Fine coal and three product dry beneficiation with vibration and double-density fluidized beds

Abstract

The fluidizing performance and density uniform stability of vibration fluidized beds were analyzed. The experimental results in 2000 mm×80 mm×200 mm model apparatus show that the vibration fluidized bed can efficiently separate fine coal of size 6–0.5 mm, the beneficiation lower limit is 0.5 mm, the E_p value is 0.07. A double-density fluidized bed was formed by which the bed structure was specially designed with a pyramidal part. It can efficiently turn out three products according to densities in a fluidized cascade. The suitable range of gas flow rate is 4.4–4.6 m³/h. In the lighter area, the separation density is around 1.49 g/cm³, and E_p value is 0.06. In the denser area, the separation density is about 1.85 g/cm³, and E_p value is 0.07.

Keywords

dry beneficiation / vibration fluidized bed / three-product separator

References

[1] GeldartD. Types of gas fluidization. Powder Technol, 1973, 7: 285-292

[2] GranfieldR R. Solids mixing in fluidized beds of large particles. A I Ch E Symp Ser, 1978, 74(176): 54-59

[3] GeldartD, HarnbyN, WongA C. Fluidization of cohesive powders. Powder Technol, 1984, 37: 25-37

[4] GeldartD, WongA C. Fluidization of powder showing degrees of cohesiveness. Chem Eng Sci, 1985, 40: 653-661

[5] LinJ S, ChenM M, ChaoB T. A novel radioactive particle tracking facility for measurement of solids motion in gas fluidized beds. A I Ch E J, 1985, 31: 465-473

[6] Chen Q R, Wei L B, Liang C C. Three-product separator with double-density-air-dense media fluidized beds. Chinese Patent ZL, 96231636. 9. April 10, 1996

[7] RyzhkovA F, KipnisI E. Engineering methods of analysis of devices with a vibrationally fluidized bed. J Eng Physics, 1991, 60: 687-692

[8] HasataniM, ItayaY, MiuraK. Drying of granular materials in a inclined vibrated fluidized bed by combined radiative and convective heating. Drying Technol, 1991, 9: 349-366

[9] WeiL B, ChenQ R, ZhaoY M. Study on the double-density fluidized bed. J Basic Sci & Eng, 1996, 4: 275-279(in Chinese)

[10] WeiL B. Segregation and mixing of two types of particles in airdense media fluidized beds. The Chinese J Nonferrous Metals, 1997, 7(Suppl.3): 7-9(in Chinese)