Method of making an iron oxidechromium oxide catalyst

摘要

The Abstract of the Invention is a method of making a solution of the nitrates of iron and chromium from a spent catalyst containing oxides of iron and chromium, which method comprises: (a) dissolving the catalyst in sulphuric acid; (b) reacting the resulting sulphates solution with a source of nitrate ions and of cations of which the sulphate is of low solubility, whereby to precipitate such sulphate; (c) separating the sulphate, whereby to give a nitrates solution of low sulphate content.