Coal slime floating process

Abstract

The invention discloses a coal slime floating process, which comprises the following operations: adjusting slurry of floatation coal slime; floating the coal slime; concentrating and classifying; and regrinding and refloating middlings. Coal slime floating equipment is adopted and is matched with corresponding slurry adjusting, concentrating and classifying, and coal grinding equipment; the coal slime after slurry adjusting is floated by the floatating equipment; and the floated tailings are sorted by the concentrating and classifying equipment to prepare a middling product and a final tailing product. For the middling product with better monomial dissociation, the middling product is directly returned to the slurry adjusting operation, is subjected to slurry adjusting by the slurry adjusting equipment and then is sorted again so as to form a middling refloating process for high ash and difficult floatable coal slime; and for the middling product with poor monomial dissociation, the middling product is subjected to coal grinding operation by a coal mill, returned to the slurry adjusting operation by the slurry adjusting equipment, and then is sorted again so as to form a middling regrinding and refloating process for the high ash and difficult floatable coal slime; therefore, the conflict between the quality of clean coal and combustible component recovery rate in the floatation of the high ash and difficult floatable coal slime is solved. The coal slime floating process has the advantages of simple process, low investment, low operating cost and high separation efficiency.

Description

technical field [0001] The invention relates to the technical field of coal slime flotation, in particular to a coal slime flotation process suitable for regrinding and reselecting coal in high-ash refractory coal slime. Background technique [0002] Coal is the main energy source in my country, accounting for about 70% of primary energy. In a long period of time in the future, the dominant position of coal in my country's energy structure will not change. However, coal is an unclean energy, and a large amount of coal burning has caused serious air pollution. The main reason for this situation is that the purification technology and method of coal itself are not perfect, especially the high-ash refractory coal slime, which accounts for about 20% of coal production, cannot be effectively separated. With the improvement of my country's coal mining mechanization, the deterioration of resource geological conditions, the large-scale construction of coal preparation plants and th...

AI Technical Summary

Problems solved by technology

For the separation of high-ash refractory coal slime, the high content of medium coal is a major factor leading to its difficulty in separation. This process generally has the defects of low product recovery rate and low production efficiency, which seriously restricts the quality of the final clean coal product.

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