Duan Chenlong

Notice of Retraction The experimental and practical teaching system of the discipline of mineral processing engineering in China University of Mining and Technology

Taking the technology of the processing and utilization of coal resource and clean coal technology as its characteristic, the discipline of mineral processing engineering of China University of Mining and Technology (CUMT) is a Chinese national key discipline, and it has formed a passel of world advanced research achievements and became an important base for the education and scientific research of Chinese mineral processing engineering, and it also has high position and effect in the scientific field of the world. This discipline has a strong back ground of engineering, therefore, the reform of discipline experiments and practical teaching is very important for the cultivation of the spirit of innovation and practical engineering ability of the students. The base and preceptor condition of this discipline were introduced in the paper, and the experimental and practical engineering cultivation system of this discipline in CUMT was discussed from three layers, and the achievement of this system was introduced, too.

The Progress of the Pulsing Airflow Fluidized Bed for Separating the Fine Coal

Because of the bubbles and intense backmixing of the medium in the conventional air dense medium fluidized bed (ADMFB), the alternative size range of the feeding is +6mm. The innovation of employing the pulsing airflow to the fluidized bed (PFB) can significantly strengthen the gas-solid contact and reduce the formation of the bubbles. To study the bubble behavior and energy transfer in the fluidized bed, the simulation of the Eulerian- Eulerian (EE) model was conducted on the gas-solid system. The results show that the lower bed height can decrease the energy collision and mergers. The comparison between ADMFB and PFB indicates that pulsing energy flow can effectively decrease the vortexes and make the energy flow transfer along with the vertical direction of the bed. The software of “Design Expert” was adopted to conduct an orthogonal test with the factors of gas velocity and pulsing frequency. As for the best separation results, the E value of 0.093g/cm3 and the clean coal ash content of 33.69% were achieved with the yield 52.04% and maximum ash content drop 22.46%.