Method and device for screening coal and coal gangue based on material density

Abstract

The invention provides a method and device for screening coal and coal gangue based on the material density. On the basis that the density of coal and the density of coal gangue are different, online screening and sorting are performed on coal and coal gangue by means of the synergistic effect of an X-ray and a dot matrix detector and an ultrasonic ranging device. The synergistic effect of the X-ray and dot matrix detector and the ultrasonic ranging device is sufficiently utilized, online screening and sorting of coal and coal gangue are performed, a dot-matrix detector is adopted, and the data hanging capacity is just about one fifty that of a linear array detector.

Description

technical field [0001] The invention belongs to the technical field of coal preparation, and relates to a method and equipment for screening coal and gangue based on material density, which is suitable for using X-ray and lattice detectors and ultrasonic distance measuring devices based on the density difference between coal and gangue Synergy screens and sorts coal and gangue online. Background technique [0002] Coal gangue is an accompanying substance in the process of coal production and processing. It has low calorific value and many harmful materials, which seriously affects product quality. It needs to be screened and sorted in time. Coal and gangue with smaller particle size can be removed by medium coal washing or composite dry method (wind selection) coal preparation. For lump coal and gangue, the screening methods in the prior art mainly include artificial Sorting, image screening methods, gamma ray screening and X-ray screening, etc., these screening methods hav...

AI Technical Summary

Problems solved by technology

For example, in manual sorting, the common problems are high labor intensity, harsh working environment, and low efficiency; the image screening method is based on the color grayscale of coal and coal gangue, and the existing problem is that it is difficult to screen black coal gangue similar to coal; The gamma ray screening method is difficult to screen coal gangue with a thickness of more than 100mm, and gamma ray is potentially harmful to the human body and the environment; X-ray screening has problems such as complicated follow-up procedures, and X-ray detectors are based on X-ray imaging technology. Linear array detectors have many pixels and a large amount of data processing. They need to be equipped with industrial computers for processing. In addition, they cannot solve the influence of material particle size and are not suitable for the specific use environment of coal mines.

[0003] With the development of barren mines and the need for coal gangue screening, there is an urgent need to comprehensively utilize the advantages of the above screening methods. Mineral dressing technicians from major universities and research institutes have invested a lot of research effort in development and research. Due to the technical difficulty and It requires a lot of capital investment, and so far there is no precedent for the comprehensive utilization of the above screening methods

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