ALKALINE AUTOCLAVE LEACHING OF REFRACTORY URANIUM-THORIUM MINERALS

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ALAMDAR MILANI S.; SAM A.

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Paper Information

Journal: JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY Year:2011 | Volume:- | Issue:3 (57) Page(s): 59-67

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Information Journal Paper

Title

ALKALINE AUTOCLAVE LEACHING OF REFRACTORY URANIUM-THORIUM MINERALS

Author(s)

ALAMDAR MILANI S. | SAM A. | Issue Writer Certificate

Keywords

ALKALINE AUTOCLAVE LEACHINGQ2

URANIUMQ2

THORIUM REFRACTORY MINERALSQ2

BALL MILL AUTOCLAVEQ2

OMAN PLACERQ2

Abstract

This paper deals a with the study of an innovative method for processing the OMAN PLACER ores by alkaline leaching in BALL MILL AUTOCLAVEs, where grinding and leaching of the refractory minerals take place simultaneously. This was followed by the selective separation of thorium and URANIUM from lanthanides by autoclave leaching of the hydroxide cake with ammonium carbonate-bicarbonate solutions. The introduced method is based on the fact that thorium and URANIUM form soluble carbonate complexes with ammonium carbonate, while lanthanides form sparingly soluble double carbonates. It was found that a complete alkaline leaching of OMAN PLACER ores (98.0%) was attained at 150 and 175oC within 2.5 and 2h, respectively. OMAN PLACER ores leaching was intensified and accelerated in a BALL MILL AUTOCLAVEs as a result of the grinding action of steel balls, removal of the hydroxide layer covering ores grains and the continuous contact of fresh ore grains with alkaline solution. The study of selective carbonate processing of hydroxide cake with ammonium carbonate-bicarbonate solutions on autoclave under pressure revealed that the complete thorium recovery (97.5%) with URANIUM recovery (90.8%) and their separation from the lanthanides were attained at 70-80oC during 1-2h. The extraction of lanthanides in carbonate solution was low and did not exceed 4.6%.

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APA: Copy

ALAMDAR MILANI, S., & SAM, A.. (2011). ALKALINE AUTOCLAVE LEACHING OF REFRACTORY URANIUM-THORIUM MINERALS. JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY, -(3 (57)), 59-67. SID. https://sid.ir/paper/97553/en

Vancouver: Copy

ALAMDAR MILANI S., SAM A.. ALKALINE AUTOCLAVE LEACHING OF REFRACTORY URANIUM-THORIUM MINERALS. JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY[Internet]. 2011;-(3 (57)):59-67. Available from: https://sid.ir/paper/97553/en

IEEE: Copy

S. ALAMDAR MILANI, and A. SAM, “ALKALINE AUTOCLAVE LEACHING OF REFRACTORY URANIUM-THORIUM MINERALS,” JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY, vol. -, no. 3 (57), pp. 59–67, 2011, [Online]. Available: https://sid.ir/paper/97553/en

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