The impact of seawater with calcium and magnesium removal for the flotation of copper-molybdenum sulphide ores

被引：80
|
作者：
Jeldres, Ricardo I. [1 ]
Arancibia-Bravo, Maria P. [1 ]
Reyes, Arturo [3 ]
Aguirre, Claudia E. [1 ,2 ]
Cortes, Lorena [2 ]
Cisternas, Luis A. [1 ]
机构：
[1] Univ Antofagasta, Dept Chem Engn & Mineral Proc, Antofagasta, Chile
[2] CSIRO, Chile Int Ctr Excellence, 2827 Apoquindo St,12th Floor, Santiago, Chile
[3] Ctr Invest Cient Tecnol Mineria CICITEM, Antofagasta, Chile
来源：
MINERALS ENGINEERING | 2017年 / 109卷
关键词：
Calcium and magnesium removal; Copper-molybdenum sulphide ores; Seawater flotation; FLOATABILITY;
D O I：
10.1016/j.mineng.2017.02.003
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
The use of seawater in the flotation of copper-molybdenum sulphide ores is becoming increasingly important. However, the complex chemistry by the presence of calcium and magnesium hydroxyl-complexes interferes with the recovery of molybdenite. This study analyzes the impact of pre-treated seawater with calcium and magnesium removal on the floatability of copper-molybdenum sulphide ores. The pretreatment was carried out by a mixture of Na2CO3 and CaO, which promotes the precipitation of calcium and magnesium ions. Three different conditions were compared, (i) flotation in seawater at pH 11.5; (ii) flotation in pretreated seawater with calcium and magnesium removal at pH 11.5; and (iii) flotation in seawater at natural pH, i.e. pH approximate to 7.6. While the copper recovery was similar in all cases, the recovery of molybdenum at high alkaline condition was notably increased when seawater harness was reduced. On the other hand, a high pyrite depression was reached because the oxidizing atmosphere at pH 11.5 allows Fe(OH)(3) formation. (C) 2017 Elsevier Ltd. All rights reserved.
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页码：10 / 13
页数：4
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