Experimental Study on the Solidification of Uranium Tailings …

Although uranium tailings have a low average grade of uranium, ranging from 0.005% to 0.03%, the total amount of uranium present must be taken into consideration and addressed. Additionally, the long-term storage of uranium tailings causes severe radioactive pollution to the surrounding environment and results in a …

How to Stabilize Uranium Tailings

At the present time there appears to be no contamination of surface or ground water in the surrounding area from leaching of radioactive materials from the tailings area. ... The Tuba City uranium mill tailings are located on the Navajo Indian Reservation approximately 6 miles east of Tuba City, Coconino County, Ariz. The …

Research on leaching behavior of uranium from a uranium …

The results show that U is mainly present in the residue state in uranium tailings, that U release is strong in the lower pH range, that the leached U is mainly in the form of U(VI), mainly from the water-soluble, Fe/Mn oxides and exchangeable fraction of uranium tailings, and that the reduction in U leaching at higher pH is mainly due to the ...

Rapid Vitrification of Uranium Tailings Via Microwave …

In the present study, microwave sintering was used to immobilize neodymium-contaminated soil and cerium-contaminated soil in uranium tailings. The optimal doping amount of Na 2 CO 3, the ideal firing temperature, the ultimate solubility of CeO 2 and Nd 2 O 3, and the chemical durability of the solidified components were …

Uranium Mill Tailings | NRC.gov

Uranium mill tailings are primarily the sandy process waste material from a conventional uranium mill. This ore residue contains the radioactive decay products from the uranium chains (mainly the U-238 chain) and heavy metals. As defined in Title 10, …

Microbial Biogeochemistry of Uranium Mill Tailings

I. Introduction. Uranium mill tailings (UMT) are the crushed ore residues from the extraction of uranium (U) from ores. Except where ores have a high carbonate content, the commercial extraction of U from ores generally involves leaching with sulfuric acid (H 2 SO 4).The effluent (termed raffinate or barren solution) and tailings from the mill are …

Uranium Mill Tailings Wastes in Australia : Past, Present …

Uranium Mill Tailings Wastes in Australia : Past, Present and Future Management Gavin M. Mudd MAPW National Conference on Nuclear Issues 3 Canberra, ACT - August 5-6, 2000 1970s-90s t Ore Milled t U 3O 8 1950s-60s t Ore Milled t U 3O 8 Olympic Dam 35,653,100 19,663.4 Moline 137,137 713.5

Conventional Uranium Mills | NRC.gov

Mill tailings are the fine-grained, sandy waste byproduct material that remains after the milling process has extracted and concentrated the uranium from the ore. Mill tailings are typically created in slurry form during processing, and are then deposited in an impoundment or "mill tailings pile," which must be carefully regulated, monitored ...

Backgrounder on Uranium Mill Tailings | NRC.gov

Title II - Sites licensed in 1978 or later. Milling is the first step in making natural uranium ore into fuel for nuclear reactors. Uranium mills use chemicals to extract uranium and make "yellowcake," a powder that can be processed into fuel. They produce "mill tailings," a sandy waste containing heavy metals and radium, which is radioactive.

A comprehensive review of radioactive pollution treatment …

Major distribution of UMTs. The uranium mining process produces a large amount of waste rock and mill tailings. As uranium resources are depleted, the …

Ecotechnological approach for consolidation of uranium tailings

Present study has been undertaken to consolidate radioactivity in uranium mill tailings at Jaduguda, Jharkhand, India.Tailings that remain after processing of ore are released in tailing ponds specially designed for the purpose. The degraded tailing ponds have been capped with 30 cm. thick soil cover. For cosolidation of radioactivity in the ...

Consolidation Behavior of a Uranium Tailings Storage …

AbstractThe large-strain consolidation behavior of a uranium tailings storage facility was investigated by ... G., and Moldovan, B. (2010). "Evolution of tailings management in the uranium industry in northern Saskatchewan past, present and future, short course-Uranium 2010." 3rd Int. Conf. on Uranium, Canadian Institute of Mining ...

Evapotranspiration covers at uranium mill tailings sites

Beginning in the 1940s, uranium production generated enormous quantities of mill tailings as the by-product of the uranium enrichment for the development of nuclear weapons and energy. Mill and disposal sites pose an indefinite risk due to the quantity and concentration of radioactive materials in the tailings and associated waste, including ...

A Radioactive Legacy: Scars still present from Edgemont's uranium …

Nov 1, 2015 Updated Nov 7, 2016. A bright yellow sign outside of Edgemont warns of the dangers of buried uranium mill tailings. More than 4 million tons of the radioactive waste is underground at ...

Long-Term Federal Management of Uranium Mill …

The awareness of the technical and economic challenges posed during the decommissioning and long-term management of uranium mill tailings has increased since 1978. As of the third quarter of 2020, the U.S. uranium concentrate facilities consisted of one uranium mill and four ISR facilities in operation.12.

Uranium Tailings in Central Asia: The Case of the Kyrgyz …

One such problem is the presence on the territory of the Kyrgyz Republic of abandoned uranium mines and unprotected uranium tailings, waste byproducts of uranium mining, in densely populated areas prone to natural disasters and other environmental threats. ... (RDDs or "dirty bombs"), might be present inside the tailings, …

Leaching behaviour and mechanism of U, 226Ra and 210Pb from uranium

The leaching of U, 226 Ra and 210 Pb from uranium tailings was tested under different pH conditions. The release of U, 226 Ra and 210 Pb from uranium tailings is mainly from the water-soluble state. In the lower pH range, U, 226 Ra, 210 Pb in uranium tailings are leached in larger quantities with a strong release capacity. The pH affects …

Moab Marks Milestone of Moving 11 Million Tons …

MOAB, Utah – EM 's Moab Uranium Mill Tailings Remedial Action (UMTRA) Project achieved an EM 2020 priority on Oct. 19 after relocating another million tons of contaminated soil and debris away …

Evapotranspiration covers at uranium mill tailings …

First published: 15 July 2022. https://doi/10.1002/vzj2.20222. Citations: 1. Assigned to Associate Editor Tjalfe Gorm Poulsen. Sections. PDF. Tools. Share. Abstract. Waste isolation is a key strategy for mitigating risk from …

Tailings | SpringerLink

An interaction of the tailings with ground water occurs if permeable, reactive, soluble tailings materials are present. In historic mining areas, tailings were commonly discharged into nearby rivers. Today, such a disposal is applied in earthquake- and landslide-prone, rugged, high rainfall areas where the construction of engineered …

Scientific basis for risk assessment and management of uranium …

Uranium mill tailings present health and environmental concerns because of the residual radioactivity that they contain and because of a variety of other potential pollutants, such as chlorides, sulfates, and heavy metals. The milling process makes the radioactive and nonradioactive materials contained in the ore when it was mined much more ...

Uranium Mill Tailings Radiation Control Act Sites

The Uranium Mill Tailings Radiation Control Act (UMTRCA) of 1978 (Public Law 95-604) is a federal law that provides for the safe and environmentally sound disposal, long-term stabilization, and control of uranium mill tailings in a manner that minimizes or eliminates health hazards to the public. Uranium mill tailings are the residue that ...

Problem Plague Lilco's Uranium Supplier

The trouble stems from Bokum's plans to mill the uranium and dispose of 20 million tons of radioactive tailings from the ore on land leased from the people who own it in common under the terms of ...

Microscopic characterization and radon exhalation of metakaolin-uranium

Uranium tailings: It is khaki particles with black particles in the middle. The particle size distribution of the uranium tailings is shown in Fig. 1: d 50 = 5.66 μm, d 90 = 39.4 μm. The specific surface area is 2142 m 2 /kg. Table 2 shows the main chemical components, which are primarily composed of AI 2 O 3 and SiO 2, accounting for 8.4% …

'Dear Sir: Your House Is Built On Radioactive Uranium Waste'

The A.E.C., without outside consultation and without publishing any supportive data, concluded that the uranium tailings piles "present no hazard to the environment, either short term or long ...

Uranium mines and mills waste

There are 78 historic radium/uranium mines without tailings across Canada, dating from the uranium mining "boom" years (1930s to 1960s). These sites, known as idle mines, were exempted from CNSC regulation because of the low risk they present.

Radium in uranium mill tailings

Calcium sulphate present in the uranium tailings dissolves during radium leaching and this increase in the concentration of sulphate ions in the solu- 156 tion will reprecipitate radium. Silver et al. [29] found that washing off the soluble sulphates from the tailings before radium leaching helps in radium dissolution.

Molybdenum Speciation in Uranium Mine Tailings Using X …

Uranium (U) mill tailings in northern Saskatchewan, Canada, contain elevated concentrations of molybdenum (Mo). The potential for long-term (>10,000 years) mobilization of Mo from the tailings ...