Coal slime flotation method with MEA pregnant solution as flotation agent

• Main Authors: ZHANG CHEN, ZHANG JINGFENG, YU YUNSONG, DING WANCHENG
• Format: Patent
• Language: Chinese; English
• Published: 29.03.2019
• Subjects: DIFFERENTIAL SEDIMENTATION; FLOTATION; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLIDMATERIALS OR FLUIDS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS; SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATICTABLES OR JIGS; TRANSPORTING

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 an