A washing equipment for coal with high ash, high mud and high gangue

Abstract

The invention provides washing equipment for coal with much ash, mud and gangue. According to the washing equipment, raw coal enters an air dense medium coal picker first, a three-product dense medium cyclone is connected to the rear portion of the air dense medium coal picker, a coarse clean coal outlet of the three-product dense medium cyclone is connected with a medium-removing dewatering screen, a coarse gangue outlet is connected with another medium-removing dewatering screen, a coarse middling coal outlet is connected with dense medium separation equipment, and a flotation column, a spiral chute and a water medium cyclone are sequentially connected to the rear portion of the dense medium separation equipment. A second-level flotation column is used during floatation, so that floatation efficiency and the flotation recovery rate are both considered.

Description

technical field [0001] The invention relates to coal slime sorting equipment, in particular to the sorting equipment suitable for refractory coal slime with high ash, high mud and high gangue. Background technique [0002] With the over-exploitation of coal in our country for many years, high-quality coal resources are becoming less and less, and lean coal mines that were difficult to mine and recover in the past have now become mine sources that must be faced. Most of these lean coal mines have high ash, High mud, high gangue rate, poor selectability and other aspects. Among them, the content of -200 mesh fine coal increases, resulting in the high ash content of flotation clean coal often due to the entrainment of high ash and fine mud, and the coarse-grained joints also interfere with the flotation process, and the ash content of joint minerals is generally close to the ash content of raw coal , the proportion accounts for about 20% of the raw coal. If the connected bioma...

AI Technical Summary

Problems solved by technology

This process is mainly suitable for the separation of conventional easy-to-separate coal slime, and is widely used in my country. However, for high-ash, high-mud, and high-sludge difficult-to-separate coal slime, this process has the defects of low product recovery and production efficiency, and it is difficult to solve the problem of high ash. The influence of fine mud entrainment and associated minerals on the flotation process, so the development of key technologies for high-efficiency separation of high-ash refractory coal slime and high gangue ratio has become a problem that needs to be solved urgently in the process of efficient and clean utilization of coal resources

Images