Caustic potash assisted roasting of the Nigerian ferro-columbite concentrate and guanidine carbonate-induced precipitation: A novel technique for extraction of Nb–Ta mixed-oxides
Caustic potash assisted roasting of the Nigerian ferro-columbite concentrate and guanidine carbonate-induced precipitation: A novel technique for extraction of Nb–Ta mixed-oxides
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苛性钾辅助焙烧尼日利亚铌铁矿精矿和碳酸胍诱导沉淀：提取 Nb-Ta 混合氧化物的新技术
DOI：
10.1016/j.rineng.2022.100415
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发表时间：
2022
影响因子：
5
通讯作者：
Onwualu, Azikiwe Peter
中科院分区：
文献类型：
--
作者：
Habinshuti, Jean Baptiste;Munganyinka, Jeanne Pauline;Adetunji, Adelana R.;Mishra, Brajendra;Tanvar, Himanshu;Mukiza, Janvier;Ofori-Sarpong, Grace;Onwualu, Azikiwe Peter
本文研究了碱辅助焙烧、溶解和回收尼日利亚乔斯高原铌铌铁精矿中铌钽混合氧化物的工艺。采用碱助焙烧和碳酸胍盐水基浸出的方法实现了铌钽的可持续提取。以氢氧化钾（KOH）为助熔剂，在优化条件（250 °C，100%质量比，1 h）下焙烧精矿，然后用水浸出。这导致-250和+250 μm粒度级分别有97-96%的Nb、80-96%的Ta、92-91%的W和64-65%的Mn溶解，而在残留物中留下大部分Sn（94-83%）和Fe（79-81%）。采用碳酸胍盐作沉淀剂的新方法，选择性地回收了溶解的铌和钽。提取率高达100%左右。在50 mg/mL胍的最佳条件下，+250 μm精矿中铌和钽的最终回收率分别约为96%和85%。然后将获得的（Nb，Ta）-胍沉淀物在900 °C下煅烧1小时并转化为混合的（Nb，Ta）2 O 5（97%）并除去胍。基于物料平衡，发现从一吨铌铁矿进料精矿中可以获得约734.5kg纯度高于84%的（Nb，Ta）-胍沉淀。碱助焙烧-溶解-回收铌钽混合氧化物工艺是一种环境友好的新工艺，是替代传统氢氟酸法提取铌钽的有效技术。
The current study focuses on alkali-assisted roasting, dissolution, and recovery of mixed oxides of niobium (Nb) and tantalum (Ta) from a ferro-columbite concentrate collected from Jos Plateau in Nigeria. Alkali-assisted roasting and water-based leaching to extract Nb and Ta using guanidine carbonate salt were adopted for sustainable extraction. The concentrate was roasted with caustic potash (KOH) as flux at optimized conditions (250 °C, 100% mass flux-to-concentrate ratio, 1 h) and leached with water. This resulted in dissolution of 97-96% Nb, 80-96% Ta, 92-91% W and 64-65% Mn for −250 and + 250 μm size fractions respectively while leaving behind in the residue most of Sn (94-83%) and Fe (79-81%). The amount of Nb and Ta dissolved were selectively recovered with novel application of guanidine carbonate salt as precipitating agent. High extraction yield (∼100%) was achieved. The final recovery of approximately 96% Nb and 85% Ta contained in the +250 μm concentrate feed sample was obtained under optimum conditions of 50 mg/mL guanidine. The (Nb,Ta)-guanidine precipitate obtained was then calcined at 900 °C for 1 h and converted into mixed (Nb,Ta)2O5(97%) and removed the guanidine. Based on material balance, it was found that approximately 734.5 kg of (Nb,Ta)-guanidine precipitate with purity higher than 84% could be obtained from one tonne of ferro-columbite feed concentrate. The current technique of alkali-assisted roasting, dissolution, and recovery of mixed oxides of Nb and Ta is a novel process and presents an environmentally benign, and it is an efficient technique to replace the traditional method which uses an environmentally harmful hydrofluoric acid to extract Nb and Ta.
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影响因子：
9.9
作者：
Arnould, C.;Koranyi, T. I.;Mekhalif, Z.
通讯作者：
Mekhalif, Z.
影响因子：
64.8
作者：
J. Clegg
通讯作者：
J. Clegg
湿法冶金工艺绿色提取埃塞俄比亚肯蒂查矿石铌和钽：综述
影响因子：
4.7
作者：
B. Gebreyohannes;V. Alberto;Bogale Tadesse;A. Yimam;G. Woldetinsae
通讯作者：
G. Woldetinsae
科技金属的回收
DOI：
10.1016/b978-0-444-64200-4.00016-5
发表时间：
2019
期刊：
Sustainable Resource Recovery and Zero Waste Approaches
影响因子：
--
作者：
S. Luidold
通讯作者：
S. Luidold
影响因子：
12.1
作者：
Filella, Montserrat
通讯作者：
Filella, Montserrat