空化射流强化煤气化细渣浮选炭灰分离研究OA

Coal gasification fine slag(CGFS)faces technical bottlenecks such as high reagent consumption and poor separation indices in conventional flotation technology due to the well-developed pore structure on the residual carbon surface and severe oxidation.In this study,a cavitation jet was introduced into conventional to enhance the flotation process,and flotation tests and flotation kinetic studies were carried out on three types of CGFS.Compared with the conventional flotation results,for the three CGFS samples,cavitation-jets flotation increased the flotation perfection index by 24.40%,19.84%,and 16.48%,while reducing the kerosene dosage by 60%,20%,and 60%.The results fitted by the classical first-order kinetic model show that the flotation rate constant k values of all three CGFS samples enhanced by cavitation jets increase to above 0.8,indicating a significantly improved flotation rate.The analysis results show that compared with the conventional flotation technique,the significant reduction of kerosene droplet size after cavitation jet enhancement promotes the enhancement of hydrophobicity on the residual char surface,and at the same time generates microbubbles with an average bubble size of less than 56.9 μm,which explains to a certain extent the improvement of carbon-ash separation effect.Cavitation jet enhances the flotation carbon-ash separation process of CGFS,which has significant advantages in reducing reagent dosage and improving separation indices,and has good adaptability to different CGFS.The cavitation jet provides a technical approach for the efficient flotation carbon-ash separation of CGFS.