uranium leaching

Sequential Bioleaching of Phosphorus and Uranium

The objective of this research was to study sequential (bio)leaching of uranium and phosphorus from apatite ores. By utilizing a selective uranium pre-leaching step and producing uranium leachate prior to the phosphoric acid step, new process routes may be introduced.

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Uranium dumpsite south of Durango leaching into groundwater

Aug 28, 2019· Uranium dumpsite south of Durango leaching into groundwater. Well #0618 has shown spikes of uranium levels since 2007. The line in red is considered the site-specific standard.

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US4258955A - Process for in-situ leaching of uranium ...

Process for the in-situ leaching of uranium from a subterranean ore deposit employing a lixiviant containing a carbonate leaching agent and an oxidizing agent. The lixiviant is heated to a temperature of at least 110° F. prior to injection into the subterranean ore deposit. The use of a heated lixiviant provides for a substantially greater ultimate uranium recovery than that attained through ...

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Uranium - DuPont

Worldwide, acid leaching with sulfuric acid is the most common method of extracting uranium from ores, with alkaline leaching being practiced primarily in the United States. However, based on available ores, alkaline leaching is becoming more common because of its lesser environmental impact.

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TENORM: Copper Mining and Production Wastes | Radiation ...

Leaching. There are two main leaching methods: heap leaching and in-situ leaching. Heap leaching is the most common method used in the U.S. When processing copper through heap leaching, vast quantities of ore and overburden overburdenSoil and rocks that have been moved out of the way to get to ore are called "overburden." In areas where there ...

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Uranium Bioleaching - MINTEK | MINTEK

Uranium Bioleaching. In recent years, there has been an upsurge in uranium exploration across the globe, driven by a renewed interest in nuclear energy and higher uranium prices. In South Africa, uranium was produced as a by-product of gold production in the Witwatersrand Basin, but after the collapse of the uranium market in the 1980s, the ...

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Uranium PRICE Today | Uranium Spot Price Chart | Live ...

Mining processes include in-situ leaching, open-pit, and underground mining. One pound of uranium is capable of producing as much energy as three million pounds of coal through fission. Energy

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Carbonate Leaching of Uranium from Contaminated Soils ...

Uranium (U) was successfully removed from contaminated soils from the Fernald Environmental Management Project (FEMP) site near Fernald, Ohio. The laboratory column leach process, referred to as the simulated heap leach process, using 0.5 M sodium bicarbonate as the dominant reagent, was able to achieve uranium removals of 75−90%, corresponding approximately to the percentage of uranium …

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Radioactive Waste From Uranium Mining and Milling ...

In situ leaching: “In situ” is Latin for “in place.” In situ leaching is the process of pumping chemicals into groundwater to dissolve uranium in porous rocks. When uranium is located in an area saturated by groundwater, then in situ leaching may be used …

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Bioleaching - Wikipedia

Bioleaching is the extraction of metals from their ores through the use of living organisms.This is much cleaner than the traditional heap leaching using cyanide. Bioleaching is one of several applications within biohydrometallurgy and several methods are used to recover copper, zinc, lead, arsenic, antimony, nickel, molybdenum, gold, silver, and cobalt

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(PDF) URANIUM MINING BY IN-SITU LEACHING | Sai Charan ...

URANIUM MINING BY IN-SITU LEACHING

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In-Situ Leach Mining of Uranium

Apr 19, 2017· While both these techniques produce uranium in different ways, the most common and direct way of mining uranium is known as in-situ leach (ISL) mining. ISL was first tried on an experimental basis in Wyoming during the early 1960's. Stemming from this, the first commercial in-situ leaching mine began operating in 1974.

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Uranium Acid Leaching - Metallurgist & Mineral Processing ...

In situ microbial leaching is greater acceptance since it eliminates the expense of moving vast amounts of material. For instance thousand tons of uranium ore must be handled in other than bioleaching processes, to obtain one ton of uranium. This is an indirect leaching process since the microbial attack is not on uranium ore directly but on ...

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Uranium leaching using citric acid and oxalic acid ...

Citric acid and oxalic acid, the main metabolites of fungi, have different leaching effects on uranium ore. Herein, uranium leaching from a volcano-litho-type uranium ore using citric acid and oxalic acid was studied by performing soaking experiments in incubator shakers using pure water and H2SO4 as controls. The citric acid is advantageous over oxalic acid in terms of the uranium leaching ...

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IN SITU LEACHING OF URANIUM - IAEA Scientific and ...

in situ leaching of uranium: technical, environmental and economic aspects proceedings of a technical committee meeting organized by the international atomic energy agency and held in vienna, 3-6 november 1987 a technical document issued by the international atomic energy agency, vienna, 1989.

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Uranium processing | Britannica

Uranium processing, preparation of the ore for use in various products. Uranium (U), although very dense (19.1 grams per cubic centimetre), is a relatively weak, nonrefractory metal. Indeed, the metallic properties of uranium appear to be intermediate between those of silver and other true metals

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Bioleaching of low-grade uranium ore using ...

Mar 09, 2010· Bioleaching of uranium was carried out with Turamdih ore sample procured from Uranium Corporation of India Limited, Jaduguda. The bacterial strain that was used in the leaching experiments was isolated from the Jaduguda mine water sample. Efficiency of ...

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Continued Multicolumns Bioleaching for Low Grade Uranium ...

The continued multicolumns bioleaching is seen to be very effective for leaching uranium. After 120 d of continued multicolumns bioleaching, the acid consumption of the last column was 33.6 g/kg, which is much less than that of acid leaching. The uranium recovery is highly leached (89.5%).

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Uranium Mining and Extraction from Ore

Acid leaching has been used in the uranium milling industry since the mid-forties and has accounted for a majority of the production since that time. It is preferred over carbonate leaching because of its greater efficiency in recovering uranium. Consequently much research has been done on the factors which influence the kinetics of the oxidation of uranium, as well as those which influence ...

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Manual of Acid in Situ Leach Uranium Mining Technology | IAEA

In situ leach (ISL) technology is an innovative and recently utilised mining alternative. It is recognized as having economic and environmental advantages when properly employed by knowledgeable specialists to extract uranium from suitable sandstone type deposits. This report brings together ...

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WATER AND CARBONATE BALANCES IN AN ALKALINE …

WATER AND CARBONATE BALANCES IN AN ALKALINE URANIUM EXTRACTION CIRCUIT by Mike Dry Arithmetek Inc. Ontario, Canada [email protected] ABSTRACT This paper presents the results of an exercise in which a generic alkaline circuit for uranium extraction was examined. The water and carbonate balances were analyzed, the objective being

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HYDROGEN PEROXIDE LEACHING OF URANIUM IN CARBONATE ...

Problems associated with the in-situ leaching of uranium are considered. Specifically, the kinetics of UO//2 dissolution in ammoniacal carbonate solutions were investigated with hydrogen peroxide as an oxidant. Also, the effects of hydrogen peroxide concentration, total …

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(PDF) ANALYSIS OF URANIUM LEACHING PROCESS AND EFFECT …

analysis of uranium leaching process and effect of cake washing on uranium recovery Article (PDF Available) · November 2014 with 912 Reads How we measure 'reads'

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Impacts of Uranium In-Situ Leaching

In the case of in-situ leaching (ISL) - also called in-situ recovery (ISR), or solution mining - the uranium-bearing ore is not removed from its geological deposit, but a leaching liquid is injected through wells into the ore deposit, and the uranium-bearing liquid is pumped to the surface from other wells. In-situ leaching gains importance for the exploitation of low grade ore deposits, for ...

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Uranium Heap Leaching

Dec 06, 2013· During leaching, the piles present a hazard because of release of dust, radon gas and leaching liquid. After completion of the leaching process, a longterm problem may result from naturally induced leaching, if the ore contains the mineral pyrite (FeS 2), as with the uranium deposits in Thuringia, Germany, for example). Then, acces of water and ...

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The leaching of uranium from betafite - Murdoch University ...

Betafite is a uranium–titanium–tantalum–niobium complex oxide mineral generally described as (Ca,U)2 (Ti,Nb,Ta)2 O6 (OH). Significantly lower uranium extractions have been observed when betafite containing ores has been treated via conventional process flow sheets. Therefore it is necessary to understand the leaching behaviour of this mineral in order to open the potential for it to ...

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URANIUM LEACHING AND RECOVERY PROCESS(Patent) | DOE …

A process is described for recovering uranium from carbonate leach solutions by precipitating uranium as a mixed oxidation state compound. Uranium is recovered by adding a quadrivalent uranium carbon;te solution to the carbonate solution, adjusting the pH to 13 or greater, and precipitating the ...

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4 Uranium Mining, Processing, and Reclamation | Uranium ...

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 are orebody sizes, shapes, and mineral constituents.

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Uranium Mining - Wyoming

In-situ recovery or ISR (also referred to as ISL or in-situ leach) is more economical and is considered to have a lower environmental impact than conventional mining. It is the preferred method of uranium mining if the uranium occurs in a shallow deposit hosted in water-saturated porous and permeable sedimentary rocks.

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The leaching of uranium from betafite - ScienceDirect

Leaching studies were also conducted on recrystallised betafite to determine how the crystallinity would affect the dissolution of uranium at varied leaching temperature, initial acid concentration and initial iron concentration under the same conditions reported above for the natural betafite sample.

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NRC: Uranium Recovery (Extraction) Methods

Mar 29, 2018· The uranium is concentrated to produce a material called "yellowcake" because of its yellowish color. Alternatively, uranium may be recovered from the ore using a heap leach process. In the heap leach process, the ore is placed on a engineered barrier and sprayed with acid.

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Uranium Leaching from Contaminated Soil Utilizing ...

Biosurfactants have recently gained attention as “green” agents that can be used to enhance the remediation of heavy metals and some organic matter in contaminated soils. The overall objective of this paper was to investigate rhamnolipid, a microbial produced biosurfactant, and its ability to leach uranium present in contaminated soil from an abandoned mine site.

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35 No. 9 Uranium Extraction Technology

TECHNICAL REPORTS SERIES35 No. 9 Uranium Extraction Technology %ffij INTERNATIONAL ATOMIC ENERGY AGENCY, VIENNA, 1993 . The cover picture shows the in situ uranium central processing facility, Hobson ... Leaching. 3. Solution mining. 4. Uranium mines and mining. I. International Atomic Energy Agency. II. Series: Technical reports series ...

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(PDF) Application of cavitation in uranium leaching

Application of cavitation in uranium leaching Article (PDF Available) in Desalination and water treatment 52(1-3) · January 2014 with 293 Reads How we measure 'reads'

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Microbial Leaching of Uranium Ore - IntechOpen

uranium heap leaching process on a commercial scale. This is an early turning point in the microbiological leaching of uranium ores. Harrison et al. (1966) reported the role of th e iron oxidizing Acidithiobacillus ferrooxidans in leaching of uranium. The uranium ore was st acked in heaps, similar to dump leaching of

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In Situ Leach Mining (ISL) of Uranium - World Nuclear ...

In situ leaching (ISL), solution mining, or in situ recovery (ISR) involves dissolving uranium in the ground and pumping the solution to the surface where the minerals can be recovered. Information from the World Nuclear Association, the global private-sector organization that provides information on nuclear power, nuclear energy, and the role of nuclear in sustainable development.

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