Abstract
Utilization of used contact masses from the oxidation state of sulfur(IV) oxide to sulfur(VI) oxide The research was conducted to determine the influence of the urea concentration in the leaching solutions on the efficiency of recovery of vanadium and iron compounds from the used vanadium catalyst from the node of oxidation of sulfur dioxide to sulfur trioxide.
Highlights
Vanadium catalysts working under the industrial conditions are deactivated due to the changes occurring in their structure and texture[1,2,3,4,5]
The results of the analyses of the solutions, revealing the effect of urea concentration in the leaching solution on the recovery ratio of vanadium and iron compounds are presented on Figures 1 and 2
The recovery ratio of vanadium and iron compounds were calculated to the excess of V2O5 – 5% and Fe2O3 – 1.65% in the spent vanadium catalyst
Summary
Vanadium catalysts working under the industrial conditions are deactivated due to the changes occurring in their structure and texture[1,2,3,4,5]. Withdrawn from the process, they pile up on the factory waste dumps of the concrete silos. These catalysts, subjected to the atmospheric conditions, generate the acidic reflux, harmful for the surrounding ecosystems due to the high levels of toxic substances. The used catalysts constitute the chemically and granulometrically heterogeneous material. The composition of these catalysts strongly depends on the conditions of their usage, the source of sulfur dioxide, as well as the conditions of their storage after withdrawal from the process.
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