Gemini表面活性剂协同强化低阶煤浮选机理研究

doi:10.11799/ce202202023

Abstract

Abstract: In this paper, didodecyldimethylammonium bromide (DDAB) was selected as Gemini surfactant, kerosene (C12) and methyl oleate (MO) were used as collectors to investigate the promotion mechanism of DDAB on low rank coal flotation. Through the slime flotation unit test, the optimal dosage of DDAB was determined as 0.5 mM. At this time, the clean coal yield of DDAB/C12 synergistic action was 76.91%, and the clean coal yield of DDAB/MO synergistic action was 75.86%. The infrared spectra of low rank coal before and after the reagent action were measured. The results showed that DDAB masked the-OH and-C=O groups on the surface of low rank coal. Through simulation analysis, DDAB has the highest molecular activity and is more easily adsorbed on the surface of low rank coal. The adsorption form of mixed reagent on the surface of low rank coal is laminated co-adsorption, DDAB preferentially adsorbed on the surface of low rank coal, followed by C12 and MO.

CLC Number:

TD94

References

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Study on the mechanism of Gemini surfactant synergistic strengthening low-rank coal flotation

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