Bioleaching of low-grade volcanogenic uranium deposits at …

Uranium is an important strategic resource, which is mainly extracted from uranium ore. Acid leaching is the most commonly used uranium extraction technique, with sulfuric acid used as the leaching agent and MnO 2 or NaClO 3 used as the oxidants [].As the hard rock type high-grade uranium resources in southern China is gradually decreasing and the mining depth …

Uranium in South Africa: Exploration and Supply …

the north-western part of South Africa. Uranium has been produced in South Africa since 1952. ... alkaline leaching will be used for processing of ore, and production may start in 2018 (Peninsula ...

ALTA Uranium 2011 Proceedings

Leaching of Uranium Minerals: Challenges and Research Opportunities Prof. Suresh K. Bhargava, Associate Pro Vice-Chancellor (International) - College of ... University of the Witwatersrand, South Africa 43 Uranium Project Development – Adopting the Right Approach Alan Taylor, ALTA Metallurgical Services, Australia 56 SX/IX/Refining

A mineralogical perspective on the recovery of uranium …

"Mineralogy and uranium leaching response of low-grade South African ores" . Minerals Engineering, 21, 16–22. ... "Mineralogy and geochemistry of phosphate minerals and brannerite from the Proterozoic carbon leader reef gold and uranium deposit, Witwatersrand, South Africa" . In: Monograph Series on Mineral Deposits, 27, 129–142.

Notes of Practical Ion Exchange in Uranium Extractive …

2. Sorption of uranium is carried out directly from the pulp, defined as 'resin-in-pulp' (RIP). Uranium pulp can be supplied as by-product of other metals recovery like gold (in South Africa) or copper. For some types of ores, leaching of uranium from milled ore can be

Water–Rock reactions in the acid leaching of Uranium: …

Lottering et al. (2008) evaluated the uranium leaching response of low–grade ores in South Africa via uranium leaching tests. More specifically, they used residue analysis to determine that quartz, muscovite, pyrophyllite and albite are non–acid consumers, whereas chlorite is a critical acid consumer.

(PDF) Mineralogy and uranium leaching response of low …

In this paper, a mineralogy-leachability explanation is presented to rationalise the difficulty in exceeding 90% dissolution from low grade uranium ores in the Vaal River region (averaging …

OneMine | The Development of a Diagnostic Leaching Method for South

Gold deposits in South Africa are invariably associated with uranium bearing minerals. Although it is low grade uranium by international standards, averaging around 0.3 kg U3O8 per ton of ore, recovery of uranium as a by-product improves the overall economics of gold extraction. Moreover, the current high uranium prices as well as increased demand due to …

A Review of Uranium Deposits in the Karoo Supergroup …

1Council for Geoscience, Bellville, South Africa (mailto:[email protected]) Abstract Uranium is present in the form of fluvially-deposited, sandstone-hosted peneconcordant tabular deposits in the Late Permian lower ... leaching and mobilisation of uranium from the above sources. Uranium-bearing solutions moved through the sand bodies with

Nuclear Energy Agency (NEA)

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ALTA 2019 Uranium-REE Proceedings

Topics include treatment of nickel laterites, copper ore leaching, uranium ore processing, copper SX-EW, heap leaching and solvent extraction. ALTA 2020 is a world-class annual …

A mineralogical perspective on the recovery of uranium …

Baseline laboratory leach tests, which replicated plant leach conditions of 30 kg/ton acid, 4 kg/t oxidant, 24 hour residence time and 60°C leach temperature, yielded elevated dissolutions between ~77% and ~96%, with a combined overall uranium recovery of ~94%.

Uranium from Africa – An overview on past and current …

This is particularly true for South Africa where uranium has been brought to surface for nearly 130 years by deep level gold mines. 28 According to WISE Uranium, South Africa currently hosts some 700 Mt of U mill tailings, accounting for …

Uranium Mining in South Africa

Uranium ore is generally processed through grinding the ore materials to a uniform particle size, which is then treated through chemical leaching to extract the uranium. This results in a dry powder form of the natural uranium …

Improving uranium recovery by utilising compressor …

Leaching is the key process used for uranium extraction in a slurry mixture. Heat is often introduced in the leaching process to increase the uranium extraction yield.

The development of continuous fluidized bed ion …

The unit processes for the recovery of uranium that have been applied in South Africa by way of the acid-leaching route are well known, and comprise leaching, solid-liquid separation, concentration and purification of the metal, and precipitation of the product. In the development of these unit operations, the areas that have

A mineralogical perspective on the recovery of uranium …

that leaching uranium before gold improves liberation of gold from enclosing gangue, thereby improving recovery (Ford, 1993; Lottering et al., 2008; Pienaar et al., 2015).

Uranium extraction: the key process J drivers

The uranium industry has experienced over two decades of inactivity with the closure of virtually all the smaller operations in North America, South Africa and Europe. During this period production has been sustained by a small group of companies that have dominated supply. More recently, the Beverley project in Australia and the Langer ...

A Review of Uranium Deposits in the Karoo Supergroup of South Africa …

Introduction Two types of uranium deposits are present in strata of the Karoo Supergroup in South Africa. These are: (1) fluvially-deposited, sandstone-hosted, peneconcordant, tabular deposits in the Late Permian lower Beaufort Group (Adelaide Subgroup) and Late Triassic Molteno and Elliot Formations within the main Karoo Basin, and (2) coal …

Thesis- Modelling of uranium leaching kinetics

i Modelling of uranium leach kinetics Bernard Liswani Sililo Supervisor: Dr. Dick Groot Department: Materials Science and Metallurgical Engineering Faculty: Engineering, Built Environment and Information Technology Degree: Masters in Applied Science: Metallurgy ABSTRACT The uranium price decline has negatively impacted on the uranium mining industry.

South African Uranium Project Shows High Recovery Rates

The Muntanga and Dibbwi East projects in South Africa – operated by Canadian mining firm GoviEx Uranium – have demonstrated uranium recoveries of 90% or higher. A metallurgical test work program conducted by GoviEx Uranium on the mine confirmed the efficiency of the heap leach process, underscoring the potential of the deposits.

Uranium in South Africa

Uranium in South Africa * by M.A. Fordt SYNOPSIS This paper reviews the history, sources, mineralogy, extraction metallurgy, conversion, and enrichment of uranium in South Africa. Over the past 40 years extraction plants were bui!t at 27 sites, an9.over 140 .kt of uranium have been produced. Older plants have had to adapt to changing market ...

(PDF) Uranium in Africa

There are four major types of deposits that produce the majority of the uranium in Africa: The Archaean quartz-conglomerate hosted golduranium deposits of South Africa; the Neoproterozoic end ...

(PDF) A mineralogical perspective on the recovery of uranium …

A mineralogical perspective on the recovery of uranium from brannerite-rich ore at Cooke Section, West Rand Goldfield, South Africa November 2020 South African Journal of Geology 123(4):615–632

Kinetics Leaching Study of Uranium from Algerian

"Kinetics Leaching Study of Uranium from Algerian Phosphate by Sulfuric Acid" 352 A. Mellah2, ETJ Volume 3 Issue 01 January 2018 The presence of H 3 O + ions from the dissolved H 2 SO 4 in the ...

Re-Processing Gold Tailings in South Africa

to leach uranium and generate acid. The autoclave discharge is combined with the cleaner scavenger tails, and the acid and ferric ions generated in the autoclave are used to leach more uranium and oxidize more sulphide in the cleaner tails. The product from the concentrate leach circuit is processed by resin in pulp for uranium recovery ...

URANIUM IN AFRICA: Current Situation, Prospects

Promoting the Namibian Uranium Brand NAMIBIA Namibia has significant uranium mines capable of providing 10% of world mining output Its first commercial uranium mine began operating in 1976 Deposit Type Resources Measured & Indicated Inferred Rössing Alaskite 239 926 tU in 0.02% ore 26 154 tU in 0.02% ore Husab Alaskite 143 740 tU in 0.048% ore 40 130 …

gold heap leaching south africa and indonesia

Sprinkler irrigation in mining applications is mainly used for heap leaching of cooper, gold, uranium and nickel. Sprinklers are ideal for slope irrigation, evaporation, dust control, reforestation and can also be installed to complete the leach cycle or provide a final rinse. ... leaching south africa and indonesia cil blower for leaching in ...

URANIUM RECOVERY FROM ACID LEACH LIQUORS: …

The leach liquor composition is, intrinsically, one of the main factors affecting process selection, with the uranium tenor playing a key role. IX might be favoured over SX when large volumes of leach liquors with low uranium concentrations are to be treated, because solvent losses are primarily related to the volume of solution handled (2).

Acidic heap leaching behavior of uranium from El-Sela area, South …

The percolation technique was used to examine the leachability of uranium from El-Sela uranium mineralization. The agglomeration effect, particle size, flow rates, free acidity, solid/liquid ratio, and the ratio of cobblestone effect were all studied in the kinetics of uranium leaching. At a height of 3.0 m within the column, the optimal ratio of cobblestone to ore was …

A mineralogical perspective on the recovery of uranium …

Department of Geology, University of Johannesburg, P.O. Box 524, Auckland Park, 2006, South Africa. e-mail: [email protected]; [email protected]; [email protected]; [email protected ... The present study thus demonstrates the value of a geometallurgical approach in enhancing the understanding of uranium recovery through acid leaching.

A Review of Uranium Deposits in the Karoo Supergroup of …

Map of South Africa showing distribution of Karoo basins, uranium provinces and major lithostratigraphic units in the main Karoo Basin. Introduction Two types of uranium …

Uranium in SouthAfrica

Leaching andFiltration12 Thefirstleaching experiments weredoneattheGML in 1946,whenahigh-grade flotation concentrate wasleached withchlorine. Almost complete dissolution ofthegoldand uranium was obtained, but itwas later found that concentrates ofagrade thatwould justify leaching with chlorine would berare. Attention wasthen diverted to

RECOVERY OF URANIUM FROM URANIUM RESIDUE …

University of Pretoria viii Figure 5-7: Particle size (µm) distribution obtained for stripping product, using UO2 as seed..... 56 Figure 5-8: Particle size (µm) distribution obtained for stripping product, using triton X 100 as

Mineralogy and uranium leaching response of low grade South African ores

In situ leaching: A chemical solution is pumped into an underground aquifer, dissolving uranium-bearing minerals to be pumped back to the surface. ... South Africa has 2 nuclear reactors and is ...

Nuclear fuel cycle' Extractingg uranium from its ores

grade uranium compounds. Acid leaching- Uranium ores vary significantly from deposit to deposit and each mill must be designed to fit the specific characteristics of its ore. The general process, however, is similar for many ores, variations of the acid-leach flowsheet shown in Figure 1 have been used in more than 20 nulls. The basic steps in this

The evaluation of various oxidants used in acid leaching …

In acid leaching of uranium the uranium is oxidized by ferric iron, which in turn is reduced to ferrous iron. The reduced iron needs to be oxidized to the ferric form to allow the uranium …

35 No. 9 Uranium Extraction Technology

INDONESIA IRAN, ISLAMIC REPUBLIC OF IRAQ IRELAND ISRAEL ITALY JAMAICA JAPAN JORDAN ... SOUTH AFRICA SPAIN SRI LANKA SUDAN SWEDEN SWITZERLAND SYRIAN ARAB REPUBLIC THAILAND TUNISIA TURKEY ... Leaching. 3. Solution mining. 4. Uranium mines and mining. I. International Atomic Energy Agency. II. Series: Technical reports series …

Uranium processing

Uranium processing - Leaching, Extraction, Purification: Roasted uranium ores are leached of their uranium values by both acidic and alkaline aqueous solutions. For the successful operation of all leaching systems, uranium must either be initially present in the more stable hexavalent state or be oxidized to that state in the leaching process. Acid leaching is …

Forsys Reports Results from Preliminary Leaching Test

Figure 1: Leaching Columns at SGS South Africa The current testwork programme has yielded the following observations and inferences: • Enhanced leach kinetics were noted in the latter part of the programme, attributed to the acid curing procedure conducted prior to sample introduction into the columns.