In terms of the beneficiation process, re-election is the easiest method. The materials to be re-selected are relatively coarse, the particle size range is relatively wide, and different granular materials require different equipment; the operating factors for re-election are relatively simple. For various sorting equipment, the specific gravity composition and particle size of the selected raw materials are basically the same, and the selection conditions are basically the same. The re-election processing volume is large, the equipment is simple, the operation is easy, the investment is small, and the process flow is relatively simple. It also has certain adaptability to various types of pyrite cinder.
Determination process according mineralogy specific gravity, it is understood, pyrite cinder main mineral ore specific gravity of 3.783 ~ 3.973. While the proportion of quartz is 2.65, a specific gravity of 2.7 calcite, feldspar 2.5 to 2.6, 1.7 borax, carnallite 1.6, 1.5, etc. as Glauber's salt. According to the following calculation formula, the difficulty of re-election separation of different specific gravity minerals can be roughly judged by equal reduction ratio:
Where: δ 1 - the specific gravity of the light mineral;
δ 2 - the specific gravity of heavy minerals;
â–³ - Sort the specific gravity of the medium.
Although the main iron mineral in the pyrite cinder is not much different from the density of the gangue mineral quartz, it can still be selected by re-election. The slag is sieved through a 100 mesh sieve, and the sieve is ground for 3 minutes. The shaker and the spiral chute are used for a single beneficiation test. The test results are shown in the table.
Table Shaker, spiral chute single ore dressing test
Mineral processing method | Concentrate grade | Yield(%) | Tailings grade | Concentrate recovery rate of Fe (%) | S content |
Shaker | 63.16 | 19.85 | 47.76 | 24.67 | 0.272 |
Spiral chute | 60.23 | 56.68 | 38.50 | 67.18 | 0.296 |
It can be seen from the table that the effect of the trial shaker is not good. Although the grade can reach 63.16%, the yield and concentrate recovery rate are both low, only 19.85% and 24.67% respectively. The spiral chute is used to treat the slag, which can be directly used to sort the pyrite cinder. After one sorting, iron concentrate with a concentrate grade of 60% or more can be obtained, and the recovery rate is also 67.18%, and the sulfur content has dropped to about 0.3%.
A single shaker process does not achieve a good sorting index. However, the use of a shaker and a spiral chute has the advantages of large processing capacity, simple process and simple operation. In view of the feasibility of industrial applications in the future, in order to reduce investment costs and improve economic efficiency, equipment with large processing capacity should be selected. Therefore, in order to achieve better selection criteria, the re-election process is suitable for processing with the magnetic separation joint process. Pyrite cinder.
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