Study On Reusing The Technology Of Waste Liquid Generated Desulfrization

In2012,fog haze, pm2.5, water pollution become hot topics, people are increasingly demanding on the environment. In recent years,the coking industry is famous for the high pollution, environmental problem has become one of the bottlenecks restricting the development of coking industry, seeking the right methods is urgent tast. Coke oven gas desulfurization method is divided into dry process desulphurization and wet desulphurization, at present, the domestic most coking enterprises to adopt wet desulphurization technology. While wet desulphurization has many advantages,but it is difficult to deal with the desulfurization of liquid discharge. Thiocyanate ions, is contained in the desulfurization liquid, biological inside the water, water will produce bad influence. Desulfurization liquid impurities, more complex nature, not fit for biochemical treatmentthe traditional processing method is the desulfurization liquid direct emissions, or be involved in coal blending back in desulphurization system, to participate in the blending system of desulfurization fluid will be one of the pair of salt into coal product process, effects of coal product quality. The desulfurization liquid treatment is difficult in coking industry.Based on the method of hpf desulfurization technology of desulfurization fluid as the research object, ammonia is absorption source, absorb the of hydrogen sulfide. composite catalyst implements the coke oven gas desulfurization. this method need not plus alkali source, desulfurization with high efficiency, but also can generate the desulfurization liquid.the main ingredients for sulfur in desulfurization liquid are ammonium sulphate and ammonium thiocyanate, and a small amount of pds, suspended sulfur and ammonium hydrogen sulfate, volatilization of ammonia.The desulfurization liquid properties is analysised through the experiment, and desulfurization fluid determination will be studied. Select the desulfurization liquid measuring method of each component,measure the sulfur and ammonium sulfate, ammonium thiocyanate, pds, suspended sulfury, analysis the trend of change.List desulfurization of liquid handling methods, analysis the applicable conditions and unfavorable factors, explore the industrialization process of desulfurizationfluid method,fractional crystallization method is put forward. That is "filtration decoloring and evaporation-crystallization and evaporation crystallization-recycling"method. the process is simple, easy to control reaction conditions, it is industrial desulfurization liquid foundation. By the experimental means, get the control conditions of each step. Find out the best operation method of temperature, pressure, the experiment, design the technological process of this method. Product is the sulfur and ammonium sulfate and ammonium thiocyanate, try to improve the purity of product in order to increase the economic benefits of products. The desulfurization liquid salt recycling technology development, not only for enterprise to bring economic benefits, will also bring good environmental benefits.With the improvement of coking industry environmental protection threshold, enterprise must exhaust purifying the wastewater, enterprise has a long way on energy conservation and emission reduction. At present, the domestic coking industry has been the application of this method.