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在美國化學學會期刊《表麵化學》上刊登了一則消息,有研究者報告稱發現了一種全新技術,能夠更有效地從岩石與礦石中分離金.銀.銅與其他有價值的材料.那是使用納米粒子來抓住這些材料,並使它們附著到磁選機中的氣泡上.據羅伯特·頗爾頓等人解釋,每年他們公司使用一種稱為泡沫磁選的技術來處理大約 4.5億噸的礦山廢石.這個過程包括將礦山廢石粉碎成小顆粒,然後使顆粒漂流在水中以便從廢石中分離出在商業上有價值的顆粒.水中的“磁選劑”能夠附著到貴重金屬顆粒上,使它們與水相斥,並上升到冒泡的水麵,從而輕易地被撈走.
研究者們在刊物上展示了這種由斥水性納米粒子組成的新型的磁選劑技術.在實驗室實驗中,利用玻璃珠來模擬真實的礦物粒子,他們證明,這種納米粒子能如此牢固地附著在玻璃珠上,以至於磁選產生近乎百分之百的回收率.
