The drum granulator has a large processing capacity and good sanitary conditions, and is not affected by weather and wind and rain, as shown in Figure 1.
Figure 1 Roller granulator
The length-to-diameter ratio of this type of equipment is generally 3.5:1, and the number of drum rotations is usually 5-7, which is adjusted by the variable speed drive. The drum tends to be inclined from the feeding end to the discharge end, and the angle is 2° to 5°. There are multiple baffles in the length of the inner edge to increase the mixing function of the material. A squeegee is additionally provided in the cylinder to remove the material sticking to the wall of the cylinder. The liquid spraying device can be divided into multiple places as needed, or can be installed in the middle. . A higher baffle is provided at the discharge end to ensure equalization of the discharge. The function of the drum granulator is superior to other types of granulation equipment because of its large capacity, which eliminates the adverse effects of changes in the moisture and ore supply speed of the ore material. The disadvantage is that the floor space is large and the investment is high. This equipment should be used for large heap leaching fields, and for small heap immersion fields below 10,000 tons, it is advisable to use a disc granulator.
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