A method for on-line adjustment of the second-stage separation density of a three-product dense medium cyclone

Abstract

The invention discloses a method capable of adjusting two-stage separation density of a three-product dense medium cyclone on line. The used devices in the method comprise the three-product dense medium cyclone, a clean-coal medium-releasing sieve bend, a clean-coal draining screen, a coal-slime qualified medium bucket, a coal-lime qualified medium pump and the like. According to method capable of adjusting two-stage separation density of the three-product dense medium cyclone on line, part heavy suspension solution with low dense medium density, fine granularity and high coal-slime content is shunted from overflow of a coal-slime dense medium cyclone, the heavy suspension solution enters into a raw-coal qualified medium bucket, and then the heavy suspension solution is thrown into the three-product dense medium cyclone through a raw-coal qualified medium pump for cycle use. The separation density, especially the separation density, of a two-stage cyclone is adjusted by adjusting the amount of shunt volume. When the washability characteristic of the raw coal is changed or a product structure needs to be adjusted, the method can provide a stable work environment for the coal-slime dense medium cyclone, equipment is guaranteed to be operated well, and the separation density of the three-product dense medium cyclone, especially the separation density of the two-stage cyclone, can be adjusted on line convenient and rapidly without stopping production.

Description

technical field [0001] The invention relates to a dense-medium coal preparation method in the technical field of coal clean treatment, in particular to a method capable of conveniently and rapidly adjusting the second-stage separation density of a three-product dense-medium cyclone online. Background technique [0002] Pressureless (pressurized) feeding three-product dense medium cyclone coal preparation technology is currently the preferred coal separation technology in my country, and the adjustment of the separation density of the second-stage cyclone has been continued to change the diameter of the bottom outlet and set the online separation method. Separation density adjustment device, these two traditional two-stage cyclone separation density adjustment methods, the former needs to replace the bottom outlet after stopping production, and the latter is not only suitable for fine adjustment of separation density, but also often has difficulty in operation due to wear and c...

AI Technical Summary

Problems solved by technology

Although this method achieves the goal of maintaining a good separation index and ensuring the high separation accuracy of the slime dense medium cyclone, there are still some unsatisfactory aspects, which are manifested in: when the selectivity characteristics of the raw coal occur When the product structure changes or needs to be adjusted, the method provided by the Chinese patent ZL201310158066.9 cannot stop production online, conveniently and quickly adjust the second-stage separation density of the three-product dense medium cyclone

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