Mineralogy and uranium leaching response of low grade South African ores

被引：98

作者：

Lottering, M. J. ^{[1
]}

Lorenzen, L. ^{[1
]}

Phala, N. S. ^{[3
]}

Smit, J. T. ^{[3
]}

Schalkwyk, G. A. C. ^{[2
]}

机构：

[1] Univ Stellenbosch, Dept Proc Engn, ZA-7602 Matieland, South Africa

[2] Anglo Res, Dept Mineral, ZA-1412 Homestead, South Africa

[3] Anglo Res, Dept Technol, ZA-2025 Crown Mines, South Africa

来源：

MINERALS ENGINEERING | 2008年 / 21卷 / 01期

关键词：

hydrometallurgy; leaching;

D O I：

10.1016/j.mineng.2007.06.006

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

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. (c) 2007 Elsevier Ltd. All rights reserved.

引用

页码：16 / 22

页数：7

共 7 条

[1]

FORD MA, 1994, M410 MINTEK

[2]

GLATTHAAR GW, 1979, MODE OCCURRENCE URAN

[3]

HAYES P, 2003, PROCESS PRINCIPLES M, P227

[4]

IFILL RO, 1996, CIM B JUN

[5]

LIEBENBERG WR, 1955, T GEOLOGICAL SOC S A, V58, P108

[6] SOME ASPECTS OF THE URANIUM MINERALS IN WITWATERSRAND SEDIMENTS OF THE EARLY PROTEROZOIC [J].

SMITS, G .

PRECAMBRIAN RESEARCH, 1984, 25 (1-3) :37-59

[7] Dissolution of synthetic brannerite in acidic and alkaline fluids [J].

Zhang, Y ;

Thomas, BS ;

Lumpkin, GR ;

Blackford, M ;

Zhang, Z ;

Colella, M ;

Aly, Z .

JOURNAL OF NUCLEAR MATERIALS, 2003, 321 (01) :1-7

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