The aim of the work was to decrease the iron content of ferrous quartz sands by fixed-bed column leaching with recycling of the leaching solutions in order to attain a product suitable for industrial use. Dissolution of iron was achieved by treating the sands in an acid medium with a reducing agent (oxalic acid) to convert Fe-III into Fe-II. The factors assumed to affect dissolution of iron, Such as temperature, oxalic acid concentration, pH and flow-rate, were studied with a 2(4) full factorial design in order to assess the main effects and the interactions among the factors. Removal of 46.1% iron gives a product containing 0.0163% Fe2O3 which is fit for industrial applications.
Removal of iron from quartz sands: A study by column leaching using a complete factorial design / S., Ubaldini; Piga, Luigi; P., Fornari; R., Massidda. - In: HYDROMETALLURGY. - ISSN 0304-386X. - 40:3(1996), pp. 369-379. [10.1016/0304-386x(95)00012-6]
Removal of iron from quartz sands: A study by column leaching using a complete factorial design
PIGA, LUIGI;
1996
Abstract
The aim of the work was to decrease the iron content of ferrous quartz sands by fixed-bed column leaching with recycling of the leaching solutions in order to attain a product suitable for industrial use. Dissolution of iron was achieved by treating the sands in an acid medium with a reducing agent (oxalic acid) to convert Fe-III into Fe-II. The factors assumed to affect dissolution of iron, Such as temperature, oxalic acid concentration, pH and flow-rate, were studied with a 2(4) full factorial design in order to assess the main effects and the interactions among the factors. Removal of 46.1% iron gives a product containing 0.0163% Fe2O3 which is fit for industrial applications.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
