Abstract: The residual carbon particles embedded in gasification fines exhibit a well?developed pore structure, a feature that positions them as promising candidates for low?cost porous adsorbents. Given this potential, achieving an effective separation of carbon from ash in such fines becomes a matter of considerable practical importance. Nevertheless, the combination of this highly porous nature and the inherently weak hydrophobicity of the residual carbon creates two significant hurdles in conventional flotation operations: poor adhesion between bubbles and particles, and a high demand for collector agents.To address these issues, colloidal gas bubbles (CGAs) were generated using dodecyl polyoxyethylene ether (AEO-4), a nonionic surfactant. When these CGAs were incorporated into the gasification fine slag (GFS) flotation system, a noticeable improvement in the separation efficiency of carbon and ash was observed. Under identical concentrate recovery conditions, the CGA?assisted flotation process achieved a reduction in kerosene consumption exceeding 50.00%, relative to that required in conventional flotation where only AEO?4 was used.A series of experiments were carried out to examine how the introduction of CGAs influences several key flotation parameters, including the bubble?mineralization collision cycle, induction time, bubble velocity, and contact angle. The findings indicate that the presence of CGAs facilitates both the attachment of bubbles to gasification fines and the subsequent mineralization process. Specifically, the induction time measured between bubbles and the surface of fines pre?treated with CGAs was 220?ms. When kerosene was added in conjunction with CGAs, this induction time dropped to 165?ms, suggesting that CGAs enhance the adsorption of kerosene onto the particle surface and thus serve as an effective collector in the system.In addition, the application of CGAs was found to contribute to a marked increase in the surface hydrophobicity of the gasification fines. Among the various conditions tested, the contact angle formed between conventional bubbles and the fines surface after treatment with 180?mg/L CGAs was significantly larger than those recorded under other treatment regimes, further confirming the role of CGAs in improving surface properties favorable to flotation.