|
The research mills red mud and Soda white clay composite preparation desulfurizer removal of H2S in the gas. The desulfurization agent purification efficiency, simple preparation process, less energy consumption, and the regeneration method is simple, has a certain potential for research and development. H2S is a hazardous substance caused by corrosion, not only for the transport piping, equipment, etc., affect the subsequent processing (such as lead poisoning of the catalyst), and a serious threat to personal safety, is one of the sources of pollution must be controlled. Red mud and lime mud drying crushing and screening, add a small amount of additives, molding desulfurizer made with a certain mechanical strength, in a fixed bed reactor gas desulfurization activity assessment. By examining the red mud and white mud ratio, additive and preparation Desulfurization performance, further improve the desulfurizer preparation process, to improve the sulfur capacity; verify the composition of the desulfurizer was characterized by XRD, in-depth study desulfurization mechanism. The results of the analysis of the content of the ingredients: 66.57% of the total amount of iron oxide with Qingdao Steel red mud, containing part of CaCO3, MgO and other alkaline substances; and Qingdao Soda the Pak Nai containing CaCO353.21%. The red mud Pak Nai, screening additives, and optimize various process parameters, obtained the best performance of the desulfurization agent to prepare the best formula: the main content of raw materials accounted for 90% of the additive content of 10%. The best ratio of the main raw material for red mud: the Pak Nai = 2:1 (wt%), red mud 60%, Pak Nai 30%. The main raw material crushing the more detailed the better. The binder additives - Na; pore-forming agent - ZA; lubricants, - R. Add appropriate amount of water and mix in accordance with the above-mentioned preferred composition and content of the desulfurization agent, the extrusion molding using the extrusion machine, diameter ? 3mm, length 2 to 5cm. Oven 110 ° C for 6h drying; muffle furnace calcination temperature of 600 ° C. The calcination time at 6h desulfurization effect is best. Examines the best the desulfurization reaction conditions, the results showed that: desulfurizer in a low-temperature reaction effect, the temperature range of 50 to 70 ° C, the desulfurization effect is very good; reaction temperature is too high or too low will affect the reaction ; airspeed desulfurization effect is also a great 400 to 1200h-1 airspeed within the desulfurization desulfurization agent in the smaller space velocity response the better; the analog gas in water content desulfurization effect, including Too much water, too little adverse effect of desulfurization optimum moisture content of 7.28%; gas containing O2 have a greater impact on the desulfurization effect, more industrial gas O2 content within the limits of, the O2 amount of more, the desulfurization effect is more reaches its maximum value when the O2 content of 2%. Optimum conditions: temperature: 50 ° C, H2O content: 7.28% O2 content: 2%, 400h-1, the sulfur capacity can reach 25.3%. XRD characterization showed that the desulfurization agent is prepared when 600 ° C calcination so that the raw material in the FeO, Fe3O4 Fe2O3 to the active transition; within a temperature range of 30 ~ 110 ° C, and the reaction temperature is lower, the more favorable the desulfurization reaction. In this paper, steel mills red mud and Soda Pak Nai flue gas desulfurization removal of gas in H2S experiments confirmed that the desulfurization effect is very good. The subject of \
|