EP 2934760 A1 20151028 - METHOD FOR SEPARATING CALCIUM CARBONATE AND GYPSUM
Title (en)
METHOD FOR SEPARATING CALCIUM CARBONATE AND GYPSUM
Title (de)
VERFAHREN ZUR TRENNUNG VON CALCIUMCARBONAT UND GIPS
Title (fr)
MÉTHODE DE SÉPARATION DE CARBONATE DE CALCIUM ET DE GYPSE
Publication
Application
Priority
- FR 1262309 A 20121219
- EP 2013077062 W 20131218
Abstract (en)
[origin: WO2014095980A1] The invention relates to a method for separating a suspension containing gypsum granules and calcium carbonate granules and an aqueous solution, characterized in that the aqueous solution comprises at least one sodium salt and in that the aqueous solution has a sodium ion concentration of at least 3 g/l and in that said method comprises a step of separation by floatation using a collector for the gypsum granules, wherein the collector comprises at least one heteropolar organic surfactant of formula RX, in which: - R denotes a hydrocarbon-based chain comprising from 2 to 50 carbon atoms, and the hydrocarbon-based chain is chosen from: a saturated or unsaturated, linear alkyl chain and a saturated or unsaturated, branched alkyl chain, - X denotes at least one ionizable group chosen from the group consisting of: a carboxylic group, a sulfonate group, a sulphate group, a phosphonate group, or a phosphate group, or a hydroxamate group.
IPC 8 full level
B03D 1/00 (2006.01)
CPC (source: EP US)
B03D 1/00 (2013.01 - EP US); B03D 1/006 (2013.01 - US); B03D 1/008 (2013.01 - EP); B03D 1/01 (2013.01 - EP); B03D 1/012 (2013.01 - EP US); B03D 1/014 (2013.01 - EP US); B03D 1/02 (2013.01 - EP US); B03D 2201/02 (2013.01 - EP US); B03D 2203/02 (2013.01 - EP US)
Citation (search report)
See references of WO 2014095980A1
Citation (examination)
US 2340613 A 19440201 - CLINTON PERKINS EXRA
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
FR 2999455 A1 20140620; FR 2999455 B1 20160715; CN 105307774 A 20160203; CN 105307774 B 20180223; EP 2934760 A1 20151028; US 2015328645 A1 20151119; WO 2014095980 A1 20140626
DOCDB simple family (application)
FR 1262309 A 20121219; CN 201380072243 A 20131218; EP 13811473 A 20131218; EP 2013077062 W 20131218; US 201314652963 A 20131218