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Patent
Yiyang Hongyuan Rare Earth Co. | Date: 2013-07-24

The invention relates to a separation and recovery method for radioactive waste slag and specifically relates to a separation and recovery method for monazite slag. The separation and recovery method comprises the following steps: acid leaching, pressure filtration, water washing, extraction of valuable components and treatment of filtration slag. The separation and recovery method provided by the invention performs low-acid and low-temperature leaching on monazite slag, so that a liquid phase and a solid phase are easy to separate; after an ore dressing process is adopted for performing ore dressing and alkali decomposition on secondary slag, closed-loop circulation and recovery of uranium, thorium and rare earth is realized; and simultaneously, extraction raffinate waste acid is recycled, so that the emission of waste water is reduced, the consumption of sulfuric acid and fresh water and the treatment cost of the waste water are reduced, the production cost is reduced, the recovery rate of the valuable elements, namely the uranium, the thorium and the rare earth is more than 97%, and the whole process has no emission of the radioactive waste water and waste slag.


Trademark
Yiyang Hongyuan Rare Earth Co. | Date: 2012-03-06

Alkaline-earth metals; Cerium; Dysprosium; Erbium; Europium; Hydrogen; Lanthanum; Neodymium; Rare earths; Samarium; Scandium; Terbium; Thulium; Ytterbium; Yttrium.


Liu W.,Yiyang Hongyuan Rare Earth Co. | Yang Y.,Yiyang Hongyuan Rare Earth Co. | Cui X.-Z.,Yiyang Hongyuan Rare Earth Co.
Chinese Rare Earths | Year: 2014

The zirconium scandium separation problems always exist in the process of scandium recovering from titanium dioxide production. Hydrofluoric acid (HFA) is used to wash rich scandium zirconium organic phase. Research shows that when the concentration of hydrofluoric acid is 0.3 mol/L ~ 0.8 mol/L, the elution rate of zirconium is between 28.23% ~ 77.87% and the scandium concentration less than 2 μg/ml. When the concentration of hydrofluoric acid is greater than 0.8 mol/L, scandium in lotion is greater than 2 μg/ml and increases as HFA increasing. The washing effect is poor when washing time less than 10 min or more than 15 min and most zirconium can be eluted for 10 min ~ 15 min. The efficiency of single-stage washing is better than the cascade. When ratio of organic phase volume to water phase volume is 2:1, the washing result is the best. ©, 2014, Editorial Office of Chinese Rare Earths. All right reserved.


Cui X.-Z.,Yiyang Hongyuan Rare Earth Co. | Chen Y.-H.,Yiyang Hongyuan Rare Earth Co. | Ren P.,Yiyang Hongyuan Rare Earth Co. | Zhu Y.,Yiyang Hongyuan Rare Earth Co. | Xu G.-M.,Yiyang Hongyuan Rare Earth Co.
Chinese Rare Earths | Year: 2015

Acid leaching residue of monazite concentrate decomposed by alkali contains REO, ThO2, U3O8 and undecom-posed valuable minerals such as zirconite and monazite. This paper presents a beneficiation-metallurgy combination process to recover uranium, thorium and rare earth in the residue in a closed-circuit circulation system in low acidity and low temperature. The overall recovery of U, Th and rare earth is higher than 97%. Release of radioactive materials has been reduced to minimum. ©, 2015, Editorial Office of Chinese Rare Earths. All right reserved.

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