Demonstration device and method for coal floating and sinking test

Abstract

The invention discloses a coal floating and sinking test demonstration device, which comprises a water tank, a pulse pump, a water pump and a floating tank. The bottom of the floating sink tank is connected, the bottom of the water tank is connected with the water inlet of the water pump through the third pipeline, and the water outlet of the water pump is connected with the upper part of the floating sink tank through the fourth pipeline. The upper part of the floating sink tank is provided with an overflow weir. It is equipped with agitator, high-density PVC granules, medium-density PVC granules and low-density PVC granules. There is a floating object collection box under the overflow weir. The bottom of the floating object collection box is equipped with a return pipeline. As for valves, a horizontal flow check valve is arranged on the third pipeline, and an ascending flow check valve is arranged on the second pipeline. The invention also provides a method for performing coal floating and sinking test demonstration by using the device. The invention has the advantages of low cost, high safety, strong intuitiveness, strong applicability and easy operation.

Description

technical field [0001] The invention belongs to the technical field of coal floating and sinking tests, and in particular relates to a coal floating and sinking test demonstration device and method. Background technique [0002] When the bulk material is placed in a heavy liquid with a certain density, according to Archimedes' law, the particles with a density greater than the density of the heavy liquid will sink (sink), and the particles with a density lower than the density of the heavy liquid will float (float), Particles with a density close to or the same as that of the heavy liquid will be in suspension. For coal preparation, there is a strong correlation between coal density and quality, which is also the basis for using gravity separation to obtain higher quality clean coal products. According to the above principles, the experiment of using special tools to pick up materials of different densities in heavy liquids of different densities is the floating and sinking...

AI Technical Summary

Problems solved by technology

[0004] At present, coal floating and sinking tests are all manually operated, and the test medium, namely the heavy liquid, is usually configured with highly corrosive zinc chloride. Rubber boots, masks, rubber gloves, protective glasses, and rubber aprons, etc.; at the same time, the test equipment such as heavy liquid buckets, mesh bottom buckets, etc. are relatively heavy, and the labor load is very large during the test.

[0005] During the teaching of coal floating and sinking test, there are many students. Out of thirst for knowledge, they often gather in the test operation center. During the initial learning, the students are unfamiliar with the operation, which may easily cause splashing of heavy liquid medium, and strong corrosive If the zinc chloride heavy liquid is splashed on the skin or even the face of the gathered students, it will cause serious safety accidents

At the same time, the existing operation mode is not conducive to the intuitive teaching of knowledge. The barrels containing the heavy liquid are often made of stainless steel, and the coal itself will make the zinc chloride heavy liquid turbid. Therefore, the existing operating test equipment and methods are not intuitive for students. The stratification of coal in the heavy liquid was clearly observed, and the understanding of the principle and operating points of the test was not high.

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