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000840621 1001_ $$0P:(DE-HGF)0$$aSchneider, A.$$b0$$eCorresponding author
000840621 245__ $$aLithium extraction from the mineral zinnwaldite: Part I: Effect of thermal treatment on properties and structure of zinnwaldite
000840621 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2017
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000840621 520__ $$aLithium has become an energy critical element and thus the security of supply is of great importance. As a local German resource, attention was directed towards the mica-type mineral zinnwaldite. It represents a lithium-rich siderophyllite and corresponds to an intermediate polylithionite–siderophyllite solid solution with high contents of fluoride. Mineral samples from the deposit Zinnwald/Cínovec at the German/Czech border were analyzed and characterized by a variety of methods, particularly concerning its thermal behavior. Understanding the thermal behavior of the mica gives the opportunity to develop new and cost-efficient methods for lithium extraction.Investigations with different spectroscopic methods revealed the decomposition mechanisms. Starting at 300 °C, oxidation of Fe2+ catalyzed the dehydroxylation of the mica by dehydrogenation. This is followed by a dehydroxylation similar to the mechanism of dioctahedral micas. At higher temperatures, the release of HF was detected. At about 800 °C the precipitation of hematite was observed. The complete decomposition of Zinnwaldite takes place at 900 °C, it is accompanied by the liberation of SiF4 and leads to the formation of several solid decomposition products. By means of single-crystal diffraction using X-rays and neutrons the structural changes could be identified after annealing at 700 °C. The results point to a transformation into a polylithionite-like structure, the end member of the solid solution series.
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000840621 7001_ $$0P:(DE-Juel1)156232$$aSchmidt, H.$$b1
000840621 7001_ $$0P:(DE-Juel1)164297$$aMeven, M.$$b2$$ufzj
000840621 7001_ $$0P:(DE-HGF)0$$aBrendler, E.$$b3
000840621 7001_ $$0P:(DE-HGF)0$$aKirchner, J.$$b4
000840621 7001_ $$0P:(DE-HGF)0$$aMartin, G.$$b5
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000840621 773__ $$0PERI:(DE-600)2015542-6$$a10.1016/j.mineng.2017.05.006$$gVol. 111, p. 55 - 67$$p55 - 67$$tMinerals engineering$$v111$$x0892-6875$$y2017
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