Uranium recovery from sandstone-type uranium deposit by acid in-situ leaching - an example from the Kujieertai

Zhou, Yipeng; Li, Chang-Jiu; Xu, Lijin; Liu, Jinhui; Sun, Zhifu; Shi, Weijun

doi:10.1016/j.hydromet.2019.105209

Cited by 42 publications

(18 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The formation of ettringite, occurring at a sulfate concentration of 12.5 mmol/L with respect to portlandite, takes about five minutes to be first observed. (16) It is believed that the deceleration occurs due to the impermeable nature of ettringite crystals which form on the tricalcium aluminate surface, retarding further hydration, until the sulfate concentration depletes [71].…”

Section: In the Presence Of Sulfatesmentioning

confidence: 99%

“…This pre-treatment opens the rock, creating microfractures, which leads to the efficient extrusion of natural resources as the exposed area would be large. In-situ leaching can be done for metal recovery, where a lixiviant can be circulated through the created channels, allowing the dissolution of the metal and transportation of the liquid back to the surface for further treatment [15,16]. Similarly, SREMA can also be adopted for hydrocarbon recovery [17] and geothermal energy extraction [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Hydration and Volume Expansion Mechanisms of Modified Expansive Cements for Sustainable In-Situ Rock Fragmentation: A Review

Liyanage

Ranjith

2021

Energies

View full text Add to dashboard Cite

This review provides the hydration and volume expansion mechanism of expansive materials, with the goal of utilizing them in the development of sustainable mining methods. The main focus of the review will be the newly developed non-destructible rock fragmentation method, slow releasing energy material agent (SREMA), which is a modified soundless chemical demolition agent (SCDA). The review aims to address one of the main gaps in studies related to SREMA, by presenting a thorough understanding of the components of SREMA and their mechanisms of action, leading to volume expansion. Thus, this review would act as a guide for researchers working on using expansive materials for rock breaking. As many literatures have not been published regarding the recently discovered SREMA, studies on cements, expansive cements, and soundless chemical demolition agents (SCDA) were mainly considered. The chemical reactions and volume expansive processes of these materials have been studied and incorporated with the additives included in SREMA, to understand its behavior. Literature containing experimental studies analyzing the heat of hydration and microstructural changes have been mostly considered along with some of the heavily discussed hypotheses regarding the hydration of certain components, to predict the volume expansive mechanism of SREMA. Studies related to SREMA and other similar materials have shown drastic changes in the heats of hydration as the composition varies. Thus, SREMA has the capability of giving a wider range of expansive energies in diverse environmental conditions

show abstract

Section: In the Presence Of Sulfatesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Hydration and Volume Expansion Mechanisms of Modified Expansive Cements for Sustainable In-Situ Rock Fragmentation: A Review

Liyanage

Ranjith

2021

Energies

View full text Add to dashboard Cite

show abstract

“…Different leaching methods including neutral, acidic, and alkaline have been reported in U mining sites [50][51][52][53][54][55]. The present study investigated the processing of neutral leaching with the pH value being monitored in the experimental scope.…”

Section: Neutral Leachingmentioning

confidence: 99%

Geochemical Characteristics and Uranium Neutral Leaching through a CO2 + O2 System—An Example from Uranium Ore of the ELZPA Ore Deposit in Pakistan

Asghar

Sun

Chen

et al. 2020

Metals

Self Cite

View full text Add to dashboard Cite

Geochemical characterization studies and batch leaching experiments were conducted to explore the effects of a CO2 + O2 leaching system on uranium (U) recovery from ores obtained from an eastern limb of Zinda Pir Anticline ore deposit in Pakistan. The mineralogy of the ore was identified by Electron Probe Micro-analyzer (EPMA) and Scanning Electron Microscope-Energy Dispersive Spectrometer (SEM-EDS), showing that pitchblende is the main ore mineral. XRD was also used along with EPMA and SEM characterization data. Experimental results indicate that U mobility was readily facilitated in the CO2 + O2 system with Eh 284 mV and pH 6.24, and an 86% recovery rate of U3O8 was obtained. U speciation analysis implied the formation of UO2 (CO3)22− in the pregnant solution. The plausible mechanism may be attributed to the dissolved CO2 gas that forms carbonate/bicarbonate ion releasing oxidized U from the ore mineral. However, U recovery in the liquid phase was shown to decrease by higher U(VI) initial concentration, which may be due to the saturation of Fe adsorption capacity, as suggested by an increase in Fe concentration with increasing initial U(VI) concentration in the solid phase. However, further studies are needed to reveal the influencing mechanism of U(VI) initial concentration on U recovery in the solid phase. This study provides new insights on the feasibility and validity of the site application of U neutral in situ leaching.

show abstract

“…This solution is commonly referred to as a leaching agent. Leaching solution dissolves uranium as it passes through the uranium-containing host rock [5]. A solution saturated with uranium is called a pregnant solution.…”

Section: Introductionmentioning

confidence: 99%

Application of radio-wave geointoscopy method to study the nature of spreading the solutions in the process of uranium underground leaching

Tsoy¹,

Myrzakhmetov²,

Yazikov³

et al. 2021

Min. miner. depos.

View full text Add to dashboard Cite

Purpose. Assessment of the effectiveness of using the method of radio-wave geointoscopy of the inter-well space for three-dimensional mapping of the zone of the leaching solution actual propagation in the process of uranium mining by the method of underground leaching. Methods. Experimental-industrial studies of the leaching process are conducted at technological block 68 of the Semizbay deposit (Kazakhstan). In experimental studies, special equipment is used for conducting radio-wave geointoscopy. Inter-well measurements are performed using the RVGI-06 equipment. The observations are conducted in a fan pattern within the filter section. The step between adjacent points along the wellbore is 1 m. At different stages of mining the technological block, maps of geoelectric resistivity have been compiled, with the help of which a comparative analysis is performed. Findings. A tendency to an increase in the area of acidic solutions propagation over time has been revealed by comparing the fragments of RVGI geoelectric map at different stages of mining the block. The influence of a heterogeneous geological structure on the uniformity of the leaching solutions propagation has been proved. It has been determined that the resolving power of the radio-wave geointoscopy method is sufficient to detect changes in geoelectric conditions at small monitoring cycles in time. The spatial-temporal change in the front of the leaching solutions propagation makes it possible to determine the prevailing directions of solutions propagation and to assess the filtration characteristics of rocks. Originality. The patterns have been determined of the leaching solutions propagation over time from the beginning of block acidification to active leaching. The first attempts have been made to use the geophysical well logging method in the practice of uranium mining by In-Situ Leaching (ISL) method. Practical implications. Monitoring studies by radio-wave geointoscopy method at the stage of passive acidification can be re-commended for further experimental and scientific testing at technological blocks of the Semizbay deposit for a quantitative assessment of the filtration characteristics of rocks and the dynamics of the acidification process development, as well as for the development of well-grounded recommendations on the optimal scheme for mining the blocks in specific geotechnical conditions.

show abstract

Uranium recovery from sandstone-type uranium deposit by acid in-situ leaching - an example from the Kujieertai

Cited by 42 publications

References 19 publications

The Hydration and Volume Expansion Mechanisms of Modified Expansive Cements for Sustainable In-Situ Rock Fragmentation: A Review

The Hydration and Volume Expansion Mechanisms of Modified Expansive Cements for Sustainable In-Situ Rock Fragmentation: A Review

Geochemical Characteristics and Uranium Neutral Leaching through a CO2 + O2 System—An Example from Uranium Ore of the ELZPA Ore Deposit in Pakistan

Application of radio-wave geointoscopy method to study the nature of spreading the solutions in the process of uranium underground leaching

Contact Info

Product

Resources

About