Recovery and Purification of Tin from Tailings from the Penouta Sn–Ta–Nb Deposit

López, Félix A.; García‐Díaz, Irene; Largo, Olga Rodríguez; Polonio, Francisco García; Llorens, Teresa

doi:10.3390/min8010020

Cited by 40 publications

(38 citation statements)

References 31 publications

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“…Interestingly, the C free amount decreased consistently with the increasing amount of Sn(Oct) 2. This can be explained by the use of C free for the carbothermal reduction of SnO x (formed upon decomposition of Sn(Oct) 2 ) at temperatures above 700 °C . This assumption can be rationalized by taking a closer look at the Raman spectra of the SiOC/Sn nanocomposites (Figure d) showing the well‐known D and G bands at ≈1350 and 1600 cm −1 .…”

Section: Resultsmentioning

confidence: 90%

Silicon Oxycarbide—Tin Nanocomposite as a High‐Power‐Density Anode for Li‐Ion Batteries

et al. 2019

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Tin‐based materials are an emerging class of Li‐ion anodes with considerable potential for use in high‐energy‐density Li‐ion batteries. However, the long‐lasting electrochemical performance of Sn remains a formidable challenge due to the large volume changes occurring upon its lithiation. The prevailing approaches toward stabilization of such electrodes involve embedding Sn in the form of nanoparticles (NPs) in an active/inactive matrix. The matrix helps to buffer the volume changes of Sn, impart better electronic connectivity and prevent particle aggregation upon lithiation/delithiation. Herein, facile synthesis of Sn NPs embedded in a SiOC matrix via the pyrolysis of a preceramic polymer as a single‐source precursor is reported. This polymer contains Sn 2‐ethyl‐hexanoate (Sn(Oct)2) and poly(methylhydrosiloxane) as sources of Sn and Si, respectively. Upon functionalization with apolar divinyl benzene sidechains, the polymer is rendered compatible with Sn(Oct)2. This approach yields a homogeneous dispersion of Sn NPs in a SiOC matrix with sizes on the order of 5–30 nm. Anodes of the SiOC/Sn nanocomposite demonstrate high capacities of 644 and 553 mAh g−1 at current densities of 74.4 and 2232 mA g−1 (C/5 and 6C rates for graphite), respectively, and show superior rate capability with only 14% capacity decay at high currents.

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Section: Resultsmentioning

confidence: 90%

Silicon Oxycarbide—Tin Nanocomposite as a High‐Power‐Density Anode for Li‐Ion Batteries

et al. 2019

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“…Other Ta-rich minerals, such as microlite and wodginite, have also been reported [25,28]. A detail characterization of Penouta ore is described by Lorens et al, López et al, and Alfonso et al [26][27][28].…”

Section: Methodsmentioning

confidence: 96%

Understanding Mineral Liberation during Crushing Using Grade-by-Size Analysis—A Case Study of the Penuota Sn-Ta Mineralization, Spain

2020

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Coarse comminution test-work and modeling are powerful tools in the design and optimization of mineral processing plants and provide information on energy consumption. Additional information on mineral liberation characteristics can be used for assessing the potential of pre-concentration stages or screens in the plant design. In ores of high-value metals (e.g., Ta, W), standard techniques—such as the mineralogical quantification of grain mounts by quantitative evaluation of minerals by scanning electron microscopy (QEMSCAN) or chemical analysis by X-ray fluorescence (XRF) can be challenging, due to the low relative abundance of such valuable minerals. The cost of QEMSCAN is also a limiting factor, especially considering the large number of samples required for the optimization of coarse comminution. In this study, we present an extended analytical protocol to a well-established mechanical test of interparticle breakage to improve the assessment of coarse mineral liberation characteristics. The liberation of ore minerals is a function of the rock texture and the difference in size and mechanical properties of the valuable minerals relative to gangue minerals and they may fraction in certain grain sizes if they behave differently during comminution. By analyzing the bulk-chemistry of the different grain size fractions produced after compressional testing, and by generating element by size diagrams, it is possible to understand the liberation characteristics of an ore. We show, based on a case study performed on a tantalum ore deposit, that element distribution can be used to study the influence of mechanical parameters on mineral liberation. This information can direct further mineralogical investigation and test work.

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“…However, the small grain size of the Ta-Nb minerals at the Penouta mine, and their strong association with cassiterite, make it hard to obtain separate concentrates; new methods that can separate the Sn and Nb-Ta are therefore required. 8 The most used technique for the separation of both metals is solvent extraction employing different agents. 9,10 For example, Ta could be recovered by using a simple primary amide reagent.…”

Section: Introductionmentioning

confidence: 99%

Recovery of niobium and tantalum by solvent extraction from Sn–Ta–Nb mining tailings

et al. 2020

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Recovery and Purification of Tin from Tailings from the Penouta Sn–Ta–Nb Deposit

Cited by 40 publications

References 31 publications

Silicon Oxycarbide—Tin Nanocomposite as a High‐Power‐Density Anode for Li‐Ion Batteries

Silicon Oxycarbide—Tin Nanocomposite as a High‐Power‐Density Anode for Li‐Ion Batteries

Understanding Mineral Liberation during Crushing Using Grade-by-Size Analysis—A Case Study of the Penuota Sn-Ta Mineralization, Spain

Recovery of niobium and tantalum by solvent extraction from Sn–Ta–Nb mining tailings

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