[en] Ore microscopy can be an important adjunct to beneficiation, because it can be used not only to predict mill problems of undeveloped ore deposits but to identify the causes for the loss of minerals in the products of operating mines and mills. Mineral distribution among various mill products can be determined by examining polished sections prepared from samples obtained from each step of the beneficiation process. The degree of liberation of each mineral can be quantitatively determined for each mill product by counting locked vs. free particles. For many beneficiation problems, the preparation of a few polished sections of carefully selected mill products can yield useful information, which the mill dressing engineer can effectively use to alleviate those problems

[en] Process for recovering at least one metallic element selected from within the group composed of uranium, molybdenum, vanadium, copper, selenium and germanium contained in kerogeniferous ores. In particular, it relates to a process for the more complete recovery of the uranium contained in certain sedimentary ores. It involves: - grinding the ore down to the mesh that will release the kerogen particles, - separating the kerogen from the carrying ores by flotation, - modifying the kerogen by heating, - processing the residue for extraction of the elements it contains

[en] The proceedings of session ''Mineral raw materials treatment'' contain 27 papers of which only one deals with the application of nuclear technology, namely, the effect of fast electrons on the magnetic properties of the polymetallic Rudniany ore. (J.B.)

[en] The plant is described. Ore preparation, sulfuric attack, filtration, solvent extraction reextraction by brine, precipitation, effluent processing and water treatment are reviewed. Technical and economical information on capacity, personnel, consumptions and results obtained since the starting up in June 1979 are given. 438 t of uranium were produced in 1984

No abstract available

[en] Two processing methods (NH₃ leaching and SO₄H₂ leaching) were studied from an economic point of view: investment, processing costs and freight charges

[en] The present investigation aims, at a higher detail level, to identify, from systematic studies, the most important variables of the column flotation and also to check continuous flotation circuits ntegrating columns and mechanical cells to process the -10μm + 3μm fraction from the Itataia ore. The results obtained with the use of only one column as the rougher stage of direct flotation demonstrated a good selectivity, leading to P₂O₅ and R₂O₃ (Fe₂O₃ + Al₂O₃) grade of 24.2 % and 2.79 %, respectively, with p₂O₅ recovery of 68.5 %. The results of this investigation indicate that the combination of the column concentrate with that of the conventional flotation circuit increases the overall recovery of P₂O₅ an U₃O₅ in 5%, in the physical concentration, without impairing the utilization of the final concentrate. (author)

[en] The plant for ore treatment is described. Ore preparation, crushing, alkaline attack, by Na₂CO₃, washing of solid residues, treatment of uraniferous liquors and effluents are reviewed. Technical and economical information on capacity, personnel, consumptions and investments are given. 881 t of uranium were produced in 1984

[en] A basic description of technical activities involved in chemical and physical processes studies to Itataia ore processing, in Brazil is prese nted. (C.M.)

No abstract available