Fumes in Aluminum Smelting: Chemistry of Evolution and Recovery

Cochran, C. Norman; Sleppy, W. C.; Frank, W.

doi:10.1007/bf03355663

Cited by 10 publications

(5 citation statements)

References 3 publications

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“…2 Many researchers have studied the effects of physical and chemical properties of alumina on the adsorption capacity for gaseous HF and solid dust. Several mechanisms of HF adsorption have been proposed to reconcile the results of XRD, XPS, NMR, TGA, and DSC and so on.…”

Section: Introductionmentioning

confidence: 99%

Fluoride Desorption of Secondary Alumina at High Temperatures

Yang

Gao

et al. 2013

Electrochemistry

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Primary alumina is used as the raw material as well as the sorbent for fluoride in aluminum electrolysis. Secondary alumina is the product of primary alumina after absorbing fluoride in exhaust pot gas. The fluorine and mass loss during heating secondary alumina was measured to study the fluoride desorption process of alumina. It was found that during the heating of secondary alumina, HF emission was always combined with H 2 O escape at approximately 740°C or below. 47% fluorine in secondary alumina desorbed in the form of HF at 30-740°C, while the rest 53% desorbed in the form of chiolite at 740-1100°C.

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Section: Introductionmentioning

confidence: 99%

Fluoride Desorption of Secondary Alumina at High Temperatures

Yang

Gao

et al. 2013

Electrochemistry

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“…Other researchers [11][12][13] have instead concentrated their efforts on determining the nature of the chemical equilibrium between gaseous and adsorbed HF Figure 1. A laboratory-scale HF adsorption rig.…”

Section: Irreversible Hf Adsorption In the Dry-scrubbing Processmentioning

confidence: 99%

“…Various researchers [11][12][13] have utilized such reactors with synthetic or real pot gas and have reported data that are suggestive of a favorable isotherm. Under the isotherm classification system of Brunauer et al, 19 the reported isotherms appear to be best categorized as Type-1, thereby implying a reversible reaction.…”

Section: Determining the Adsorption Isotherm For Hf On Aluminamentioning

confidence: 99%

Irreversible HF adsorption in the dry-scrubbing process

Gillespie¹,

Hyland

Metson

1999

JOM

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“…The modified sandy alumina commonly produced within the Alcoa system has been found to sorb up to 1.8 weight percent of HF with efficiency above 99%. 1 Other aluminas have recently been found to sorb higher quantities. From this, it can readily be deduced that the amount of alumina required to sorb all of the HF in pot fume is a function of the alumina characteristics and of the evolution rate of HF from the pot cell (see Figure 2).…”

Section: Applicability and Limitationmentioning

confidence: 99%