巻号一覧
67 巻, 760 号
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村岡 貞勝1951 年 67 巻 760 号 p. 489-498
発行日: 1951/10/25
公開日: 2011/07/13
ジャーナル フリーIn the former days, the Hitachi Mine Mill produced. low grade cupriferous pyrite concentrates chiefly by hand picking and gravity concentration. It is true that differential flotation of copper and iron pyrite had been also performed but only on a small scale. By this method of operation, the mine gained much profit for a long period.
However in recent years, this method was found unprofitable for various reasons such as high smelting expenses of bulk concentrates.
Hence, in order to produce more enriched copper concentrates and greater amount of iron pyrite, the mine planned to alter the old system of concentration to all flotation by June, 1948.
In the newly reconstructed plant, heavy media sink-float process is adopted prior to flotaiion and most of the old type equipments have been replaced by more efficient and mechanized ones.
The reconstruction works, were for certain reasons, delayed and completed in March, 1950.
The result obtained during March 1951 in this new plant is as follows:Crude Ore 23, 579 metric tons Assay % Cu 1.19
S 17.51
Corrper Concent- 1, 79 metric tons Assay % Cu 14.08
rate S 38.00
Pyrite Con- 7, 007 metric tons Assay % Cu 0.22
centrate S 44.70
Sink-Float 5, 289 metric tons Assay % Cu 0.12
Tailing S 3.0
Flotation 9, 504 metric tons Assay % Cu 0.07
Tailing S 1.63
The completion of this mill reconstruction has, once again, mede the operation of mine profitable.抄録全体を表示PDF形式でダウンロード (2089K) -
賀来 秀三, 関 義辰1951 年 67 巻 760 号 p. 499-505
発行日: 1951/10/25
公開日: 2011/07/13
ジャーナル フリーAs a safety measure in regard to mine waste dams, hitherto we have prospected the water centents, the place of saturated water line and the condition of dewatering and solidifying df slime etc., by well sinking or boring.
In place of those methods, we studied the application of the electrical prospecting method.
(1) The mine waste changes effectively its electrical and mechanical properties with grain size and water contents.
(2) The mine waste has various conditions of dewatering which depend upon its grain size.
(3) The electrical resistioity of water in the mine waste depends upon the ionic concentration and mobility of dissolved salts in solution.
(4) The electrical conductioity of the mine waste due mostly to the conductivity of capillary water.
(5) The relation between the electrica conductioity and water contents of the mine waste is as follows:
where λs is the specific conductivity of the mine waste,
λω is the specific conductivity of water in the mine waste,
υω is the volumetric percentage of water in the mine waste
and α in the average length of water capillary tube in the mine waste at unit length.
From the above results, we find that the condition in the mine waste dam can be presumed by the electrical prospecting method. Thirteen mine waste dams of Taihei Mining Co. are being prospected by this method.抄録全体を表示PDF形式でダウンロード (1003K) -
浸水の徴候と之が経過岩沢 栄1951 年 67 巻 760 号 p. 507-511
発行日: 1951/10/25
公開日: 2011/07/13
ジャーナル フリーPDF形式でダウンロード (1126K) -
芝野 徹阿1951 年 67 巻 760 号 p. 513-516
発行日: 1951/10/25
公開日: 2011/07/13
ジャーナル フリーIn these experiments the effects of temperature and chlorine, both on the current efficiency and the lead content of the deposited zinc, were studied, and the results obtained are as follows
1) In pure solution, as the temperature is raised from 25°C to 60°C, the current efficiency is increased from 92% to 96%, and this tendency is also held in the case of electrolyte containing 40mg/l chlorine.
2) In these two kinds of solution, the lead content of the deposited zinc were not effected materially by the solution temperature up to about 40°C, but when it was raised from 50°C to 60°C, the amount of lead was considerably increased.
3) In the electrolysis at constant temperature 35°C, it was found that the current efficiency and the lead content of cathode zinc were not materially affected by the presence of chlorine up to about 20 mg/l.
4) The temperature effect is more remarkable than that of chlorine.抄録全体を表示PDF形式でダウンロード (792K) -
吾妻 潔1951 年 67 巻 760 号 p. 517-522
発行日: 1951/10/25
公開日: 2011/07/13
ジャーナル フリーPDF形式でダウンロード (1398K) -
1951 年 67 巻 760 号 p. 523-529
発行日: 1951/10/25
公開日: 2011/07/13
ジャーナル フリーPDF形式でダウンロード (6208K)
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