Research On The Harmless Treatment And Resource Utilization Technology Of FCC Spent Catalyst

FCC waste catalyst is a kind of hazardous solid waste with complex composition,wide sources and large emissions.The high content of heavy metals in the waste catalyst will pose a serious threat to the surrounding environment and human health.It is a difficult point for solid waste disposal.In the"National List of Hazardous Wastes"promulgated on August 1,2016,FCC waste catalysts are classified as HW50 hazardous wastes,which cannot be directly buried and discarded and need to be disposed of in time.In this paper,according to the characteristics of FCC waste catalysts,an experimental study on the harmless treatment and resource utilization of waste catalysts was carried out.In this paper,a series of experimental analysis methods（SEM,XRD,XRF,BET,etc.）were used to characterize the surface structure,heavy metal element composition,content and distribution of FCC waste catalysts.The characteristics and deactivation mechanism of spent catalyst.In this paper,the high temperature melting method is used to harmlessly treat FCC waste catalysts.The effects of flux,adding ratio,heat treatment temperature and time on the harmless treatment of spent catalyst were investigated.The research results show that the treatment of spent catalyst with high temperature melting method can effectively achieve the immobilization of heavy metals Ni and V.When the addition ratio of flux Si O₂ is 20%,the heat treatment temperature is 1000℃,and the heat treatment time is 2h,the fixing rate of heavy metals Ni and V reaches 99%.The increase of temperature and time will increase the degree of fixation of heavy metals Ni and V.In this paper,the solidification and stabilization method is used to harmlessly treat FCC waste catalysts.The effects of different chemicals and addition ratios on the harmless treatment of waste catalysts are investigated.The results show that after the spent catalyst has been treated with five chemical agents,the leaching concentrations of heavy metals Ni and V are lower than the blank leaching concentration.When the added mass fraction of water glass is 4%,the stabilization degree of heavy metals Ni and V rises rapidly,and the stabilization rate reaches more than 95%.When optimizing the dosage of reagents,the advantages and disadvantages of the five reagents are as follows:lime>artificial zeolite>water glass>potassium ethylxanthate>dicalcium phosphateIn this paper,FCC waste catalyst is used in conjunction with ozone catalytic oxidation to treat refractory amine-containing wastewater.The results of the study show that:the direct use of FCC waste catalyst for adsorption and removal of organic matter in waste water is very poor;as the amount of waste catalyst is increased,the effect of ozone oxidation of amine-containing wastewater is significantly increased;under neutral or alkaline conditions,the active group on the waste catalyst The branch will promote ozone decomposition,increase the concentration of ozone in the liquid phase,and speed up the oxidation reaction rate;appropriately increasing the reaction temperature can reduce the activation energy of the reaction system,which is conducive to the oxidation reaction,but too high a temperature will reduce the solubility of ozone and affect the production of ozone decomposition.OH;Compared with industrial ozone catalyst,FCC waste catalyst has the best catalytic effect;FCC waste catalyst has poor catalytic activity after curing and stabilization treatment,and the waste catalyst of water glass treatment has no catalytic activity,which is equivalent to the ozone oxidation treatment of wastewater.Through GC-MS spectrum analysis,the concentration of organic compounds in wastewater containing amines was significantly reduced,effectively purifying wastewater.Through the analysis of COD degradation kinetics of amine-containing wastewater,under the conditions of different initial p H,temperature and catalyst addition,ozone catalytic oxidation treatment of amine-containing wastewater is in line with the apparent first-order reaction kinetics.