Para acceder a los documentos con el texto completo, por favor, siga el siguiente enlace: http://hdl.handle.net/2117/23522

Valorisation of Ca and Mg by-products from mining and seawater desalination brines for water treatment applications
Casas Garriga, Sandra; Aladjem, Carlos; Larrotcha, Enric; Gibert Agulló, Oriol; Valderrama Angel, César Alberto; Cortina Pallás, José Luís
Universitat Politècnica de Catalunya. Departament d'Enginyeria Química; Universitat Politècnica de Catalunya. SETRI - Grup de Tècniques de Separació i Tractament de Residus Industrials
BACKGROUNDBrines from the drainage of potash mine tailings and from seawater reverse osmosis (SWRO) desalination were previously evaluated as sources of NaCl for the chlor-alkali industry. Valorisation of NaCl as raw material is required to meet the membrane electrolysis specifications of NaCl saturation and control of interferences (Ca, Mg and sulphate). Brines concentration in NaCl was previously achieved for SWRO brines using electrodialysis (ED). In this work, valorisation of Ca and Mg by-products via selective recovery was evaluated.; RESULTSRecovery of Ca(II) and Mg(II) using chemical precipitation with Na2CO3 and NaOH was evaluated at 25 degrees C and 65 degrees C using one single reagent and mixtures of reagents. The excess of reactants needed to achieve the maximum removal efficiency ranged from 0.35 to 14 g L-1 Na2CO3 and 0.85 g L-1 NaOH. Selective concentration of SWRO brines by ED benefited the purification, as it slightly diluted the antiscalants. The increase of temperatures also benefited their removal process.; CONCLUSIONSTotal chemical analysis of Ca and Mg by-products showed the presence of mixed salts of Ca and Mg when Na2CO3 was used and more pure precipitates of Mg when NaOH was used. In both cases, small amounts of minor traces initially present in the brines were found. (c) 2014 Society of Chemical Industry.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria química
Saline water conversion--Reverse osmosis process.
Potash mines and mining
calcium
magnesium
valorisation brines
seawater
potash tailings
REVERSE-OSMOSIS CONCENTRATE
SEAGRASS POSIDONIA-OCEANICA
CALCIUM-CARBONATE
CHLORALKALI INDUSTRY
PRECIPITATION
ELECTRODIALYSIS
PLANT
RECOVERY
SULFATE
IMPACT
Aigua salada -- Dessalatge -- Osmosi inversa
Potassa -- Mines i extracció
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
info:eu-repo/semantics/publishedVersion
Artículo
         

Mostrar el registro completo del ítem

Documentos relacionados

Otros documentos del mismo autor/a

Reig i Amat, Mònica; Casas Garriga, Sandra; Aladjem, Carlos; Valderrama Angel, César Alberto; Gibert Agulló, Oriol; Valero Cervera, Fernando; Miguel Centeno, Carlos; Larrotcha, Enric; Cortina Pallás, José Luís
Bernad, Francesc; Casas Garriga, Sandra; Gibert Agulló, Oriol; Akbarzadeh, Aliakbar; Cortina Pallás, José Luís; Valderrama Angel, César Alberto
Licon Bernal, Edxon Eduardo; Casas Garriga, Sandra; Alcaraz, Aurora; Cortina Pallás, José Luís; Valderrama Angel, César Alberto
Licon Bernal, Edxon Eduardo; Alcaraz Segura, Aurora; Casas Garriga, Sandra; Valderrama Angel, César Alberto; Cortina Pallás, José Luís
Reig i Amat, Mònica; Pagès, Neus; Licon, Edxon; Valderrama Angel, César Alberto; Gibert Agulló, Oriol; Yaroshchuk, Andriy; Cortina Pallás, José Luís
 

Coordinación

 

Patrocinio