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Дата издания
31.10.2024Область исследования
Тип исследования
Аннотация (краткое описание)
A technology for bacterial iron oxidation in the process of in-situ leaching of uranium has been developed and proposed for industrial use. The technology was validated by the results of pilottests conducted at a uranium deposit in Ka-zakhstan over a period of 12 months. The aim of the study was to develop a technology for bacterial iron oxidation in the pro-cess of in-situ uranium leaching using a new type of flow bioreactor. Two biotechnological installations with bioreactors of 20 m³ volume were created and installed in 40-foot containers. The bioreactors, equipped with piping, air compressors, a pumping station, and control and measuring instruments, were installed at the geotechnical site and connected to the main in-situ urani-um leaching system through wells. The installations had a productivity of over 150,000 m³/year for the leaching solution. After passing through the bioreactors, the redox potential of the solution increased from 360 mV to 430-450 mV in flow mode. The concentration of ferric iron increased from 0.1 g/L to 1.5 g/L and higher. The bacterial iron oxidation process was carried out at a solution temperature of 10 to 12°C (optimal temperature —25-35°C), which allowed eliminating the costs of heating the solution.The test results showed an increase in uranium content in the productive solution by 10-20% after the leaching solu-tion passed through the ore-bearing layer for 1 month. This confirmed the prospects for using this technology for in-situ well uranium leaching. The economic costs of using the technology are 6-8 times lower compared to using chemical oxidants such as hydrogen peroxide. The obtained industrial results open new prospects for the application of biotechnological methods for in-situ well leaching of uranium and other metals for the first time.DOI
https://doi.org/10.51301/ejsu.2024.i5.04Тип публикаций
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Научные издания SU
Engineering Journal of Satbayev University