Characterization of products emanating from conventional and microwave energy roasting of chalcopyrite (CuFeS₂) concentrate

详细信息

下载全文

推荐本文 |

• 作者：Antoine F. Mulaba-Bafubiandi
• 关键词：microwave and conventional roasting ; chalcopyrite concentrate ; ferrites formation
• 刊名：Hyperfine Interactions
• 出版时间：February, 2006
• 出版年：2006
• 期刊代码：18_03043843
• 类别：cp
• 卷：168
• 期：1-3
• 页码：923-928
• 数据来源：sp

摘要

Chalcopyrite concentrate (83%CuFeS₂, 3%FeS₂ and 14%ZnS) which is a typical feed to the matte smelting process for copper extraction via pyro metallurgical route has been roasted with microwaves. Comparison of mineralogical phases obtained was made with the case of conventional roasting. Resulting calcines were characterised with M枚ssbauer spectroscopy and XRD. It was observed that complete oxidation (dead roasting) of the chalcopyrite was achieved after 10 min with microwaves while 20 min were required in the conventional route. The mineralogical phases found in the dead-roasted calcines produced from microwave roasting of this chalcopyrite concentrate were the hematite (Fe₂O₃), franklinite (ZnFe₂O₄), copper-rich ferrite (Cu_1−x Zn _x Fe₂O₄, x ≤ 0.5), and copper ferrite (CuFe₂O₄). The findings of this work indicated that it was technologically feasible to oxidize the chalcopyrite with microwaves using a 2.45 GHz multimode applicator.