264 KB25 KB200020242014Đurović, DijanaJanković - Častvan, IvonaKrivokapić, JasminaNikolić, IrenaRadmilović, VelimirRadmilović, Vukštevilka:1letnik:48str. 39-44COBISSID:1031082ISSN:1580-2949URN:URN:NBN:SI:doc-IMJ9DAQJenInštitut za kovinske materiale in tehnologijeMateriali in tehnologijebauxiteboksitcompressive strengthgeopolimerizacijageopolymerizationpolymerization degreestopnja polimerizacijetlačna trdnostGeopolymerization of low-grade bauxite| Geopolimerizacija revnega boksita|In terms of quality, bauxite ore can be classified as high- or low-grade ore. High-grade bauxite ores are used for alumina extraction using the Bayer process, while low-grade bauxite ores have a limited application. In this paper we investigate the possibility of evaluating low-grade bauxite ores with the geopolymerization process. The influence of the synthesis parameters, i.e., alkali and silicate dosages and alkali cations (Na+ and K+) on the compressive strength of bauxite-based geopolymers is evaluated. The results show that an increase in the alkali dosage has a beneficial effect on the strength of bauxite-based geopolymers, while the strengthening of geopolymers by increasing the silicate dosage is limited by the viscosity of the geopolymer paste. Moreover, Na-geopolymers reach higher values of the compressive strength than K-geopolymersGlede na kvaliteto delimo boksitne rude na revne in bogate. Bogate se uporabljajo za pridobivanje glinice po Bayerjevem postopku, medtem ko ima revna boksitna ruda le omejeno uporabnost. V tem članku opisujemo preiskavo možnosti za oceno revne boksitne rude s postopkom geopolimerizacije. Ocenjeni so bili parametri sinteze, to je dodatek alkalij in silikatov ter alkalnih kationov (Na+ in K+) na tlačno trdnost geopolimera na osnovi boksita. Rezultati so pokazali, da povečanje dodatka alkalij ugodno vpliva na trdnost geopolimera na osnovi boksita, medtem ko je utrjevanje geopolimera z dodajanjem silikata omejeno z viskoznostjo geopolimerne paste. Poleg tega doseže Na-geopolimer večjo tlačno trdnost v primerjavi s K-geopolimeromTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije