New sink-float testing apparatus using magnetic fluid for coal particles.

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  • 磁性流体を用いた石炭粒子の浮沈試験装置
  • ジセイ リュウタイ オ モチイタ セキタン リュウシ ノ フチン シケン ソウ

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The development of an improved sink-float testing apparatus us-ing a water based magnetic fluid and electromagnet for coal preparation has been discussed. The apparent density in the magnetic fluid can be regulated easily from 1200kg/m3 to 2200kg/m3 for coal analysis by controlling the current of the electromagnet. Therefore, it is possible to carry out the separation with a single cell and tested coal products need no washing for subsequent separation. Also the viscos-ity of the magnetic fluid is as low as 0.01Pa·s even at an apparent density of more than 2200kg/m3. The water based magnetic fluid used is non-toxic and does not react chemically with organic substance or inorganic impurities within the coal samples. The smeared water based magnetic fluid on the separated coals could be removed easi-ly by washing with water. The washed magnetic fluid, which became diluted, is con-centrated and returned to the separation cell.

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