نوع مقاله: مقاله پژوهشی

نویسندگان

1 معاونت پژوهشی دانشگاه صنعتی امیرکبیر

2 دانشجوی دکتری فرآوری مواد معدنی دانشگاه صنعتی امیرکبیر

چکیده

با توجه به رشد سریع جمعیت و توسعه صنایع مختلف، میزان آب تازه به سرعت در حال کاهش است به طوری که در کشورهای خشک مانند ایران، به یک عامل حیاتی، تبدیل شده است. فرآیند فلوتاسیون یکی از روش های اصلی فرآوری مواد معدنی است که در محیط های آبی انجام می گیرد و حجم وسیعی از آب را مصرف می کند. هدف از مقاله حاضر بررسی استفاده از آب دریا در فلوتاسیون کانه های سولفیدی مس- مولیبدن و مقایسه نتایج آن با آب تازه است. نمونه مورد مطالعه از خوراک وروی به سلول های رافر واحد تغلیظ 2 مجتمع مس سرچشمه تهیه شده است. آزمایش های فلوتاسیون در شرایط مختلف در آب تازه و آب دریا انجام گردید و بازیابی های مس، مولیبدن و آهن تعیین شد. نتایج نشان داد که بازیابی مس در آب تازه و آب دریا در pH های مختلف روند مشابهی داشته است ولی بازیابی مولیبدن در pH بالای 5/9 به شدت کاهش یافت. کاهش بازیابی مولیبدن به دلیل ترسیب هیدروکسید منیزیوم است که در pH های بالاتر از 5/9 اتفاق می افتد. بنابراین فلوتاسیون مرسوم مس مولیبدن (pH بالای 11) زمانی که پیریت در محیط زیاد باشد درصورت استفاده از آب دریا با مشکل جدی مواجه خواهد شد

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

The use of seawater in copper and molybdenum flotation

چکیده [English]

Nowadays, seawater usage in mineral processing has become a fairly topical issue. Due to rapid population growth and industrial development, the amount of fresh water is decreasing rapidly, so that fresh water is a critical component, especially in many industrialized arid countries, such as Iran. One of the main methods of mineral processing is flotation process that occurs in aquatic environments and consumes large volumes of water. The purpose of this paper was to investigate the use of sea water in the Cu-Mo ores froth flotation. In the experimental work, seawater was utilized as process water in the laboratory rougher flotation tests and compare the results with fresh water. The ore sample was porphyry Cu-Mo ore, which was delivered from Sarcheshmeh Copper complex. Results show that recovery of copper maintained almost the same level in both mediums. However, lime consumption was observed to be increased significantly under flotation conditions in seawater. In addition, the floatability of molybdenum was affected negatively above the pH 9.5-10. Recovery reduction of molybdenum was suggested to occur due to the magnesium hydroxide complexes and magnesium hydroxide precipitates, which began to form in seawater in higher pH levels. The experimental work showed that the conventional flotation of Cu-Mo ore conducted in seawater has serious conflicts, when pyrite is depressed with lime.

کلیدواژه‌ها [English]

  • Sea water
  • Flotation
  • pH
  • Recovery
  • copper
  • molybdenum

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