Abstract
The dissolution of iron oxide (Fe 2O 3) using sucrose as the reducing substance in sulphuric acid solutions is described. The experimental runs were carried out in homogeneous (reduction of Fe 3+ in solution) and heterogeneous (dissolution of Fe 3+ from iron oxide and its reduction) tests: in the former case, the influence of acid and sucrose concentrations in the reduction of Fe 3+ in solution was studied and several carbon sources were used. In the latter case, the influence of the main factors of dissolution of the iron from the mineral containing the iron oxide was studied; the factors investigated included acid and sucrose concentration, temperature and time of treatment. The results show how the presence of sucrose increases the iron extraction more than two-fold compared with the tests without sugar at the same acid concentration. This makes it possible to carry out a leaching process with a lower acid concentration. Full factorial design was used to plan the experimental work. The results show the potential application of this process in hydrometallurgical operations involving iron oxide dissolution (iron removal from industrial minerals, leaching of iron, etc.).
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