TY - JOUR
T1 - Remoción de Calcio y Magnesio en Agua de Mar para Mejorar la Concentración de Sólidos en la Descarga de Espesadores
AU - Jeldres, Ricardo I.
AU - Piceros, Eder C.
AU - Valenzuela, Julio A.
AU - ROBLES VASQUEZ, PEDRO ADRIAN
N1 - Publisher Copyright:
© 2019 Centro de Informacion Tecnologica. All rights reserved.
Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.
PY - 2019
Y1 - 2019
N2 - Seawater with reduced amounts of calcium and magnesium was used for increasing the concentration of sediment solids from a mine tailing. The assays were carried out considering a synthetic tailing, composed of quartz and kaolinite, and utilising an anionic flocculant of high molar weight. Seawater produced an efficient behaviour when working at pH < 9. However, at higher alkalinity the solid concentration of the sediment was substantially reduced. Isolating the effect of the main seawater ions it was found that magnesium, and to lesser extent calcium, are responsible for reducing the flocculation efficiency, caused by the formation of MgOH+/CaOH+ complexes and Mg(OH)2 precipitates. For this reason, when using seawater with a reduced amount of calcium and magnesium, it was possible to considerably increase the solids content, offering an effective alternative to operate at highly alkaline conditions.
AB - Seawater with reduced amounts of calcium and magnesium was used for increasing the concentration of sediment solids from a mine tailing. The assays were carried out considering a synthetic tailing, composed of quartz and kaolinite, and utilising an anionic flocculant of high molar weight. Seawater produced an efficient behaviour when working at pH < 9. However, at higher alkalinity the solid concentration of the sediment was substantially reduced. Isolating the effect of the main seawater ions it was found that magnesium, and to lesser extent calcium, are responsible for reducing the flocculation efficiency, caused by the formation of MgOH+/CaOH+ complexes and Mg(OH)2 precipitates. For this reason, when using seawater with a reduced amount of calcium and magnesium, it was possible to considerably increase the solids content, offering an effective alternative to operate at highly alkaline conditions.
KW - Calcium and magnesium
KW - Clays
KW - Seawater
KW - Tailings
KW - Thickeners
UR - http://www.scopus.com/inward/record.url?scp=85074300821&partnerID=8YFLogxK
U2 - 10.4067/S0718-07642019000500291
DO - 10.4067/S0718-07642019000500291
M3 - Article
AN - SCOPUS:85074300821
VL - 30
SP - 291
EP - 298
JO - Informacion Tecnologica
JF - Informacion Tecnologica
SN - 0716-8756
IS - 5
ER -