METHOD FOR PRODUCTION OF CATALYZERS FOR CONVERTINGMETHOD FOR PRODUCTION OF CATALYZERS FOR CONVERTING SO2 INTO SO3 USING WORKED-OUT VANADIUM CATALYZERS SO2 INTO SO3 USING WORKED-OUT VANADIUM CATALYZERS

摘要

The invention relates to the production of catalyzers for converting SO2 into SO3 using worked-out vanadium catalyzers. The method consists of leaching active components in pulp, their separation from solid residue by filtration, the treatment of the filtrate and the residue, its mixing with the active components of the filtrate the introduction ofcomponents of a fresh contact mass, and drying and forming. The aim is to increase the utilization of the worked-out catalyzer while maintaining its high performance characteristics. To this end the residue is treated after filtration with an alkali solution with a mole ratio SiO2(KiO+Na2O)-V205 of 2.5 to 29.8, with a subsequent co-precipitation of SiO and V2O5 with the help of the filtrate or sulphuric acid. V2O5 can be precipitated from the filtrate with the help of the alkali and then used for mixing with the active components. In the degree of extraction of SiO2 is equal to 1.0, the worked-out vanadium catalyzer can be used without being crushed.