RESEARCH ON CONCENTRATION OF IRON ORE
SPC « «Aeromeh» Ltd. carried out semi-industrial trials on concentration of iron ores with the help of air separation on CAD machine.
Trials were carried out for material of 4 samples of iron ores that have been taken from different opencast mines. When selecting samples were guided by the value of the total iron content in the ore.
Brief characteristics of samples are shown in the Table 1.
Table 1. Characteristics of the studied iron ores
| Number of the opencast mine | Content Fetotal, % | Humidity, % |
| 1 | 51,73 | 8,0 |
| 2 | 56,09 | 2,5 |
| 3 | 55,69 | 11,3 |
| 4 | 58,87 | 7,5 |
Samples 1, 3 and 4 were previously dried to humidity 2,0 mas. %.
Before carrying out trials on concentration of ores all 4 samples were crushed in two phases. As a result from each sample were got 2 samples of the ore material with particle size 5-0 and 1-0 mm. Trials on concentration of ores with the help of air classification were carried out for both granulometric fractions of all 4 samples.
Trials on air separation were carried out in two phases.
During the first phase were determined possible qualitative indexes of separating trial samples with the help of air separation.
Results of trials on concentration of ore material with particle size 5-0 mm are shown in the Table 2.
Table 2. Results of air separation of iron ore samples with particle size 5-0 mm
| Number of the opencast mine | Content Fetota in the concentrate, % | Output of the concentrate, % |
| 1 | 56,38 | 53,0 |
| 2 | 60,54 | 57,7 |
| 3 | 60,34 | 37,2 |
| 4 | 61,12 | 53,7 |
Results of trials on concentration of ore material with particle size 1-0 mm are shown in the Table 3.
Table 3. Results of air separation of iron ore samples with particle size 1-0 mm
| Number of the opencast mine | Content Fetota in the concentrate, % | Output of the concentrate, % |
| 1 | 58,63 | 29,2 |
| 2 | 62,72 | 34,8 |
| 3 | 61,70 | 29,2 |
| 4 | 63,12 | 29,7 |
CONCLUSION:
1. There were carried out semi-industrial trials on concentration of 4 samples of iron ores with the help of air separation method. Size of particles in the initial material was 5-0 and 1-0 mm. Humidity of samples was about 2 mas. %. For concentration was used serial air separator CAD-4.
2. There were confirmed results of preliminary trails on possibility of using air separation for concentration of iron ores.
3. Concentrates with content of iron more than 60% were obtained from ores of 2, 3, 4 opencast mines.
4. From ore of 1 opencast mine were not obtained concentrates of the required quality in none of the samples due to predominance of lowiron gethylic component in the ore.
5. From material with particle size 5-0 mm were obtained concentrates with content of iron 60,34-61,12% with output 37,2-53,7%.
6. From material with particle size 1-0 mm were obtained concentrates with content of iron 61,70-63,12% with output 29,2-34,8%.
7. Received results allow to recommend air separator SPC “Aeromeh” Ltd. as a unit for concentration of iron ores.