Authors: T.G. Cherkasova, I.V. Isakova, A.V. Tihomirova, E.V. Cherkasova

Title of the article: Recycling of spent catalysts for environmental protection

Year: 2021, Issue: 4, Pages: 14-20

Branch of knowledge: 05.17.01 Technology of inorganic substances

Index UDK: 669.054.8

DOI: 10.26730/1999-4125-2021-4-14-20

Abstract: Large-tonnage man-made wastes containing oxides of non-ferrous and rare metals are catalysts of chemical industries that have developed their resource and are not subject to further operation. On the one hand, they are toxic chemical wastes that are not allowed to be buried in the ground, and the accumulation of such wastes leads to a significant deterioration in the environmental situation, on the other hand, these wastes can be a source of valuable metals. At KAO Azot, Kemerovo, catalysts of different compositions are used in almost all industries. In particular, in the stages of ammonia oxidation (nitric acid production) and sulfur oxide (IV) oxidation (sulfuric acid production), platinoid nets and sulfovanadate on diatomite are used, respectively, as catalysts. The article considers options for processing spent catalysts of various chemical industries and proposes the development of new methods and means for their elimination, neutralization and use as production raw materials. The experiment was carried out with the spent vanadium catalyst of the sulphuric acid production of KAO Azot in order to return it to the stage of contacting sulfuric gas. A laboratory sample of a regenerated vanadium catalyst for sulfuric acid production was obtained. Х-ray analysis confirmed the compositions of the products.

Key words: recycling spent catalysts recovery processing molybdenum nickel vanadium platinum group metals rhenium

Receiving date: 15.05.2021

Publication date: 15.09.2021

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