High-ash fine-particle coal slime sorting device and method

Abstract

The invention discloses a high-ash fine-particle coal slime sorting device and method which are applicable to the field of coal slime flotation devices. A foam sprinkling device arranged in the top end of a columnar structure; a fine coal discharge opening is formed in the bottom of a fine coal overflow tank; a feeding pipe is axially arranged in the circle center of the columnar structure; the feeding pipe is provided with a feeding device; two groups of filling devices are respectively strung on the feeding pipe; the filling devices adopt closely arranged cylindrical structures; the cylindrical structures are longitudinally penetrated; an internal sprinkling water washing device matched with the body of a flotation column is arranged inside the cylindrical structure and is close to the inner wall of the cylindrical structure; a middling discharge device is arranged below the cylindrical structure; a scavenging section is arrange at the bottom of the middling discharge device; a circulating pump and a micro-bubble generator are sequentially connected with an external outlet through pipelines; a plurality of hydrocyclones are separately arranged above the side wall of the fine coaloverflow tank; each hydrocyclone is provided with a material inlet connector; the material inlet connector is connected with a middling discharge opening. The device is compact in structure, and caneffectively enhance the recovery rate and fine coal quality of high-ash difficult floatable coal slime flotation products, and reduce coarse particle loss in coal particles.

Description

technical field [0001] The invention relates to a sorting device and method for high-ash fine-grained coal slime, and is especially suitable for the sorting device and method for high-ash fine-grained coal slime used in the field of coal slime flotation devices. Background technique [0002] With the deterioration of my country's resource situation in recent years and the advancement of coal mining technology, the ash content of raw coal mined in my country has increased year by year; and the dense medium process that is currently the absolute mainstream will intensify the production of secondary coal slime and broken coal slime. , Under the double action of raw materials and process, the requirements for the treatment capacity and treatment effect of refractory coal slime are increased in the process, and the requirements for the flotation process are mainly in the overall process. [0003] Currently, the devices mainly used in the flotation process are flotation machines an...

AI Technical Summary

Problems solved by technology

As the most widely used flotation device nowadays, the flotation machine has the advantages of high recovery rate and ideal coarse particle recovery effect, but its natural structure determines its characteristics such as short separation time and short stroke, resulting in the flotation of clean coal. Disadvantages such as poor quality and poor recovery of fine particles

The flotation column benefits from its design with a longer trapping area and a thicker foam layer, so that it has better quality of clean coal, but it also has poor recovery of coarse particles, severe gangue with coal, and domestic flotation. The automatic control device of column selection is poor, making it difficult to be widely used like flotation machines

For high-ash refractory coal slime, the general device often causes the flotation machine to have a good recovery effect but the ash content of the clean coal is too high and there are many fine coals in the tailings and the ash content is too low, while the flotation column can guarantee Good clean coal ash content, but clean coal recovery rate is not ideal and "coarse running" is serious

The patent public number is: CN101757982A, a kind of coal slime separation process, although considering the influence of coal interlinked organisms on coal ash content and recovery, it can effectively improve the quality and recovery rate of clean coal, but excessive fine grinding will cause such as in the material There is too much fine mud, and the selectivity of foam to fine particles is poor, which may pollute clean coal, and this process does not solve the shortcomings of traditional flotation devices. There are disadvantages, so it is extremely necessary to develop a flotation device that occupies a small area and has a good effect and is suitable for high-ash refractory coal slime

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