Flotation process for difficultly selected coal slime with high middle density substance content

Abstract

The invention discloses a flotation process for difficultly selected coal slime with high middle density substance content. The flotation process consists of five parts, namely preparing input floating coal slime into slurry, performing rough selection on the coal slime subjected to slurry preparation, grading cleaned coal subjected to rough selection, grinding and performing rough selection again on the coarse cleaned coal subjected to rough selection after the coarse cleaned coal is graded and performing fine selection on the fine cleaned coal subjected to rough selection. Flotation equipment is adopted and matched with corresponding concentration grading equipment and coal grinding equipment, so that a process of performing rough selection by the flotation equipment, grading the cleaned coal subjected to rough selection, grinding the coarse cleaned coal subjected to rough selection and independently performing fine selection on the fine cleaned coal subjected to rough selection is formed. Most high-ash gangue minerals are removed from the input floating coal slime after primary rough selection, so that the adverse influence of the high-ash fine slit on the subsequent coal slime grinding process is reduced; and due to the separation of coal and gangue integrated bodies in the coarse cleaned coal subjected to rough selection and further flotation recycling of the coal slime subjected to separation, the contradiction between the quality and the recycling rate of a difficultly selected coal slime separation product is avoided. The flotation process is simple, small in investment, low in power consumption and low in running cost. Compared with the conventional separation process, the flotation process is high in separation efficiency, high in combustible recycling rate and remarkable in economical benefit.

Description

technical field [0001] The invention relates to a coal slime separation process, in particular to a flotation process suitable for refractory coal slime with high intermediate density content, and belongs to the technical field of mineral separation. Background technique [0002] When the density in the slime is 1.4g / cm 3 -1.8g / cm 3 When the weight of the material between them accounts for more than 30% of the total material, it can be called high intermediate density coal slime. When the content of intermediate density is high, there are many particles of coal and gangue, and the coal and gangue cannot be effectively separated by flotation, resulting in coal loss in tailing coal, or gangue entrained in clean coal; when the content of intermediate density When it is low, the content of pure coal and pure gangue particles is high, and coal and gangue can be effectively separated by simple flotation. With the improvement of my country's coal mining mechanization, the deteri...

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Problems solved by technology

For the separation of refractory coal slime with high intermediate density, the process generally has the defects of low product recovery and production efficiency, which seriously restricts the quality of the final clean coal product

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