煤炭工程 ›› 2022, Vol. 54 ›› Issue (4): 172-175.doi: 10.11799/ce202204031

• 研究探讨 • 上一篇    下一篇

重介质干扰床的分选效果研究

牛祯   

  1. 中煤天津设计工程有限责任公司
  • 收稿日期:2021-05-11 修回日期:2021-06-26 出版日期:2022-04-15 发布日期:2022-07-06
  • 通讯作者: 牛祯 E-mail:307462025@qq.com

Study on the separation effect of heavy-medium interference bed

  • Received:2021-05-11 Revised:2021-06-26 Online:2022-04-15 Published:2022-07-06

摘要: 在较低的床层密度下,干扰床的精煤分选效果不佳。为了提高干扰床分选机的分选床层密度,增强按密度分选的作用,进而提高干扰床分选效果,研究了干扰床层添加重介质的分选效果,分析了干扰床层内密度变化和干扰床层内Hδ50位置,并进行了变径重介干扰床实验。结果表明,添加重介质前,床层的平均密度和分选密度分别为1.18g/cm和1.46g/cm,添加重介质后分别为1.295g/cm和1.45g/cm|添加重介质后精煤产率提高2.36百分点,精煤灰分降低0.17百分点|干扰床内,随着高度的增加床层密度逐渐降低,密度越高降低速率越大|随着密度增加,Hδ50升高,干扰床床层密度的梯度场变化增加,密度稳定性变差,Hδ50波动增大|变径干扰床分选效果优于普通干扰床。

关键词: 干扰床分选, 床层密度, 重介质, 入料粒度比

Abstract: The principle of interference bed and the best range of feed size are introduced. The analysis shows that increasing the bed density and decreasing the rising water flow rate can enhance the function of density separation, and then improve the separation effect of interference bed.Adding heavy medium into the interference bed can increase the bed density, significantly improve the clean coal index, and greatly improve the separation effect.

Key words: interference bed, density, heavy medium, feed size ratio, Hδ50

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