Enrichment of Ni and Fe from nickel laterite by calcination,hydrogen reduction and magnetic separation
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摘要: 對印尼紅土鎳礦的基礎特性進行了系統的研究,發現礦石主要由蛇紋石和輝石組成,其中Ni元素主要以類質同象的形式取代Mg元素存在于蛇紋石中.在此基礎上分別進行了紅土鎳礦焙燒、氫氣還原、磁選分離鎳和鐵的一系列實驗研究.紅土鎳礦與碳酸鹽添加劑進行混合焙燒實現了Ni和Fe氧化物的釋放;對焙燒產物進行氫氣還原,還原產物中Ni和Fe元素以金屬形態存在,Fe金屬化率最高超過80%,遠大于原礦還原產物中Fe的金屬化率(4%-8%),且隨著溫度升高,Ni元素易與Fe結合生成Fe-Ni;磁選所得產物中Ni和TFe品位分別達到3%和20%,Fe和Ni的回收率分別達到80%和90%,初步實現Ni和Fe的富集.Abstract: Basic characteristics of Indonesia laterite nickel ore were systematically studied in this paper. It is found that the nickel laterite mainly consists of lizardite and enstatine. Most of Mg located in lizardite is replaced by Ni in isomorphism. A series of experiments were performed to investigate Ni and Fe enrichment from the nickel laterite by calcination, hydrogen reduction and magnetic separation. The results show that the release of Ni and Fe oxides is achieved by calcination of nickel laterite and carbonate addictive. When the calcinate is reduced by hydrogen, Ni and Fe elements are found in metallic form in reduction products, and the metallization rate of Fe is more than 80~, which is much higher than that of the raw nickel laterite ore (from 4% to 8%). As the temperature rises, Ni is easy to bond with Fe in the form of Fe-Ni. The mass fractions of Ni and TFe in magnetic separation products reach 3% and 20%, and the yielding rates of Fe and Ni reach 80% and 90%, respectively, meaning that preliminary extraction of Fe and Ni is achieved.
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Key words:
- nickel laterite /
- calcination /
- ore reduction /
- magnetic separation /
- carbonates
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