<報文>重液選鑛及び選炭法の適用性に關する研究(第1報) : コーン型分離機による選炭試驗
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概要
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In our country, dense-media coal cleaning processes have been in operation experimentally or partially in various places. But in case of industrializing the project, we are considerably perplexed over questions of deciding the type of separator, the kind of medium, the flow sheet, and other necessary items, because of the lack of thorough understanding of the engineering fundamentals of these relatively new processes. The authors and their collaborators carried out previously fundamental studies on dense-media separation of ores and coals and published some parts of the results obtained. In the present tests, the continuous separator with 2-foot cone was developed at the Mineral Dressing Laboratory of the Research Institute of Mineral Dressing and Metallurgy, Tohoku University, in collaboration with the Ashio Engineering Works, Furukawa Mining Co., Ltd. and was installed in the Pilot Plant of the Institute in August, 1950,and its performance and condition of operation were examined. Several kinds of coal from Kyushu and Tohoku districts were treated and the results of separation, stability, contamination and reclamation of medium, and treatment of undersize from the feed screen were investigated. Magnetite and iron sand were used as media. The magnetite medium was of specific gravity, 5.02,iron content, 62.6%, <200-mesh fraction, 75% or 57%. The iron sand medium was of specific gravity, 5.10,iron content, 69.52%, and <200-mesh fraction, 79%. The chief troubles during operation were : stoppage of the roll feeder gate, breakage of springs and loosening of driving shaft of the Zimmer screen, stoppage of rate of the separatory cone, stoppage of air lifts, and inability of the sand pump. The intensity of agitation by the rake in the separatory cone was 120cm^2/sec^3 after Buche's index. The maximum acceleration of the vibration of Zimmer screens was 2,690cm/sec^2 and 2,774cm/sec^2. The circulation of medium was about 200% of the cone volume per min. The minimum value of the difference of specific gravities of the medium between top and bottom of the cone was 0.08 for iron sand, less than 0.01 for magnetite. It was felt that the difference of specific gravity was markedly affected by the amount of the fraction coarser than 100 mesh. The degree of contamination of medium varied with the nature of feed coal and the duration of operation. When 100kg of feed coal was treated, the amount of contamination was in the order of 1-6% of the feed coal. When the amount of contamination of coarser coal was increased, the stability of the medium was greatly decreased. When 100kg of feed coal was treated, the amount of magnetite circulating in the reclamation system as the diluted medium was 3-4% of the feed coal and that of iron sand was 4-10%. The recovery of magnetic content of magnetite medium by means of Davis' magnetic tube tester was over 98%, corresponding to the loss of 5-52g of magnetic content per ton of feed coal, under the field strength of 1,120 gauss. It was found that a perfect recovery of iron sand by means of magnetic separation was difficult in the present tests. By the float-and-sink tests of clean coal and refuse, it was found that the amount of sink in clean coal was 0.65-1.83% of feed coal and that of float in refuse was 0.16-0.76%. When the amount of total misplaced material was plotted against the amount of ±0.1 specific gravity distribution of the feed coal, the relation was expressed by a straight line on a log-log scale. After Lyons' correlation theory, the comparative effectiveness of separation obtained in the present tests could not compete with that of Tromp or Chance, but it was comparable to Link-Belt, Ridley-Scholes, or Jeffrey Baum jig with bone medium. It was found that 47-68% of combustible matter was recovered by tabling <2.4mm-undersize of the feed coal of average quality, whereas <2.4mm-undersize of the feed coal of good quality required no further treatment.
- 東北大学の論文
- 1953-09-10
著者
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