کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
233925 465374 2010 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Thorium and uranium extraction from rare earth elements in monazite sulfuric acid liquor through solvent extraction
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Thorium and uranium extraction from rare earth elements in monazite sulfuric acid liquor through solvent extraction
چکیده انگلیسی

This paper describes the process of extraction of thorium and uranium from the sulfuric liquor generated in the chemical monazite treatment through a solvent extraction technique. The influence of the extractant type and concentration, contact time between phases, type and concentration of the stripping solution and aqueous/organic volumetric ratio were investigated. The results indicated the possibility of extracting, simultaneously, thorium and uranium from a solvent containing a mixture of Primene JM-T and Alamine 336. The stripping was carried out with a hydrochloric acid solution. After selecting the best conditions for the process, a continuous experiment was carried out in a mixer-settler circuit using four stages in the extraction step, five stages of stripping and one stage of the solvent regeneration. A loaded stripping solution containing 29.3 g/L of ThO2 and 1.27 g/L of U3O8 was obtained. The metals content in the raffinate was below 0.001 g/L, indicating a thorium extraction of over 99.9% and a uranium extraction of 99.4%. The rare earths content in the raffinate was 38 g/L of RE2O3.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Minerals Engineering - Volume 23, Issue 6, May 2010, Pages 498–503
نویسندگان
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