Extraction of uranium in caustic sludge from the production of nuclear fuel components by countercurrent dissolution and acid curing

Hu, Eming; Lei, Zhiwu; Wang, Hongqiang; Su, Hao; Zhou, Wen; Wan, Qiang; Zhu, Fangping; Wang, Qingliang

doi:10.1007/s10967-022-08234-z

Cited by 1 publication

(2 citation statements)

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“…The average recovery for REMs was 73.5%. The recrystallization of betafite by heat treatment appeared to promote the formation of an enriched surface layer, which may be related to a lower extraction of Nb [36]. The leaching residue mainly comprises minerals, such as quartz, iron sulfate, and gypsum, with stable properties.…”

Section: Validation Of Optimal Conditionsmentioning

confidence: 99%

“…As an effective method, sulfuric acid curing and leaching have attracted researchers' attention for the past few decades [34,35]. It mainly involves using concentrated sulfuric acid to react with ore: uranium forms uranyl sulfate, calcium silicate decomposes into gypsum and SiO 2 , and niobium oxide forms Nb 2 O 4 SO 4 [36]. At the same time, pyrite can be decomposed, exposing uranium and other valuable minerals wrapped in pyrite and improving the uranium leaching rate [37].…”

Section: Introductionmentioning

confidence: 99%

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Recovery of Valuable Metals from Polymetallic Refractory Concentrate by a Sulfuric Acid Curing and Leaching Method

Jiang,

Xue,

Jiang

et al. 2023

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Sulfuric acid curing and leaching is a promising technology for treating refractory ores. In this work, a refractory concentrate containing 3191 ppm uranium (U), 2135 ppm niobium (Nb), and 0.7% rare earth minerals (REMs) went through two stages: curing by high-concentration H2SO4 and leaching by low-concentration H2SO4. We investigated the behavior of those valuable metals during the two stages. For both curing and leaching, the operating parameters include the acid-to-solid ratio, time, temperature, and H2SO4 concentration. The recovery for U, Nb, and REMs was as high as 95%, 86%, and 73.5% using a curing acid-to-solid ratio of 1:1, curing temperature of 200 °C, curing time of 1 h, H2SO4 concentration of 98%, leaching liquid-to-solid ratio of 4:1, leaching time of 2 h, leaching temperature of 60 °C, and leaching H2SO4 concentration of 5 g/L. A “sulfuric acid curing–leaching-U extraction by N235–Nb recovery by resin adsorption–REMs’ recovery by resin adsorption” method was implemented, where the overall U, Nb, and REMs’ recovery reached 93.1%, 84.5%, and 69.6%, respectively.

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Section: Validation Of Optimal Conditionsmentioning

confidence: 99%