Abstract
The Band-e Narges deposit is located about 70 km northeast of the city of Badrud, northern Isfahan province. Band-E Narges ore deposit is mining for magnetite. To release valuable minerals, crushing and grinding implemented for separation ore from the gangue. Magnetic separation and flotation methods for upgrading magnetite iron ore were carried out in different experimental conditions with varied parameters. The particle size of the initial content was 74 microns for flotation, and 150 microns for magnetic separation. The initial samples, with the iron grade of 43.4% and sulfur of 1.9%, are individually subjected to upgrading by floatation and magnetic separation during which the affecting parameters for each method were optimized. The improvement in the optimal condition for magnetic separation culminated in 60.85% for the iron grade, 85.21% iron for recovery and 1.08% for sulfur content. The upgrading by floatation in the optimal mode produced 60.02% iron grade, 80.41% iron recovery and 0.95% sulfur content. To determine the best method for the pre-concentration stage of ore, the content gained from each technique passed reclining for grad improvement. The final content obtained from the magnetic separation of was undergone the floatation test yielded to a content with 64.3% iron grade, 77.15% iron recovery and 0.7% sulfur content. The use of magnetic separation as a pre-concentration stage for floatation method is proposed as an economical method for improving the grade of the iron and reduce the sulfur content and to avoid the high cost of grinding, which is costly part of processing procedures.
Highlights
Methods available for upgrading iron or aree physical, physicochemical or chemical methods, amongst which the physical methods are the most cost effective (Rezaei, 1999)
The concentrate was subjected to magnetic separation
Because floatation is performed only on particles of less than 74 micron, magnetic separation could only be performed on particles of that size
Summary
Methods available for upgrading iron or aree physical (magnetic), physicochemical (floatation) or chemical methods, amongst which the physical methods are the most cost effective (Rezaei, 1999). Testing was conducted for different sizes and intensities to determine the parameters affecting magnetic and floatation separation. Because the samples tested in this study were identified to be magnetite, a magnetic separation technique was used to upgrade it as the most cost-and time-efficient method. It was concluded that the optimal DoF for this ore occurred at a mesh size of +150, better grades of fractions were produced at +200 and +230 These latter sizes required more grinding and more expense the grades obtained at +150, +200 and +230 did not differ significantly. In order to increase the grade, the concentrate obtained from the magnetic separation of particles 0 to 150 micron in size with a magnetic field intensity of 2000 Gauss was run through two more magnetic separation stages.
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