Radiological and physicochemical properties of red mud based geopolymers

Bošković, Ivana; Nenadović, Snežana; Kljajević, Ljiljana; Vukanac, Ivana; Stanković, Nadežda G.; Luković, Jelena; Vukčević, Milan

doi:10.2298/ntrp1802188b

Cited by 12 publications

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“…The leaching products are sodium aluminate solution and a residue called red mud (RM). The latter is mainly composed of iron oxides, quartz, sodium aluminosilicates, calcium carbonate, aluminate, titanium dioxide, and traces of other metallic oxides [5,6]. Once the RM is separated from the sodium aluminate solution, it is stored in open ponds in the form of liquid-solid suspension.…”

Section: Introductionmentioning

confidence: 99%

Red Mud-Blast Furnace Slag-Based Alkali-Activated Materials

et al. 2021

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The aluminum Bayer production process is widespread all over the world. One of the waste products of the Bayer process is a basic aluminosilicate bauxite residue called red mud. The aluminosilicate nature of red mud makes it suitable as a precursor for alkali-activated materials. In this work, red mud was mixed with different percentages of blast furnace slag and then activated by sodium silicate solution at different SiO2/Na2O ratios. Obtained samples were characterized by chemical–physical analyses and compressive strength determination. Very high values of compressive strength, up to 50 MPa, even for high percentage of red mud in the raw mixture (70 wt.% of RM in powder mixture), were obtained. In particular, the higher compressive strength was measured for cubic samples containing 50 wt.% of RM, which showed a value above 70 MPa. The obtained mixtures were characterized by no or scarce environmental impact and could be used in the construction industry as an alternative to cementitious and ceramic materials.

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Section: Introductionmentioning

confidence: 99%

Red Mud-Blast Furnace Slag-Based Alkali-Activated Materials

et al. 2021

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“…Hence, ash compositions vary over a wide range. The most important development in the field of coal combustion products (CCP) utilization in Europe in 2004 was the approval of a revised European standard on fly ash for concrete [1][2][3][4][5][6][7][8]. The standard covers siliceous fly ash and includes for the first time fly ash obtained from co-combustion of coal and certain cocombustion materials.…”

Section: Introductionmentioning

confidence: 99%

Alkali activation of different type of ash as a production of combustion process

et al. 2021

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Presented study deals with the final structure and radiological properties of different fly ash-based geopolymers. lignite fly-ash (lignite Kolubara - Serbia) and wood fly ash were obtained in combustion process together with commercial fly ash. Synthesis of the geopolymers was conducted by mixing fly ash, sodium silicate solution, NaOH and water. The samples were cured at 60?C for 48h after staying at room temperature in covering mold for 24 h. X - ray diffraction, Fourier transform infra - red and Scanning electron microscope measurements were conducted on the samples after 28 days of geopolymerization process. X-ray diffraction measurements of lignite fly ash samples show anhydrite as the main constituent, while wood fly ash samples consist of calcite, albite and gypsum minerals. Beside of determination of physical-chemical properties, the aim of this study was radiological characterization of lignite fly ash, wood fly ash and the obtained geopolymer products. Activity concentration of 40K and radionuclides from the 238U and 232Th decay series in ash samples and fly ash-based geopolymers were determined by means of gamma-ray spectrometry, and the absorbed dose rate rate (D) and the annual effective dose rate (E) were calculated in accordance with the UNSCEAR 2000 report.

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“…Min er al og i cal com po si tion of the RM de pends on the min eral com po si tion of the source ma te rialbaux ite, a multiphase ore that may con tain more than a hun dred min er als of var i ous grind ing fine ness and decom po si tion [17]. The min er als con tain ing of alu minum, iron, sil i con, ti ta nium, cal cium, mag ne sium are es sen tial con stit u ents.…”

Section: The Xrd Analysisunclassified

“…The min er als con tain ing of alu minum, iron, sil i con, ti ta nium, cal cium, mag ne sium are es sen tial con stit u ents. De pend ing on the type of mineral de pos its, the amounts of the es sen tial and ac cessory min er als may vary within wide ranges [17,18]. Fig ure 1 shows the XRD pat terns of BHRM, and al kali ac ti vated ma te ri als -IBBHRM.…”

Section: The Xrd Analysismentioning

confidence: 99%

Radiological and physico-chemical characterization of red mud as an Al-containing precursor in inorganic binders for the building industry

et al. 2021

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The potential re-use of red mud in the building and construction industry has been the subject of research of many scientists. The presented research is a contribution to the potential solution of this environmental issue through the synthesis of potential construction materials based on red mud. A promising way of recycling these secondary raw materials is the synthesis of alkali-activated binders or alkali activated materials. Alkali-activated materials or inorganic binders based on red mud are a new class of materials obtained by activation of inorganic precursors mainly constituted by silica, alumina and low content of calcium oxide. Since red mud contains radioactive elements like 226Ra and 232Th, this may be a problem for its further utilization. The content of naturally occurring radionuclides in manufactured material products with potential application in the building and construction industry is important from the standpoint of radiation protection. Gamma radiation of the primordial radionuclides, 40K and members of the uranium and thorium series, increases the external gamma dose rate. However, more and more precedence is being given to limiting the radiological dose originating from building materials on the population these days. The aim of this research was to investigate the possible influence of alkali activation-polymerization processes on the natural radioactivity of alkali activated materials synthesized by red mud (BOKSIT a. d. Milici, Zvornik, Bosnia and Herzegovina) and their structural properties. This research confirmed that during the polymerization process the natural radioactivity was reduced, and that the process of alkali activation of raw materials has an influence on natural radioactivity of synthesized materials.

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Radiological and physicochemical properties of red mud based geopolymers

Abstract: part ment of Ma te ri als Sci ence, Vin~a In sti tute of Nu clear Sci ences, Uni ver sity of Bel grade, Bel grade, Ser bia 3 De part ment of Ra di a tion and En vi ron men tal Pro tec tion, Vin~a In sti tute of Nu clear Sci ences, Bel grade, Ser bia Sci en tific pa per

Cited by 12 publications

References 14 publications

Red Mud-Blast Furnace Slag-Based Alkali-Activated Materials

Red Mud-Blast Furnace Slag-Based Alkali-Activated Materials

Alkali activation of different type of ash as a production of combustion process

Radiological and physico-chemical characterization of red mud as an Al-containing precursor in inorganic binders for the building industry

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