Cobalt atau di Indonesia ditulis dengan nama "Kobalt" merupakan senyawa unsur logam dengan simbol periodik kimia Co dan nomor atom 27. Seperti nikel, kobalt ditemukan di kerak bumi hanya dalam bentuk gabungan kimiawi, kecuali deposit kecil yang ditemukan dalam paduan besi meteorik alam. Unsur bebas ini juga bisa dihasilkan …Web
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Abstract. As Kd from radwaste elements in concrete systems show a wide range of values, a modelling of cesium and lead immobilization in Calcium Silicate Hydrate (CSH, xCaO.SiO {sub 2}.H {sub 2}O, with 0.7 (aged cements)
Conclusion. This paper presented results of immobilization of cesium and strontium radionuclides loaded zeolite A ion exchange material in a mixture with OPC. The results showed that addition of up to 4 wt.% contaminated zeolite A leads to increase the compressive strength of the final solid matrix form 56.2 MPa in plain samples to 72.7 …Web
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Ordinary Portland cement (OPC) was used as an immobilization agent. During the test, leaching of the nuclides occurred in the order of Cs, Sr, Co, and Eu and decreased over time. The results showed that 41.4% of the total Cs leached over 90 days, although the other elements leached in quantities less than 1.5%. ... Leaching Behavior …Web
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Adsorption of cesium on cement mortar from aqueous solutions. The adsorption of cesium on cement mortar from aqueous solutions was studied in series of …Web
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A study on the Cs migration in cement-base materials, and the effect of highly concentrated saline solutions, is presented on the basis of retention measurements and diffusion tests. …Web
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This study reports on the efficacy of various wash solution formulations in removing cesium from components of concrete. We identified several prevalent mineral …Web
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The efficiency of innovative matrices for immobilizing cesium is presented in this work. The matrix formulation included the use of fly ash belite cement (FABC-2-W) and gismondine-type Na-P1 zeolite, both of which are synthesized from fly ash of coal combustion. The efficiency for immobilizing cesium is evaluated from the leaching test …Web
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Immobilization of cesium has received considerable attention due to the low sorption potential of cement towards cesium and its solubility in the cementitious matrices. Different natural and synthetic materials that have high sorption potential towards cesium were tested to check their feasibility to reduce Cs leaching from the cementitious ...Web
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Ringkasan. Cobalt adalah logam yang terdapat di alam, biaa digunakan untuk membuat baja, keramik, semen, , hingga barang dari kulit; Manfaat cobalt dapat membantu mencegah anemia pernisiosa. Kobalt juga mampu mengakitfkan beberapa jenis enzim dalam tubuh; Penggunaan kobalt klorida 1 mg per hari selama 90 hari dilaporkan aman.Web
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Proses pembuatan semen terdiri dari lima tahap, yaitu sebagai berikut: Penyediaan bahan baku. Bahan baku utama yang digunakan untuk kegiatan produksi semen adalah batu kapur sekitar 75 - 90 % dan tanah liat sekitar 7 - 20 %, sedangkan bahan baku koreksi berupa pasir besi sekitar 1 - 3 % dan pasir silika 1 - 6 %.Web
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2.7.. Static leaching testStatic leaching tests were preformed, using ground water solution, to study the leaching of cesium and strontium ions from hardened blocks of cement and cement mixed with 4 wt.% synthetic zeolite A.The IAEA's standard test proposed by Hespe [15] was applied. All prepared samples (2.0 cm diameter and 2.0 cm …Web
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Cs and Pb uptake by CSH phases of hydrated cement. Material Research Society Symposium Proceedings, 663, 105-113] for Cs sorption on synthetic CSH phases was simplified to facilitate its application to whole HCP and mortars or concrete, following re-assessment of the model parameters. All measurements were compared with model …Web
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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 compressive strength and microscopic properties of the solidified body. By testing the impact resistance, leaching resistance and freeze–thaw …Web
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Abstract. As Kd from radwaste elements in concrete systems show a wide range of values, a modelling of cesium and lead immobilization in Calcium Silicate …Web
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Overall between 5 and 59% of cesium was adsorbed on cement mortar at equilibrium. The quantities of adsorbed Cs at equilibrium ranged from 0.0395 to 22.34 μg cesium/cm 2 of coupon surface. At the same time, the equilibrium concentration in solution ranged from 0.0069 mg L −1 to 8.837 mg L −1.Web
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Kristal sesium (keemasan) dibandingkan dengan kristal rubidium (keperakan) Sesium dapat membentuk paduan dengan logam alkali lainnya, emas, dan raksa ( amalgam ). Pada suhu di bawah 650 °C (1.202 °F), ia tidak terpadu dengan kobalt, besi, molibdenum, nikel, platina, tantalum, atau wolfram.Web
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Abstract. The adsorption of cesium on cement mortar from aqueous solutions was studied in series of bench-scale tests. The effects of cesium concentration, …Web
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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 …Web
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To support the viability of a wash-down approach to mitigating nuclear contamination, this study presents a characterization of the aggregate of a common concrete by optical microscopy and the sorption-desorption characteristics of cesium from these into potential wash solutions. Various minerals with weathered surfaces displayed …Web
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A large quantity of radioisotopes was released by the Fukushima Daiichi nuclear power plant accident in March 2011. The radioactive materials, such as 129 Te, 132 Te, 131 I, 132 I, 134 Cs, 136 Cs, 137 Cs, 140 Ba, and 140 La, were released into the atmosphere and contaminated the air and the ground [1–3].Consequently, …Web
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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 …Web
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@article{Sami2021AssessmentTL, title={Assessment the leaching characteristics and long-term leaching behavior of some radionuclides from synthesized zeolite cement matrix}, author={Nesreen M. Sami and Ola A. Abdel Moamen and M. I. El-Dessouky and Ahmed Mohamed El-kamash}, journal={Cement and Concrete …Web
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The leaching rate of cesium has been studied in cement. The solidification matrix was a standard Portland cement with increased sulphate resisting properties mixed with 300 kg/m 3 or 350 kg/m 3 powdered ion exchange resins, and with or without 5 weight-% zeolite added to the grout. The leaching rates from an ordinary cement matrix and a …Web
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polyvinyl chloride (PVC). Concrete (or cement-mortar) is a common lining on the interior of iron drinking water pipes. PVC can be used in home plumbing and distribution system pipes. The contaminants spiked into the ARs included stable cesium (Cs)-133, cobalt (Co)-59, and strontium (Sr)-88.Web
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In this study, the adsorption kinetic of cesium, strontium, and rubidium radionuclides was investigated using ferritin magnetic molecules. Kinetic investigation of synthetic and natural wastes was carried out and the results were compared. Pseudo first-order, pseudo second-order, Elovich, double-exponential, and intraparticle diffusion …Web
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Melting points of common materials. Melting point of steel: 1425-1540 °C / 2600-2800 °F Melting point of gold: 1064 °C / 1947.5 °F Melting point of copper: 1084 °C / 1983 °F Melting point of iron: 1538 °C / 2800 °F Melting point of lead: 327.5 °C / 621 °F Melting point of silver: 961 °C / 1761 °F. Download Reference Sheet:Web
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This observation suggests that adsorption of cesium by cement mortar is an exothermic process. Slightly lower q e for 278 K (5 °C) possibly due to changes in …Web
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The adsorption of cesium from aqueous solutions on cement mortar was investigated in the range of initial cesium concentrations of 0.0103–10.88 mg L −1 and in the range of temperatures of 278–313 K. It took approximately 12 days to …Web
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The leaching behavior of cesium -134 (Cs-134) from cement mixed with 5%, 11% and 18% of biochar has been investigated accordance with the ANSI/ANS 16.1-2003 method. The leachate was collected and ...Web
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