Investigation of Aluminum Dross as a Potential Asphalt Filler

There is a great concern about utilizing different waste materials all over the world. Stockpiling in landfills is not a final solution, therefore researchers try to find alternative methods to utilize these materials [1-5]. One potential area may be road construction. Fillers are one of the most important components of asphalt pavements. It has a dual role. First of all, these fine grained mineral materials (d<0.063 mm) enhance the cohesion with bitumen. Second is to fill the gaps between the particles to produce more compact mixture [6]. The aim of this research is to reveal the possibility of utilization of aluminum dross as a potential asphalt filler. This material, which is a by-product of aluminum casting process, is produced in large quantities year by year and its storage in landfills is not a proper solution. Therefore, there is an increasing demand to utilize this material. During the research material structural tests were made, which can characterize the samples (limestone powder, dross), and the cohesion between bitumen and filler can also reveal. Particle size distribution, BET specific surface area and porosity were investigated. Scanning electron micrographs were taken and oil adsorption test were also made

Aktualitások az útépítésben hasznosítható másodlagos nyersanyagok területén

Az útépítési technológiában a legelterjedtebben használt anyag az aszfaltbeton, amelynek előállításához nélkülözhetetlen alapanyagok a primer kőzetek. A folyamatos építőipari célú felhasználásnak köszönhetően a természetes ásványi anyagok mennyisége világszerte kimerülőben van. Magyarország természetföldrajzi adottságaiból fakadóan jó minőségű ásványvagyonnal rendelkezik, azonban néhány évtized múlva az ásvány-kincsek kitermelése gondot okozhat, esetleg a készletek kimerüléséhez vezethet. Mindezen okok miatt megnőtt az igény olyan potenciális anyagok keresésére, amelyek segítségével az ásványi nyersanyagok részben vagy teljes egészében helyettesíthetők. Ilyen anyagok lehetnek a különböző ipari folyamatok során keletkező másodlagos nyersanyagok. Jelen cikk célja az aktuális trendek,kutatási eredmények összefoglaló bemutatása

Aktualitások az útépítésben hasznosítható másodlagos nyersanyagok területén

Az útépítési technológiában a legelterjedtebben használt anyag az aszfaltbeton, amelynek előállításához nélkülözhetetlen alapanyagok a primer kőzetek. A folyamatos építőipari célú felhasználásnak köszönhetően a természetes ásványi anyagok mennyisége világszerte kimerülőben van. Magyarország természetföldrajzi adottságaiból fakadóan jó minőségű ásványvagyonnal rendelkezik, azonban néhány évtized múlva az ásvány-kincsek kitermelése gondot okozhat, esetleg a készletek kimerüléséhez vezethet. Mindezen okok miatt megnőtt az igény olyan potenciális anyagok keresésére, amelyek segítségével az ásványi nyersanyagok részben vagy teljes egészében helyettesíthetők. Ilyen anyagok lehetnek a különböző ipari folyamatok során keletkező másodlagos nyersanyagok. Jelen cikk célja az aktuális trendek,kutatási eredmények összefoglaló bemutatása

Development and Investigation of Photoactive WO3 Nanowire-Based Hybrid Membranes

Novel hybrid structures have attracted attention in several instances of scientific research and different technological applications in this decade due to their novel characteristics and wide range of applicability. Hybrid membranes with multiple components (three or more) are also increasingly used in water purification applications, and their ease of handling and reusability make them a promising candidate for the degradation of organic pollutants by photocatalysis. In this study, the preparation and characterization of tungsten trioxide nanowire (WO3 NW)-based hybrid membrane structures are reported. Furthermore, the adsorption properties and photocatalytic efficiency of the as-prepared membranes against methylene blue (MB) organic dye under UV irradiation is also presented. Characterization techniques, such as scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray powder diffraction (XRD) are performed to study the morphology and surface of the as-prepared hybrid membranes. The removal efficiency of the hybrid membranes against MB is 77% in a 120 min decomposition reaction. The enhanced value can be attributed to the hybrid structure of the membrane that enhances not only the adsorption capability, but also the photocatalytic performance. Based on the results obtained, it is hoped that hybrid membrane technology could be a promising candidate for future photocatalysis-based water treatment applications

Effect of mechanical treatment on properties of Si-Al-O zeolites

In the work the results influence of mechanical treatment on morphology, specific surface area, and phase composition of natural zeolite of tokaj mountain deposits, synthetic zeolites sAPo-34, sct-323 are presented. specific surface area of the synthetic zeolites decreases during the mechanical activation in a planetary ball mill. the changes of the specific surface area of the natural zeolites corresponds to the curve of the developed specific surface as function of the milling time (rittinger-zone, aggregation-zone and agglomeration-zone). During the mechanical activation, it was observed an increase of system amorphisation by 8-10% for synthetic zeolites, by 40-45% for natural zeolite. results obtained represent scientific and practical interest, which can be used for further studies zeolites

Reaction synthesis of porous nano-structured mullite ceramic composites from alumina and zeolite-poor rock with enhanced strength and low thermal conductivity

Porous mullite-based ceramics have been developed using a mixture of zeolite-poor rock and alumina through mechanical activation and reactive sintering. The experimental findings demonstrate that the in-situ mullite growth may develop in a variety of shapes, including whiskers, nanofiber, nanonetwork and diamond-like particles. The XRD examination indicates that the samples sintered at 1500 °C are mostly made of the mullite phase. The SEM photographs show that as the sintering temperature increases, the mullitization process takes place first in zeolite-poor rock particles, and subsequently, alumina combines with the silica-containing phase via a liquid-phase sintering mechanism to produce an interlocking network of extended secondary mullite. The effects of mullite formation and the sintering temperature on various properties of the sintered samples, such as their density, apparent porosity, thermal conductivity, strength, wear resistance, composition, morphologies, and microstructural characteristics of the sintered samples were studied. Increasing the sintering temperature from 1100 to 1500 °C improved the different properties. The density increased from 1.9 to 2.1 g/cm3, thermal conductivity rose from 0.9 to 1.6 W/m.K, compressive strength escalated from 18.9 to 92.1 MPa, and worn material volume decreased from 2444 to 36.9 mm3 after a 5-min abrasion test