IRANIAN JOURNAL OF MINING ENGINEERING (IRJME)
Year:2016 | Volume:10 | Issue:29|Papers Count:10

Endmember detection in remote sensing is one of the significant factors to enhance the accuracy of spectral unmixing procedures. Because of highly mixed pixels in the case of mineral detection studies, the ordinary methods based on pure pixel occurrence assumption will not y of Hyperion data using the ORASIS method in Agh-Dagh region of Ardebil, Iran and a comparison sield accurate results in all situations. This research aimed to detect the endmembers on a scenetudy to Pixel Purity Index approach. ORASIS is a collection of a number of algorithms that work together to produce a set of endmembers that are not necessarily from inside the data set, and therefore, the pixel purity assumption is not vital for accurate results. Applying the consecutive algorithms of the ORASIS method on the Hyperion data of the study area has been generated 23 virtual endmembers. Spectral plots of these unknown endmebers were then compared to the USGS spectral library using SAM and SFF techniques; which resulted in recognition of ten minerals including Alunite, Kaolinite, Hornblende, Arsenopyrite, Vermiculite, Gypsum, Lepidolite, Chert, Limonite and Malachite, while the PPI method represented only 5 mineralogical compositions including Kaolinite/Smectite, Clinoptilolite, Celsian, Muscovite and Montmorillonite. Abundances maps of the detected minerals were generated by Linear Spectral Unmixing (LSU) technique for both ORASIS and PPI methods. The results of ORASIS showed much better and reasonable coincidence with the geological settings according to the available exploration reports and direct field observations in the study area.

This study has been done to determine the galvanic interaction between five types of grinding media (mild steel, ductile, 10% chromium, 20% chromium, and ceramic media) and galena in situ of the mill, and galena and pyrite in the flotation cell. The amount of Iron oxidation species derived from galvanic current between galena-pyrite and the grinding medium corrosion measured by EDTA extraction. It was found that the amount of pyrite increased in a mixture of galena and pyrite, galvanic interaction between two minerals increased. The study of EDTA extraction for galvanic interaction between galena-grinding media showed the ceramic media has a significantly not galvanic interaction with galena and high chromium media because of a significantly weaker galvanic interaction with galena has minimum corrosion than mild steel medium that has maximum corrosion. Iron oxidation species from corrosion of grinding media measured EDTA extraction, that amount of media corrosion for all grinding media are mild steel > cast iron > 10% chromium > 20% chromium > ceramic media.

Mine tailing dams may cause pollution or make various problems for the environment. Heavy metals play a major role in the destruction and degradation of natural habitat and have harmful effects on the human health. The first part of the current paper examines the factors affecting the transfer of heavy metals from a solid to the liquid phase. Performing leaching tests associated with reservoir revealed that only vanadium has a high concentration among the heavy metals, at such a high pH, and the maximum transfer to the aqueous phase occurs at pH=12 , temperature of 60oC , time of 8 hours, and the solid/liquid ratio of 1. In the second part of the paper, the parameters of the solution regarding the removal of vanadium are discussed. The maximum absorbance of vanadium by activated carbon takes place at pH=7, 6 hours, and the concentration of carbon is 0.6.

In each area, knowledge of linear structures consist of faults and fractures is useful for geological and hydrogeological studies and for exploration of mineral resources. Lineation map is usually extracted from spatial data such as satellite images and aerial photos. Although visual extracting is the popular method, user errors are highly reduced by automatic extraction methods. The best methods are the ones who combine edge enhancement filters and feature extraction algorithms. In this study, an algorithm is presented based on Gaussian kernel derivative operator as an edge enhancer and Radon transform as the linear shape extractor in a gridded image. This method was tested on a simple image with high level of noises which produced promising results. This was also implemented on a Landsat image (TM) from a sandstone plateau in northern state of Australia, an arial photo from southern Nevada and a manual photo from Mozaeic Canyon, California and its results compared with another method on the same database. Results show that this algorithm is lonely effective enough to detect lineation. These results, even with a very simple algorithm with low computation cost, are highly comparative with the results of a complicated method. It should be mentioned that this method produces discontinued results for continues lineation, but it is able to capture non-linear structures.

solvent extraction is one of the concentration and purification methods for uranium extraction from leach solution. The extraction of uranium from nitric acid solution was carried out by di-butyl carbitol (DBC). In this study, the effect of concentrations of both solvent and nitric acid, temperature and mixing time were investigated. Optimal conditions for the solvent extraction of uranium by DBC obtained under nitric acid concentration 30%, di-butyl carbitol concentration 60%, kerosene as diluent 40%, temperature 20°C and mixing time 4 minutes. In these conditions the maximum extraction of uranium was obtained %46.07 in one stage while in two stages was reached about 52%. In addition uranium extraction can be increased to 70% by three stages.