ASSESSMENT OF IRON ORE MINING GANGUES FOR SECONDARY RECOVERY OF OTHER METAL VALUES

ASSESSMENT OF IRON ORE MINING GANGUES FOR SECONDARY RECOVERY OF OTHER METAL VALUES


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ASSESSMENT OF IRON ORE MINING GANGUES FOR SECONDARY RECOVERY OF OTHER METAL VALUES

PROJECT TOPICS AND MATERIALS ON ASSESSMENT OF IRON ORE MINING GANGUES FOR SECONDARY RECOVERY OF OTHER METAL VALUES


ABSTRACT

Due to rapid industrialization, the demand for heavy metals is ever increasing, but the reserves of high-grade ores are diminishing. Therefore there is a need to explore alternative sources of heavy metals. Ore mine gangues which are industrial wastes can act as potential sources of industrial materials. Typical iron ore minerals may contain antimony, arsenic, beryllium, cadmium, chromium, copper, lead, nickel, as well as silver and zinc [6]. The economic viability of these metals would depend on their various amounts in the iron ore. The analysis of the Itakpe iron ore in Nigeria would determine whether the associated metals are commercially feasible for secondary recovery. Due to these afore mentioned problems, the research was carried out using EDX - XRF and XRD, analyzing five different samples which include coarse iron ore, middle fine iron ore, fine iron ore, gangue iron ore and concentrate iron ore. The sample analysis shows that Itakpe iron ore is hematite-rich with atomic % of Fe to be 40.00 and weight % to be 69.94.

The EDX results showed the presence of iron peak of varying intensity which was observed to have the concentrate with the highest peak of 37500 and the gangue with the least peak of 11200. Also, the presence of silicon peak of varying intensity was observed with the gangue having the highest intensity of 7000 while the concentrated iron ore and coarse iron ore has a negligible intensity. The varying intensity of cobalt in the 5 sample cannot be neglected as the concentrate iron ore has the highest intensity of 5000 and the gangue has the lowest intensity of 1500.

The XRF was used for the elemental analyses which showed high percentage of iron element ranging from 34.60% for GIO, 51.59% for MfIO, 53.80% for FIO, 56.34% for CIO, and 64.51% for CoIO. Also, the samples contain some percentage of Silica ranging from 0.36% for CIO, 1.63% for CoIO, 11.60% for FIO, 12.53% for MfIO and 22.97% for GIO. This really shows that the iron and the silicon can still be recovered from the gangue.

Also, the XRD was used for the structural analysis of the unprocessed iron ore, middle fine iron ore, concentrate iron ore and the gangue iron ore samples in which the spectral of the unprocessed iron ore was observed to have many peaks when compared with the spectrum of other samples, this is attributed to high concentration of impurities.


CHAPTER ONE

1.0 INTRODUCTION

1.1 Overview

Iron constitutes about 5% of the Earth’s crust, making it the fourth most abundant element. Iron oxides and hydroxides form the principal iron ore minerals, due to their high iron content and occurrence as large tonnage surface deposits [1]. The presence of the amount of iron varies from an average of 2-3% in sedimentary rocks to 8.5% in the basalt and gabbro [5]. Iron is, however, present in low concentration in most parts of the earth, thus a deposit must have a high percentage of the metal to be considered ore grade for economic purposes. Typically, a deposit must contain at least 25% iron to be considered economically recoverable. Exploitation of large, low grade iron ore deposits can be achieved through concentration of the iron.

The iron itself is usually found in the minerals of magnetite (Fe3O4), hematite (Fe2O3), goethite (FeO(OH)) or limonite (FeO(OH)n(H2O)), siderite (FeCO3), chamosite (Mg,Fe,Al)6(Si,Al)414(OH)8, ilmenite (FeTiO3) and pyrite (FeS). Despite the existence of iron in many minerals, five of them are the primary sources of iron: magnetite (Fe3O4), hematite (Fe2O3), goethite/limonite (FeO(OH)), siderite (FeCO3), and pyrite (FeS) [5].

Iron ores are rocks and minerals from which metallic iron can be extracted. An iron ore deposit is a mineral body of sufficient size, iron content, and chemical composition with physical and economic characteristic that will allow it to be a source of iron either immediately or potentially [2]. Iron ore is the raw material used to make pig iron, which is one of the main raw materials to make steel. Nearly 98% of the mined iron ore is used to make steel [3]. There are four main types of iron ore deposits worked currently, depending on the mineralogy and geology of the ore deposits. These are magnetite, titanomagnetite, massive hematite, and pisolitic ironstone deposits [2].

The Itakpe iron ore deposit in Nigeria which has a total estimated reserve of about 182.5 million metric tonnes consists mainly of quartzite with magnetite and hematite [6].

The deposit has been developed to supply iron ore concentrates to Ajaokuta steel plant and the Delta steel plant, Aladja, in Nigeria.

The Itakpe Iron deposit is important for the successful development of iron and steel industry in Nigeria though on the national scale there are other silico-ferruginous formations which are interesting from commercial and economic viewpoint especially the deposits of Ajabonoko Hill and Choko-Choko which are said to be similar to those at Itakpe. To be taken seriously also is the revenue loss due to the uncovered minerals in Itakpe iron ore gangue.

The extraction of specific value minerals from their naturally occurring ores is variously termed “ore dressing,” “mineral dressing,” and “mineral beneficiation.” For most metalliferous ores produced by mining operations, this extraction process is an important intermediate step in the transformation of natural ore to pure metal. Although a few mined ores contain sufficient metal concentrations to require no beneficiation (e.g. some iron ores), most contain relatively small amount of the valuable metal, from perhaps a few percent in the case of base metals which are commonly intergrown with economically important and unimportant (gangue) minerals on a microscopic scale in the iron ore gangue.

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The extraction of specific value minerals from their naturally occurring ores is variously termed “ore dressing,” “mineral dressing,” and “mineral beneficiation.” For most metalliferous ores produced by mining operations, this extraction process is an important intermediate step in the transformation of natural ore to pure metal. Although a few mined ores contain sufficient metal concentrations to require no beneficiation (e.g. some iron ores), most contain relatively small amount of the valuable metal, from perhaps a few percent in the case of base metals which are commonly intergrown with economically important and unimportant (gangue) minerals on a microscopic scale in the iron ore gangue... physical science project topics

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