<報文>洗炭工場に於ける微粉炭の囘收法について(第1報)

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  • センタン コウジョウ ニ オケル ビフンタン ノ カイシュウホウ ニ ツイテ 1
  • <Original Papers>Recovery of Fines from Wash Water at a Coal Washing Plant

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The result of the inspection at 11 plants shows that the amount of fines lost in the effluent water from a washing plant is estimated to be 3.4 per cent of the washed coal and the ash contents of the lost fines to be 25～45 per cent, 35 per cent on an average. As the first step to establish the method to catch them, some surveys were made to know the actual settling conditions in the settling tank with a scraper called Bache or Bacher settling tank at 3 washing plants in Hokkaido. Samples were taken from some points in the tank different in lateral and vertical distances and their pulp densities were measured. It was found that the general progression of settlement of the fines from the feeding point to the discharge point was very slow and that the Bacher tank was not a slime settler but was a deslimer. To settle the fines some other means must be adopted. The results of the sizing analyses of the samples taken will be discussed in next issue.

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