1. Utilization potential of steel slag for CO2 sequestration and as a filler aggregate in mortarsMojca Loncnar, Sara Tominc, Lea Žibret, Sabina Dolenec, Maruša Mrak, Vilma Ducman, 2026, izvirni znanstveni članek Povzetek: Steel slag is an abundant by-product of steelmaking and a promising candidate for CO2 sequestration due to its favorable chemical composition and mineralogy. In this study, the CO2 sequestration capacity of the processed steel slag Ekominit was analyzed. Ekominit is a mineral product obtained by processing a mixture of electric arc furnace (EAF) stainless steel slag and ladle slag, currently used only for simple engineering constructions. The study demonstrated a promising sequestration capacity of 127.4 g CO2 per kg of Ekominit, measured using direct semi-dry carbonation under ambient pressure at 40 ± 0.5 °C, 80 ± 3.2% relative humidity, and 20 ± 0.1 vol% CO2 for 5 days, which is within the typical range reported for carbonated steel slags (100–150 gCO2/ kgslag). Although Ekominit did not show sufficient potential as a supplementary cementitious material in mortar, the results confirmed that its incorporation as a filler—with or without carbonation treatment—enhances both the flowability and compressive strength of the mortar. This research emphasizes the dual-function potential of Ekominit: it captures CO2, contributing to the decarbonization of the steel sector, and enables its reuse in construction materials, even improving the performance of mortars when using such carbonated Ekominit as fillers. Through such industrial symbiosis, environmental impact is further reduced by substituting virgin raw materials with secondary products.
Ključne besede: slag, carbonation, sequestration, aggregates
Objavljeno v DiRROS: 06.03.2026; Ogledov: 255; Prenosov: 146
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2. Dataset for the article Geochemical properties of dolomite on the junction between Dinarides, Eastern and Southern AlpsGorazd Žibret, Neža Malenšek Andolšek, Mitja Kolar, Jernej Imperl, Lea Žibret, 2026, zaključena znanstvena zbirka raziskovalnih podatkov Povzetek: The dataset supports the data in the tables and figures in the research article Geochemical properties of dolomite on the junction between Dinarides, Eastern and Southern Alps (doi:). It contains the original results of the elemental composition of the dolomites (methods: MA250, AQ300, LF300), the original data from the XRD analyses of the dolomites, and the original results of the EDXS point analysis for individual mineral phases incorporated in the dolomites.
Objavljeno v DiRROS: 29.01.2026; Ogledov: 258; Prenosov: 125
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4. Sequestration capacity of bio-based ashes and influence of carbonation on the leaching behavior depending on their mineralogical compositionSara Tominc, Majda Pavlin, Lea Žibret, Vilma Ducman, Ottosen Lisbeth M., 2025, izvirni znanstveni članek Povzetek: Mineral CO2 sequestration is a promising carbon capture and storage approach based on the chemical reaction of CO2 with alkaline materials containing Ca- and Mg-rich (hydr)oxides and silicates. This results in the formation of relatively insoluble and storable carbonates. This study investigates six ashes of different origins and chemical compositions to assess their CO2 sequestration potential and leaching behavior, offering insights into their environmental impact and potential risks. The carbonation experiments were conducted under controlled laboratory conditions and the CO2 sequestration capacity was quantified using a pressure calcimeter, supported by thermogravimetric analysis. Wood ashes and ash from the co-combustion of biomass from a paper mill showed the highest carbonation potential, with CO2 sequestration capacities between 344.8 and 432.3 g CO2 per kg of ash and carbonation efficiencies between 82.4 % and 94.4 %. In addition to the high sequestration capacity of the ashes, carbonation was found to affect the leaching behavior of the ash in the environment by changing its mineralogical composition. The process consistently reduced pH and generally decreased the leaching of certain trace elements, except for Mo, and Cr. Nevertheless, the reduction in the leachability of several elements suggests a partial environmental benefit of carbonation. The findings highlight the dual functionality of the carbonation: it provides a viable route for the permanent binding of CO2 and can enhance the stabilization of industrial residues. However, the persistence of metal leaching indicates that its overall effectiveness in mitigating environmental risks associated with residue disposal or reuse remains material-dependent.
Ključne besede: enforced carbonation, maximum sequestration capacity, leaching, heavy metals, mineralogy, bio-based ash
Objavljeno v DiRROS: 13.01.2026; Ogledov: 307; Prenosov: 273
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5. Dataset for the article Sequestration capacity of bio-based ashes and influence of carbonation on the leaching behavior depending on their mineralogical compositionSara Tominc, Majda Pavlin, Lea Žibret, Vilma Ducman, Ottosen Lisbeth M., 2025, zaključena znanstvena zbirka raziskovalnih podatkov Povzetek: The dataset supports the data presented in the tables and figures of the scientific article Sequestration capacity of bio-based ashes and influence of carbonation on the leaching behavior depending on their mineralogical composition (doi: 10.1016/j.ceramint.2025.11.229). It includes calcimetric measurements, XRF, TGA, and XRD analysis data, as well as calculations of CO2 uptake and CO2 sequestration capacity for the analyzed samples. Additionally, it contains original FTIR measurement data, which are not included in the article and serve as supplementary material.
Ključne besede: enforced carbonation, maximum sequestration capacity, leaching, heavy metals, mineralogy, bio-based ash
Objavljeno v DiRROS: 21.10.2025; Ogledov: 476; Prenosov: 216
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6. Comparing methods for determining the CO2 content in CO2-Sequestering materials and natural rockNika Kavčič, Sara Tominc, Lea Žibret, Gorazd Žibret, Mitja Kolar, Vilma Ducman, 2025, izvirni znanstveni članek Povzetek: Carbon capture plays an important role in the decarbonation of the building sector. One way to capture carbon is through mineral carbonation, in which Ca and Mg compounds react with CO2 to form stable carbonate minerals such as calcite, dolomite, magnesite and/or siderite, permanently sequestering CO2. Various techniques are available to measure the amount of permanently bound CO2 and quantify the carbonation potential. The suitability and accuracy of a particular method are very important, as the accurate determination of CO2 is crucial to correctly assess the sequestration potential of different materials. This study compares the three methods: calcimetric, gravimetric and thermogravimetric analysis used for CO2 determination in different types of ash, slag and natural rock. While the CO2 content in natural rock is stable, the CO2 content in slag and ash can change over time as the contained minerals gradually absorb CO2 (by natural or accelerated carbonation) until they are fully carbonated. To avoid errors in testing the CO2 uptake, as-received samples were first exposed to the full carbonation process and then tested. The comparison of calcimeter, thermogravimetric and gravimetric analysis of ground and sieved samples with a particle size below 125 μm shows that the results usually differ by less than 2 %. Higher deviations could be caused by non-carbonate minerals (especially in slags) that can react with hydrochloric acid during the calcimetric and gravimetric tests and/or decompose in the range where carbonates decompose, contributing to inaccurate CO2 measurements. The measurement uncertainty was calculated for all three quantitative methods to allow a practical comparability.
Ključne besede: CO2 sequestration, ash, slags, natural rocks, TGA, calcimetry, measurement uncertainty
Objavljeno v DiRROS: 15.10.2025; Ogledov: 553; Prenosov: 360
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7. Selective seperation of magnesium from Slovenian dolomitesJernej Imperl, Mitja Kolar, Vilma Ducman, Gorazd Žibret, Lea Žibret, 2025, objavljeni znanstveni prispevek na konferenci Povzetek: Although magnesium is one of the most abundant elements on Earth by weight, the demand for magnesium is constantly increasing due to its widespread use in a diverse range of industries such as metal alloys, electronics, batteries, agricultural and pharmaceutical compounds. For this reason, magnesium is categorised as a critical raw material by the European Union. Dolomite CaMg(CO3)2 is one of the most important mineral sources of magnesium, which in its pure form contains 13.18 % magnesium by weight. Various pyrometallurgical and hydrometallurgical processes have been developed and are used to extract magnesium from dolomite and other magnesium ores. In this study, samples of dolomite of different geological ages were collected in Slovenia and their elemental composition was analysed by microwave-assisted acid digestion and ICP-OES. Magnesium was then extracted by selective leaching and selective precipitation. Leaching was carried out with inorganic and organic acids. The separation of magnesium and calcium in a solution prepared by dissolving dolomite with acid was carried out by precipitation with hydroxide and oxalate. High extraction yields of magnesium and a significant separation between the two metals were achieved with both methods.
Ključne besede: magnesium, dolomite, extraction, selective leaching, selective precipitation
Objavljeno v DiRROS: 16.07.2025; Ogledov: 669; Prenosov: 420
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8. Dataset for the article Comparing methods for determining the CO2 content in CO2-Sequestering materials and natural rockSara Tominc, Nika Kavčič, Lea Žibret, Gorazd Žibret, Mitja Kolar, Vilma Ducman, 2025, zaključena znanstvena zbirka raziskovalnih podatkov Povzetek: The dataset supports the data in the tables and figures of the scientific article Comparing methods for determining the CO2 content in CO2-Sequestering materials and natural rock (doi: https://doi.org/10.1016/j.ceramint.2025.07.109). It contains the calcimetric measurements, the original results of the XRF measurements and the original data of the TGA, gravimetric and XRD analyzes as well as the calculations of the measurement uncertainty for the calcimetric, gravimetric and TG analyzes.
Ključne besede: sekvestracija CO2, pepel, žlindre, naravni kamen, TGA, kalcimetrija, merilna negotovost, CO2 sequestration, ash, slags, natural rocks, TGA, calcimetry, measurement uncertainty
Objavljeno v DiRROS: 24.06.2025; Ogledov: 866; Prenosov: 394
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9. Evaluation of the performance of clay-based bricks with the addition of co-combustion ashLea Žibret, Ivana Carević, Nina Štirmer, Ivan Koloda, Mojca Vrčon, Miha Kragelj, Vilma Ducman, 2025, objavljeni znanstveni prispevek na konferenci Povzetek: The gradual replacement of coal by local renewable resources leads to an increased production of co-combustion ashes (CC). Their disposal can be limited by their use in the construction sector, where they can partially replace primary raw materials. This study evaluates the incorporation of selected Slovenian CC ash into clay-based fired bricks within the EU AshCycle project. The tests included the measurement of water absorption, porosity, density, weight loss, shrinkage, flexural and compressive strength, and freeze-thaw resistance. Two types of clay were used to compare the influence of the selected ash on the performance of the fired samples. Replacing clay mixtures with 10 wt% CC ash reduced the compressive strength of the fired bricks but it still reached the required 10 MPa as specified in EN 772-1 (2015). The addition of CC ash to fired bricks requires careful planning of the raw mixes, taking into account various parameters that may affect the properties of the products.
Ključne besede: fired clay bricks, waste ashes, raw mixture, ceramic-technological tests, freeze-thaw resistance
Objavljeno v DiRROS: 07.04.2025; Ogledov: 1027; Prenosov: 656
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10. Dataset for the conference paper Evaluation of the performance of clay-based bricks with the addition of co-combustion ashLea Žibret, Ivana Carević, Nina Štirmer, Ivan Koloda, Mojca Vrčon, Miha Kragelj, Vilma Ducman, 2025, zaključena znanstvena zbirka raziskovalnih podatkov Povzetek: The dataset supports the data in the tables and figures in the conference article Evaluation of the performance of clay-based bricks with the addition of co-combustion ash (doi: https://doi.org/10.18690/um.fkkt.1.2025.15). It contains the particle size distribution (PSD) measurements, the original data of the XRD analyses, the original results of the XRF measurements, the original results of the water absorption and shrinkage of the samples, fired in gradient kiln as well as the original results of the ceramic-technological tests of bricks after drying and firing at 950 °C.
Ključne besede: fired clay bricks, waste ashes, raw mixture, ceramic-technological tests, freeze-thaw resistance
Objavljeno v DiRROS: 03.12.2024; Ogledov: 1159; Prenosov: 611
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