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Identyfikacja faz w pyłach i spiekach z hutnictwa miedzi na przykładzie Huty Miedzi Głogów

Setkiewicz Krzysztof, Rogóż Katarzyna, Krzykawski Tomasz, Szopa Krzysztof

Przegląd Geologiczny

2025

Vol. 73, nr 4

431--434

During copper smelting, metallic accretions grow on the waste heat boiler ’s (WHB) walls. They are created due to the accumulation of flue dust particles suspended in the process off-gas with a rapid temperature drop from about 1400 to 350oC. Flue dust and accretions are made of compounds that resemble very rare minerals or new, undescribed phases. This association might prove vital in recreating conditions characteristic of the WHB, which could provide data necessary to improve the metal extraction process. In order to reach this goal, a number of flue dust and accretion samples were examined. SEM microscopy combined with MLA mapping and XRD analysis were used to identify the phase composition and structure of flue dust and accretion samples. Several copper and iron oxides (e.g. delafossite CuFeO2 and spinels) were identified. The samples examined are abundant in sulphates, including anhydrite, langbeinite and various copper-bearing components. Arsenates with copper and/or aluminium cations were identified as well. The analysed phase association shows similarities to minerals present in fumaroles. Some phases like alarsite Al(AsO4) or kamchatkite KCu3(SO4)2OCl are characteristic of a volcanic field on Kamchatka. The results of this study allow to observe the relation-ships between fumarolic phases and to describe the conditions in the WHB.

Geotechnical identification of soil deposits and clay sensitivity evaluation: A case study from East Algeria

Charef Nouar, Berrah Yacine, Boumezbeur Abderrahmane

Geomatics, Landmanagement and Landscape

2024

no. 3

21--33

This article provides an overview of a comprehensive study conducted in the Tebessa region of Algeria to identify and characterize sensitive soils susceptible to swelling. This phenomenon poses significant challenges to construction activities and infrastructure development in the area. The study employed a multidisciplinary approach, combining geotechnical and mineralogical analyses to understand the behavior of sensitive soils in the region. Geotechnical investigations involved laboratory identification tests, including Atterberg limits, grain size analysis, methylene blue value, sedimentometry, as well as mechanical tests: oedometer swelling and compressibility tests. Additionally, over 110 boreholes in four sectors were drilled in order to collect soil samples for the analysis. Classification of the studied soils was performed based on grain size distribution, Atterberg limits, and geotechnical properties, utilizing classification systems like LPC and GTR. Results indicated that the sensitive soils in the Tebessa region predominantly belonged to highly plastic clayey categories, exhibiting medium to extremely high swelling potential. Mineralogical analysis through X-ray diffraction provided insights into the composition of the clay fraction, with a focus on identifying swelling clay minerals, such as smectites. The study identified a significant presence of smectites in the soil samples, which are known for their high swelling potential. Integrating geotechnical and mineralogical analyses allows engineers to correlate mineral compositions with soil behaviors such as compaction, consolidation, and shear strength. This correlation predicts how the soil will respond to engineering activities such as construction and slope stability. In the Tebessa region, this integration improves the understanding of clayey soil behavior, aiding informed decisions for sustainable development and resilient infrastructure.