Coal slime flotation method with MEA pregnant solution as flotation agent

Abstract

The invention provides a coal slime flotation method with an MEA pregnant solution as a flotation agent. The coal slime flotation method comprises the steps that the MEA pregnant solution and coal slurry are pumped into a stripping tower correspondingly, the temperature in the stripping tower is 80-100 DEG C, the pressure is 0.1MPa, the reaction time is 30-40 min, and then a collector is used forcollecting clean coal after being subjected to flotation; and the volume flow ratio of the MEA pregnant solution to the coal slurry is (3 to 5) to 1. Compared with common CO2 desorption, the desorption temperature is reduced to below 373 K, and the desorption energy consumption is reduced by 20%; and compared with common coal flotation, the recovery rate of coal is increased by 25%, and the flotation energy consumption is reduced by an average of 40%. According to an integrated technology, the energy consumption is reduced, parameters in all aspects of a traditional technology are optimized, efficient CO2 capturing and utilization of fly ash and grizzle in industry (power plant, cement plant and the like) can be realized synchronously, and the coal slime flotation method with the MEA pregnant solution as the flotation agent has significant industrial application value.

Description

technical field [0001] The invention relates to the field of process design, in particular to a coal slime flotation method using MEA rich liquid as a flotation agent. Background technique [0002] CO from fossil fuel combustion 2 It is the primary cause of global warming, and its contribution to the greenhouse effect has exceeded 70%. Power plants as a typical CO 2 emission source, is the future CO 2 key industrial processes for emission reduction. In many CO 2 Among the capture methods, the amine absorption method is a capture method with good development prospects and has been widely used in industry. However, using an amine solution for CO 2 Capture is expensive due to energy consumption during desorption and loss of amine solution due to evaporation. Therefore, it is necessary to reduce the absorption of CO by the amine solution from the aspects of process intensification, reactor modification, parameter optimization, etc. 2 Energy consumption is a research hots...

AI Technical Summary

Problems solved by technology

At present, in the process of flotation coal preparation, there are generally problems such as complicated process, large amount of flotation reagents, and low selectivity for fine-grained coal and low-quality coal.

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