-containing catalyst Reaction, after oxidation, the gas is absorbed by sulfuric acid to obtain sulfuric acid; the liquid phase obtained by the reaction is first added with hydrogen peroxi...
Embodiment 3
[0065] Vacuum potassium carbonate desulfurization and decyanation waste liquid treatment small test, each batch processing capacity is 10L, the total cyanide concentration of the original waste liquid is 12000mg / L, S 2- It is 8000mg / L.
[0066] The desulfurization and decyanation waste liquid is added to the reactor, and phosphoric acid is added until the pH of the reaction end point is 8, and the temperature of the reaction solution is controlled at 80°C. The gas phase obtained by the reaction is mixed with water vapor and then enters the catalytic decomposition tower, where it passes through the iron-cobalt catalyst bed at a temperature of 200°C for catalytic decomposition of hydrogen cyanide, and then burns. The gas after combustion is catalytically oxidized with oxygen under the catalysis of a vanadium-containing catalyst Reaction, after oxidation, the gas is absorbed by sulfuric acid to obtain sulfuric acid; the liquid phase obtained by the reaction is firstly oxidized by...
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