EP 0821656 A1 19980204 - METHOD FOR TREATING FERROUS SULPHATE
Title (en)
METHOD FOR TREATING FERROUS SULPHATE
Title (de)
VERFAHREN ZUR BEHANDLUNG VON EISENSULFAT
Title (fr)
PROCEDE DE TRAITEMENT DE SULFATE FERREUX
Publication
Application
Priority
- FI 9600198 W 19960412
- FI 951922 A 19950421
Abstract (en)
[origin: WO9633133A1] The invention concerns a method for treating ferrous sulphate for the preparation of ferrous sulphate hydrate usable for chromium reduction in cement manufacture. According to the invention, sulphuric acid containing ferrous sulphate obtained as a side product from titanium dioxide production and which contains at the most appr. 30 % by weight of sulphuric acid, is neutralized with a CaO-containing material, preferably cement, in an amount sufficient to give a pH-value to the end product which is 1.5 to 5, whereby the reaction temperature is allowed to increase to at the most 120 DEG C.
IPC 1-7
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 2111/00112 (2013.01); C04B 2111/1081 (2013.01)
Citation (search report)
See references of WO 9633133A1
Designated contracting state (EPC)
AT BE DE DK ES FR GB GR IE IT NL PT SE
DOCDB simple family (publication)
WO 9633133 A1 19961024; EP 0821656 A1 19980204; FI 100966 B 19980331; FI 951922 A0 19950421; FI 951922 A 19961022
DOCDB simple family (application)
FI 9600198 W 19960412; EP 96910049 A 19960412; FI 951922 A 19950421