Leaching kinetics of uranium from a quartz–chlorite–biotite rich …

Kinetics studies shows the biological leaching of the uranium ore pretreated by microwave is jointly controlled by chemical reaction and diffusion, but mainly controlled by chemical reaction with ...

Geobiology of In Situ Uranium Leaching

Uranium is currently mined via open pit and underground mining as well as with in situ leaching methods, with in situ leaching currently accounting for approximately 45 % of total uranium production.

Bio Hydrometallurgical Technology, Application and Process …

Many studies indicate microbial leaching is more important in low-grade ore, ore sample collected from Mianhuakeng uranium mine located in northern Guangdong province in …

Electrokinetic in situ leaching of U from low-permeability …

Uranium (U) is a crucial mineral resource that serves as the foundation of nuclear industry development and plays an indispensable role for nuclear power generation and …

Bioleaching of uranium from low-grade uranium ore with a …

Extraction and Recovery of Cerium from Rare Earth Ore by

Rare earth elements are widely found in many minerals, some of which, such as bastnaesite, monazite, and xenotime, are of great commercial value. Cerium (Ce) is the rare earth element with the highest content in light rare earth ore. Solvent extraction is the most effective and efficient method to recover and separate Ce from other light rare earth elements. After …

Chapter 4 Grade Ores

leaching solution used. In the next step, the post-leaching solution was treated by the sol-vent extraction or ion exchange chromatography to separate uranium from other metals present in the ore. The novel routes of leaching by using membrane methods were exam-

Stanislaw Wolkowicz

Uranium was leached from the ground uranium ores with efficiencies in 81– range that depend on the type of ore and leaching solution used. In the next step, the post-leaching solution was treated by the solvent extraction or ion exchange chromatography to separate uranium from other metals present in the ore.

Uranium in Poland: Resources and Recovery from Low …

ore mineralogy and mineral liberation on the leaching behavior of uranium and other metals more readily leachable in comparison with the dictyonema shales. In the leaching by acid, all

Study on the optimal neutral leaching on a high carbonate …

Optimization of process parameters are key factors for leaching unramium ore, particularly, some high carbonate sandstone-type uranium ore with neutral leaching (CO2 + O2) method. In our study, batch leaching of uranium ore from Chaixinan region Qaidam Basin China were conducted under various NH4HCO3 concentrations, CO2:O2, gas pressure, and …

Leaching behavior of uranium and vanadium using strong …

The present scientific study focused on leaching behavior of uranium and vanadium from Korean domestic ore. The leaching process experimental conditions optimized for uranium and vanadium metals recovery from Korean domestic ore and developed the basic experimental procedures such as time, particle size, acid influence, temperature effect and …

(PDF) Microbial Leaching of Uranium Ore

The ore initially contained from 0.15 to 0.20% of uranium in the form of uraninite, but ore samples used in the study contained about 0.05% of uranium, as it was exhausted during acid leaching ...

Microbial Leaching of Uranium Ore

Microbial Leaching of Uranium Ore Hadi Hamidian Islamic Azad University, Qaemshahr Branch Iran 1. Introduction This chapter is a review of the microbiological leaching of uranium ores. Microbiological

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 …

MANUAL FOR URANIUM ORE PROCESSING

The ore is crushed and ground to a suitable range of particle sizes required for effective leaching and to produce a material that can be slurried and pumped through the processing circuits. (b) Leaching Uranium is leached (dissolved) from the ground ore using either acid or alka-

Column leaching of uranium ore with fungal metabolic …

Abstract To verifying the feasibility of uranium recovery with fungal metabolic products in large-scale applications, column leaching and ion exchange of uranium was carried out. The uranium recovery reached 81.76 % in 14 days. The ion exchange curve for the leach solution obtained with the metabolic products of Aspergillus niger was in the shape of a wave. …

The effect of surfactants on the efficiency and consumption …

For the leaching process of uranium ore, the leaching rate, leaching efficiency, and energy consumption are hot research topics. In order to meet the industry's demand for natural uranium and ensure the stable supply of uranium products, this article proposes the use of surfactants to improve the leaching efficiency and leaching rate of uranium ore, thereby …

Laws Governing the Biochemical Heap Leaching of Low …

Uranium ore from a deposit in China was used for biochemical leaching. The ore is a stubborn ore characterized by a low degree of oxidation. It is a natural "primary" ore with a …

Enhancement of leaching efficiency of low-grade uranium ore

The promising trends in improvement of geotechnical methods of low-grade and noncommercial mineral production are discussed. The results of the chemical, material and granulometric analyses of uranium-containing aluminosilicate ore are presented. In the selected technological samples, the content of uranium was determined as function of the size with a view to setting …

Mining and Beneficiation of Phosphate Ore | IntechOpen

The first commercial production of phosphate rock began in England in 1847. A wide variety of techniques and equipment is used to mine and process phosphate rocks in order to beneficiate low-grade ores and remove impurities. The eighth chapter of this book deals with mining and beneficiation of phosphate ore. The principle and operating conditions of …

Recovery of Uranium from Alkaline Ore Leach Solution …

An extractive spectrophotometric analytical method has been developed for the determination of uranium in ore leach solution. This technique is based on the selective extraction of uranium from multielement system using a synergistic mixture of 2-ethylhexyl phosphonic acid-mono-2-ethylhexyl ester (PC88A) and tri-n-octyl phosphine oxide (TOPO) in cyclohexane and color …

In-situ Leaching

Nuclear Fuel Cycle. Source: Nuclear Regulatory Commission from the US. License: CC BY 2.0. Uranium mining and milling is the starting process for all nuclear fuel cycles.In this process, uranium ore is extracted from the Earth's crust, similarly to mining copper, zinc, and other metals. Uranium is often found with copper, phosphates, and other minerals; thus, it is often a co …

Enhancement of the Leaching Rate of Uranium in the …

In the present work, experiments have been performed for leaching (recovery) of uranium from MgF2 (byproduct from the uranium ore recovery process) under various conditions of leach acid concentration with and without the presence of ultrasound, under different energy dissipation rates (different rotational speeds of conventional stirring by impeller), and on …

Petrology, mineralogy, and ore leaching of sandstone-hosted uranium …

DOI: 10.1016/J.OREGEOREV.2020.103768 Corpus ID: 224874896; Petrology, mineralogy, and ore leaching of sandstone-hosted uranium deposits in the Ordos Basin, North China @article{Xuebin2020PetrologyMA, title={Petrology, mineralogy, and ore leaching of sandstone-hosted uranium deposits in the Ordos Basin, North China}, author={Su Xuebin and …

Study on precipitation and plugging mechanism in CO2

Due to the constant circulation of leaching agent injection and leaching solution extraction during the in-situ uranium leaching process, the salinity in the leaching solution keeps rising, which causes the blockage of the ore-bearing layer [], one of the major global concerns.[1, 2].Plugging of ore-bearing strata greatly limits the production efficiency of in-situ leaching of …

3,350 108,000 1.7 M

ores. The signiicant resources of uranium are also in unconventional raw materials, e.g. phos-phates, nonferrous metal ores, carbonates, monazite sands, black shales, hard coal and brown

Pressure Acid Leaching of A Refractory Uranium Ore

By conventional agitation leaching to deal with a refractory uranium ore,the acid consumption is high,and the leaching solution is treated difficulty.By pressure acid leaching,the acid consumption can decrease by 30%and the concentration range of residual acid in the leaching solution is of 2-4g/L and suitable for the next treatment.

A Review of In Situ Leaching (ISL) for Uranium Mining

Uranium, a cornerstone for nuclear energy, facilitates a clean and efficient energy conversion. In the era of global clean energy initiatives, uranium resources have emerged as a vital component for achieving sustainability and clean power. To fulfill the escalating demand for clean energy, continual advancements in uranium mining technologies are imperative. …

Optimisation of uranium–radium co-leaching from …

The acid leaching of uranium ore samples with dierent particle sizes was investigated while all other conditions remained unchanged. The eects of ore particle size on the leaching rates of uranium and radium are shown in Table 2. The leaching rates of both uranium and 226Ra increased as the particle size of the ore decreased (Table 2).

Uranium in Poland: Resources and Recovery from Low-Grade …

The presented studies deal with an assessment of the possibility of uranium recovery from the low-grade uranium resources in Poland. Uranium was leached from the …