Residual titanium flakes as a novel material for retention and recovery of rare earth and relatively rare earth elements

Barbulescu, Laura Eugenia; Dumitriu, Cristina; Dragut, Dumitru Valentin; Nicoara, Adrian Ionut; Bădănoiu, Alina; Pîrvu, Cristian

doi:10.1007/s11356-019-06839-8

Cited by 6 publications

(5 citation statements)

References 41 publications

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“…In the past 30 years, numerous studies were performed in order to reduce the carbon footprint of Portland cement and derived concrete, by the partial replacement of clinker with various mineral admixtures [4][5][6][7][8]; today the production portland cements/concretes with supplementar y cementitious materials such as slag, fly ash, limestone filler etc. is a current practice in world-wide cement and concrete industries.…”

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confidence: 99%

Brick and Glass Waste Valorisation in the Manufacture of Aerated Autoclaved Concrete

Stanescu¹,

Bădănoiu²,

Nicoara³

et al. 2019

Rev. Chim.

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Autoclaved aerated concrete (AAC) is a light building material with high porosity, used to improve thermal and sound insulation of the buildings. AAC have a much better thermal efficiency than traditional masonry materials (bricks) or reinforced concrete elements; its use reduces the energy consumption (up to 7%) and consequently the carbon footprint of construction sector. The main constituents of autoclaved aerated concretes are portland cement, siliceous material (aggregate), water and different types of admixtures and additives (lime, foaming agent etc.). The aim of the research presented in this paper is to reduce the environmental impact of the technological process of ACC manufacturing; in this respect, one of the main components of AAC i.e. sand (natural raw material) was substituted with two types of inorganic waste i.e. glass (cullet) and waste brick; the sand substitution rate was comprised between 12.5-100% wt. The results indicate that both glass and brick waste can be incorporated into the autoclaved aerated concrete (AAC) structure without major modifications of apparent density (maximum 10% increase in correlation with substitution amount). For similar values of the apparent density, the AACs prepared with glass waste have higher values of compressive strength and thermal conductivity as compared with AAC with brick waste.

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confidence: 99%

Brick and Glass Waste Valorisation in the Manufacture of Aerated Autoclaved Concrete

Stanescu¹,

Bădănoiu²,

Nicoara³

et al. 2019

Rev. Chim.

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“…Moreover, due to its complex composition [13] titanium waste (W) exhibits mass modification during the thermal treatment ( fig. 7).…”

Section: Resultsmentioning

confidence: 99%

“…-natural sand (S) that fulfills the requirements of European/Romanian standard (SR EN 196-1, 2006); -waste (W) resulted during the mechanical processing of titanium alloy ingots in the surface abrasion/polishing process with abrasive discs. This waste has a high amount of Ti (44%) and Al (13%); the main compounds assessed by XRD are Ti and titanium oxides [13]. The use of this waste as alternative aggregate in portland cement composites determines the increase of mechanical strengths both at early (3 days) and longer hardening times (28 days) [13].…”

Section: Experimental Part Materials and Methodsmentioning

confidence: 99%

“…This waste has a high amount of Ti (44%) and Al (13%); the main compounds assessed by XRD are Ti and titanium oxides [13]. The use of this waste as alternative aggregate in portland cement composites determines the increase of mechanical strengths both at early (3 days) and longer hardening times (28 days) [13]. SEM images of this waste (W) are presented in figure 2.…”

Section: Experimental Part Materials and Methodsmentioning

confidence: 99%

“…SEM images of this waste (W) are presented in figure 2. As it can be seen, this waste contains big agglomerates of smaller grains as well as hollow of porous microspheres ( fig.2c) formed due to the partial melting of titanium alloy [13]. Both aggregates (S and W) had the following particle size distribution: 11% -below 0.15 mm; 22% between 0.15-0.5 mm; 33.5% between 0.5-1 mm and 33.5% between 1-2 mm.…”

Section: Experimental Part Materials and Methodsmentioning

confidence: 99%

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Alkali Activated Mortars with Intumescent Properties

Nicoara¹,

Bădănoiu²,

Balanoiu³

et al. 2019

Rev. Chim.

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The paper presents the properties of a new type of alkali activated borosilicate inorganic polymers (AABSIPs) resulted by the activation of waste glass powder and fly ash with alkaline solutions. The alkali activators used in this study were mixtures of borax decahydrate with NaOH and KOH solutions. For the preparation of AABSIP mortars two types of aggregates were used i.e. sand and a waste resulted during the mechanical processing of titanium alloy ingots. The thermal treatment of these pastes and mortars determines an intumescent process i.e. significant increase of volume; consequently, these materials could be used as low-cost fire stopper blocks for passive fire protection of buildings.

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Titanium industrial residues surface modification towards its reuse as antimicrobial surfaces

Ungureanu

Barbulescu

Dumitriu

et al. 2021

Environ Sci Pollut Res

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Residual titanium flakes as a novel material for retention and recovery of rare earth and relatively rare earth elements

Cited by 6 publications

References 41 publications

Brick and Glass Waste Valorisation in the Manufacture of Aerated Autoclaved Concrete

Brick and Glass Waste Valorisation in the Manufacture of Aerated Autoclaved Concrete

Alkali Activated Mortars with Intumescent Properties

Titanium industrial residues surface modification towards its reuse as antimicrobial surfaces

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