Concrete and cement composites used for radioactive waste ...

After characterization, the radwaste is processed, stored and ultimately disposed. Processing is composed of pre-treatment, treatment technologies (such as volume reduction, chemical modification, evaporation etc.) and conditioning. Conditioning transforms the waste into a form suitable for handling and storage including immobilization.

Calcination - Wikipedia

The process of calcination derives its name from the Latin calcinare (to burn lime) due to its most common application, the decomposition of calcium carbonate to calcium oxide and carbon dioxide, in order to create cement.The product of calcination is usually referred to in general as "calcine", regardless of the actual minerals undergoing thermal treatment.

Deep Sea Drilling Project Initial Reports Volume 47 Part 1

Zeolite and opal-CT only in some altered ash layers — siliceous organisms = opal-A Minor CaCO3 cementation in forams Strong CaCO-> cementation in forams (autochthon) and sandstones; replacement calcite in tuffs Zeolite in altered tuffs, lapillistones and non-volcanogenic sediments Zeolite and opal-CT only in non-volcanogen facies Downhol e ...

CN104751928A - Method for solidifying radioactive waste ...

The invention belongs to the field of radioactive waste processing technologies, and particularly relates to a method for solidifying radioactive waste organic solvent through an adsorption-solidification method. According to the method, sulphoaluminate cement, zeolite, silica fumes and slaked lime are evenly mixed, and an obtained mixture, the radioactive waste organic solvent adsorbed by oil ...

Advances in cement solidification ... - KMI Zeolite

chemically treated zeolites to the cement were done by Bagosi [21]. They got the conclusion that addition of natural zeolites decreasedCsreleasebyupto70–75%(ofthequantityoriginally bound in the resin) in the course of a 3-year leaching period. In order to reduce the leaching rates, kaolin clay was added into cement by Osmanlioglu [23].

Metal Finishing and Processing

with a forward mixed second-order process coupled with a reverse first-order process. Bowers et a!31 demonstrated that scrap iron filings reduced hexavalent chromium in acidic solutions at a cost lower than conventional reducing agents. In addition, the solubilized iron improved the settleability and specific resistance of the resultant

Technical Reports Series No.

process applications. Taking this into account, it was decided to review and update the IAEA's publications on these subjects and prepare a new report that would reflect the existing state of the art of the application of ion exchange processes for liquid radioactive waste treatments and of the management of spent ion exchange media.

Joint IAEA-ICTP Virtual School Highlights Global Interest ...

Cementation involves the mixing of radioactive waste in a specialized cement formulated to immobilize the radionuclides and limit their release during disposal. It is a well-established and proven process for preparing radioactive waste for storage and disposal.

Zeolite Mineral Groups |Properties, Occurrence, Uses ...

Synthetic zeolites are used as additives in the production process of warm mix asphalt concrete. When added to Portland cement as a pozzolan, they can reduce chloride permeability and improve workability. They help reduce the weight and provide slower drying and help with moderate water content, which increases fracture strength.

IAEA-SM-357/17 RADIOACTIVE WASTE TREATMENT …

During vitrification, the process, the waste material is melted at temperatures about 1000°C with glass-forming material, resulting in a product with very low leachability. The volume reduction is very good. 4.1.4. Bituminisation at Dukovany NPP Liquid radwaste bituminisation is the process used in the Dukovany radioactive waste treatment ...

(PDF) Treatment of radioactive liquid waste by sorption on ...

tives in cementation process does not cause any decrease on the ... (a kind of new cement)-zeolite blends. ... This paper presents results of a study of the liquid radwaste treatment and boron ...

ACUERDO 0011 DEL INPEC PDF

The study evaluate an inorganic ion exchange to process the low level liquid radwaste of PWR nuclear plants, so that the level of the radioactivity in the effluents and the solid waste produced during the treatment of these liquid radwaste can be reduced. ... The results also showed that a bed combining zeolite and resin can process more volume ...

A Review of the Chemistry, Structure, Properties and ...

Zeolites have been used in the separation of straight-chain hydrocarbons from branched-chain hydrocarbons [27], chemical sensors [45] in industrial process control, environmental and indoor air-quality monitoring, effluent and auto-exhaust control, medical monitoring [5], air separation [46] and removal of heavy metals [47] to mention but a few.

Alteration of Sediments by Hyperalkaline K-Rich Cement ...

1 Alteration of Sediments by Hyperalkaline K-Rich Cement Leachate: Implications for Strontium Adsorption and Incorporation Sarah H. Wallace1, Samuel Shaw1, 2, Katherine Morris, Joe S. Small3 and Ian T. Burke1* 1Earth Surface Science Institute, School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK. *Corresponding Author's E-mail: [email protected]; Phone: +44 113 ...

Hot Isostatic Press (Hip) Vitrification of Radwaste ...

Hot Isostatic Press (Hip) Vitrification of Radwaste Concretes - Volume 412. Skip to main content Accessibility help We use cookies to distinguish you from other users and to provide you with a better experience on our websites.

CN1469780A - Process for extracting and purifying ...

A process for extracting and purifying naturally occurring zeolite from ores in the presence of other mineral phases by using mechanical dispersion and differential suspension to remove a majority of the clay content of the ore. The process continues by removal of contaminants with a higher mass to surface area ratio than that of the desired zeolite product by employing the properties of ...

'Symposium on Waste Management ; 1992 (Tucson, Ariz ...

DestructionofFerrocyanideCompoundsFoundintheHanfordSite's RadioactiveWaste 1327 5-4. Colby TheSequentialDecontaminationof anAbandonedUraniumFabricationFacility 1331 R ...

A Survey of the Available Methods of Solidification for ...

The WPC radwaste solidification process yields a liquid-free (less than 0.5$) solid using a continuous, fully automatic process with a multi-screw compounding extruder. The extruder-evaporator simultaneously provides homogenous mixing (including reagent additives), liquid evaporation and solidification in one machine.

A two-stage treatment process for the management of ...

This process utilizes the mediation of biological substances to induce the cementation in situ, thereby enhancing the strength and stiffness of soils (DeJong et al. 2010; Kakelar and Ebrahimi 2016). In MICP by urea hydrolysis, urease-producing bacteria are employed to catalyze the hydrolysis of urea into carbonate and ammonium (Eq. 1). Produced ...

Developing Technologies for Nuclear Fuel Cycles

High-performance Cement Solidification2, 3) The most important technology in the radwaste treatment system is the volume reduction subsystem. Figs. 6 and 7 outline the concept and the technique of the new solidification process. One simple system, similar to a conventional cement solidification unit, can treat liquid waste, spent ion exchange ...

JOURNAL OF MATERIALS SCIENCE 39 (2004) 481– 488 Binders ...

rial. Using zeolites for the management of radioac-tive waste is not a new concept, but a process by which formed in situ zeolites act both as a host phase and a cementitious binder phase for radioactive waste ions is. 2. Hydroceramics Zeolitic materials are relatively easy to synthesize from a wide range of starting materials. The process under

RADIOACTIVE WASTE SOLIDIFICATION

pressure process which results in molecules that contain long and short branch chains which interfere with the close approach ofthe molecules and hence produce a product oflower crystallinity. Typical highlensity polyethylene has a softening point ofabout 12?C, while lowdensity polyethylene softens at about 86°C. Polyethylene products are

NEW SYSTEM INSTALLED FOR NUCLIDE REMOVAL AND …

the ion exchanger. For example, if zeolite is used instead of CsTreat® for removal of cesium, even in moderately low salt concentration the amount of zeolite can be thousands times bigger than the amount of CsTreat®. The demineralizer system itself can be very advantageous compared to evaporation and cementation.

Hydroceramics, a "new" cementitious waste form material ...

A "hydroceramic" (HC) is a concrete which possesses mineralogy similar to the zeolitized rock indigenous to the USA's current "basis" high level radioactive waste (HLW) repository site, Yucca Mountain (YM). It is made by curing a mixture of inorganic waste, calcined clay, vermiculite, Na2S, NaOH, plus water under hydrothermal conditions. The product differs from conventional Portland cement ...

CEMENTATION OF RADIOACTIVE WASTE FROM A PWR WITH …

The purpose of solidification is to isolate radioactive or hazardous waste from the environment by fixing the waste into cement-based or pozzolan-based solidified systems. In these systems the wastes are physically encapsulated and/or chemically bound.

33 Zeolite Concentration Effect To investigate the effect ...

3.3 Zeolite Concentration Effect To investigate the effect of the zeolite content on composite membrane properties and gas separation performance, membrane samples with different ratios of natural zeolite to cement were prepared and tested. Figure 6 shows the effect of the weight ratio of clinoptilolite to Portland cement on hydrogen permeance at 25 º C and various trans-membrane pressures.

MRS Online Proceedings Library (OPL): Volume 663 ...

The advantages of the process using BPN for removing and immobilizing Iodine-129 were discussed from the standpoint of process simplification. ... after 12 months in the slag-containing cement. Pre- incorporation of Cs in various zeolites, followed by mixing the zeolites into the cement, leads to enhanced Cs retention in the cement when it is ...

THOREX processing and zeolite transfer for high-level ...

THOREX processing and zeolite transfer for high-level waste stream processing blending

7 Sedimentary Minerals and Sedimentary Rocks – Mineralogy

Cementation by quartz, calcite, or hematite may be part of the lithification process. It also may be considered a diagenetic process. Similarly, the formation of many low-temperature minerals such as zeolites, a normal part of diagenesis, overlaps with the beginnings of metamorphism.

Solidification of radioactive wastes by cement-based ...

Radioactive concentrates, radioactive organic solvents, and spent ion exchange resins are the main wastes generated by the current pressurized water reactor (PWR) in nuclear power plants, which are the major radioactive waste required for cementation. 2.1. Radioactive concentrates

Zeolites for Detergents

production process, Zeolite X was recently introduced into the market for detergents [6]. Like ZeoliteP, the chemical composition of this zeolite is also virtually identical to that of Zeolite A. As with Zeolite A, the basic building blocks of Zeolite X are cubo-octahedrons, which are …

Volumes | International Conference on Radioactive Waste ...

The Evolving Process of Plutonium Contaminated Equipment D&D. David K. Nichols. ICEM 2003; ... The British Radwaste Information Management System (BRIMS) Ian Upshall. ... Application of the Dry Polyfunctional Additives at Radioactive Waste Cementation. Andrey P. Varlakov, Konstantin M. Efimov, Valeri N. Tchernonojkine, ...

Rev 12 to 'DPC Process Control Program Manual.'

radwaste facility ventilation system and any decanted liquid is processed as required by the station liquid radwaste systems. 1.3.1.1. A "Mixed waste" is waste that is both radioactive and hazardous as defined by EPA regulations in 40CFR26 1. Solidification of these wastes per the Process

PreparationandCharacterizationofChabazitefromConstruction ...

The premise of using waste to synthesize zeolite is to study the characteristics and synthesis parameters of waste in order to produce pure and stable zeolite, which is suitable for industrial application. After primary analysis, the con-struction waste used in this study mainly consists of cement blocks,bricks,andasmallamountofsand.Basedonitscom-

RadWaste.org - Radwaste processing

Processing. The processing of radioactive wastes may be done for economic reasons (e.g. to reduce the volume for storage or disposal, or to recover a "resource" from the waste), or safety reasons (e.g. converting the waste to a more "stable" form, such as one that will contain the radionuclide inventory for a long time).