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The ceramic materials industry has vast potential for use of waste from industrial processes, such as iron mining tailings. The aim of this study was to test technological use of tailings samples from the dam rupture of the Samarco S.A. Company in 2015 to produce structural ceramics. Sedimentation and flotation processes were used to improve their characteristics, analyzing their chemical and mineralogical composition and granulometry. We produced 48 samples with a mixture of soil and residues in proportions of 10, 20, and 30 wt%, with sintering at 950 °C. The results showed that co-processing of iron mining tailings can be considered viable for improving certain aspects of some technological properties. The maximum amount of residue used was 30 wt% for any of the fractions used, as above this concentration the specimens lose important characteristics.
Igor Amaral; Luis Cavalcante; José Fabris; Bernat Prat; Arlete Reis. Use of Mining Tailings or Their Sedimentation and Flotation Fractions in a Mixture with Soil to Produce Structural Ceramics. Sustainability 2021, 13, 911 .
AMA StyleIgor Amaral, Luis Cavalcante, José Fabris, Bernat Prat, Arlete Reis. Use of Mining Tailings or Their Sedimentation and Flotation Fractions in a Mixture with Soil to Produce Structural Ceramics. Sustainability. 2021; 13 (2):911.
Chicago/Turabian StyleIgor Amaral; Luis Cavalcante; José Fabris; Bernat Prat; Arlete Reis. 2021. "Use of Mining Tailings or Their Sedimentation and Flotation Fractions in a Mixture with Soil to Produce Structural Ceramics." Sustainability 13, no. 2: 911.
It is reported an innovative though still exploratory study devoted to characterizing their structure and evaluating the response of zeolite-magnetite composites as adsorbing materials to remove Hg2+ from water. The zeolite material collected from a sampling site in Parral, Chile, was identified and structurally characterized as containing mordenite with crystallographic orthorhombic unit cell dimensions a = 18.060(1) Å; b = 20.429(2) Å and c = 7.5091(7) Å. From Mössbauer data, two paramagnetic ferric iron sites occur in its structure. This zeolite, a sample of synthetic magnetite and their two-component composites were used as adsorbers to sequester Hg2+ dissolved in water. The adsorption rate was found to reach a steady state of nearly constant Hg concentrations corresponding to 26.2; 22.1; 20.6; 17.4 and 16.7 mg Hg per g adsorber, between 24 h and 72 h reaction, for the samples zeolite only, for the composites zeolite:magnetite mass ratio 10:1; 5:1; 1:1 and for the magnetite only, respectively. These corresponding maximum adsorption capacities reduced the initial concentration of Hg2+ in water from 700 mg L−1 to an equilibrium concentration of 0; 110; 150; 240 and 250 mg L−1, respectively. Although the composites showed a lower adsorption capacity of Hg than did the sole zeolite (zeol sample), the composites contained magnetic particles, which allow the adsorbing systems to be readily removed from the aqueous medium, with a magnetic field. These combined characteristic point to the remarkable potential of such materials, particularly the mag-zeol-2, to be used to remediate natural bodies of water contaminated with Hg.
Ângela Leão Andrade; Luis Carlos Cavalcante; José Domingos Fabris; Marcio Pereira; José Domingos Ardisson; Carmen Pizarro. Zeolite-magnetite composites to remove Hg2+ from water. Hyperfine Interactions 2019, 240, 83 .
AMA StyleÂngela Leão Andrade, Luis Carlos Cavalcante, José Domingos Fabris, Marcio Pereira, José Domingos Ardisson, Carmen Pizarro. Zeolite-magnetite composites to remove Hg2+ from water. Hyperfine Interactions. 2019; 240 (1):83.
Chicago/Turabian StyleÂngela Leão Andrade; Luis Carlos Cavalcante; José Domingos Fabris; Marcio Pereira; José Domingos Ardisson; Carmen Pizarro. 2019. "Zeolite-magnetite composites to remove Hg2+ from water." Hyperfine Interactions 240, no. 1: 83.