TISCO mining companies Ekou iron ore processing plant put into operation in 1978, the original use of weak magnetic separation process principles Sec three sections of stage grinding, 2000 - The 2002 transformed into a grinding period of four low intensity magnetic separation stage three sections of magnetic reconnection The principle principle process is selected, in which the magnetic weight sorting device adopts a gravity magnetic agglomeration machine. After the transformation, the ore dressing plant is divided into two systems, “321†and “221†according to the ball mill configuration plan. The specific process structure of the “321†system is relatively simple, and the processing capacity is large, but the concentrate grade is generally lower than 65.5%; the specific process structure of the “221†system is relatively complicated, and the concentrate grade can reach 67%, but the yield is low. In 2007, the production capacity of the iron ore mine with an annual production capacity of 2 million tons of iron concentrate powder was included in the schedule, and the total concentrate grade of the ore dressing plant was required to reach 67% or more after the expansion. In this way, under the premise of not allowing the flotation process to be considered, how to make the "321" system with large processing volume still use the original gravity magnetic agglomeration machine as the switching device for the concentrate grade, it will be difficult to achieve the desired target. To this end, the Yankou Iron Ore Concentrator introduced a new magnetic separation column magnetic separation column in the "321" system for production considerations. The results show that the magnetic separation column selection effect is satisfactory. First, the gravity magnetic agglomeration machine problem The position of the gravity magnetic agglomeration machine in the "321" system of the concentrator is shown in Figure 1.
Figure 1 Location of the gravity magnetic agglomerator in the "321" system
It can be seen from Fig. 1 that the gravity magnetic agglomeration machine is at the end of the process, and the slime and lean organisms contained in the weak magnetic separation concentrate should be removed to ensure the final high-grade iron concentrate. However, the actual production shows that the gravity magnetic agglomeration machine has insufficient depth of magnetic field due to the large selection area, weak magnetic field strength and non-adjustability, which limits the elution effect of rising water on minerals, and the improvement of concentrate grade is limited. It is manifested in two aspects: First, when the rising water velocity is small, large particles of gangue minerals and lean organisms will enter the concentrate, and it is impossible to clean the fine-grained gangue minerals attached to the surface of the magnetic mineral particles, so it cannot be exported. The concentrate is higher than 67%; the second is that when the rising water velocity is large, the slurry in the selected area is in a turbulent state, and it is difficult to form a stable sorting effect, so it is impossible to select a high-grade concentrate and a small agglomeration. Experience is washed into the tailings by rising water, causing the tailings grade to be too high. The particle size analysis results of the gravity magnetic agglomerator products in the "321" system at two rising water speeds are shown in Table 1 and Table 2. Table 1 Results of particle size analysis of gravity magnetic agglomerator products at small ascending water velocity
| product | Size/mm | Yield/% | grade/% |
| Concentrate | +0.074 | 4.50 | 35.80 |
| -0.074+0.055 | 4.80 | 48.80 |
| -0.055+0.045 | 22.60 | 60.50 |
| -0.045 | 68.10 | 66.30 |
| total | 100.00 | 62.78 |
| Tailings | +0.074 | 4.60 | 14.90 |
| -0.074+0.055 | 5.80 | 16.40 |
| -0.055+0.045 | 23.10 | 22.90 |
| -0.045 | 66.50 | 27.90 |
| total | 100.00 | 25.48 |
Table 2 Results of particle size analysis of gravity magnetic agglomerator products under large rising water velocity
| product | Size/mm | Yield/% | grade/% |
| Concentrate | +0.074 | 2.60 | 29.40 |
| -0.074+0.055 | 4.50 | 47.80 |
| -0.055+0.045 | 25.60 | 61.00 |
| -0.045 | 66.90 | 66.90 |
| total | 100.00 | 63.54 |
| Tailings | +0.074 | 3.00 | 16.90 |
| -0.074+0.055 | 4.40 | 22.70 |
| -0.055+0.045 | 23.60 | 35.30 |
| -0.045 | 69.00 | 51.20 |
| total | 100.00 | 45.16 |
Table 1 and Table 2 show that the concentrate grade and tailing grade are low when the water velocity rises slightly; the slime and fine grain lean organisms in the concentrate are not completely removed, and the granules are removed very little. . When the water velocity increases, the grade of concentrate increases, but at the same time, the grade of tailings increases more; the grade of -0.045mm grade has no significant change compared with the rate of small ascending water, while the grade of -0.045mm The ore grade increased by 23.30 percentage points compared with the large rising water velocity, reaching 51.20%, indicating that the fine-grained rich ore with higher monomer dissociation entered the tailings. Second, the application of magnetic separation column magnetic separation column and gravity magnetic agglomeration machine are both magnetic
re-election equipment , but the magnetic separation column overcomes the shortcomings of gravity magnetic agglomeration machine, there is enough magnetic force to bring together magnetic iron minerals, speed up The rate of decline of the magnetic minerals, as well as sufficient rising hydraulic power to float the non-magnetic and weak magnetic iron minerals, the lower feed water is beneficial to prolong the elution time of the minerals, and the rising water forms a stable state before entering the sorting area. The ascending water layer is beneficial to produce a stable sorting effect in the sorting area, and eliminate the mixing of gangue minerals in the magnetic mineral caused by turbulence. In addition, the magnetic separation column also has a plurality of cyclic reciprocating effects of agglomerating-dispersing-re-agglomerating the magnetic particles, so that the rising water can fully separate the slime, gangue minerals and lean organisms trapped in the agglomerate; the upper design the fixed magnetic field is not timely can be enriched with the living body is formed aggregates and fine magnetic minerals already prevent dissociated monomers sorting area, to ensure improved
metal recovery. In view of the difficulty in the gravity magnetic agglomeration machine in the “321†system, the concentrate grade is more than 67%. In order to meet the needs of the expansion project of 2 million t/a iron concentrate powder, the Yankou Iron Ore Concentrator went down in 2007. In the year of the "321" system, a magnetic separation column was installed, and the practicality of the production was investigated. The comparison of the production indexes of the magnetic separation column and the gravity magnetic agglomeration machine is shown in Table 3. The particle size analysis results of the magnetic separation column products are shown in Table 4. Table 3 Comparison of production indexes between magnetic separation column and gravity magnetic agglomeration machine
| Magnetic reselection equipment | Giving grade | Concentrate grade | Tailings grade |
| Magnetic column | 60.56 | 67.43 | 34.49 |
| Gravity magnetic agglomeration machine | 60.53 | 65.00 | 36.74 |
Table 4 Results of particle size analysis of magnetic separation column products
| product | Size/mm | Yield/% | grade/% |
| Concentrate | +0.074 | 2.40 | 34.90 |
| -0.074+0.055 | 2.80 | 52.20 |
| -0.055+0.045 | 21.40 | 64.40 |
| -0.045 | 73.40 | 69.90 |
| total | 100.00 | 67.39 |
| Tailings | +0.074 | 8.80 | 14.80 |
| -0.074+0.055 | 4.20 | 17.80 |
| -0.055+0.045 | 31.60 | 31.60 |
| -0.045 | 55.40 | 45.40 |
| total | 100.00 | 37.19 |
| Feed mine | +0.074 | 4.20 | 26.60 |
| -0.074+0.055 | 2.40 | 39.90 |
| -0.055+0.045 | 23.00 | 56.80 |
| -0.045 | 70.40 | 64.10 |
| total | 100.00 | 60.27 |
As can be seen from Table 3, the concentrate grade of the magnetic separation column reached 67.43%, which is 2.43 percentage points higher than that of the gravity magnetic agglomeration machine, and the tailings grade is 2.25 percentage points lower than that of the gravity magnetic agglomeration machine. It can be seen from Table 4 that the grades of the various grades in the magnetic separation column tailings are generally lower than the grades of the corresponding grades in the gravity magnetic agglomerator tailings under the large rising water velocity, especially the grade of -0.045 mm, which is 5.80 lower. percentage point. The results in Tables 3 and 4 show that the magnetic separation column not only can fully separate the slime, gangue minerals and lean organisms in the concentrate, but also can well prevent the enriched organisms and the monomer dissociated. Fine-grained magnetic minerals enter the tailings to achieve high recovery at high grades. In view of the excellent selection effect of the magnetic separation column, the equipment has completely replaced the gravity magnetic agglomeration machine in the “321†system of the Yankou Iron Ore Concentrator. The next step will be extended to the “221†system and the new system to be expanded. III. Conclusion The success of the magnetic separation column in the “321†system of the Yankou Iron Ore Concentrator has made it possible to produce high-grade iron concentrate powder in the Yankou Iron Mine without chemical pollution, and to simplify the “221†system process. The process has further laid a good foundation for further increasing production capacity and achieving the goal of producing 2 million tons of iron concentrate powder per year. However, the magnetic separation column also has the defects of large water consumption and low processing capacity of a single machine, which needs to be improved.
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