巻号一覧
67 巻, 752 号
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梶原 治1951 年 67 巻 752 号 p. 1-16
発行日: 1951/01/25
公開日: 2011/07/13
ジャーナル フリーSince having, engaed, in the management at Ogoya mine, in order to rationaige the management of the whole mine, which had been bitterly destroyed in and after the war time, the aurthor planned the following items:
1. To explore the undiscovered and undeveloped orebodlis.
2. To increase the efficiency of narrow-vein mining, and to prevent the country-rocks from intermingling to the useful minerals.
3. The mechanization of ore transportation.
4. To adopt. the heavy-media separation, and to recover the useful minerals.
5. To efficient smelting plant operation due to the high ratio concentration of the finol product of the dressing plant.
6. To assemble and simplify the operating plants and to make the. superintendence efficient.
These plants are now proceeding on their ways, especially among of them the fourth item was become necessary to realize as fast as possible and finally, it was accomplished in spite of many bad conditions.
Consequently, on account of the accomplishment of the heavy-media separation, the previous 10% copper concentrate, and 93% recovery of copper were elevated to 14% copper concentrate, and moreover the adoption of the differential flotation made the grade of copper concentrate to 18% and recovery of copper to 91%, and it made possible the separation of pyrite concentrate containing 45 to-47% sulphur.
To recover the zinc, we are now investigating its process. If this study may result in good success, the grade of copper concentrate will increase to 25%, and to recover pyrite and zincblende which. has been considered impossible will be economical and contribute so much to the rehabilitation of the mine.抄録全体を表示PDF形式でダウンロード (2594K) -
早瀬 喜太郎1951 年 67 巻 752 号 p. 17-20
発行日: 1951/01/25
公開日: 2011/07/13
ジャーナル フリーThe writer studied on iron sulphide in coals from Shiodakô, Yosliimakô, Sunagawakô, Kayanumakô, ôanikô and Miikekô.
By microscopic investigation and study of Debye-Scherrer's method the writer obtained the following results.
(1) Existence of marcasite is confirmed in the samples from 3 coal-mines among those from the above mentioned 6 coal-mines and Iwazakikô.
(2) Sometimes marcasite is not found microscopically, even though the macroscopic features of iron sulphide resembling fibrous or radial structure.
(3) Pyrite is recognized in all samples.
(4) Iron sulphide from 5 coal-mines show distinct forms, these are considered that iron sulphide filled the tissues of plants.
(5) The sequence of crystallization of the pyrite is considered to be sometimes earlier than the marcasite but the case is sometimes reverse.抄録全体を表示PDF形式でダウンロード (8284K) -
大森 五郎1951 年 67 巻 752 号 p. 21-28
発行日: 1951/01/25
公開日: 2011/07/13
ジャーナル フリーIt is the most important that let' the skinfriction due to the earth pressure on the peripfiery of the well be as small as possible, that is to say, let reduction efficiency by the air which is ejected in the ground and ascends along the outside wall of the well be max. For this purpose, position, distance, number of the air pocket, and pressure, capacity, of the air reservoir must be decided rationally. On the previous paper I described with the solution for the most important problem which is to be base in those rational decision.Successively, I described on this paper with the relations between the phenomenon of the air ejection and reduction efficiency of the skin friction by the compressed air in the range of P1≥{2/(γ+1)}-γγ-1ψ(dl) and calculated the expansioned volume of the compressed air in the ground, taking expansion in the air packets and on the ascending way for isothermal or adiabatic, and furthermore, from these calculations obtained theoretical reduction efficiency by the compressed air against the skin friction of the well.抄録全体を表示PDF形式でダウンロード (3886K) -
伊藤 尚, 柳ケ瀬 勉1951 年 67 巻 752 号 p. 29-32
発行日: 1951/01/25
公開日: 2011/07/13
ジャーナル フリーStudies on the separation and extraction of In from zinc smelting residue by sulphuric acid baking were carried out. A residue from Cd recovering process at Hikoshima smelter was used as the sample, which is composed mainly of Cd, Fe and In, amounting to 1.5%In.
The samples were firstly heated at 300°C with proper amount of sulphuric acid to facilitate sulfatization and then baked at 750°C. This rendered all of Cd water-soluble and the Fe and In, remaining insoluble. Cd-freed residues were again baked by sulphuric acid at 550°C followed by leaching with 0.1 N sulphuric acid. All of the In went into solution with only very small amount of the Fe. In short, the separation of Cd, Fe and In was accomplished nearly quantitatively by sulphric acid baking process.抄録全体を表示PDF形式でダウンロード (711K) -
1951 年 67 巻 752 号 p. 33-37
発行日: 1951/01/25
公開日: 2011/07/13
ジャーナル フリーPDF形式でダウンロード (3707K)
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