A Study On The Resourceful Treatment Of Desulfurization Waste Liquid Of Coke Oven Gas

The wet catalytic oxidation desulfurization technology was a kind of method which wasusually used coke oven gas desulfurization，because of it exist some side reaction, part ofdesulfurization waste liquid need to be poured regularly. The desulfurization waste liquidcontains a lot of by-products. The direct discharge not only pollutes the environment, also cancause the waste of resources. In this paper, the desulfurization waste liquid was analyzed,obtained three kinds of salt (NH4)2S2O3, NH4SCN,(NH4)2SO4in the waste liquid of highconcentration, with a high recycling value. However, due to the solubility of (NH4)2S2O3andNH4SCN in water are relatively large and too close, it is difficult to directly use thecrystallization method to be recycled.To counter this problem, this paper is adopted in a newtype of catalys, utilize oxygen in the air to study the Catalytic conversion experiments on(NH4)2S2O3and successfully converted it into (NH4)2SO4. Waste only remain (NH4)2SO4andNH4SCN that with large solubility difference.Studing on the catalyst conversion ratio of(NH4)2S2O3in waste solution.The influence of the different catalyst, different temperature,thequantity catalyst, the concentration of solution initial, and the air flow were investigated. Theresults indicated solution whose concentration was90g/Land temperature was90℃waschanged more than98%by0.25g catalyst. The solubility of (NH4)2S2O3is very small indesulfurization wast liquid, but NH4SCN is easily dissolve in the waste. So this experimentuse evaporative crystallization to recover NH4SCN and (NH4)2SO4. The purity of NH4SCNcan achieve industrial standards.