iron oxide

Separation and mapping of alteration zones is of special importance in the exploration of porphyry copper types. In order to highlight these alteration zones, remote sensing techniques have been applied. Zafarghand region is located in the southeast of Ardestan and northeast of Isfahan. Based on the division of geological structural zones, it is located in the Central Iran zone and also in the middle part of Urmia-Dokhtar magmatic volcanic arc. In this area, there are different alteration halos, including phyllic, potassic, propylitic, argillic, and slightly siliceous. In this study, argillic, phyllic, propylitic, and clay alterations have been identified using ASTER sensor images. Moreover, LANDSAT 8 images have been employed to identify clay and iron oxide alterations. In this regard, after performing the necessary pre-processing, methods of False Color Combination (FCC), Band Ratio (BR), Least Squares-Fit (LS-Fit), Matched Filtering (MF), and Principal Combination Analysis (PCA) were applied to reveal the zones containing these alterations. Among the applied methods, the LS-Fit and MF in Aster images, as well as the BR method in both images, and the PCA method in Landsat 8 have brought good results.

In this paper, the removal of iron oxide (Fe2O3) through scrubbing process has been investigated which applying in the glass industrial. The iron oxide was obtained from silica sand samples of Cheshun mine. Chemical elements were analyzed by Atomic Absorption Spectroscopy (AAS). Scrubbing by sulphuric acid was applied in order to remove iron oxide from silica sand. In addition, the study of parameters affecting the process was carried out through designing experiments by Taguchi method in Minitab. The AAS results showed 96.23% of SiO2, 0.13% Fe2O3, and 1.67% Al2O3. Mineralogical studies of silica sand showed that there have been hematite, goethite, and limonite which are the most important iron oxide minerals. The results of scrubbing indicated that the iron removal has increased by decreasing pH from 2 to 1. Also, the amount of iron in silica sand reduced by increasing the solid content from 50% to 70% and temperature degree from 400 to 800. The highest iron removal rate was obtained under the optimum condition including pH=1, temperature degree=80C0, and the solid content of 70%. Therefore, the final processed sample contained 0.031% iron oxide (Fe2O3) which is suitable for producing cup glass, glassware, and borosilicate crystal.