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Soil remineralizer
Published in Natalia Yakovleva, Edmund Nickless, Routledge Handbook of the Extractive Industries and Sustainable Development, 2022
Suzi Huff Theodoro, David A. C. Manning, André Mundstock Xavier de Carvalho, Fabiane Rodrigues Ferrão, Gustavo Rosa de Almeida
According to the Ministry of Mines and Energy, based on data from the National Mining Agency, Brazil remains an important global player in the production and export of mineral products. Table 13.1 shows the top ten mineral products, the size of the reserve and the world market share (%) of these products (which excludes construction aggregates) in international mineral geopolitics.
Strategising the bioremediation of Brazilian iron ore mines
Published in Critical Reviews in Environmental Science and Technology, 2022
Alan Levett, Emma Gagen, Anat Paz, Paulo Vasconcelos, Gordon Southam
Monitoring and surveying with the improved surface will be critical to ensure long-term, successful remediation of iron ore mines in Brazil. Water chemistry monitors should be used to measure any runoff solutions not entrapped during mineral precipitation and cement formation, including turbidity, electrical conductivity, pH, dissolved and suspended solids, nutrients including nitrogen and phosphorus, as well as iron and aluminum in solution. Importantly, the improved surface should resist erosion and promote the runoff of rainwater and the dewatering of the mine tailings. Therefore, safely integrating the remediated mine site into the hydrogeology of the region will be vital to the successful remediation. The strength of the improved surface should be measured using instrumentation such as a dynamic cone penetrometer and the resistance of the biocements to erosion and liquefaction should be determined. Microbial profiling has been used to monitor soils in remediated mine sites (Fernandes et al., 2018; Gastauer et al., 2019; van der Heyde et al., 2020), which may also be a value tool for canga ecosystems. Overall, the successfulness of remediation will be determined by ecosystem surveys, comparing the remediated site with a non-remediated site and a conserved, non-mine affected site. Successful re-vegetation of threatened canga ecosystems postmining to reinstate native plant species is important for the sustainability of iron ore mining in Brazil.
Feasibility study on the use of thiosulfate to remediate mercury-contaminated soil
Published in Environmental Technology, 2019
Chao Han, Hui Wang, Feng Xie, Wei Wang, Ting’an Zhang, David Dreisinger
Mercury contamination has caused great concern worldwide. Soil mercury contamination, in particular, has been found at many active and inactive industrial places, such as mining sites and chemical manufacturing facilities [1–5]. Varied levels of mercury contamination in soil have been found in the vicinity of these industrial facilities when mercury and its compounds were used or produced. Pataranawat et al. reported that a mercury level of 10.5 mg kg−1 was detected in surface soil collected from a small-scale gold-mining area in Phichit, Thailand [6]. The total mercury concentration in soil samples collected from the Tapajós gold-mining site (Brazil) was nearly 13 times higher than the background sites [7]. Mercury emission from the refining of non-ferrous metals is also a major source of mercury contamination. The deposition of atmospheric mercury onto soils surrounding metal smelters is commonly observed. Rieuwerts and Farago reported that the mercury concentration of soil samples collected from the lead smelting town of Pribram (Czech Republic) is in the range of 0.07–2.32 mg kg−1 [8]. Stafilov et al. reported that mercury in soil samples collected at a lead and zinc industrial region in the Republic of Macedonia is in the range of 0.01–12 mg kg−1 [9]. Bernaus et al. reported that the level of mercury contamination of the soil around a chlor-alkali plant in the Netherlands reached as high as 1150 mg kg−1 [10].
Iron ore pellet drying assisted by microwave: A kinetic evaluation
Published in Mineral Processing and Extractive Metallurgy Review, 2018
Maycon Athayde, Mauricio Cota, Maurício Covcevich
Iron ore concentrate (Mariana mining complex – Brazil) was prepared from run of mine (ROM) in pilot scale concentrator by mechanical flotation and ball milling (Table 2). Other raw material for the pelletizing mixture was Brazilians bentonite and limestone and South African anthracite coal. Limestone was added to achieve a binary basicity of 0.8 and anthracite added to achieve 1%C. The final moisture content was 10% added at a pilot Erich mixer.