Using ultrasonic and microwave devices to dry and disperse soils with high Fe2O3 content from Brazil

Barbosa, Samara Martins; Carducci, Carla Eloize; Serafim, Milson Evaldo; Zeviani, Walmes Marques; Albach, Breidi; Castro, Elisa de Melo; Oliveira, Geraldo César de

doi:10.1016/j.geodrs.2021.e00419

Cited by 2 publications

(1 citation statement)

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“…As in the study of Baratian et al [20], based on the Fenner diagram with respect to MgO, the amount of magnesium oxide in polymineral clay correlated with the content of free quartz, alumina, and iron oxide. In contrast to the representative soils of Brazil with low, high, and medium concentrations of iron oxides (including oxides and oxyhydroxides -goethite α-FeOOH, hematite α-Fe 2 O 3 , maghemite γ-Fe 2 O 3 , and magnetite Fe 3 O 4 , which was the main clay mineral) considered by Barbosa et al [21], only magnetite was present in our clay in a small amount. According to the results of X-ray phase analysis, the number of crystal structures after DTA decreased by 35% due to the complete amorphization of montmorillonite and calcite decomposition [22].…”

Section: Resultscontrasting

confidence: 91%

Thermostimulated crystal structure transformation of the polymineral clay submicron particles

et al. 2022

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Changes in the structure of phyllosilicate microparticles of submicron fractions of polymineral clay with an average size of 290 nm, as well as changes in the positions of impurity ions of transition metals in the crystal lattice, were studied by X-ray diffraction analysis, Fourier transform infrared spectroscopy, and high-resolution electron paramagnetic resonance spectroscopy. The main composition of microparticles included clinochlore, montmorillonite, calcite, and quartz. Structural transformations were stimulated by heating the samples to 1200 K at a rate of 10 K/min. A decrease in the number of crystal structures of microparticles was recorded due to the amorphization of montmorillonite, the decomposition of calcite, and the formation of sillimanite. Structural rearrangements of crystal cells containing impurity paramagnetic ions Fe 3+ and Mn 2+ in submicron particles of clinochlore and montmorillonite, accompanied by displacements and changes in the chemical bonds of these ions, were recorded by the ion-electron paramagnetic resonance method. It is shown that when microparticles were heated to 1200 K, the impurity paramagnetic ions of transition metals did not go beyond their crystal cells.

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Section: Resultscontrasting

confidence: 91%