Theory Of The Aluminum Catalyst Adsorption Of Nickel And The Recovery Of Nickel From Spent Catalyst

At present, the process of 90% of the international oil refining industry and chemical industry needs the catalyst. According to statistics, China's petroleum and chemical industry each year to replace the hydrocracking catalyst of the amount spent on the more than 100,000 tons, valued at 1.3 billion dollars, of which contain relatively high price of nickel and other metals, from the use of resources and environmental protection, both in terms of its metal recycling and reuse of good economic and environmental benefits.This article mainly from the oil refining waste hydrocracking catalyst for the recovery of nickel, as well as the alumina research and test the secondary vanadium, molybdenum recovery; at the same time the papers of aluminum waste catalyst adsorption, desorption of nickel has made the law basic fundamental research.The major difference between the oil refining waste catalyst containing 2%～3% of nickel, molybdenum, vanadium about 0.1 percent, and the rest mainly Al2O3. This study "from oil-oxidation-acid extraction of nickel-the recovery Al2O3" recovery process in which the nickel, aluminum smelting slag as raw material of aluminum take-away.Experimental study on the de-oiling, oxidative effect of leaching of nickel, vanadium, molybdenum impact, the study found that waste catalyst from oil, oxidation is complete as much as possible about whether this could be leaching from nickel, vanadium, molybdenum play a decisive impact. Through research identified 270℃～400℃between the de-oiling 2h, while access to a certain amount of air, de-oiling rate of more than 95%, and well positioned to capture the recovery of oil pollution, and in 100℃～250℃between the oxidation 4h, oxidation basic completely.Experimental study of the pH value of the simple material solubility, different acid leaching of nickel capacity, different alkali leaching vanadium, molybdenum results, discovery can be used to adjust the pH of different solutions to the separation of vanadium, molybdenum, nickel, and the use of sulfuric acid leaching of nickel and Na2CO3 solution leaching vanadium, molybdenum is more appropriate; Experiments also examined the pH, concentration of sulfuric acid, Na2CO3 solution concentration, liquid-solid ratio, temperature, time for the leaching rate of adding acid pH values between 1 and 2, leaching time of 2h, then more thorough leaching of nickel, and pH=9 with the Na2CO3 solution, liquid-solid ratio of 5:1, leaching temperature to 85℃～90℃appropriate, leaching time of 1.5h, vanadium, molybdenum leaching well.Experimental studies using sulfuric acid leaching of nickel, used in aqueous solution of pH=2 and its reaction to separate the solution, together with wash water, can still enter the nickel solution can be repeated many times to wash out the cleaning of nickel and found that the catalyst for the abolition of soluble nickel with absorption. Freudlish experimental isotherm studied spent nickel catalyst adsorption isotherm, in accordance with further Clapeyron-Clausius equation to obtain the heat absorptionΔH=-1.91kJ·mol-1. Less heat absorption, which determine spent nickel catalyst adsorption is physical adsorption.Finally, get back with extraction of nickel, effectively solved the waste catalyst for the absorption of the soluble nickel problems with the water at least up to extract the nickel.In the extraction of nickel, vanadium, molybdenum post-leaching slag for alumina residue can be used as raw material for alumina industry to make full use of. The ultimate realization of aluminum, nickel separation.In this paper, a comprehensive study of oil refining waste catalyst from the extraction of nickel as well as vanadium, molybdenum and the corresponding process on the basis of the theory, to master the technology of the basic law, has been critical of the conditions, the recovery of nickel-rich means and methods.