Study of technological properties of the sample ethiopian iron ore of the arabian-nubian shield. Part 1. Study of the substance composition of the ore sample
DOI:
https://doi.org/10.32782/2225-6733.44.2022.3Keywords:
iron ore, Arabian-Nubian shield, ore mining, mineralogy, iron contentAbstract
A literary analysis of the presented studies of the Arabian-Nubian shield, its history of formation and geological features was performed. It was found that the iron ores of Ethiopia have a certain technological value, but the technological expediency of their enrichment should be confirmed by relevant studies. A sample of iron ore from an Ethiopian deposit was received and prepared for research. Preparation and work with the samples took place in accordance with the state standards of Ukraine. A sieve analysis of the material of the original sample of iron ore from the Arabian-Nubian shield, which was received for research, was performed. It was found that the genetically studied raw material is a product of chemical weathering of the original volcanic-sedimentary rock. The structure of the rock is fine-grained, oolitic, sometimes hornblende, porphyry, rarely psammitic and psephytic. The texture is powdery, mottled, in some places conglomerate-like, breccia-like, hollow, interspersed, almond-like. The chemical analysis of various samples for the content of total iron and silicon showed an even distribution of components by class. An initial examination of +5 mm fragments was performed, which showed that they consist mainly of two components - the separation of quartz and the cement that binds them. Based on the results of the analysis, four types of fragments were distinguished by the content of cement, which is represented by suric-ochre-clay cement: low-clay with a content of 5-10% cement, medium-clay with a content of 10-50% cement, clay with a content of more than 50% of cement and poor clay. The ore separation of the material was carried out, with the selection of five mineralogy-petrological varieties. The mineral composition is mainly represented by dispersed hematite, hydrohematite and quartz. There is also goethite, hydrogoethite, kaolinite and calcite. A single phenocryst of chalcopyrite was noted. The conclusions reached regarding the mineralogical and petrographic composition of the presented ore provide a basis for further electron-microscopic studies and analysis of the ore for the possibility of its enrichment
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