NDLI: Thermal decomposition of zinc hydroxy-sulfate-hydrate minerals

Content Provider	Springer Nature Link
Author	Staminirova, Tsveta Petrova, Nadia Kirov, Georgi
Copyright Year	2016
Abstract	The thermal decomposition of three structurally and chemically close compounds: Zn$_{4}$(OH)$_{6}$(SO$_{4}$)·4H$_{2}$O, NaZn$_{4}$(OH)$_{6}$(SO$_{4}$)Cl·6H$_{2}$O and CaZn$_{8}$(OH)$_{12}$(SO$_{4}$)$_{2}$Cl$_{2}$·9H$_{2}$O, known as namuwite, gordaite and “Ca-gordaite,” was comparatively studied. The thermal events, the released volatiles and solid residues were studied in the range of 20–1000 °C using TG–DTA-MS and powder XRD analyses. The thermal decomposition process of all three compounds includes successive dehydration, dehydroxylation and evolving of SO$_{2}$, O$_{2}$ and Cl. The first stage of dehydration occurs in the low-temperature region by the retention of the layered structure with an undisturbed hydroxide layer and a shrunk interlayer. The release of last interlayer water molecules induces the dehydroxylation of the hydroxide layer. As a result, ZnO and a series of secondary hydroxides and hydroxy-salts: Zn$_{3}$(OH)$_{2}$(SO$_{4}$)$_{2}$ (in the decomposition of the three compounds), β-Zn(OH)Cl (in the case of both gordaites) and Ca(OH)$_{2}$ (for Ca-gordaite) were formed. The existence and formation of Zn$_{3}$(OH)$_{2}$(SO$_{4}$)$_{2}$ for the first time were proved by powder XRD. The decomposition of all secondary hydroxyl-containing compounds during the second stage of the dehydroxylation leads to formation of Zn$_{3}$O(SO$_{4}$)$_{2}$, ZnCl$_{2}$ and CaSO$_{4}$ at middle temperature region. In the high-temperature region, the evolving of SO$_{2}$, O$_{2}$ and HCl occurred due to the decomposition of the (SO$_{4}$)-groups and ZnCl$_{2}$ hydration, respectively. At temperatures up to 1000 °C, ZnO was found to be the main final product of the thermal decomposition of the three minerals. In the case of gordaites, an anhydrite and a Na–Zn–SO$_{4}$ X-ray amorphous phase were also presented.
Starting Page	85
Ending Page	96
Page Count	12
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	125
Issue Number	1
e-ISSN	15882926
Language	English
Publisher	Springer Netherlands
Publisher Date	2016-02-23
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Thermal decomposition Namuwite Gordaite Zn$_{3}$(OH)$_{2}$(SO$_{4}$)$_{2}$ DTA-TG-MS XRD Physical Chemistry Analytical Chemistry Polymer Sciences Inorganic Chemistry Measurement Science and Instrumentation
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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