Process Of Catalytic Gasification Waste Copper Slag, Copper Slag Experimental Study On The Catalytic Performance

With the development of urbanization in our country,the quantity of municipal solid waste also increases rapidly.At the same time, it leads to some problems, such as: environment pollution, land occupation, resource waste, and also affects people’s healthy. In recent years, gasification and pyrolysis technology constantly used in domestic waste handling process, and become a hot spot in the study of domestic and foreign scholars. Biomass as the main representatives of urban living garbage is researched because of its higher composition in living garbage. In the Biomass gasification process of pyrolysis, the generation of tar is one of the key technical problems, so we urgently need to find a kind of catalyst to improve the conversion of tar. Olivine is one of the commonly used, cheap,wear resistance catalysts in biomass gasification process.Copper as one of industrial waste which is produced in copper smelting has the very similar composition as olivine, and its mian mineralogy is2FeO·SiO2. Fe3O4and Ca(Fe, Mg)(SiO3)2.This subject puts forward solutions to put copper slag on the modified treatment, and the activity of biomass catalytic gasification with the modified copper slag is verified by using different analysis means.At first, the TG experiment of copper slag was made at air atmosphere,meanwhile, the kinetic analysis was made with Popescu method. It indicated that the best kinetic model was third-order chemical reaction, the differential expression of mechanism function was f(a)=2(1-a)3, the integral expression was G(a)=[(1-a)-2-1]/2, activation energy was16.8KJ/mol.Secondly, modified experiment of copper slag is carried out. Determind the experiment conditions by means of TG, XRD, and SEM/EDX:the flux of oxygen gas was50ml/min, and the temperature of experiment was800℃、850℃、900℃、950℃. The results show that at the same time with calcination temperature increased the growth rate of copper slag higher. At the same temperature with the extension of calcination time the growth rate first increased and then decreased.The peak value respectively appear at800℃、850℃、900℃calcined180min and950℃calcined60min. The growth rate increasing with the decreasing of particle size. And with the increasing of oxygen partial pressure, the growth rate disappeared.Thirdly, techniques such as XRD、SEM、BET、H2-TPR、TG、FT-IR、GC-MS analysis are used to understand effects of pre-calcination on catalytic activity of copper salg. The formation of Fe3O4and Fe2O3is due to the extrusion of iron from the fayalite in copper slag during pre-calcination, but severe segregation of iron is found to be uniform. With the increasing calcination temperature and prolonging of time, the characteristic peaks of fayalite is gradually weakened and then disappeared, the characteristic peaks of hematite increased, while the characteristic peaks of magnetite is present a trend of first increased and then decreased, and the free iron oxides formed on the surface of copper salg is increased. With the extension of calcination time, the characteristic peak of fayalite is disappeared, the characteristic peaks of SiO2and Fe2O3increased, and the characteristic peaks of magnetite weakened. Effects of pre-calcined copper salg on gasification characterization were investigated in self-build experimental apparatus used for biomass gasification tests. Analysis syngas with GC and analysis tar with FTIR and GC-MS. The result is that with the catalyst of copper slag,the CO and H2content increased. Increased from19.61%.32.55%to21.35%,36.89%respectively. The result of the FTIR and GC-MS show that the types of functional groups and the intensity of corresponding absorption peaks of tar changed a lot with the catalyst precalcination copper slag. It can be inferred that precalcination copper slag acts as catalyst in the air gasification experiment of biomass.Finally, in the process of municipal solid waste gastification, harmful gas such as SO2was produced. The copper slag poisoning with S was studied by employing the Gibbs tree energy minimization principe of the thermodynamics non-homogeneous reaction system. The results show that in the process of catalyst SO2poisoning, generate Fe2(SO4) compounds, which result in permanent poisoning. Should be improve the reaction temperature properly.