Gangue pre-discharging process for selecting coking coal as raw coal and screening device thereof

Abstract

The invention discloses a gangue pre-discharging process for selecting coking coal as raw coal and a screening device thereof. The gangue pre-discharging process comprises the processes of crushing, screening grading, separating and discharging gangue, performing screen underflow treatment and performing gangue discharging on second-stage screen underflow; the screening device comprises a first supporting frame; a polyurethane screen body is arranged on the first supporting frame; supporting feet which are distributed in arrays are arranged below the first supporting frame; elastic pieces which are distributed symmetrically are arranged on the supporting feet; a second supporting frame is arranged below the first supporting frame; and a first belt conveyor and a second belt conveyor are arranged on the second supporting frame. According to the gangue discharging process disclosed by the invention, the ash content of the raw coal of a mine is reduced; part gangue is discharged; the production pressure of a coal preparation plant for the coking coal is lightened; the transportation expense and the expense for re-screening are reduced; the screening device is skillfully provided withtwo stages of different screen holes, so that materials with three grain grades are graded by single equipment; the plant layout height is reduced; the investment in infrastructure is reduced; and a process flow is simplified.

Description

technical field [0001] The invention relates to the field of coal mine production, in particular to a coking coal pre-discharging process for selected raw coal and a screening device thereof. Background technique [0002] The resource endowment conditions of "rich coal, poor oil, and little gas" determine that coal occupies a dominant position in my country's primary energy production and consumption structure, of which scarce coking coal reserves account for about 30% of the total coal, and the state proposes protective mining requirements. In recent years, with the improvement of mining mechanization, the amount of gangue in raw coal is getting higher and higher, and the quality of coal is getting worse. In addition, gangue is easy to muddy, which increases the washing cost of coking coal preparation plant and the pressure of coal slime water treatment. [0003] At present, there are inspecting manual selection, heavy medium selection and dynamic sieve removal of gangue be...

AI Technical Summary

Problems solved by technology

The on-site operating environment of inspection manual selection is harsh, and only wooden blocks, ironware, and a small amount of large pieces of gangue can be picked out. In the wet coal preparation process, the minimum separation limit is 25mm. Affected by the screening effect, the fine-grained coal slime enters the gangue discharge process, and it is necessary to increase the coal slime water treatment process. The process configuration is relatively complicated, and the coal slime is transported to the coal preparation plant for re-sorting Affect the unloading efficiency, the hardened coal slime cannot be fully wetted, which will affect the separation accuracy of the process, enter the clean coal product, cause the ash content of the clean coal to exceed the standard, and increase the processing pressure of the subsequent slime flotation link and the slime water settlement process

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