Pore structure of lightweight clay aggregate incorporate with non-metallic products coming from aluminium scrap recycling industry

Bajāre, Diāna; Korjakins, Aleksandrs; Kazjonovs, Jānis; Rozenštrauha, Ineta

doi:10.1016/j.jeurceramsoc.2011.07.039

Cited by 59 publications

(31 citation statements)

References 9 publications

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“…The chemical composition of the raw material determines the bloating (expansion) behaviour and the properties of the product [6]. Riley [7] investigated different compositions of clay and defined regimes in the ternary system SiO 2 -Al 2 O 3 -flux (Riley diagram) where bloating takes place when heated to temperatures up to 1300°C and given that a gas forming reaction occurs at the same temperature.…”

Section: Introductionmentioning

confidence: 99%

The effect of additives on the properties of lightweight aggregates produced from clay

Bernhardt

Justnes

Tellesbø³

et al. 2014

Cement and Concrete Composites

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In an attempt to improve the properties, lightweight aggregates were produced from clay with the addition of Na 2 CO 3 , SiO 2 , Fe 2 O 3 , and Fe in quantities between 2 and 10 wt% and examined with respect to strength, density and expansion behaviour. The additives were mixed into dry clay powder, water was added and pellets were formed by hand and fired at 1120°C in a chamber furnace. Particle densities of the products ranged from 0.31-0.57 g/cm 3 , porosities from 78-89% and the solid strength from 0,54-1,58 MPa. The addition of Na 2 CO 3 proved to decrease the viscosity of the glass phase at the surface of the pellets but resulted in a 2 reduced expansion, irregular shape and pellets sticking together. SiO 2 addition did not give any major change in properties. The addition of Fe 2 O 3 increased the pore size in the centre of the pellets, however with insignificant change in strength and density. Adding 5 wt% metallic iron powder led to LWA pellets with increased porosity, reduced density, larger pores and low mechanical strength and could be an useful additive in applications where low density is more important than strength.

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Section: Introductionmentioning

confidence: 99%

The effect of additives on the properties of lightweight aggregates produced from clay

Bernhardt

Justnes

Tellesbø³

et al. 2014

Cement and Concrete Composites

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“…Ground ASRW with fraction <1 mm was FIGURE 1 | X-ray analysis of solid raw materials, (A) CH, (B) K26, (C) ASRW; Q / q, quartz (85-0798 / 83-2187); Cr, cristobalite (03-0267); M, mullite (01-0613); C, corundum (71-1124); s, spinel (75-1799); f, iron oxide (32-0469); , calcium aluminum iron oxide (21-0830); , magnesium aluminum silicate (30-0788); •, aluminum iron oxide (18-0633); g, gibbsite (70-2038). used as the pore forming agent due to gas emissions, when it reacts with an activation solution (Bajare et al, 2012). 6 M NaOH solution, which was prepared by using sodium hydroxide flakes with 99% purity (Tianye Chemicals Ltd., China), was used as alkali activating solution.…”

Section: Raw Materialsmentioning

confidence: 99%

Waste Stream Porous Alkali Activated Materials for High Temperature Application

et al. 2019

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The growing interest of using industrial waste as recycled raw materials for the production of new, innovative materials is associated with effective use of natural resources and circular (zero-waste) economy. The research object is waste stream materials coming from chemical and processing industries, such as aluminum scrap recycling waste, chamotte-like precursor, firebricks sawing residues, and their use in production of high-temperature resistant, porous insulation materials by using alkali activation technique with 6 M NaOH solution. Adding aluminum scrap recycling waste to the composition of the tested alkali activated materials (AAM) contributed to the porous structure of the material with the pore size ranging from 1,000 to 5,000 µm (detected by Micro-XCT, SEM). Lightweight (350-850 kg/m 3 ) and heat-resistant (up to 1,000 • C) AAM with compressive strength from 1.0 to 3.0 MPa was obtained. The mineralogical composition of the obtained AAM was detected (XRD) and the heat resistant minerals in the structure of AAM were identified. It was concluded that the increased amount of Al 2 O 3 in the raw material composition resulted in improved thermal stability of the AAM. In case where SiO 2 /Al 2 O 3 ratio is <2, the formation of high-temperature resistant minerals, such as carnegeite and nepheline, was observed. The obtained AAM could resist up to 8 thermal shock cycles and it could be easily adapted to the industrial production and application such as thermal insulation layer in laboratory furnaces.Keywords: alkali activated material, porous materials, heat resistance, application in high temperature, aluminum scrap recycling waste HIGHLIGHTS -For the first time alkali activated materials were created on the chamotte-like and firebricks sawing residue precursors. -Highly porous (up to 80 vol.%) structure of alkali activated materials were obtained by aluminum scrap recycling waste. -For the first time the porous alkali activated materials was evaluated for high temperature application. -The porous alkali activated materials manufacture is simple, sustainable, and based on mostly waste stream materials. -Firebrick waste increased the temperature cycling performance of the material and proved to be highly suitable for industrial application.Bajare et al.

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“…Therefore, beneficial reuse or recycling of dross, instead of using expensive treatment methods to discard it, can offer both economic and environmental gains. Currently, dross management has involved metal recovery, either mechanically or chemically [18] as well as other repurposing for refractory materials, composites, and slag, among others [19,20]. These latter methods have shown promise and lead to lower waste by volume due to salt management [21], but in some cases, metal recovery may be most beneficial either economically or environmentally [22].…”

Section: Reuse and Reprocessing Of Drossmentioning

confidence: 99%

Data Mining Toward Increased Use of Aluminum Dross

Chang

Olivetti

Fjeldbo³

et al. 2015

J. Sustain. Metall.

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Recycling provides a key strategy to move toward a more sustainable society by partially mitigating the impact of fast-growing material consumption. One main barrier to increased recycling arises from the fact that in many real world contexts, the quality of secondary (or scrap) material is unknown and highly variable. Even if scrap material is of known quality, there may be finite space or limited operational flexibility to separate or sort these materials prior to use. These issues around identification and grouping given the operational constraints create limitations to simply developing an appropriate sorting strategy, let alone implementing one. This study suggests the use of data mining as a strategy to manage raw materials with uncertain quality using existing data from the recycling industry. A clustering analysis is used to recognize the pattern of raw materials across a broad compositional range in order to provide criteria for grouping (binning) raw materials. This strategy is applied to an industrial case of aluminum recycling to explore the benefits and limitations in terms of secondary material usage. In particular, the case investigated is around recycling industrial byproducts (termed dross for the case of the aluminum industry). The binning strategy obtained by the clustering analysis can significantly reduce material cost by increasing the compositional homogeneity and distinctiveness of uncertain raw materials. This result suggests the potential opportunity to increase low-quality secondary raw material usage before investment in expensive sorting technology.

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Pore structure of lightweight clay aggregate incorporate with non-metallic products coming from aluminium scrap recycling industry

Cited by 59 publications

References 9 publications

The effect of additives on the properties of lightweight aggregates produced from clay

The effect of additives on the properties of lightweight aggregates produced from clay

Waste Stream Porous Alkali Activated Materials for High Temperature Application

Data Mining Toward Increased Use of Aluminum Dross

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