| Abstrakt: |
The quality of bauxite resources in China is deteriorating, and the high-grade bauxite resources are depleting day by day, the resource problem has become an important problem for the development of China's aluminum industry, and the high sulfur and high iron bauxite, which has not yet been exploded on an industrial scale, belongs to the difficult-to-use resources, and it has a huge potential industrial value, and it is of great theoretical and practical significance to carry out the basic research on desulfurization and removal of iron from high sulfur and high Hon bauxite. For the comprehensive development and utilization of high sulfur and high iron bauxite in Guangxi, a systematic test of desulfurization and Hon removal from bauxite was carried out by using the process of "suspension oxidation roasting-reduction roasting-magnetic separation", and the transformation of mineral phases in the roasting process was studied by using the methods of X-ray diffraction analysis (XRD), chemical phase analysis, and X-ray photoelectron spectroscopy (XPS), etc. The test was carried out on the basis of "suspension oxidation roasting-reduction roasting-magnetic separation" . The results showed that the main sulfur containing and iron-containing mineral is pyrite, the process of "suspension oxidation roasting-reduction roasting-magnetic separation" can simultaneously realize the efficient removal of sulfur and the enrichment and separation of Hon. Under the conditions of suspension oxidation roasting with roasting temperature 700 °C, roasting time 40 min, O2 concentration 40%, and the total gas volume 600 mL/min, an oxidized roasting product with S, of 0.396% and desulfurization rate of 98.10% can be obtained. Suspension reduction roasting was then carried out under the conditions of roasting temperature 550 °C, roasting time 20 min, CO concentration 20%, total gas volume 600 mL/min, and magnetic Held strength 150 kA/m, which resulted in an iron ore concentrate with TFe grade of 54.79% and aluminum-rich ore with St of 0.248%, TFe grade of 4.37% and Al2O3 content of 75.27%. This technology substantially increases the Al2O3 content of high sulfur high iron bauxite, which is conductive to the subsequent dissolution of bauxite and achieves the technical goal of desulfurization and removal of iron to raise aluminum content. This process provides a new technical way for the efficient utilization of this kind of difficult--to-process to select high sulfur high iron bauxite resources. [ABSTRACT FROM AUTHOR] |
