Separation of metal laden waste using pulsating air dry material separator

  • Y. He
  • C. Duan
  • H. Wang
  • Y. Zhao
  • D. Tao


Separation of metal laden solid wastes for their recycling utilization using passive pulsed air and active pulsing air classifiers was studied. Laboratory investigation showed that the active pulsing air separator performs more efficiently than the passive pulsed air separator due to the ability to accurately control operating parameters. By studying the difference of drag coefficients of the particles moving through the airflow of varying Reynolds numbers, models of the dynamic particle motion were developed and a computer simulation was prepared. Results of the simulation were reported to predict the observed results with artificial tracing spheres being separated by the laboratory equipment. Two different, real world feed materials were separated with the laboratory scale active pulsing air classifier. The discarded catalyst consisting of precious metal components and sintered magnetic beads was separated with the separation efficiency, of 97.6 %. The second real-world feed, electronic scrap crushed to a size of 0.5 to 2 mm, showed a separation efficiency of 92.41 %. At the same time, the grade of the recovered concentrate of metals was above 98 %.


Dynamic equation Electronic scraps Pulsating air Recycling Simulation 


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  1. Batchelor, G. K., (1967). An introduction to fluid dynamics. Cambridge Univ. Press, Cambridge, UK.Google Scholar
  2. Birkhoff, G., (1960). Hydrodynamics: A study in logic, fact, and similitude. Revised Ed., Princeton Univ. Press, New York, USA.Google Scholar
  3. Brush, L. M.; Wo, H. W.; Yen, B. C., (1964). Accelerated motion of a sphere in a viscous fluid. J. Hydrodynamics, 90(1), 149–160 (12 pages).Google Scholar
  4. Cao, Y. J.; Wen, X. F.; Zhao, Y. M.; Wang, Q. Q, (2002). Research on selective shredding of wasted printed circuit boards. J. China Univ. Min. Tech., 12(1), 25–29 (5 pages).Google Scholar
  5. Carstens, M. R., (1952). Accelerated motion of a spherical particle. Transactions of American Geophysics Union, 33(5), 713–721 (9 pages).CrossRefGoogle Scholar
  6. Crowe, P. B.; Peirce, J. J., (1988). Particle density and air-classifier performance. J. Environ. Eng., 114(2), 282–399 (18 pages).CrossRefGoogle Scholar
  7. Cui, J.; Forssberg, E., (2003). Mechanical recycling of waste electric and electronic equipment: A review. J. Hazard Mater., B 99(3), 243–263 (21 pages).CrossRefGoogle Scholar
  8. Duan, C. L.; He, Y. Q.; Wang, H. F.; Zuo, W. R., (2003). Separating mechanism of passive pulsing air classifier. J. China Univ. Min. Tech., 32(6), 725–728 (4 pages).Google Scholar
  9. Feng, X. D.; Huang, W. L.; Yang, C.; Dang, Z., (2009). Chemical speciation of fine particle bound trace metals. Int. J. Environ. Sci. Tech., 6(3), 337–346 (10 pages).Google Scholar
  10. He, Y. Q.; Wang, H. F.; Duan, C. L.; Song, S. L.; Zhao, Y. M., (2005). Airflow fields simulation on passive pulsing air classifiers. J. S. Afr. Ins. Min. Metal., 106(4), 525–531 (7 pages).Google Scholar
  11. He, Y. Q.; Zhao, Y. M.; Duan, C. L.; Zuo, W. R.; He, J. F., (2007). Mechanism of active pulsing air classification and its application to waste PCBs disposal. in: International Symposium on Environmental Science and Technology. Beijing, China 8–11 Nov.Google Scholar
  12. He, Y. Q.; Zhao, Y. M., (2009). Technology of pulsing air separation. Chem. Eng. Industry Press, Beijing, China.Google Scholar
  13. Hjelmfelt, A. T.; Mockros, L. F., (1967). Stokes flow behavior of an accelerating sphere. J. Eng. Mech., 93(6), 87–102 (16 pages).Google Scholar
  14. Houghton, E. L.; Carpenter, P. W., (2002). Aerodynamics for Engineering Students. 5th Edition, Butterworth — Heinemann, Oxford, MA, USA.Google Scholar
  15. Igwe, J. C.; Abia, A. A.; Ibeh, C. A., (2008). Adsorption kinetics and intraparticulate diffusivities of Hg, As and Pb ions on unmodified and thiolated coconut fiber. Int. J. Environ. Sci. Tech., 5(1), 83–92 (10 pages).Google Scholar
  16. Ito, S., (2003). Development of pneumatic separator using acceleration column. Metallic ore dressing abroad, 23(5), 38–42 (6 pages).Google Scholar
  17. Jackson, C. R.; Stessel, R. I.; Peirce, J. J., (1988). Passive pulsing air-classifier theory. J. Eng., 114(1), 106–119 (14 pages).Google Scholar
  18. Joseph, W. L., (1979). Coal Preparation. The American Institute of Mining, Metallurgical, and Petroleum Engineers, INC., New York.Google Scholar
  19. Karanfilian, S. K.; Kotas, T. J., (1978). Drag on a sphere in unsteady motion in a liquid at rest. J. Fluid Mech., 87(1), 85–96 (12 pages).CrossRefGoogle Scholar
  20. Khanfekr, A.; Arzani, K.; Nemati, A.; Hosseini, M., (2009). Production of perovskite catalysts on ceramic monoliths with nanoparticles for dual fuel system automobiles. Int. J. Environ. Sci. Tech., 6(1), 105–122 (8 pages).Google Scholar
  21. Kozlowski, J.; Mazurck, T.; Czyzyk, H., (2000). The recovering metals and alloys from the electronic scrap. Metal, 54(11), 645–649 (5 pages).Google Scholar
  22. Luga, A.; Morar, R.; Samuila, A., (2001). Electrostatic separation of metals and plastics from granular industrial wastes. IEE Proc. Sci. Meas. Tech., 148(2), 47–54 (8 pages).CrossRefGoogle Scholar
  23. Mockros, L. F.; Lai, R. Y. S., (1969). Validity of stokes theory for accelerating spheres. J. Eng. Mech., 95(3), 629–640 (12 pages).Google Scholar
  24. Nwuche, C. O.; Ugoji, E. O., (2008). Effects of heavy metal pollution on the soil microbial activity. Int. J. Environ. Sci. Tech., 5(3), 409–414 (6 pages).Google Scholar
  25. Nwachukwu, M. A.; Feng, H.; Alinnor, J., (2010). Assessment of heavy metal pollution in soil and their implications within and around mechanic villages. Int. J. Environ. Sci. Tech., 7(2), 347–358 (12 pages).Google Scholar
  26. Olayiwola, O.; Walzel, P., (2007). Flow pulsation and modified dust surface for process heat transfer intensification. Int. J. Chem. Reactor Eng., 5(A71), 1–9 (9 pages).Google Scholar
  27. Peirce, J. J.; Wittenberg, N., (1984). Zig-zag configurations and air classifier performance. J. Energ. Eng., 110(1), 36–47 (12 pages).CrossRefGoogle Scholar
  28. Senden, M. M. G., (1978). Performance of zig-zag air classifiers at low particle concentrations. Ph. D Dissertation of the Eindhoven Univ. Tech., Eindhoven, Netherlands.Google Scholar
  29. Shah, B. A.; Shah, A. V.; Singh, R. R., (2009). Sorption isotherms and kinetics of chromium uptake from wastewater using natural sorbent material. Int. J. Environ. Sci. Tech., 6(1), 77–90 (14 pages).Google Scholar
  30. Stessel, R. I.; Peirce, J. J., (1986). Comparing pulsing classifiers for waste-to-energy. J. Energ. Eng., 112(1), 1–13 (13 pages).CrossRefGoogle Scholar
  31. Stessel R. I., (1992). Controlling pulsed incompressible flow. J. Eng., 118(1), 1–17 (17 pages).Google Scholar
  32. Taub, J. B.; Peirce J. J., (1983). Instabilities in air classification of fuels. J. Energ. Eng., 109(2), 74–87 (14 pages).CrossRefGoogle Scholar
  33. Tehrani, S. M.; Karbassi, A. R.; Monavari, S. M.; Mirbagheri, S. A., (2010). Role of E-shopping management strategy in urban environment. Int. J. Environ. Res. 4(4), 681–690 (10 pages).Google Scholar
  34. Tippayawong, N.; Khongkrapan P., (2009). Development of a laboratory scale air plasma torch and its application to electronic waste treatment. Int. J. Environ. Sci. Tech., 6(3), 407–414 (8 pages).Google Scholar
  35. Wang, X. F.; Xiong, A. K., (2003). Advanced fluid mechanics. Huazhong Univ. Sci. Tech. Press, Wuhan, China.Google Scholar
  36. Wang, H. F., (2004). Study on the separation mechanism and airflow pattern of pulsed air classifiers. Master’s Thesis of China Univ. Min. Tech., Xuzhou, China.Google Scholar
  37. Winter, D.; Courtney, K., (2001). From here to eternity: recycling Hi-tech junk. Waste Age, 32(3), 186–190 (5 pages).Google Scholar
  38. Wu, J.; He, Ch., (2010). Experimental and modeling investigation of sewage solids sedimentation based on particle size distribution and fractal dimension. Int. J. Environ. Sci. Tech,. 7(1), 37–46 (10 pages).Google Scholar
  39. Zhang, S.; Forssberg, E.; Menad, N., (1998). Metals recycling from electronic scrap by air table separation-theory and application. In: The TMS Annual Meeting: EPD Congress, San Antonio, USA 16–19 Feb.Google Scholar
  40. Zhang, Z. X.; Dong, Z. N., (2004). Viscous fluid mechanics. Tsinghua Univ. Press, Beijing, China.Google Scholar
  41. Zhao, Y. M.; He, Y. Q.; Duan, C. L.; Zuo, W. R.; Wen, B. F., (2008). Simulation and application of the active pulsing air classification. in: Proceedings of the 11 th International Mineral Processing Symposium. Belek-Antalya, Turkey 11–14 Oct.Google Scholar

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© Islamic Azad University 2011

Authors and Affiliations

  1. 1.School of Chemical Engineering and TechChina Univ. of Mining and TechXuzhou, JiangsuChina
  2. 2.College of EngineeringUniversity of KentuckyUSA

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