Extraction of Iron Oxide and Concentration of Titanium Compounds in Red Mud

Magalhães, Edílson Marques; Macêdo, Emanuel Negrão; Quaresma, Danielly da Silva; Souza, José Antônio da Silva; Quaresma, João Nazareno Nonato

doi:10.1002/9781118359341.ch40

Cited by 2 publications

(1 citation statement)

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“…The increase in impacts on production has driven the interest in finding new ways to reuse waste materials [1], however, this reuse should be evaluated not only from the environmental point of view but also economically [2]. The main bauxite beneficiation step for the production of alumina (Al 2 O 3 ) is digestion with concentrated sodium hydroxide (NaOH) at high temperatures (up to 250 °C) and low pressures, which results in the formation of aluminate ions [Al(OH) 4 ] -, from gibbsite [Al(OH) 3 ] and boehmite [AlO(OH)], and a solid material known as bauxite residue, composed mainly of iron oxides, quartz, sodium aluminosilicates, calcium carbonate, aluminates, titanium dioxide, and other metal oxides [3,4]. This process is known as Bayer, being considered the most widely used method in the treatment of bauxite for alumina production [5].…”

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confidence: 99%

Influence of free silica in the production of synthetic aggregates from bauxite residue

Vilhena,

Viegas,

Souza

et al. 2023

Cerâmica

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The residue from the Bayer process has physicochemical characteristics that allow its use in the production of synthetic aggregate, although some characteristics such as low plasticity and water absorption still need better control. In this work, the influence of clay and silica addition on the sintering of synthetic aggregate produced from bauxite residue was analyzed. Compositions containing bauxite residue-sand-clay were elaborated, whose processing occurred using extrusion and crushing, followed by sintering at 1200 °C for 3 h. The X-ray diffraction analyses indicated the presence of new phases such as nepheline, originating from sodalite, and mullite resulting from the decomposition of kaolinite. Increasing the amount of free silica in the mixture resulted in an aggregate with a higher bulk density and lower water absorption, indicating that the amount of this raw material influenced the aggregate properties.

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Section: Introductionmentioning

confidence: 99%

Influence of free silica in the production of synthetic aggregates from bauxite residue

Vilhena,

Viegas,

Souza

et al. 2023

Cerâmica

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Análisis Del Proceso De Extracción De Hierro Desde El Lodo Rojo Generado en Una Industria De Aluminio Venezolana

2023

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El presente trabajo muestra el estudio del proceso de extracción de hierro proveniente de lodos rojos a través de su lixiviación con ácido sulfúrico (H2SO4) bajo un diseño de experimentos factorial de dos niveles con cuatro factores (24). Los factores analizados en este trabajo fueron: temperatura de reacción, tiempo de contacto, concentración del ácido y relación líquido a sólido. Se observó que la temperatura de reacción es el factor con mayor incidencia en la cantidad de hierro extraída (80,89%), seguido de la concentración de ácido (3,54 %). La interacción de segundo orden (relación líquido a sólido y temperatura de reacción), de tercer orden (concentración, tiempo y temperatura de reacción) y cuarto orden (concentración de ácido, tiempo de contacto, relación líquido-sólido y temperatura de reacción) afectan de manera significativa la variable respuesta. En base a los factores e interacciones más significativas, se seleccionó como mejor condición para la lixiviación: 30 %v/v de ácido sulfúrico, 3 horas de reacción, relación líquido a sólido 30 mL/g y temperatura de 100 ºC.

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Extraction of Iron Oxide and Concentration of Titanium Compounds in Red Mud

Cited by 2 publications

References 3 publications

Influence of free silica in the production of synthetic aggregates from bauxite residue

Influence of free silica in the production of synthetic aggregates from bauxite residue

Análisis Del Proceso De Extracción De Hierro Desde El Lodo Rojo Generado en Una Industria De Aluminio Venezolana

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