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Thursday, November 12, 2020 | History

2 edition of Characterization and dissolution of scale formed during continuous pressure acid leaching of laterites. found in the catalog.

Characterization and dissolution of scale formed during continuous pressure acid leaching of laterites.

Jimmy Kambossos

Characterization and dissolution of scale formed during continuous pressure acid leaching of laterites.

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Published .
Written in English


About the Edition

The focus of this work was the study of scale produced as a by-product from the Falconbridge laterite pressure acid leaching campaigns conducted during the period 2000 to 2002. The objective was twofold: (i) scale characterization, (ii) scale dissolution.The results obtained from the scale characterization studies revealed that alunite formed in fresh water and saline water had the general chemical formula of (H3O)Al3(SO4)2(OH) 6 (hydronium alunite) and NaAl2Fe(SO4)2(OH) 6 (sodium alunite), respectively. In saline water campaigns, Fe substitutes Al within the alunite structure---compared to that of pure hydronium alunite---at an average Al:Fe molar ratio of 2:1. Alunite comprises 67 wt% of the scale mass with hematite, making up the balance.The scale dissolution tests examined the effectiveness of chemicals dissolving scale as a measure of descaling. Two scales were tested, I3 and I6. Maximum dissolution was attained with HCl, instead of H2SO 4 at the most vigorous conditions of 200°C and 0.5m. Also, the dissolution kinetics of I3 were twice as fast as those of I6 due to the five-fold porosity of the former scale.The scale growth rates were found to be highest at the compartment of acid addition. Those obtained from the saline water campaigns were 200% greater than fresh water campaigns.

The Physical Object
Pagination141 leaves.
Number of Pages141
ID Numbers
Open LibraryOL20238877M
ISBN 10049402450X


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Characterization and dissolution of scale formed during continuous pressure acid leaching of laterites. by Jimmy Kambossos Download PDF EPUB FB2