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Characterization and Utilization of Natural Zeolites in Technical Applications

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Characterization and Utilization of Natural Zeolites in Technical Applications Originalarbeit BHM (2017) Vol. 162 (4): 142–147 DOI 10.1007/s00501-017-0596-5 © The Author(s) 2017. This article is an open access publication. Characterization and Utilization of Natural Zeolites in Technical Applications Kristina Stocker1, Markus Ellersdorfer2, Markus Lehner2, and Johann G. Raith1 1Chair of Resource Mineralogy, Montanuniversität Leoben, Leoben, Austria 2Chair of Process Technology and Industrial Environmental Protection, Montanuniversität Leoben, Leoben, Austria Received March 24, 2017; accepted March 27, 2017; published online April 10, 2017 Abstract: Zeolites and zeolite rocks are commonly used in cal/chemical analysis prior to their application in technical different industrial applications. Natural zeolites present an processes. This is important for quality assurance and for attractive material for environmental applications because identifying the best suited zeolites for specific technical pro- of their high abundance, availability and low costs. De- cesses, especially when the proposed applications are not pending on geological settings and conditions during min- standardized. eral formation, natural zeolite deposits usually represent a heterogeneous mixture of zeolite minerals together with Keywords: Natural zeolites, Clinoptilolite, Ammonium, Ion varying amounts of gangue minerals (e. g. quartz, feldspars exchange, Characterization routine and phyllosilicates). Hence, profound mineralogical knowl- edge and a detailed characterization of natural zeolites are Charakterisierung und Einsatz natürlicher Zeolithe in essential for tapping their full potential in any practical ap- technischen Prozessen plication. However, this is rarely done as detailed miner- alogical characterizations are elaborate and often neglected Zusammenfassung: Zeolithe und zeolithhältige Gesteine in favour of bulk chemical analyses (e. g. XRF). werden in verschiedensten industriellen Anwendungen In this paper we describe typical technical applications for eingesetzt. Natürliche Zeolithe sind besonders attraktive natural zeolites as well as the requirements demanded for Materialien für den Umwelttechnikbereich, da sie leicht their use. An analytical protocol has been developed for the verfügbar und kostengünstig sind. Abhängig von geolo- detailed characterization of natural zeolites for ammonium gischer Stellung und den Bedingungen während der Mi- exchange consisting of a combination of mineralogical and neralbildung bestehen Zeolithlagerstätten meist aus einer chemical methods and is exemplarily demonstrated. The heterogenen Anreicherung von Zeolithmineralen gemein- methodology comprises mineralogical investigations with sam mit unterschiedlichen Gehalten an Nebengemengtei- X-ray diffraction (XRD) and electron microprobe analyses len wie zum Beispiel Quarz, Feldspat und verschiedenen (EPMA) to provide qualitative data on mineral composi- Phyllosilikaten. Um das vollständige Potential dieser Mi- tions and in-situ analysis of mineral chemistry (Si/Al-ratio, nerale während des Einsatzes in technischen Prozessen cation contents). The examinations are accompanied by auszuschöpfen, ist es neben der chemischen Analyse der bulk chemical analysis (XRF) as well as thermoanalytical Gesteine notwendig, die mineralogischen und mineral- investigations (TG/DSC) to distinguish between certain ze- chemischen Eigenschaften verschiedener Zeolithminerale olite minerals. Finally, ion exchange experiments for am- und deren Verhalten genau zu kennen. Dies wird oftmals monium have been carried out to determine the cation ex- zu Gunsten von chemischen Gesamtgesteinsanalysen, die change capacity (CEC) of zeolite samples for a defined range alleinstehend jedoch wenig Aussagen über die Minerale of concentrations. selbst zulassen, vernachlässigt. The aim of the study is to develop an analytical routine Der vorliegende Beitrag befasst sich mit der Entwicklung in order to enable the detailed characterization of natural einer Analysenroutine für natürliche Zeolithe zur Ammoni- zeolite samples with standardized means of mineralogi- umabtrennung, indem verschiedene mineralogische und physikalisch/chemische Analysemethoden miteinander kombiniert und an einer Probe eines natürlichen Zeoliths Dipl.-Ing. K. Stocker () Chair of Resource Mineralogy, exemplarisch dargestellt werden. Die qualitative Mine- Montanuniversität Leoben, ralidentifikation erfolgte mittels Röntgendiffraktometrie Peter-Tunner-Strasse 5, (RDA) gefolgt von einer in-situ-Analytik der Zeolithmine- 8700 Leoben, Austria rale (qualitative und quantitative Mineralchemie, Si/Al- [email protected] 142 Stocker et al. © The Author(s) BHM (2017), 162. Jg., Heft 4 Originalarbeit Verhältnis, Kationenbestand) an einer Elektronenstrahl- in cement and concrete to neutralize excess lime, but can Mikrosonde (EPMA). Die Gesamtgesteinschemie wurde also be thermally expanded to form light weighed insula- mittels Röntgenfluoreszenzanalyse (RFA) bestimmt. Durch tion materials [12]. Large-scale cation-exchange processes TG/DSC-Analysen wurde die thermische Stabilität der for water treatment using natural zeolites were described in Zeolithe untersucht. Anhand ihres thermischen Verhal- the early 1970s, e. g. [13]. Natural zeolites have advantages tens können mittels DSC-Analyse auch strukturell ähnliche over other cation exchange materials such as commonly Zeolithe unterschieden werden. Abschließend wurde die used organic resins, because they are cheap, exhibit excel- Kationenaustauschkapazität (KAK) für Ammonium durch lent selectivity for different cations at low temperatures, are Bestimmung der Austauschisotherme für einen definierten compact in size and allow simple and cost-efficient mainte- Konzentrationsbereich gemessen. nance in full-scale applications [14]. Ziel ist es, die Charakterisierung natürlicher Zeolithe Although synthetic zeolites generally have higher durch die dargestellte Analysenroutine zu vereinheitli- cation-exchange capacities, natural zeolites exhibit a greater chen und vergleichbar zu machen. Dies ist hinsichtlich der selectivity for ammonium [15], what makes them an inter- Qualitätssicherung und zur Identifikation des für einen esting adsorption reagent for nitrogen removal and recov- bestimmten technischen Einsatz am besten geeigneten ery [16]. Furthermore, natural zeolites were extensively Zeoliths wichtig, besonders wenn es sich dabei um neue, studied for the removal of heavy metals from municipal, noch nicht etablierte Anwendungen handelt. agricultural and industrial waste waters including soil ef- fluents and acid mine drainage [17, 18]. Especially, natural Schlagworte: Natürliche Zeolithe, Klinoptilolith, clinoptilolite is a selective ion exchanger for ammonium Ammonium, Ionenaustausch, Charakterisierung and this has prompted its use in soil amendment and re- mediation, swimming pools and fish farming [19]. Further potential uses for clinoptilolite are in energy storage [20] 1. Introduction and nitrogen recovery [21, 22]. Natural zeolites commonly form as low-temperature al- Zeolites are hydrated alumosilicates with exchangeable teration products in a variety of rocks, but the most im- cations and open channel systems in their lattice. They portant deposits are found in volcanoclastic and sedimen- consist of infinitely extending three dimensional networks tary rocks [23]. Depending on the geological setting and 4- 3- of SiO4 and AlO4 tetrahedra linked by shared oxygen physico-chemical conditions during mineral formation, ze- atoms [1–4]. The frameworks form voids or cages and olite deposits usually represent a heterogeneous mixture of channels in which exchangeable cations can enter. Due to zeolite minerals together with gangue minerals like quartz, substitution of tetravalent silicon by trivalent aluminium feldspars and phyllosilicates (mica, clay minerals). Hence, charge deficiency has to be balanced by incorporation of geological factors control the stability of zeolite phases (i. e. loosely bound monovalent and divalent cations of alkali which zeolites form) as well as the type and amount of and alkaline earth elements [5]. Additionally, water can gangue minerals present and have a strong influence on reversibly enter these structures forming partial hydration the quality and applicability in technical processes. Prior spheres around the cations where the negative dipole of to any technical application a detailed characterization of the water molecules point towards the positively charged these materials is therefore necessary in order to under- monovalent and divalent cations [5]. The more silica is stand performance and behaviour within any practical ap- substituted by aluminium, it is expressed by the Si/Al ratio, plication [14, 24]. The enormous diversity of zeolites and the higher the ability to incorporate cations which enhance varying experimental setups and characterization methods the properties of zeolite minerals as ion exchangers. Be- make it difficult to compare the results especially when pro- side 232 synthetic zeolites (molecular sieves) 67 different posed applications are not standardized. mineral species of natural zeolites subdivided into 28 dif- Therefore, a characterization scheme is proposed for ferent framework types [6] are currently known. Among technical applications by combined mineralogical and them, clinoptilolite is one of the most abundant zeolites chemical methods and results are presented exemplarily and widely used in various applications [7, 8]. Clinoptilolite for one selected zeolite sample (Z-01) from an Austrian belongs to the HEU structure
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