Experimental and modelling studies on the aeration leaching process for metallic iron removal in the manufacture of synthetic rutile

Geetha, K.; Surender, G. D.

doi:10.1016/s0304-386x(00)00065-7

Cited by 18 publications

(15 citation statements)

References 21 publications

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“…While the complexity of mass transfer in remediation Fe 0 /H 2 O systems is yet to be properly assessed, the Becher process for the manufacture of synthetic rutile has already dealt with the prediction of solid-liquid mass transfer in systems in with particles of various densities and sizes are available [15,[17][18][19]. The results achieved in developing the Becher process could be very useful to investigations regarding processes in Fe 0 walls.…”

Section: Discussionmentioning

confidence: 95%

“…Similar to the Becher process, this involves both Fe 0 and Fe II oxidation by relevant dissolved species (including contaminants and oxygen). Several different types of models have been developed with regards to the Becher process [17,18]. These models consider various aspects of the operation such as O 2 mass transfer and the presence of solid, liquid and gaseous phases.…”

Section: Processmentioning

confidence: 99%

“…These models consider various aspects of the operation such as O 2 mass transfer and the presence of solid, liquid and gaseous phases. For example, the model developed by Geetha and Surender [18] considered the Becher process as a multi-phase system involving a complex interplay between mass transfer and chemical reactions. This model can be further developed to meet the specifics of remediation Fe 0 /H 2 O systems.…”

Section: Processmentioning

confidence: 99%

“…Aqueous iron oxidation (corrosion) by dissolved oxygen (O 2 ) has been extensively described in the literature, including the aeration step in the Becher process for the manufacture of synthetic rutile [14,15,18,19,22]. The overall reaction can be represented as:…”

Section: Mechanism Of Iron Removal In the Becher Processmentioning

confidence: 99%

“…The Becher process is an environmentally friendly, cost-effective extraction method for upgrading ilmenite from 55% TiO 2 to about 94% TiO 2 by reduction with charcoal [14][15][16][17][18][19][20][21][22]. A typical feed made up of 55% ilmenite (FeTiO 3 ), 38% pseudorutile (Fe 2 Ti 3 O 9 ) and 7% rutile (TiO 2 ) is heated in air at about 1000 • C to oxidise the Fe II in the ilmenite to Fe III resulting in a phase known as pseudobrookite (Fe 2 TiO 5 = Fe 2 O 3 + TiO 2 ).…”

Section: The Becher Processmentioning

confidence: 99%

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Metallic iron for environmental remediation: Learning from the Becher process

Noubactep¹

2009

Journal of Hazardous Materials

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Metallic iron (Fe(0)) is a moderately reducing agent that has been reported to be capable of reducing many environmental contaminants. Reduction by Fe(0) used for environmental remediation is a well-known process to organic chemists, corrosion scientists and hydrometallurgists. However, considering Fe(0) as a reducing agent for contaminants has faced considerable scepticism because of the universal role of oxide layers on Fe(0) in the process of electron transfer at the Fe(0)/oxide/water interface. This communication shows how progress achieved in developing the Becher process in hydrometallurgy could accelerate the comprehension of processes in Fe(0)/H(2)O systems for environmental remediation. The Becher process is an industrial process for the manufacture of synthetic rutile (TiO(2)) by selectively removing metallic iron (Fe(0)) from reduced ilmenite (RI). This process involves an aqueous oxygen leaching step at near neutral pH. Oxygen leaching suffers from serious limitations imposed by limited mass transport rates of dissolved oxygen across the matrix of iron oxides from initial Fe(0) oxidation. In a Fe(0)/H(2)O system pre-formed oxide layers similarly act as physical barrier limiting the transport of dissolved species (including contaminants and O(2)) to the Fe(0)/H(2)O interface. Instead of this universal role of oxide layers on Fe(0), improper conceptual models have been developed to rationalize electron transfer mechanisms at the Fe(0)/oxide/water interface.

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Section: Discussionmentioning

confidence: 95%

Section: Processmentioning

confidence: 99%

Section: Processmentioning

confidence: 99%