Navoi Mining and Metallurgical Company, Navoi, Republic of Uzbekistan

U. Z. Sharafutdinov, Associate Professor, Doctor of Technical Sciences

Navoi State Mining and Technologiсal University, Navoi, Republic of Uzbekistan
I. U. Khalimov, Associate Professor, Candidate of Technical Sciences, e-mail: halimov_i@bk.ru
S. B. Khamidov, Lecturer, e-mail: sukhrobkhamidov92@gmail.com
N. M. Karimov, Assistant Lecturer, e-mail: 92nurkhan92@gmail.com

Rhenium, present in the pregnant solutions generated as the result of uranium in-situ leaching in the form of perrhenate anion, is usually sorbed by polymer sorbents. Some rhenium is also present in uranium extraction solutions. The fact that polymer sorbents cannot be used to recover rhenium from uranium re-extracts because of the depressive action of dissolved organic substances makes this problem of relevance. Carbon adsorbents may become an alternative to synthetic ones in terms of kinetic characteristics. For this reason the former were chosen as the subject of this research study. The aim of this research is to understand the effectiveness of using carbon adsorbents for rhenium sorption and the use of various uranium re-extraction solutions for their desorption. The focus of this research is backwash carbonate re-extracts of uranium generated as the result of extractive processing of sulphuric acid solutions used in uranium in-situ leaching. Thus, the study looked at the sorption of rhenium from uranium re-extracts in dynamic mode with four different adsorbents. Data on the rhenium sorption in static and dynamic conditions were obtained. Goldsorb 4500 reached full saturation after 40 volumes of re-extract had passed through it, with the concentration of rhenium equal to 316 mg/L at the specific load of 1 h–1. Through experiments it was established that the rhenium sorption-desorption performance when using carbon adsorbents does not depend on the nature of adsorbents used. A 434.6 mg/L concentration of rhenium was reached in the effluent during desorption with 4N (252 g/L) nitric acid solution, the specific load of Goldsorb 4500 adsorbents being 0.5 h^–1. A preliminary removal of impurities from the saturated adsorbent with process water in order to minimize the absorption of uranium ions with adsorbents, conducted at t = 50 ^oC at the specific load = 3 h^–1, was found to be beneficial for the desorption performance. The effect is in the low concentration of uranium in the product after washing and desorption in static mode.

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