کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
234172 465391 2008 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Mineralogy and uranium leaching response of low grade South African ores
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Mineralogy and uranium leaching response of low grade South African ores
چکیده انگلیسی

The efficiency of uranium leaching determines the economic viability of treating low grade uranium deposits, and is quite sensitive to ore characteristics. The interrelationship between mineralogy, mineral liberation and the leaching behaviour of uranium is not well defined. Uraninite’s leaching kinetics are well studied, but relatively little leaching research has been conducted for other uranium minerals.Dissolutions higher than 90% are very difficult to achieve under the normal operating conditions employed for acid leaching of South African ores. In this paper, a mineralogy-leachability explanation is presented to rationalise the difficulty in exceeding 90% dissolution from low grade uranium ores in the Vaal River region (averaging 0.3 kg U3O8/t). Based on the findings, further discussed in the paper, it appears that brannerite’s intrinsic inertness is responsible for not obtaining optimum recoveries.It is also shown that for low grade uranium ores in the Witwatersrand context, the real value of uranium leaching could lie in the unlocking of extra gold (0.4–0.6 g/t) by the uranium leaching process that typically precedes cyanide leaching of gold.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Minerals Engineering - Volume 21, Issue 1, January 2008, Pages 16–22
نویسندگان
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