Removal of Cesium from Radioactive Waste Liquids Using Geomaterials …
The Portland cement paste was produced with a mixture of water and cement at a ratio of 0.5. The fly ash-based geomaterial was produced from a mixture of liquid (alkali activator) and solid (fly ash) at a ratio of 0.5. A mixture of a 9M NaOH solution and a sodium silicate solution at a weight ratio of 1:1 was used as an alkali activator.
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Effects of Nano-CSH on the hydration process and mechanical property …
Nanomaterials are widely used in cement to improve the various properties of cement-based materials. Nano-CSH is considered as an effective accelerator for the hydration of cement. This paper studied the effects of nano-CSH on the hydration behavior and compressive strength of cementitious materials with various mineral admixtures.
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TRAPPING CHARACTERISTICS FOR GASEOUS CESIUM …
material of concrete [4, 5]. It was recently suggested by Park, et al., that fly ash could be used as the raw material for ... Experiments are performed to evaluate trapping characteristics of gaseous cesium with fly ash filters in a two-zone furnace of 50 mm I.D. alumina tube under air and hydrogen conditions. X ray Diffractometry Analyzer ...
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Frontiers | Influence of CaO Content on the Fly Ash–Lime …
As a substitute for traditional Portland cement, the development and research of "low-temperature-synthesized fly ash cement" has been receiving extensive attention. This study explores the effects of calcium oxide content on the fly ash–lime system hydrothermal synthesis reaction under autoclave curing, focusing on the effects of CaO content on the …
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Assessment the leaching characteristics and long
Assessment the leaching characteristics and long-term leaching behavior of some radionuclides from synthesized zeolite cement matrix | Semantic Scholar. DOI: …
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CN103946924A
The invention provides a method for removing, at a low cost, radioactive cesium from wastes containing radioactive cesium, and a facility therefor. The facility (1) for the removal of radioactive cesium, is provided with: an incinerator (22) for burning and incinerating combustible wastes which are contaminated with radioactive cesium; a suspension …
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Calculation of the gamma radiation shielding efficiency of cement …
In comparison to the cement paste solely, the cement-bitumen composites have a greater photon attenuation coefficient. It is suggested that new compositions can be used as shielding material for dual photon protection and would be recommended in casting containers of thickness 6 cm for embedding the cesium ( 137 Cs) and cobalt ( 60 Co) as …
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Preferential removal and immobilization of stable and
In this work, the capability of nanometallic Ca/CaO methanol suspension in removing and/or immobilizing stable (133 Cs) and radioactive cesium species (134 Cs and 137 Cs) in contaminated fly ash was investigated.After a first methanol and second water washing yielded only 45% of 133 Cs removal. While, after a first methanol washing, …
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Conditioning of simulated cesium radionuclides in NaOH
Fly ash-based geopolymer (FA-GP) specimens were synthesized by activating class-F type fly ash with homogenous solutions containing 5 M NaOH and 20 wt.% Cs in the form of CsOH.H 2 O. FA-GP ...
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Diffusion of Chloride and Cesium Ions in Portland …
Title: Diffusion of Chloride and Cesium Ions in Portland Cement Pastes and Mortars Containing Blast Furnace Slag and Fly Ash. Author (s): D. M. Roy, A. Kumar, and J. P. …
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Effect of the starting fly ash on the microstructure and …
The effect of two kinds of Spanish fly ashes ASTM (class F) on the mechanical and microstructure parameters of fly ash–belite cement (FABC) mortars was studied for up to 200 days from mixing. Pore-size distribution analyses were carried out by mercury intrusion porosimetry, and microstructure was investigated by scanning electron …
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Applied Sciences | Free Full-Text | Leaching Behavior …
Szajerski, P.; Bogobowicz, A.; Bem, H.; Gasiorowski, A. Quantitative evaluation and leaching behavior of cobalt immobilized in sulfur polymer concrete composites based on lignite fly ash, slag and …
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Quantitative cesium speciation and leaching properties in …
There is an urgent need to dispose safely of the municipal solid waste incineration fly ash (MSWIFA) contaminated by cesium (Cs) released from the Fukushima Daiichi nuclear power plant accidents. This study investigated the relationship between quantitative Cs speciation and Cs immobilization in composite product from alkali …
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Pipe Materials: Asbestos Cement | Books | Vol MOP 134, No
Asbestos cement (AC) pipe comprises a mixture of portland cement (or cementitious materials) and asbestos fibers, with or without silica. AC pipe installed in North America is typically manufactured to ASTM C500 specifications as either Type I or Type II pipe. AC pipe is mainly used for potable water mains that are 24 in. and less in diameter ...
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Study on the effectiveness of silica fume-derived activator as …
So the properties of fly ash (FA)-based geopolymers activated by AWG were studied, comparing with that activated by NaOH and traditional alkali activators (water glass and NaOH). ... Compared with cement materials, the preparation process of geopolymer does not include the sintering process [2]. In fact, for every ton of cement production ...
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Analysis of melting reconstruction treatment and …
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The cement solidification of municipal solid wasteWebCesium dosage and curing time affected cesium immobilization in fly ash geopolymers. • High cesium dosage (≥8 wt.%) aided formation of in-situ pollucite in …
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Effect of cement incorporation on the leaching characteristics …
Inclusion of cement in fly ash and slag mixed soils could potentially alter the leaching behavior of elements. This study investigated the leaching characteristics of calcium (Ca), magnesium (Mg), sulfur (S), manganese (Mn), barium (Ba) and chromium (Cr) from cement activated soil-fly ash, soil-slag mixtures and soil, fly ash, steel slag and …
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Diffusion of Chloride and Cesium Ions in Portland Cement …
Title: Diffusion of Chloride and Cesium Ions in Portland Cement Pastes and Mortars Containing Blast Furnace Slag and Fly Ash Author(s): D. M. Roy, A. Kumar, and J. P. Rhodes Publication: Symposium Paper Volume: 91 Issue: Appears on pages(s): 1423-1444 Keywords: blast furnace slag; blended cements; cement pastes; cesium; chlorides; …
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Applied Sciences | Free Full-Text | Leaching Behavior of Cesium …
Leaching Behavior of Cesium, Strontium, Cobalt, and Europium from Immobilized Cement Matrix . by Ja-Young Goo. Ja-Young Goo. Scilit Preprints Google Scholar View Publications ... S. Leaching Study in Immobilization of Cesium and Cobalt Radionuclides in Fly Ash-Zeolite Cement. Arab. J. Nucl. Sci. Appl. 2013, 46, 52–62. …
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The mechanism of cesium immobilization in densified silica …
Results of an investigation are reported here in which 30 percent portland cement in concrete was replaced by an equal volume of fly ash, condensed silica-fume, or a 50:50 mixture of the two. Sand-to-gravel proportions were adjusted to obtain workable concretes having the same water-cement ratio.
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Analysis of melting reconstruction treatment and cement
High temperature melting treatment and cement solidification are technologies currently used to reduce the leaching of heavy metals in municipal solid waste incinerator (MSWI) fly ash. In this paper, to ascertain the feasibility of melting MSWI fly ash with blast furnace (BF) slag, ultra-risk MSWI(U-MSWI) fly ash having high heavy metal …
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Leaching of immobilized cesium from NaOH …
Abstract. This study investigated the effects of cesium (Cs) dosage (2–20 wt.%) and curing time (7–180 days) on the leaching behavior and immobilization of Cs in …
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Leachability of chelated ion-exchange resins solidified in cement …
Pore structure characteristics affecting the permeability of cement paste containing fly ash. Cement and Concrete Research (1985) P. Cote et al. Long-term leaching scenarios for cement-based waste forms. Waste Management & Research ... Leaching behavior of cesium, strontium, cobalt, and europium from immobilized cement …
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Mineralogy and Chemical Composition of High-Calcium Fly …
The major calcium-bearing minerals in low temperature ash (LTA) of the feed coal, lignite from the Yunnan province, include calcite, bassanite, and dolomite. The fly ashes examined contained aluminosilicates with a high concentration of calcium oxide. The major minerals include mullite, quartz, lime, anhydrite, and gehlenite, and the minor ...
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Adsorption of cesium on cement mortar from aqueous solutions
Experiments were carried out in a range of initial cesium concentrations from 0.0103 to 10.88 mg L (-1) and temperatures from 278 to 313 K using coupons of cement mortar immersed in the solutions ...
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Immobilization of Radionuclide 133Cs by …
The radionuclide cesium (Cs) was solidified using magnesium silicate hydrate (M–S–H) cement. The influence of Cs+ on the reaction of the M–S–H gel system was evaluated by measuring the …
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Reactions of Main Group Elements with Carbonates
Group 1: Alkali Metals and Carbonates (X 2 CO 3) is the reaction between Li, Na, K, Rb and Cs with CO 3. All except Lithium are soluble in water and stable to heat. Lithium Carbonate (Li2CO3) Uses: drug development. Chemical Characteristics: Low solubility in water. Unstable to heat. Appearance: white powder, fragrance-free.
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(PDF) Modelling the Long Term Leaching Behaviour of …
Results of an investigation are reported here in which 30 percent portland cement in concrete was replaced by an equal volume of fly ash, condensed silica-fume, or a 50:50 mixture of the two.
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Immobilization of cesium in fly ash-silica fume based
Request PDF | Immobilization of cesium in fly ash-silica fume based geopolymers with different Si/Al molar ratios | Geopolymers are considered as promising matrixes for waste solidification ...
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A review on the utilization of municipal solid waste
The prerequisite for using a high dosage of MSWI bottom ash in blended cement pastes and alkali-activated pastes is to improve the quality of MSWI bottom ash through pre-treatments. Although different methods have been proposed to improve the quality of MSWI bottom ash, there is no systematic guidance for the selection of quality …
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