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- 저자 : Davaabal, B. (검색결과 3 건)
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Ulambayar Rentsennorov,Batmunkh Davaabal,Bayaraa Dovchin,JadambaaTemuujin 한양대학교 세라믹연구소 2021 Journal of Ceramic Processing Research Vol.22 No.2
In this work, the potential application of using zeolite A synthesized from fly ash to remove Cr (III) from aqueous solutionswas studied. Zeolite A was synthesized from acid-washed fly ash by alkali fusion followed by hydrothermal treatment. The acidwashing removed Ca and Fe from the fly ash, which allowed synthesis of the required zeolite. The acid-washed fly ash andNaOH were mixed at a mass ratio of 1:1.2 and heated at various temperatures. The hydrothermal zeolite synthesis was carriedout at 600 oC temperature and the product characterized by X-ray diffraction (XRD) and Scanning Electron Microscopy(SEM). The zeolite achieved maximum adsorption capacity of Cr (III) attaining equilibrium within 30 min at pH 4.0. Theadsorption isotherm for Cr (III) on this zeolite A was tested and showed that the adsorption data of Cr (III) were fitted bestby a Langmuir isotherm.
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INFLUENCE OF BASALT FIBRES ON THE PROPERTIES OF FLY ASH BASED GEOPOLYMER BINDER
Temuujin, J.,Minjigmaa, A.,Davaabal, B.,Darkhijav, B.,Ruescher, C.H. Korean Association for Particle and Aerosol Resear 2016 Particle and Aerosol Research Vol.12 No.2
The influence of basalt fibres on the compressive strength of the geopolymer type binders has been studied. For the experiments 2 types of the basalt fibres were used, namely chopped and spooled fibres. Both types of basalt fibres were 7-10 micron thick in diameter and cut into pieces of 6 mm length. The fibres were mixed with 1% weight to the fly ash powder, followed by the addition of the activator solution (8M NaOH). The pastes obtained were cured at $70^{\circ}C$ for 20 h revealing compact bodies. Compressive strength was measured after 7 days and microstructure observation performed with SEM. The cube bodies ($2{\times}2{\times}2cm$) reveal compressive strength of 47.25(4.03) MPa, while it decreased to 34.0(9.05) MPa in spooled basalt fibres and to 17.33(5.86) MPa in the chopped basalt fibres containing binder, i.e 76% and 36% of the strength without fibres, respectively. The much weaker compressive strength of the chopped fibres containing binder is related to the absence of significant adhesion between the geopolymer binder and the basalt fibres, forming voids instead. Alkali leaching effect of basalt fibres could probably explain the drop in the compressive strength with spooled and chopped fibres, respectively.
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A. Minjigmaa,G. Oyun-Erdene,Ts. Zolzaya,B. Davaabal,J. Amgalan,J. Temuujin 한국자원공학회 2016 Geosystem engineering Vol.19 No.3
Phosphorus is one of the most important nutrients for plant growth. The main compounds containing phosphorus are natural phosphate minerals such as apatite. However, the solubility of apatite is low in the humic acid in soil. Therefore, phosphorus is applied as a fertilizer for plant growth. Generally, fluorapatite Ca5(PO4)3F is used for the preparation of phosphorus fertilizer such as superphosphate. Mongolia is rich in phosphorus reserves which are distributed between two phosphate basins at Khuvsgul (4.5 billion tonnes) and Zavkhan (1.2 billion tonnes). However, preparation of phosphorus fertilizer from natural fluorapatite, by a wet chemical method raises health and ecological concerns. Therefore, we have mechanically treated phosphorite from the Burenkhaan deposit in order to prepare fertilizer by a dry method. Phosphate samples were milled in a vibratory ball mill for 15–120 min. Raw and milled samples were characterized by XRD, FTIR, particle size analyzer and SEM. The efficacy of mechanical activation was determined by solubility of milled phosphate in a 2% citric acid solution. Mechanical activation results in a threefold increase in solubility of phosphorus in citric acid solution to 18%. Such solubility is comparable with the superphosphate prepared by the wet chemical method.
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