尾太選鉱場の建設について
1955 年 71 巻 807 号 p. 561-568
詳細
1955 年 71 巻 807 号 p. 561-568
The mill of the Oppu Mining Company is located about 30 kilometer west of Hirosaki, Aomori Pref. This mill is built for the treatment of a complex copper-lead-zinc ore, which is transported from the mine by an aerial tramway some 6 kilometer in length. The mill consists of a crushing plant and a grinding-flotation plant, the latter is a modern fireproof building covering an area of 45.5m by 23m and is 16m high. The plant construction was started in May 1953 and was put in operation in Dec. 1953. The capacity is 200tons per day.
The average ore contains about 0.9% Cu, 2.2% Pb, 3.8% Zn, and 10.0% S. The principal metallic minerals in the ore in order of their abundance are pyrite, sphalerite, galena, and chalcopyrite. This mill treats such a complex ore by conventional differential-flotation method, and produces a copper concentrate of 20% Cu, a lead concentrate of 75% Pb, a zinc concentrate of 57% Zn, and a pyrite concentrate of 48% S. The average recoveries are about 84% of the copper, 90% of the lead, 86% of the zinc, and 51% of the total sulphur, respectiVely.
