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一种提高铝土矿残渣中钪和钛浸出效率并抑制硅胶形成的新方法。

Novel Approach for Enhanced Scandium and Titanium Leaching Efficiency from Bauxite Residue with Suppressed Silica Gel Formation.

作者信息

Alkan Gözde, Yagmurlu Bengi, Cakmakoglu Seckin, Hertel Tobias, Kaya Şerif, Gronen Lars, Stopic Srecko, Friedrich Bernd

机构信息

IME- Process Metallurgy and Metal Recycling, RWTH Aachen University, Aachen, Germany.

MEAB Chemie Technik GmbH, Aachen, Germany.

出版信息

Sci Rep. 2018 Apr 4;8(1):5676. doi: 10.1038/s41598-018-24077-9.

DOI:10.1038/s41598-018-24077-9
PMID:29618774
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5884853/
Abstract

The need of light weight alloys for future transportation industry puts Sc and Ti under a sudden demand. While these metals can bring unique and desired properties to alloys, lack of reliable sources brought forth a supply problem which can be solved by valorization of the secondary resources. Bauxite residue (red mud), with considerable Ti and Sc content, is a promising resource for secure supply of these metals. Due to drawbacks of the direct leaching route from bauxite residue, such as silica gel formation and low selectivity towards these valuable metals, a novel leaching process based on oxidative leaching conditions, aiming more efficient and selective leaching but also considering environmental aspects via lower acid consumption, was investigated in this study. Combination of hydrogen peroxide (HO) and sulfuric acid (HSO) was utilized as the leaching solution, where various acid concentrations, solid-to-liquid ratios, leaching temperatures and times were examined in a comparative manner. Leaching with 2.5 M HO: 2.5 M HSO mixture at 90 °C for 30 min was observed to be the best leaching conditions with suppressed silica gel formation and the highest reported leaching efficiency with high S/L ratio for Sc and Ti; 68% and 91%; respectively.

摘要

未来交通运输行业对轻质合金的需求使得钪（Sc）和钛（Ti）的需求激增。虽然这些金属能为合金带来独特且理想的性能，但可靠来源的匮乏引发了供应问题，而二次资源的增值利用可以解决这一问题。铝土矿残渣（赤泥）含有可观的钛和钪含量，是这些金属安全供应的一种有前景的资源。由于从铝土矿残渣直接浸出存在缺点，比如形成硅胶以及对这些有价值金属的选择性低，本研究考察了一种基于氧化浸出条件的新型浸出工艺，旨在实现更高效、更具选择性的浸出，同时通过降低酸消耗来考虑环境因素。采用过氧化氢（H₂O₂）和硫酸（H₂SO₄）的组合作为浸出溶液，以对比的方式考察了各种酸浓度、固液比、浸出温度和时间。在90℃下用2.5M H₂O₂: 2.5M H₂SO₄混合物浸出30分钟被观察到是最佳浸出条件，可抑制硅胶形成，并且在高固液比下钪和钛的浸出效率达到报道的最高值；分别为68%和91%。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0aba/5884853/d091763f6004/41598_2018_24077_Fig12_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0aba/5884853/98df3d42f6d1/41598_2018_24077_Fig1_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0aba/5884853/1842cf8f1e29/41598_2018_24077_Fig4_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0aba/5884853/e4da8ab78a57/41598_2018_24077_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0aba/5884853/617c44a08b4e/41598_2018_24077_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0aba/5884853/e2810e7a8013/41598_2018_24077_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0aba/5884853/649f379d2d9c/41598_2018_24077_Fig10_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0aba/5884853/7273f41eb3af/41598_2018_24077_Fig11_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0aba/5884853/d091763f6004/41598_2018_24077_Fig12_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0aba/5884853/98df3d42f6d1/41598_2018_24077_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0aba/5884853/5859ebf56262/41598_2018_24077_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0aba/5884853/5af8b789fc2b/41598_2018_24077_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0aba/5884853/1842cf8f1e29/41598_2018_24077_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0aba/5884853/692295844654/41598_2018_24077_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0aba/5884853/15eba6ada793/41598_2018_24077_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0aba/5884853/e4da8ab78a57/41598_2018_24077_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0aba/5884853/617c44a08b4e/41598_2018_24077_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0aba/5884853/e2810e7a8013/41598_2018_24077_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0aba/5884853/649f379d2d9c/41598_2018_24077_Fig10_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0aba/5884853/7273f41eb3af/41598_2018_24077_Fig11_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0aba/5884853/d091763f6004/41598_2018_24077_Fig12_HTML.jpg

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