北松炭礦選炭工場における精選の実施について
1955 年 71 巻 807 号 p. 467-471
詳細
1955 年 71 巻 807 号 p. 467-471
After the second War, in Japan; low-ash gas coal has been required by customers under the influence of imported American coal. But it was difficult to produce the low ash coal by ordinary washing processes from high-ash raw coal. Then the problem of cleaner jig rose, which is equipped after the main jig to wash again the cleaned coal.
After our inquiries into results of practial washing operation in jigs, it was found out that the highest jigging, efficiency is gained when the discharge of refuse from each cell is less than 30%.
Since 1954 new cleaner jigs have been successfully operated in washing plants at Shikamachi and Yatake mine successfully. But in operation, it is necessary to use jig beds consisting of feldspars or artificial stones. And it is also desirable to furnish the cleaner jig with the regulators of air pulsation for better operation.
