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首页> 外文会议>International Congress on Water Management in Mining >(Chapter4)A Novel Use of Carbon Dioxide in Seawater Treatment for Flotation of Cu-Mo Sulfide Minerals
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(Chapter4)A Novel Use of Carbon Dioxide in Seawater Treatment for Flotation of Cu-Mo Sulfide Minerals

机译：（第4章）铜硫化物矿物质浮选中的海水处理中二氧化碳的新用途

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Chile is the largest producer of copper (Cu)and third largest of molybdenum (Mo)among others. The majority of mining activities are located in the north of Chile, where the water resources are scarce for current and future mining operations. Therefore, seawater is considered as a key alternative to replace fresh water. The low metallurgical quality is a problem when seawater is used in the concentration of Cu-Mo sulfide ores. The presence of calcium (Ca~(~(2+)))and magnesium (Mg~(~(2+)))ions, decreases the recovery of Cu-Mo ores. Furthermore, themoelectrics supply electricity to mining operation. These use coal as fossil fuels, which generates large amounts of carbon dioxide (CO_2(g))to atmosphere. This document presents a methodology based on experimental tests to remove calcium and magnesium species from seawater with CO_2(g)and NaOH as alkalizing agent. The experimental tests were performed at pH 10 and 10.5 without CO_2(g)and then with doses of 70 ml and 210 ml of CO_2(g). Furthermore, the effect of the combination of NaOH and Na_2CO_3 at pH 10.5 with CO_2(g)and without was evaluated. The results showed that the removal of Ca~(2+)and Mg~(2+)at pH 10.5 is greater than at pH 10. At pH 10.5 with NaOH and without CO_2(g)the Ca~(2+)and Mg~(2+)removal were 11.82% and 31.37% respectively, while with 210 ml of CO_2(g)were 31.37% and 70% respectively. Furthermore, the combination of NaOH and Na_2CO_3 allowed remove 79.94% of Ca~(2+)and 31.30% of Mg~(2+)without injection of CO_2(g), while with 210 ml of CO_2(g)the Ca~(2+)removal was 88% and Mg~(2+)removal was 40%. Therefore, the results indicate that CO_2(g)is able to precipitate Ca~(2+)and Mg~(2+)from seawater. Could be the first step to develop a technology that promote the partial desalination to improve the recovery of Cu-Mo ores and reduce CO_2(g)emission.
机译：智利是最大的铜（Cu）和第三大钼（Mo）中的生产商。大多数采矿活动位于智利北部，水资源对当前和未来采矿业务稀缺。因此，海水被认为是更换淡水的关键替代品。冶金质量低是一种在海水中用于Cu-Mo硫化物矿石浓度的问题。钙的存在（Ca〜（〜（2 +））和镁（Mg〜（〜（2 +））离子，降低了Cu-Mo矿石的回收。此外，主电气供电到采矿操作。这些使用煤作为化石燃料，它产生大量二氧化碳（CO_2（G））到大气。本文献介绍了基于实验试验的方法，以将来自海水的钙和镁物种与CO_2（g）和NaOH作为碱化剂除去。实验试验在没有CO_2（g）的情况下在pH10和10.5处进行，然后用70ml和210ml CO_2（g）的剂量。此外，用CO_2（g）和没有的NaOH和Na_2CO_3在pH10.5中的组合的影响。结果表明，在pH10.5的pH 10.5下除去Ca〜（2+）和Mg〜（2+）大于pH10.在pH1.5，NaOH和没有CO_2（g）的Ca〜（2+）和Mg除去〜（2+）分别为11.82％和31.37％，而210ml CO_2（g）分别为31.37％和70％。此外，NaOH和Na_2CO_3的组合允许除去79.94％的Ca〜（2+）和31.30％的Mg〜（2+），而不注入CO_2（g），同时用210ml CO_2（g）Ca〜（ 2+）除去为88％，Mg〜（2+）除去40％。因此，结果表明CO_2（G）能够从海水中沉淀Ca〜（2+）和Mg〜（2+）。可以成为开发一种促进部分脱盐的技术的第一步，以改善Cu-Mo矿石的恢复并减少CO_2（G）排放。

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