| 摘要 |
Process for pretreatment, at atmospheric pressure or near atmospheric pressure, by alkaline moistening and raising the temperature, of ground ores in which the gangue contains clayey compounds capable of forming a plastic suspension which is stable in the presence of water and containing at least one metallic element upgradable by hydrometallurgy, which is characterised in that, with the aim of permitting easy subsequent separations of the liquid and solid phases: a. The ore whose particle size does not exceed the mesh for release of the metallic element to be upgraded is placed in intimate contact with at least 4 kg, expressed as OH<->, of at least one alkaline agent per ton of clay contained in the ore; b. The moistened mixture is subjected to the removal of the water which is present and capable of being released until a ratio of liquid phase, expressed in cubic metres, to solid phase, expressed in tons of ore, (L/S in m<3>/t) not exceeding 0.2 is obtained; finally, c. The moistened mixture thus treated is heated to a minimum pretreatment temperature of at least 105 DEG C. T
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