METHOD FOR CONTINUOUSLY PREPARING METAL OXIDES CATALYST AND APPARATUS THEREOF

摘要

A method for continuously preparing metal oxides catalyst comprises the following steps: dissolving metal materials using nitric acid solution to produce a metal nitrates solution, at the same time produce NOx and water vapor; hydrolyzing the metal nitrates solution by introducing pressurized superheated water vapor into the metal nitrates solution to obtain a metal oxide hydrates slurry as well as sour gases, the major constituents of the sour gases are NO2 , NO, O2 and water vapor; filtrating and drying the slurry to obtain metal oxide hydrates and / or metal oxides; and then utilizing the obtain metal oxide hydrates and / or metal oxides as raw material and preparing the metal oxides catalyst by the conventional method for preparing a catalyst. The NOx gases produced can be absorbed to produce nitric acid which can be reused. An apparatus used for preparing metal oxides comprises a metal nitrates solution preparation system, a metal nitrates solution hydrolysis system, a product preparation system and a nitric acid preparation and reuse system. The method and the apparatus can achieve continuous production, inclosed circulation and zero release in the whole process and can reduce the cost of production.