Coal separation method for advanced dense medium cyclone technology

Abstract

The invention provides a coal separation method for advanced dense medium cyclone technology. A floatation machine is adopted for coal separation. Tailings of a tailing magnetic separation machine and tailings of a clean coal magnetic separation machine are placed in the floatation machine through a pump. Clean coal after floatation separation is dewatered and recycled through a horizontal type settlement centrifugal dehydrator and a clean coal pressure filter. Filtrate returns to a floatation separation entry material. Floatation separation tailings automatically flow to a two-section thickener. Bottom fluid of the two-section thickener is recycled through a pressure filter. Filtrate of a tailing pressure filter and overflow of the two-section thickener serve as circulating water to be reused and closed cycle is achieved. An FJC-16-6 air jet floatation machine is adopted for the coal wash and designed handling amount is 640m<3> / h. According to field data, practical handling amount of the floatation separation machine is 325m<3> / h and tailing flow of the tailing magnetic separation machine is 225m<3>. The tailings of the tailing magnetic separation machine are separated in a floating mode, the design handling amount of the floatation separation machine is not exceeded and therefore the coal separation method for the advanced dense medium cyclone technology is feasible.

Description

technical field [0001] The invention relates to the technical field of coal washing and washing industry, is an innovation of a dense medium coal preparation process without desliming and pressure-free feeding, and is suitable for the transformation of old coal preparation plants and the construction of new coal preparation plants. Background technique [0002] The domestic coking coal washing process mainly adopts jigging coal preparation process, dense medium cyclone coal preparation process and jigging+dense medium cyclone coal preparation process, among which jigging coal preparation is suitable for washing easy coal preparation, medium reliability Separation coal; Dense medium cyclone is suitable for washing hard-separation coal and extremely difficult-separation coal. Due to the generally poor coal quality of domestic coking raw coal, which is basically difficult or extremely difficult to prepare coal, the dense medium cyclone coal preparation process is currently used...

AI Technical Summary

Problems solved by technology

[0004] At present, the raw coal washed in the coal preparation plant is medium selectable coal, so there are the following deficiencies in the production practice: 1) Due to the non-desliming process, the slime content in the dense medium suspension is large, so that the actual separation density reaches The separation density is less than the theoretical requirement; 2) The ash content of the tailing coal slime (medium slime) is low, resulting in the loss of clean coal in the tailings; 3) The simultaneous start and stop of coal washing and tailing slime water treatment cannot be realized; 4) Coal slime Cyclone, a section of inclined tube thickening tank and horizontal sedimentation centrifugal dehydrator are not effective

Images