A fine-grained coal microwave medium enhanced magnetic separation cleaning system and process

Abstract

The invention discloses a fine coal microwave medium intensified magnetic separation cleaning system and a fine coal microwave medium intensified magnetic separation cleaning process. The process comprises the following steps: preparing materials, performing microwave pretreatment, performing magnetic separation, desulfurization and ash fall, and recovering the magnetic medium; allowing coal to be selected to enter a coal mill for milling the coal, feeding the coal into a pulverized coal bin, feeding the powdered coal and the magnetic medium into a mixing barrel for uniformly stirring and mixing; allowing the mixed materials to enter a buffer bin, allowing the materials to enter microwave treatment equipment for performing pretreatment, treating organic sulfur removed from the coal through a gas trapping treatment device, allowing the materials subjected to the microwave pretreatment to enter a first-section strong magnetic separation machine for performing magnetic separation, allowing the tailings to enter a second-section strong magnetic separation machine for separating again, allowing the tailings to enter a clean coal bin, and allowing the first and second section strong magnetic separation concentrate to enter a first-section weak magnetic separation machine for performing magnetic separation; and allowing the concentrate to enter a second-section weak magnetic separation machine for performing magnetic separation, returning the concentrate back to a magnetic medium barrel for recycling, and allowing the first and second section weak magnetic separation tailings to enter a tailing bin. According to the system and the process, simplicity is realized, the rout is reasonable, the treatment capacity is high and the operation is stable, and environmental pollution caused by fire coal can be effectively alleviated.

Description

technical field [0001] The invention relates to a fine-grained coal dry magnetic separation cleaning system and process, in particular to a fine-grained coal microwave medium enhanced magnetic separation cleaning system and process. Background technique [0002] Coal occupies a dominant position in my country's energy consumption structure, and the efficient and clean utilization of coal resources is of great significance to my country's energy supply and environmental protection. In 2012, the national soot emission was about 12.343 million tons, SO 2 The emissions are about 21.176 million tons, of which the soot and SO 2 Emissions accounted for 70% and 75%, respectively. The quality of raw coal in my country is poor, and the content of ash and sulfur is high. Low ash coal with ash content less than 10% only accounts for 15%-20% of the reserves, and medium-high sulfur coal with sulfur content greater than 1% accounts for 33% of the total. The efficient and clean processin...

AI Technical Summary

Problems solved by technology

The main reason is that the magnetism of pyrite is weak, the structure and composition of coal are extremely complex, and no clean, efficient and economical surface magnetic separation strengthening technology for pyrite has been found; the existing high gradient magnetic separation equipment uses magnetoelectric Mainly, although the electromagnetic high-gradient magnetic separator has a good separation effect on other weakly magnetic minerals, it is not suitable for the separation of coal-measure minerals such as coal-measure pyrite with weaker magnetic properties from the coal matrix; dry high-gradient magnetic separation technology There are outstanding problems that the magnetic accumulation medium is easy to be blocked and the processing capacity of the equipment is small; in addition, the cost and operating cost of the electromagnetic high-gradient magnetic separator are relatively high

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