Coal slime recovery device and process

Abstract

The invention discloses a coal slime recovery device and process. The coal slime recovery device comprises a two-stage cyclone separation device, a flotation device, a high-frequency vibrating screen and a spiral separator; the two-stage cyclone separation device comprises a pre-stage cyclone and a post-stage cyclone; a first overflow port and a first underflow port are formed in the pre-stage cyclone, and a second overflow port, a third overflow port and a second underflow port are formed in the post-stage cyclone; a first granular material is obtained at the first overflow port, a second granular material is obtained at the second overflow port, a third granular material is obtained at the third overflow port, and a second underflow product is obtained at the second underflow port. The coal slime recovery device and process have the benefits that a small quantity of fine coal is obtained after the first granular material and the second granular material are floated, the third granular material has the characteristics of fine particle and high ash content and also has good ash reduction effect and large fine coal recovery rate after being further treated by the high-frequency vibrating screen, the second underflow product has the characteristics of high density and low ash content, and a small quantity of fine coal can be recovered after the second underflow product is further treated by the spiral sorter.

Description

technical field [0001] The invention relates to a coal slime recovery device and a coal slime recovery process using the coal slime recovery device. Background technique [0002] The coal preparation process mainly includes jigging, dense medium separation and flotation processes. Among them, the particle size range applicable to the jigging and dense medium separation processes is 0.5mm to 50mm, and the particles below 0.25mm are generally separated by flotation. However, at present, there is still a lack of an effective treatment process for the refractory coal slime particles in the size range of 0.25 mm to 0.5 mm, especially for the separation of clean coal in the magnetotail or TBS underflow. The following problems often exist in the existing coal slime recovery technology: (1) the cyclone separation method is suitable for the separation of low-density coal slime particles, but its overflow product has a high ash content, and the underflow high-density coal slime separ...

AI Technical Summary

Problems solved by technology

However, at present, there is still a lack of an effective treatment process for the refractory coal slime particles in the size range of 0.25 mm to 0.5 mm, especially for the separation of clean coal in the magnetotail or TBS underflow.

The following problems often exist in the existing coal slime recovery technology: (1) the cyclone separation method is suitable for the separation of low-density coal slime particles, but the ash content of the overflow product is high, and the underflow high-density coal slime separation is not thorough , which reduces the separation efficiency; (2) adopting a spiral separator to separate the coal slime, although it is suitable for the separation of high-density particles, the ash content of the obtained clean coal product is relatively high; (3) in order to reduce the recovery of clean coal Ash content is usually processed by high-frequency vibrating screen, but it can only remove the fine mud particles with high ash content in the coal slime, and cannot remove the high-ash coarse particles larger than the size of the screen.

Images