Purification of mineralized waters from U(VI) compounds using bentonite/iron oxide composites

Kovalchuk, Iryna; Тобілко, Вікторія; Kholodko, Yurii; Zahorodniuk, Nataliia; Kornilovych, Borys

doi:10.15587/2706-5448.2020.205146

Cited by 5 publications

(1 citation statement)

References 34 publications

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“…The profit from the involvement of substandard reserves in terms of the content of useful components in production is provided by increasing production volumes, increasing production and increasing the return on capital for combined leaching technologies [31,32]. The study of the processes of sorption purification of contaminated water was carried out using solutions, the composition of which, in terms of the main anionic components, corresponded to the composition of underground waters of the storage facility for liquid waste of uranium ore processing at the State Enterprise VostGOK (Zhovti Vody, Ukraine) [33]. This ensures a decrease in the degree of metal contamination of ground and surface waters, soils and sediments, including the main Michurynske fault and an anti-seepage curtain (constructed using technology, for example, a «wall in the ground») [34,35].…”

Section: 3mentioning

confidence: 99%

Evaluation of efficiency and environmental safety of leaching metals from ore: ways of development and prospects

Lyashenko¹,

Khomenko

Chekushina

et al. 2021

TAPR

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The object of research is traditional mining technologies and technical means in combination with underground block leaching (UBL) of metals from rock ores with their preliminary crushing with explosives in installations mounted in mine workings. One of the most problematic areas is the difficulty of achieving a given crushing quality, as well as the required height of ore storage in the chamber for the subsequent leaching of metals and a loosening factor, taking into account the control of the energy of explosive destruction of rock ores. The study used: – data from literary sources and patent documentation in the field of technologies and technical means for UBL of metals from ores in energy disturbed massifs, substantiation of technological parameters of operational blocks; – laboratory and production experiments; – physical modeling of metal extraction from ores from the average linear size of a piece of blasted ore. Analytical studies, comparative analysis of theoretical and practical results using standard and new methods were carried out with the participation of the authors. It was found that the most intensive infiltration leaching occurs when the size class of ore lumps is –100+0 mm. Metals are extracted from fractions –200+100 mm less intensively and for a longer time. To neutralize and flush the spent ore mass, it is recommended to treat it with lime solution and mine water through wells for supplying leaching solutions (irrigation system). The protection of the hydrogeological environment is carried out by silting the bottom of the chamber for collecting productive solutions with clay solution and by constant monitoring of mine water pollution in the zone of UBL influence. On the basis of the positive results obtained from the study and implementation of technologies for UBL of metals from rock ores during the development of block 5–86, in accordance with the recommendations issued, the same approach was used for blocks 5–84–86 and 5–88–90, as well as industrial experimental block 1–75–79. Due to the involvement in the production of substandard ores, the raw material base for the extraction of metals, at the operating mines, can be increased by 1.4–1.6 times. The research results can be used in underground mining of ore deposits of complex structure in Ukraine, the Russian Federation, the Republic of Kazakhstan and other developed mining countries of the world.

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Section: 3mentioning

confidence: 99%

Evaluation of efficiency and environmental safety of leaching metals from ore: ways of development and prospects

Lyashenko¹,

Khomenko

Chekushina

et al. 2021

TAPR

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Evaluation of the efficiency and environmental impact (on subsoil and groundwater) of underground block leaching (UBL) of metals from ores

Lyashenko¹,

Голик

Klyuev

2022

Min.Sci.Technol. (RUS)

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One of the most problematic aspects of underground block leaching (UBL) of metals from ores is the possibility of pollution of water and air in the affected zone. Therefore, proving the possibility of mitigating environmental impact of metal leaching from ores by managing production processes with the implementation of nature- and resource-saving technologies is an important objective. The purpose of this study is to justify underground development effectiveness of ore deposits by traditional and integrated methods with leaching of metals from substandard and off-balance ores. This will allow the raw material base for extraction of metals from off-balance ores to be expanded and the environmental impact on subsoil and groundwater (hydrogeological systems) to be mitigated. A distinctive feature of a UBL (underground site for leaching of metals from shrunk ores) is that leaching solutions are supplied from sorption column placed in mining workings of the leaching level in the immediate vicinity of the extracting block. The pregnant solutions in the form of resin are discharged from the sorption column, placed in the leaching level mine workings, then winded in mine cars and further supplied to hydrometallurgical plant in tanks. A still rare attempt to justify the efﬁciency and environmental safety of underground metal leaching (UBL) from off-balance and substandard rock ores in installations mounted in mine workings, on the basis of monitoring and evaluation of subsoil and groundwater conditions was investigated. The average value of uranium concentration by level was established: 210 m – 3.6 mg/L; 225 m – 3.58 mg/L; 280 m – 0.91 mg/L. At the same time no contamination of underground mine waters was detected. Levels of sulfuric acid aerosols and radon decomposition products did not exceed the maximum allowable concentration (MAC) values. It is recommended that the hydrogeological environment be protected through silting the bottom of the stope for collection of pregnant solutions with clay mud and construct semi-active water-permeable chemically active barriers. The mentioned BIL process was implemented during the development of pilot block 5-86 and recommended for blocks 5-84-86 and 5-88-90 of Michurinskoye deposit of SE VostGOK, Ukraine, as well as during for development of ore deposits in Russia, Kazakhstan, and other developed mining countries.

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Technologies and Technical Means for Electrosorption Leaching of Gold From Flotation Tailings of Resisting Sulfide Raw Materials

Lyashenko,

Dudar,

Oliynik

et al. 2024

Mining Revue

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Relevance. The problem of expanding the raw material base of the gold mining industry is becoming more pressing due to the depletion of explored reserves, rising production costs and the costs of minimizing the man-made impact on the environment. With the depletion of oxidized gold-bearing ores, finely disseminated ores are increasingly being involved in processing. An increase in gold production volumes can be achieved by improving the beneficiation process. An alternative to traditional beneficiation technologies is electrotechnologies that use the phenomenon of energy impact on mineral raw materials. Among them, the range of application of the resin-in-pulp electrosorption leaching technology is expanding. Objective. Justification of technologies and technical means for electrosorption leaching of gold from flotation tailings of refractory sulfide raw materials. This will increase metal production and strengthen the mineral resource base of gold mining enterprises and reduce damage to the environment. Methodology. A comprehensive method was applied, including analytical studies using the fundamentals of system analysis and mathematical statistics, technological experimentation using mathematical planning of experiments, economic and mathematical modeling, technical and economic calculations and pilot industrial implementation. Laboratory studies were modeled on the tailings of flotation enrichment of gold from the flotation tailings of refractory sulfide raw materials. The application of electric fields was provided by two parallel electrodes. Scientific novelty. Theoretical and technological experimentation, substantiation of fundamentally new technologies and technical means of electrosorption leaching of gold from flotation tailings of refractory sulfide raw materials. Results. The efficiency of using technogenic resources is achieved by combining traditional enrichment technologies with the capabilities of hydrometallurgy and electrochemistry. Flotation tailings of ores with gold content from 1.0-1.5 g/t are leached according to the scheme: granulation to a size of 15-30 mm with the addition of 1 g/l of cyanide, sulfuric acid removal of metals, alkaline treatment to pH 10-11, cyanidation with an irrigation density of 20 l/m2 per hour, gold sorption on anion exchanger, anion exchanger regeneration and regenerate electrolysis. Gold leaching from refractory sulfide raw materials is possible after the destruction of sulfides upon reaching an oxidation potential of 1000 mV, it effectively proceeds in a solution of 20-30% sodium chloride upon application of direct electric current with a density of 800-1200 A/m2, pH of the medium 2.0-4.0 and a temperature of 60-800 C with the extraction of up to 70-80% of gold into the solution with an electric power consumption of 120-220 kW/t. The results of the experiment confirm the efficiency of the technology of electrosorption leaching of gold from gold-bearing pulps. The leaching rate increases by 25-30%, the sorption capacity of the anionite AM-2B increases by 2.5-3 times. An increase in the capacity of the sorbent and a decrease in the amount of gold in the liquid phase shifts the equilibrium of the system towards gold dissolution and intensifies the volume and completeness of its extraction. Implementation. The technologies of electrosorption and electrochemical leaching of gold from ore flotation tailings have been tested and recommended for industrial development at the Aksu, Bestobe, Zholymbet deposits and implemented in the practice of ABS-Balkhash, Kazakhaltyn JSC (Republic of Kazakhstan) and can be recommended for other developed mining and gold mining countries of the world.

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Purification of mineralized waters from U(VI) compounds using bentonite/iron oxide composites

Cited by 5 publications

References 34 publications

Evaluation of efficiency and environmental safety of leaching metals from ore: ways of development and prospects

Evaluation of efficiency and environmental safety of leaching metals from ore: ways of development and prospects

Evaluation of the efficiency and environmental impact (on subsoil and groundwater) of underground block leaching (UBL) of metals from ores

Technologies and Technical Means for Electrosorption Leaching of Gold From Flotation Tailings of Resisting Sulfide Raw Materials

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