کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
643971 884401 2007 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Recovery palladium, gold and platinum from hydrochloric acid solution using 2-hydroxy-4-sec-octanoyl diphenyl-ketoxime
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
Recovery palladium, gold and platinum from hydrochloric acid solution using 2-hydroxy-4-sec-octanoyl diphenyl-ketoxime
چکیده انگلیسی

The selective extraction of Pd(II) over Au(III) and Pt(IV) as well as subsequently selective extraction of Au(III) over Pt(IV) from hydrochloric acid (HCl) solution were achieved by using 2-hydroxy-4-sec-octanoyl diphenyl-ketoxime diluted in kerosene as extractant. The typical composition of solution used for the present study contains Pd: 5.95 g/L, Au: 5.42 g/L and Pt: 10.23 g/L. Pd(II) is extracted into organic phase quantitatively after three-stage counter-current extraction operation with extraction percentage >99.9% at pH 2. At a higher HCl concentration (5 M), Au(III) is effectively extracted into organic phase from the resulting raffinate by four-stage counter-current extraction operation. On the other hand, stripping of Pd(II) from loaded organic phase needs high acid solution while the stripping of Au(III) can be achieved at pH 2. Four-stage stripping with 6 M HCl at O:A = 2:1 yielded >99.9% Pd(II) stripping efficiency and four stages stripping with 0.01 M HCl at O:A phase ratio of 2:1 performed >99.9% Au(III) stripping efficiency. The resulting solutions for each metal, after the corresponding process such as precipitation or reduction, can be used for yielding metal powder with the purity better than 99.99%. A complete process flow sheet for the separation and recovery of Pd(II), Au(III) and Pt(IV) is established based on the present investigation.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Separation and Purification Technology - Volume 56, Issue 3, 15 September 2007, Pages 278–283
نویسندگان
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