Coal gangue sorting process

Abstract

The invention discloses a coal gangue sorting process. The coal gangue is separated through the steps including the steps of making the coal gangue enter a sulfur recovery sorting system after crushing and graded milling and the like. The invention is characterized in that the sulfur recovery sorting system adopts a cyclone device for separating the coal gangue in the sorting step, and the conical angle of the cyclone device is between 70 and 90 DEG C. The sulfur ore concentrate products produced by the invention are between 4 and 0 mm, the sulfur content is more than or equal to 28.40 percent, the sulfur ore concentrate products are mainly used for chemical plants, the produced boiling ash coal content can be lower than 70 percent, the sulfur content is lower than 4.0 percent, the products are mainly used for power plants (to be merged with electric coal and coal discharged from a dense medium system), and the system full sulfur recovery rate is more than or equal to 70 percent. The produced kaolin coarse ore ash content is more than 80 percent, and products can be used as raw materials for producing aluminium oxide, aluminium sulphate or basic aluminum chloride. The percentage is metered by mass percent.

Description

technical field [0001] The invention relates to a coal gangue sorting process, in particular to a cyclone sorting coal gangue process. Background technique [0002] Coal gangue is a by-product of coal mine sorting and processing. Due to its high sulfur content, it cannot be used directly as fuel. Therefore, it must be reprocessed and utilized for comprehensive utilization. At present, most coal gangue sorting systems use ladder jumping, shaker or spiral sorting machines as the main sorting process to separate coal gangue into boiling coal, sulfur concentrate and other products. The above-mentioned treatment processes have small processing capacity, The sorting accuracy is poor, especially when sorting fine particles (less than 1mm), fine-grained coal gangue is easily mixed into boiling coal, causing high sulfur content in boiling coal. For the shaking table sulfur separation process, the process flow is: after the coal washing gangue is crushed by the crusher, it is classif...

AI Technical Summary

Problems solved by technology

[0004] (1), low processing capacity, large footprint

Due to the low processing capacity of a single device, the processing capacity per unit area of ​​the shaking table is only 0.3-0.5t / h.m 2 , resulting in the use of more equipment and too large an area

[0005] (2) The shaking table has poor sorting effect when sorting materials with a wide particle size range

Especially in order to ensure coarse-grained separation, fine-grained coal is easy to directly enter the boiling coal, resulting in high sulfur content in boiling coal, which is used to control the operation of the desulfurization system of the power plant. 2 (According to the current operation of sulfur fixation and flue gas desulfurization facilities in the furnace of low calorific value coal power plants, the sulfur content of fuel is required to be less than 4.5%)

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