Abstract
The sodium leaching ratio (ηN) of ferric bauxite direct reduction process is much lower than that of ordinary bauxite; thus, the former consumes more sodium than the latter. ηN can be promoted by increasing the dosage of sodium or restricted by increasing the heating temperature and time. However, the restriction effect of heating temperature is 16.67 times larger than that of heating time, and the restriction effect decreases 47.03 times faster when heating temperature increases than that process of heating time. These imply that ηN improves with the increasing sodium carbonate dosage and the decreasing heating temperature.
Highlights
Ferric bauxite is a typical refractory bauxite which has a wide distribution in Asia [1,2,3] and Africa [1], it is improperly developed
Coal dosage, heating temperature, heatingdirect time,reduction and sodium carbonate dosage the four them, coal dosage is usually determined by the hematite content of ore, and can hardly be changed significant factors that influence ferric bauxite direct reduction and leaching process [14]
Only the effects of heating temperature, heating time, and sodium carbonate them, coal dosage is usually determined by the hematite content of ore, and can hardly be changed to dosage on ηN were measured in this research, and every experiment was conducted under a promote η N
Summary
Ferric bauxite is a typical refractory bauxite which has a wide distribution in Asia [1,2,3] and Africa [1], it is improperly developed. By adopting this technology, hematite and goethite in ferric bauxite are reduced to granular iron in a carbothermic reduction process, and iron powder is separated from the sinter produced after the reduction. Simultaneous with hematite and goethite reduction, the additive of sodium carbonate reacted with diaspore and boehmite generates water-soluble sodium aluminate, which is separated from the solution obtained after leaching and utilized for alumina production. Before reduction, iron-containing minerals react with sodium carbonate to generate evaporable sodium ferrite, and silicon-containing minerals react with sodium carbonate to generate nepheline [12,14]. These reactions reduce sodium leaching ratio and increase alkali consumption. The results of this study may be Minerals 2017, 7, 10; doi:10.3390/min7010010 www.mdpi.com/journal/minerals
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