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The beneficiation of lean semioxidized lead-zinc ores. Technical and economical evaluation of different flotation flowsheets applied to Sardinian ores
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Advances in coal flotation technology
No full textPoor results are generally achieved in the treatment of coal slimes using conventional
methods. Since fine size fractions below 0.5 mm can together represent a significant portion
of the plant’s feed, the development of suitable technologies for an efficient recovery of their
fuel content can add a considerable contribution to the economic balance of the beneficiation
process. Together with oil agglomeration, froth flotation can be regarded as the most
attractive technique for treating such slimes. In order to create the most favourable conditions
for the full development of collection and separation mechanisms, a new approach has been
devised and tested, according to which agitation is produced using high velocity water jets
generated through a suitable nozzle configuration. The paper illustrates the features of the
prototype installed at the Waterjet Laboratory of the University of Cagliari and describes the
results obtained in the cleaning of coal fines. In particular the influence on technical results of
the various operational variables, like water pressure and flowrate, collector and frother
dosage and residence time, is illustrated and discussed
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