· 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. ... Unfortunately, due to the considerable pre-oxidation of the ore, uranium concentrations at the ...

When leaching with carbonate solutions without an additional oxidizing agent, the extraction of uranium from the Sugraly deposit ore sample was 52 and 59 % (sodium carbonate and ammonium carbonate). The use of hydrogen peroxide as an oxidizing agent made it possible to achieve 87-88 % extraction into pregnant solutions in 21 days without pre-oxidation.

 · The maximum percentage uranium leaching of 96 % is achieved after 15 min of contact time leaching using 3.0 M hydrochloric acid and 4/ 1 liquid/ solid mass ratio at 26 °C with 400 rpm mechanical stirring speed. The experimental data are well interpreted with a shrinking core model with diffusion control through a porous product layer.

 · The uranium extraction rate will be higher, initially. However, after sufficient time, the overall uranium recovery will be similar to the phase 4 case. Mechanism of Thorium Leaching. Agnew lake ore contains about …

In order to improve leaching rate of U and its associated element Sc in process of U leaching, effects of H2SO4 concentrations, L/S, and temperatures on leaching rate of U and Sc were investigated. Applying alkaline residue sample from a sandstone-type uranium ore after alkaline column leaching as the study object to establish leaching kinetic model …

 · The central composite design (CCD) of experiments was used to study the leaching of uranium and iron from the mineralized Gabal Al-Aglab uranium ore sample using sulfuric acid solution. The leaching… Expand 2 Uranium-series disequilibrium as a tool for tracing uranium accumulation zone in altered granite rocks Mahmoud R. Khattab, A. …

The experiment with mixed culture and added ferrous reached the highest uranium recovery rate (72.04%), which exceeded the recovery rate of traditional acid leaching technique 12%. High uranium recovery was founded to be due to the addition ferrous iron that can be readily achieved by fluoride-tolerance bacterial leaching.

 · Since uranium ores containing > 15% carbonates cannot be subjected to acid leaching (Merrit, 1970), the Tummalapalle ore (containing 83% carbonates by wt.) was …

 · In some cases, uranium is extracted from low-grade ore by heap leaching. This may be done if the uranium contents is too low for the ore to be economically processed …

 · Semantic Scholar extracted view of "Understanding sulphuric acid leaching of uranium from ore by means of 234U/238U activity ratio as an indicator" by B. Satybaldiyev et al.

uranium ore leaching：…,uranium ore leaching 、、。 English ...

 · Uranium Recovery (Extraction) Methods. Uranium recovery involves one of the following extraction processes. In a conventional uranium mine and mill, uranium ore is extracted from the Earth, typically through deep underground shafts or shallow open pits. The ore is transported to a mill, where it is crushed and undergoes a chemical process to ...

The major part of the extractable uranium is associated with a readily acid-soluble fraction in both ore and tailings. The major part of the extractable 226Ra was associated with an iron, manganese hydrous-oxide fraction in the ore and tailings. Thorium-230 was the least leachable of the radionuclides studied. The major portion of the extractable 230Th was …

 · Crushing Uranium Ore. Depending upon ore shipment schedules, it is desirable to operate the crushing and sampling sections on a 7½ hour per day basis. ... Most ores also require the addition of an …

The U.S. Department of Energy's Office of Scientific and Technical Information

 · Lyometallurgical Tests on Marysvale Uranium Ores. November 1950. F. W. Jr. Bloecher. Lyometallurgical leach tests have bean run on samples of uranium ore from Marysvale, Utah. Uranium extractions ...

Uranium leaching is a typical liquid-solid reaction. If the uranium particles are regarded as spherical particles, the kinetics of leaching in uranium ore can be described by the shrinking core model (SCM), and the uranium extraction may be limited by the following steps: surface chemical reactions controlled kinetic model (Eq.

 · Uranium hydrometallurgy fixed bed is used to separate and extracting uranium compounds from the leaching of uranium ore. It is a very important equipment in the process of uranium purification. The distribution of the internal flow field of uranium hydrometallurgy fixed bed has great effect on the running efficiency of fixed bed.

Heap leaching is also used at some mines to recover uranium from lower grade ores. In this procedure, acid solutions are allowed to percolate through a mound of crushed ore. The …

First used in Wyoming in the 1950s, in-situ leaching (ISL) mining accounts for most uranium production in the United States. In situ leaching – what it is. ISL involves injecting chemicals, called "lixivants" into an aquifer that …

 · Suitable processing conditions were: leaching at 35-40 degree C, pH 1. 5-2. 0 and redox potential -475 mV for periods of 16-24 h with ore ground to 50 per cent -200 mesh.

 · applicable to alkaline leaching of primary uranium ores. 7. Various ore transport and stacking systems are used, depending on the ore particle size, the shape of the leach pad area, the site topography, the ore treatment rate, and whether permanent or on-off pads are used. Heap Leaching & its Application to Copper, Gold, Uranium & Nickel Ores 7 ...

 · capable of producing up to about 175 short tons of uranium oxide per year. Davidite ore was mined at Radium Hill and pre-concentrated at the mine site by heavy medium separation and flotation. The resulting concentrates were then railed to the treatment plant at Port Pirie. Due to the refractory nature of the ore mineral, leaching had …