Reducing agent for the soluble chromate content of cement and methods for production thereof
AssigneeCrenox GmbH
InventorsMichael Vössing, Auer Gerhard, Benno Laubach, Detlef Klein, Werner Schuy, Klaus Köllisch, Erwin Weiss, Werner Bahl, Philip Reese
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Abstract
The invention relates to a reducing agent for the soluble chromate content of cement and to methods for the production thereof, which comprise concentrating an used sulfuric acid, containing iron (II) sulfate, and separating the sulfuric acid from the obtained precipitate which contains iron (II) sulfate.
Claims14
A method of reducing soluble chromate content in cement comprising mixing the cement with an iron (II) sulphate monohydrate-containing reducing agent comprising an iron (II) sulphate monohydrate-containing precipitate, which is produced by concentrating an iron (II) sulphate monohydrate-containing used sulphuric acid and separating the sulphuric acid from the obtained precipitate, and the precipitate having a titanium content of 5 to 15% by weight, based on iron.
Dependencies are inferred from the claim text.