Abstract: To address the separation challenge caused by the similar floatability of beryl and common associated gangue minerals like quartz and albite,a novel cationic-anionic combined collector DG-1 was developed.Through pure mineral and ar tificial mixed mineral flotation tests,the effects of pulp pH and reagent dosage on separation efficiency were systematically in vestigated.The reaction mechanism of DG-1 was analyzed using contact angle,Zeta potential,and Fourier transform infrared spectroscopy (FTIR).The results showed that under optimal conditions (pH=8,DG-1 dosage of 30 mg/L),the recovery rate of beryl reached 90.85%,while the recoveries of quartz and albite were only 0.78% and 0.69%,respectively,showing a sig nificant difference in floatability.The flotation of ternary artificial mixed minerals (mass ratio of 1∶1∶1) yielded a qualified be ryllium concentrate with BeO grade of 11.85% and BeO recovery of 81.19%.The mechanism study confirmed that DG-1 selec tively adsorbs on the beryl surface,significantly enhancing its hydrophobicity,which is a result of both physical and chemical adsorption.In contrast,only weak physical adsorption occurs on the surfaces of quartz and albite,with minimal impact on their floatability.This research provides a novel reagent and theoretical basis for the efficient and selective flotation of beryl.

Key words: combined collectors,beryl,flotation separation,adsorption mechanism,surface property