Extraction method to remove chloride ion in desulfurization wastewater of coal-fired power plant.

Aiming at the high concentration of Cl in the desulfurization wastewater of coal-fired power plants, which does not meet the requirements of reuse, using liquid-liquid extraction to study the removal of Cl" in the desulfurization wastewater. The effects of factors such as the type of extractant, the composition ratio of the extract, the volume ratio of the extract to the water phase the initial pH of the wastewater, the extraction temperature, and the type of stripping agent have been systematically investigated on the Cl removal efficiency. Under suitable conditions, the results show that when the volume ratio of N235, modified preparation, and diluent in the extract is 7-2: 1, 0/ A ratio is 1- 4, extraction time is 2 min, pH =4, and 25 °C ( normal temperature ), after three repeated experiments of cross-flow extraction, the Cl concentration in the desulfurization wastewater can be reduced from 12 396 mg/L to 1 000 mg/L, and the removal rate can reach 94% ; The back extraction volume ratio 0/A is 12: 1, after the repeated experiment of the secondary cross-ffow back extraction of ammonia water, the back extraction efficiency can reach more than 65% . [ABSTRACT FROM AUTHOR]