EP 1833764 A1 20070919 - METHOD FOR THE REDUCTION OF THE SOLUBLE CHROMATE CONCENTRATION IN CEMENT, AND PREPARATION COMPRISING CEMENT AND WATER-SOLUBLE METAL SULFATES
Title (en)
METHOD FOR THE REDUCTION OF THE SOLUBLE CHROMATE CONCENTRATION IN CEMENT, AND PREPARATION COMPRISING CEMENT AND WATER-SOLUBLE METAL SULFATES
Title (de)
VERFAHREN ZUR REDUKTION DES LÖSLICHEN CHROMATGEHALTES IN ZEMENT SOWIE EINE ZUBEREITUNG AUS ZEMENT UND WASSERLÖSLICHEN METALLSULFATEN
Title (fr)
PROCEDE DE REDUCTION DE LA TENEUR EN CHROMATE SOLUBLE DANS DU CIMENT ET PREPARATION COMPOSEE DE CIMENT ET DE SULFATES METALLIQUES SOLUBLES DANS L'EAU
Publication
Application
Priority
- EP 2005012769 W 20051130
- DE 102004059047 A 20041207
Abstract (en)
[origin: WO2006061127A1] The aim of the invention is to create an iron (II) sulfate-containing reducing agent which is to be used especially for reducing the chromate concentration in cement as well as a suitable method for producing said reducing agent. Said aim is achieved by a method for producing an iron(II) sulfate-containing reducing agent, according to which iron(II) sulfate-containing salts are crystallized from an iron(II) sulfate-containing sulfuric acid, and the obtained suspension (thick sludge) that comprises the iron(II) sulfate-containing salts and the sulfuric acid is reacted directly with iron and/or one or several iron compounds so as to obtain the iron(II) sulfate-containing reducing agent without separating the sulfuric acid from the iron(II) sulfate-containing salts.
IPC 8 full level
C01G 49/14 (2006.01); C04B 22/14 (2006.01)
CPC (source: EP)
C01G 49/14 (2013.01); C04B 22/149 (2013.01); C04B 28/02 (2013.01); C04B 40/0039 (2013.01); C04B 2111/1081 (2013.01)
Citation (search report)
See references of WO 2006061127A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
DE 102004059047 A1 20060608; DE 102004059047 B4 20071031; EP 1833764 A1 20070919; WO 2006061127 A1 20060615
DOCDB simple family (application)
DE 102004059047 A 20041207; EP 05813617 A 20051130; EP 2005012769 W 20051130