Method for preparing basic nickel nitrate and basic aluminum nitrate with spent catalyst

Abstract

The invention relates to a method for preparing basic nickel nitrate and basic aluminum nitrate with a spent catalyst. The method comprises the following steps: carrying out reaction of a hydrofined spent catalyst and dilute nitric acid in a corrosion-resistant reactor according to the pure mass ratio of 1:4.07-4.47 to generate mixed solution of nickel nitrate and aluminum nitrate, simultaneously, releasing hydrogen, and then receiving the hydrogen for hydrogenation; filtering to obtain clear mixed solution of the nickel nitrate and the aluminum nitrate and a small number of impurities (filter cakes); and feeding the obtained clear mixed solution of the nickel nitrate and the aluminum nitrate into a pressure-reducing distillatory for reduced pressure distillation, when saturated solution is obtained through evaporation, discharging the saturated solution into a cooler for cooling crystallization, then separating out aluminium nitrate nonahydrate and nickel nitrate hexahydrate in sequence according to different melting points, and then obtianing the basic nickel nitrate crystal and the basic aluminum nitrate crystal after washing, heating, crystallization water removing, crushing and packaging. The basic nickel nitrate and the basic aluminum nitrate are prepared by taking the spent catalyst as the raw material, and the method changes waste into valuable thing and further creates the considerable economic benefit.

Description

technical field [0001] The invention relates to the technical field of treatment and comprehensive utilization of waste catalysts in petroleum organic chemical industry, in particular to a method for preparing basic nickel nitrate and basic aluminum nitrate with waste catalysts. Background technique [0002] At present, the annual consumption of petroleum refining catalysts in the world is more than 400,000 tons, of which cracking catalysts account for about 86%, and hydrorefining catalysts account for 12%. The cracking catalyst is mainly composed of sialonite, and the particle size is 20-200 microns. During the fluidized catalytic cracking process, part of the deactivated catalyst cannot be recovered because the particles are too fine to enter the atmosphere with the tail gas. An oil refinery with an annual output of 3 million tons can discharge nearly 1,000 tons of catalytic cracking gas particles into the atmosphere every year. Because crude oil contains certain heavy me...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to process and comprehensively utilize the spent catalysts used in hydrogenation and refining by the high-pressure hydroxyl synthesis method to prepare basic nickel nitrate and basic aluminum nitrate, and to provide a method for preparing basic nickel nitrate and basic aluminum nitrate with waste catalysts. The method of formula aluminum nitrate, this method effectively controls the pollution of waste catalyst, and at the same time turns waste into treasure, and produces nickel series products, which not only creates economic value, but also eliminates the pollution of waste catalyst to the environment and protects the environment