Method for processing iron-laden spent sulfuric acid
AssigneeTronox Pigments GmbH
InventorsGerhard Auer, Berndt-Ullrich Köhler, Benno Laubach
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Abstract
The invention concerns a method for processing heavy metal-laden spent sulfuric acid. For this, iron-laden spent sulfuric acid or iron-laden sulfuric materials obtained therefrom are reacted with a material that contains iron chloride and optionally other metal chlorides, producing iron (II) sulfate. The spent sulfuric acid preferably derives from titanium dioxide production.
Claims21
A method of processing iron-laden spent sulfuric acid or iron-laden sulfuric acid materials obtained therefrom, comprising the steps of reacting the spent sulfuric acid or sulfuric acid material with a material that contains iron chloride, and optionally other metal chlorides, whereby iron(II) sulfate is obtained, characterized in that the concentration of iron ions in the iron-laden spent sulfuric acid or in the iron-laden sulfuric acid material obtained therefrom is in the range of 2 to 22 weight %.
The method according to 1, characterized in that either the iron chloride-containing material or the iron sulfate containing material is reduced in acidity prior to being reacted, or the product of the reaction is reduced in acidity, by adding metallic iron or iron oxides, or both, thereby increasing the iron concentration.
Dependencies are inferred from the claim text.