When some light products enter the second cyclone with the underflow, they eventually become Chinese coal products, thus affecting the recovery rate of clean coal products. The first stage of the three-product heavy medium cyclone uses a cylindrical heavy medium cyclone, because the internal flow field of the cylindrical heavy medium cyclone is more stable and uniform than the cylindrical conical heavy medium cyclone ( See), therefore, the sorting accuracy of the cylindrical heavy medium cyclone is higher than that of the cylindrical conical heavy medium cyclone, and the sorting effect of one cyclone determines the quality and yield of the clean coal product. Two-stage sorting precision of two-stage two-product heavy medium cyclone (a) Density field density distribution of suspensions in two cyclones with a feed conical cyclone suspension feed density of 1.4kg/L Schematic (2) Separation density adjustment flexibility Three-product heavy medium cyclone The second stage feed suspension comes from the underflow of a cyclone, and its feed pressure and density are not as easy as two-stage two-product heavy medium cyclone Control, causing the sorting density of the second stage cyclone to change with the density of the first stage, thereby affecting the medium coal and strontium lime fraction. However, for a coal preparation plant that is uncertain about the purchase of raw coal and has a large change in coal selectivity and sorting density, it is easier to adjust the density of the two-stage suspension of the two products than to adjust the local structural parameters of the three-product heavy medium cyclone. When the sorting density requirement is relatively high, when the two products are out, the three-product heavy medium cyclone combines the clean coal and the medium coal into the clean coal product, so that the low-density medium suspension can be used for high-density sorting. Reduce the consumption and power consumption.
(3) The medium circulation amount, feed pressure and over-grinding property adopt two-stage two-product heavy medium cyclone main and re-washing sorting process, which requires two sets of suspension systems, which are complicated in system and many process links, resulting in high investment. The production cost is high, the production links increase, and equipment accidents increase.
The three-product heavy medium cyclone is used to sort out three kinds of products: fine, medium and sin. The system is simple and the process is few. At the same throughput, the media circulation and feed pressure of the three-product heavy medium cyclone are close to the two-stage two-product heavy medium cyclone. The two-stage two-product heavy medium cyclone main and re-washing sorting process is adopted. After the main washing system is selected, the medium coal needs to be pumped into the rewashing system through the intermediate de-intermediation, which increases the pumping and piping of the pump. Transportation, which causes the re-smashing and muddy phenomenon of the middle and the shovel, reduces the actual recovery rate of the medium coal, and imposes a burden on the subsequent operation of the slime water.
(4) System flexibility The two-stage two-product heavy medium cyclone separation process is mainly flexible and re-selected. When it is not necessary to produce three kinds of products: clean coal, medium coal and vermiculite, only two kinds of products, namely clean coal and vermiculite, are produced. The two-product heavy medium cyclone can only run the main selection system and does not run the reselection system.
3 Conclusion The three-product heavy medium cyclone process is a coal preparation method that uses three sets of media systems to sort out three products. The advantage is that the process system is simple, and three products that meet the requirements can be obtained through sub-sorting. low. The two-stage two-product sorting process uses two two-product heavy medium cyclones for secondary sorting to obtain three products that meet the requirements. The feature is that the process system is flexible, and in some cases, only one cyclone can be opened. in production. The scientific and rational coal preparation process should aim at the product structure, based on the main raw coal quality data, and use reasonable capital investment to achieve the goal of minimum production cost and high-purity coal recovery rate.
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