| 1. |
- Forssberg, Eric, et al.
(författare)
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Influence of grinding method on complex sulphide ore flotation: a pilot plant study
- 1993
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Ingår i: International Journal of Mineral Processing. - 0301-7516 .- 1879-3525. ; 38:3, s. 157-175
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Tidskriftsartikel (refereegranskat)abstract
- The present work deals with plant investigations on the influence of conventional and autogenous grinding methods in the floatation of a complex sulphide ore. The study includes the investigation of the particle size and shape analysis and the pulp chemical measurements-Eh, pH, O2 concentration of cations and anions, at several stages of the grinding and flotation circuits. The rougher floatation concentrates of the Cu-Pb and Zn circuits were analysed to evaluate the floatation behaviour of chalcopyrite, galena and sphalerite. The results indicate better liberation of minerals in coarse size fractions for the pulp ground by autogenous mill while conventional grinding shows higher degree of liberation in the fine size range. Metallurgical analyses of the final floatation concentrates shows higher recoveries of Cu, Pb and Zn for the pulp ground by autogenous milling. The grades of Cu and Pb were better with conventional grinding but the recoveries were less than those obtained by autogenous grinding. Several interesting observations concerning pulp chemistry (e. g. the concentrations of Fe ions is lower in pulps ground by conventional method than by autogenous means!) are discussed.
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| 2. |
- Forssberg, Eric, et al.
(författare)
-
Treatment of uranium extraction residues
- 1987
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Ingår i: Erzmetall. - 0044-2658. ; 40:7, s. 398-406
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Tidskriftsartikel (refereegranskat)abstract
- The report contains a brief review of the various unit processes for uranium extraction, particularly extraction in an acid environment. The properties and treatment of the residues are described in detail with reference to the uranium deposit at Lilljuthatten in the Swedish province of Jamtland. The results show that the tailings have good properties from an environmental standpoint. This is largely because the ore does not need to be ground to small particle sizes for leaching. The properties of the tailings can be further improved by stabilization with cement or pozzuolane.
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| 3. |
- Nilsson, Leif K., et al.
(författare)
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Solubility of radionuclide species from uranium mill tailings
- 1988
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Ingår i: Minerals Engineering. - : Elsevier BV. - 0892-6875 .- 1872-9444. ; 1:4, s. 295-310
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Tidskriftsartikel (refereegranskat)abstract
- Present report describes solubility of different radionuclides, especially Ra-226, from uranium mill tailings. The solubility in water has been studied in both column and shake flask leaching tests. The test material used came from a uranium deposit at Lilljuthatten in the Swedish province of Jamtland. -The results of the study show that neutralization sludge and/or fine particles have an adsorbing capacity on Ra-226. Furthermore, by adding barium sulphate to the tailings pile a substantial decrease of Ra-226 in the water could be observed.
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