Wide-particle-grade coal slime flotation method

Abstract

The invention discloses a wide-particle-grade coal slime flotation method. The method comprises the following steps that wide-particle-grade coal slime is divided into a coarse particle grade and a fine particle grade, then water is correspondingly added into the coarse particle grade coal slime and the fine coal slime for stirring so as to prepare ore pulp, collecting agents are correspondingly added into the two kinds of ore pulp for stirring, then the two kinds of ore pulp are transferred into a flotation tank, a foaming agent is added, mixing and stirring are carried out, bubbles are fed,and bubble scraping is carried out as to obtain flotation clean coal and tail coal. According to the method, particle-grade pulp preparation is achieved, and a mixing air inflation process is used, sothat the requirements of coal slime pulp mixing performance of different particle grades are met, the dosage of agents is saved, then covering of high-ash fine mud on the surface of the coarse granular coal can be effectively reduced, the quality of the clean coal is improved, the excessive adhesion of the fine-particle-grade coal slime to the collecting agents is reduced, meanwhile, the desorption rate of the coarse coal slime can be reduced, and the recovery rate of the coarse coal slime can be improved; and the particle-grade pulp preparation and the air inflation flotation process are used for improving the recovery rate of coarse particles in the raw coal, the effective recovery of the wide-particle-grade coal slime is realized, and the flotation problem of the wide-particle-grade coal slime is solved.

Description

technical field [0001] The invention relates to a coal slime flotation method, in particular to a wide-grained coal slime flotation method, which relates to wide-grained coal slime slurry adjustment and mixed aeration flotation. Background technique [0002] Coal is the most important energy source in my country, and its dominant position in the primary energy consumption structure will not change for a long time in the future. In order to meet the energy demand of rapid economic development, the amount of coal mining is increasing year by year, and the task of coal washing is very arduous. With the improvement of the degree of coal mining mechanization, the depth of coal mine mining continues to deepen; the characteristics of my country's coal resources are fine, miscellaneous, and difficult, and the proportion of coal slime in raw coal is increasing. [0003] High-efficiency coal sorting technology is an important prerequisite for realizing clean and efficient utilization...

AI Technical Summary

Problems solved by technology

However, for wide-grained coal slime, the contents of coarse-grained and fine-grained coal slime are different, and fine-grained coal slime tends to excessively adhere to the collector, occupying too much collector, resulting in the interaction with coarse particles. If the collector is reduced, the coarse particles cannot be effectively acted on by the collector, causing the coarse particles to be easily desorbed in the flotation, and the high-ash fine mud in the fine particles is easy to form a cover on the surface of the coarse particles, which eventually leads to an excessively high ash content in the clean coal

At present, the processing methods for wide-grained coal slime mainly include classification coarse-grain machine flotation-fine-grain column flotation, two-stage flotation and two-stage recovery, flotation machine roughing-flotation column selection, and heavy flotation combined separation. However, the above means require a large space, complex system and high cost

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