Abstract. Removal of radium from uranium tailings would substantially lessen their environmental impact because it would eliminate, or greatly reduce, the hazards arising from radon emanation, leaching of radium, dust dispersal and gamma radiation. A process is described to extract radium from tailings by leaching in 3M NaCl solution.
Radium is a naturally occurring radioactive element found in nature. Radium has no non-radioactive isotopes. It is one of the products of the radioactive decay of uranium (U). The longest lived isotope is Ra-226 which is formed in the natural decay of U-238. The other major radium isotope is Ra-228. It is produced from the decay of radioactive ...
Ferric chloride leaching at temperatures in the range 47-74/sup 0/C. is found to remove up to 97% of the uranium from ores occurring in the Elliot Lake area of Canada, but radium removal was found to be poor due to the formation …
The removal rates with membrane filtration processes have been in the order of 90-99.9% for uranium [56] and for radium in the order of 43-99% (strongly dependent on the initial concentration) [13 ...
The radium leaching characteristics from both ore and sulfate-leached tailings were investigated. Several 1 M salt solutions showed poor to moderate RaSO 4 dissolution from "slimes solids" tailings, while 3 M HNO 3 or HCl solutions dissolved approximately 95% of the radium content of either ore or tailings. Tests are reported in …
DOI: 10.1016/0304-386X(83)90004-X Corpus ID: 95475670; Radium removal from elliot lake uranium-mill solids by EDTA leaching @article{Nixon1983RadiumRF, title={Radium removal from elliot lake uranium-mill solids by EDTA leaching}, author={Allen C. Nixon and D. Keller and Klaus Fritze and Alice Pidruczny and Alfio.
1. Introduction. Phosphogypsum (PG) is a hazardous waste associated with the phosphoric acid production using the wet process [1].PG is considered a relatively high level natural uranium series radionuclide material, which provokes a negative environmental impact and many restrictions on the use of the PG waste (only 15% of the …
Abstract. Mill tailings from conventional uranium extraction processes contain nearly all of the radium originally in the ore. Such tailings require controlled storage in perpetuity to …
Tests also showed that the hexametaphosphate interferes with uranium extraction from the ore and solubilizes thorium-230 and radium-226 from neutral residues left after acid leaching. This approach was tested further, and 70-80% removal of thorium and radium from the slimes (-200 mesh) fraction of the tailings was achieved.
Uranium extraction from ore involves the use of acid or base to break own and extract uranium from the raw ore. These processes require significant amounts of acids or …
Radium removal from uranium ores and mill tailings. S. Borrowman, P. T. Brooks. Published 1975. Environmental Science, Engineering. Mill tailings from conventional …
Many of the findings related to occupational exposures and adverse health outcomes presented in this chapter are based on studies of uranium and hard-rock miners (e.g., worker-based radon studies) for periods of disease risk when the magnitude of the exposures was much greater than the exposures reported at most mines and processing …
Ferric chloride leaching at temperatures in the range 47-74/sup 0/C. is found to remove up to 97% of the uranium from ores occurring in the Elliot Lake area of Canada, but …
Uranium minerals are always associated with more radioactive elements such as radium and radon in the ore which arise from the radioactive decay of uranium over a few million of years. Therefore, although uranium itself is barely radioactive, the ore which is mined, especially if it is very high-grade such as in some Canadian mines, is handled ...
It was found, that 95- of radium bound in sediments was reIeased in 1 N solutions of KCl and NaCl salts, dependent on their structure and mineralogical composition. The control of the radioactivity level of surface water contaminated by radioactive waste from uranium ore mining and processing revealed higher concentration of dissolved radium in places …
This patent describes a process for the extraction of radium from uranium mill tailings solids including the steps of contacting the tailings with a liquid leaching agent, leaching the tailings therewith and subsequently separating the leachate liquid and the leached solids. ... Removal of hazardous radionuclides from uranium ore and/or mill ...
Low Energy Gamma Spectrometry (L.E.G.S.) has proven to be a rapid and cost effective method of determining uranium, thorium and the uranium daughter products Radium-226 and Lead-214 in samples of ...
ritchie, c. f. separation of radium from uranium by co-precipitation from nitric acid solutions of pitchblende ore.united states: n. p., 1946. web. doi:10.2172/4335966.
Radium removal from uranium ores and mill tailings. U.S. Bureau of Mines, Rept. of inv. 8099. (1975) B. Havlik et al. Radium-226 liberation from uranium ore …
Uranium Extraction. Uranium leaching is the process by which the uranium is extracted from the raw ore by reacting the material with acid or base. Fig. 2 shows a general process flow for the uranium extraction …
Radium (chemical symbol Ra) is a naturally occurring radioactive metal. Radium is a radionuclide formed by the decay of uranium and thorium in the environment. The most common isotopes …
Abstract. Ferric chloride leaching, at temperatures around 74°C, is found to remove up to remove up to 97% of the uranium from ores occurring in the Elliot Lake area of Canada. Radium removal is poor due to the formation of sulphates from the sulphides present in the ore.
95% removal of 238U is also 95% removal of 235U when they are present together regardless of the ratio of their activities. Radium removal by ion-exchange softening …
Previous work on radium removal from mill tailings and on radioactive disequilibrium in uranium deposits is critically reviewed in relation to these mechanisms. …
From this concentrate the radium may be extracted and refined by any suitable method. By the procedure outlined, it is possible to get a radium concentrate carrying 50 to 100 milligrams of radium per ton of concentrate, the exact proportion depending on the grade of the ore treated. PART 1: Radium, Uranium & Vanadium …
Ferric chloride leaching, at temperatures around 74°C, is found to remove up to remove up to 97% of the uranium from ores occurring in the Elliot Lake area of Canada. Radium removal is poor due to the formation of sulphates from the sulphides present in the ore. However, if the sulphides are removed initially by flotation, then ferric …
To improve the utilisation of uranium resources while reducing the radioactive contamination of uranium slag by ^226Ra, the effects of various factors on uranium–radium co-leaching from uranium ore were investigated. For nitric acid agitation leaching, the optimal performance was achieved using 80 mesh ore in 4 mol L^−1 nitric …
DOI: 10.1016/0304-386X(84)90032-X Corpus ID: 96245629; Radium in uranium mill tailings - Some observations on retention and removal @article{Nirdosh1984RadiumIU, title={Radium in uranium mill tailings - Some observations on retention and removal}, author={Inderjit Nirdosh and S. V. Muthuswami and Malcolm H. I. Baird}, …
Uranium reserve estimates in ore deposits can be significantly impacted by 226 Ra/ 238 U disequilibria arising from the differential mobility of uranium and radium during groundwater transport. 1D reactive transport models were developed to investigate the long-term effects of retention processes (UO 2(am) precipitation, U(VI) and Ra …
URANIUM MINING METHODS. Based on the current understanding of uranium deposits in the Commonwealth of ia, extraction of uranium ore would use open-pit mining, or underground mining, or a combination of both ().These general terms incorporate a large variety of design possibilities—there are as many methods of mining uranium as there …
A process is presented for extracting uranium and radium values from a uranium ore which comprises leaching the ore with a ferric chloride solution at an elevated temperature of above 50 deg C and at a pH less than 4; separating the ore residue from the leaching solution by filtration; precipitating the excess ferric iron present at a pH of less than 5 by …
uranium ore and mill tailings to remove radium. performed to obtain data on the r ry of radium, thorium, and ch liquors and on the recycle of leaching agents. A few scou hydrochl or? G aci d, ethyl en c acid (EDTA), tri ami nepentaaceti c acid ( sample of a western U.S. ore and tw les of tailings ined from different uranium mills th
Uranium Ore (Carnotite). Milling: This process takes place at a mill after the ore containing uranium is removed from the Earth through open pit or underground mining.The ore is brought to a mill, crushed, and ground up before chemicals are added to dissolve the uranium. The uranium is then separated from the chemical solution, …
To improve the utilisation of uranium resources while reducing the radioactive contamination of uranium slag by 226 Ra, the effects of various factors on uranium–radium co-leaching from uranium ore were investigated. For nitric acid agitation leaching, the optimal performance was achieved using 80 mesh ore in 4 mol L −1 nitric …