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73 巻, 834 号
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西岡 多三郎1957 年 73 巻 834 号 p. 855-860
発行日: 1957/12/25
公開日: 2011/07/13
ジャーナル フリーMost of the wire ropes which are used in coal mine are 6 strands 7 wires ropes and which are used in metal mine are 6 strands 19 wires ropes. To the deterioration of the former I have already published, so in this paper I will state the method for deducing the breaking strength of the latter and its example.
In this method too, the forms of deterioration of wire ropes are classified into the following five items:
A: Abrasion, B: Broken wire, C: Corrosion, D: Deformation, E: Eccentricity etc, Deducing the percentage loss of strength individually for each items, then sum up and determine the loss of strength of this deteriorated wire rope.
This method can be applied fo 6 strands 19 wires Lang's fay ropes, which originally comply in all respects with Japanese Industrial Standard (i.e. JIS) with proper central core.
It is confirmed by testing the deteriorated ropes that this method is more accurate than the deducion by feeling which was being used up to now.抄録全体を表示PDF形式でダウンロード (10631K) -
山田 正幸, 馬場 文夫1957 年 73 巻 834 号 p. 861-865
発行日: 1957/12/25
公開日: 2011/07/13
ジャーナル フリーIn the most recent we have been interested in keep away from an explosion accident by the misfired detonstors. In this paper we shall report on the electronic metal detection.
The metal detector is build around some form of mutual-inductance bridge employing a symmetrical coil arrangement which is bed by a suitable oscillator. The presence of a metallic particle in the A. C. electro-magnetic field which links the coils disturbs the original field pattern for which the bridge was balanced. The resulting bridge unbalance current is amplified and made to operate a warning or rejection device.抄録全体を表示PDF形式でダウンロード (5651K) -
弱磁性鉱物の張磁場磁選に及ぼす強磁性鉢物の影響八嶋 三郎1957 年 73 巻 834 号 p. 867-872
発行日: 1957/12/25
公開日: 2011/07/13
ジャーナル フリーIn this report as the continuation of-report 1, 2 and 3, the author studied the effect of ferromagnetic iimpurities to the separation of weak magnetic minerals in a strong magnetic field. To ascertain the above effect, some numericalcal culations concgming the magnetic properties of locked particle consisting of garnet and magnetite were carried out. Then the above results were experime-ntally discussed by using actual results. of separation. The results obtained were shown in Fig. 1 and 2. In these considerations the author assumed that the mineral possesses pure component and uniform characteristics. While in the case of natural mineral which treated in the ordinary magnetic separation it doesn't always possesses uniform characteristics even if it presents comperatively high grade. The experimental results concerning the ilmenite concentrates were shown in Fig. 5 and 7. In spite of their high grade, it was recognized that they show magnetically wide distribution.
In addition with the above experiments, the boundary between magnetic separation employing weak magnetic field and of strong magnetic field was discussed.抄録全体を表示PDF形式でダウンロード (1281K) -
1957 年 73 巻 834 号 p. 872
発行日: 1957年
公開日: 2011/07/13
ジャーナル フリーPDF形式でダウンロード (164K) -
CO, H2混合ガスによる還元について中沢 元一, 照沼 清1957 年 73 巻 834 号 p. 873-878
発行日: 1957/12/25
公開日: 2011/07/13
ジャーナル フリーEffects of gas composition, gas velocity and particle size on reduction rate, the dissociation of CO during reduction and kinetics of reduction have been studied.
The reduction rate increased remakably with the reducing gas contained over 25% H2. In case of H2 40%, CO 60% mixture, the complete reduction was obtained at 950°C for 2 hours in ilmenite and at 900°C for 2 hours in titaniferous iron sand.
The particle size-should be prepared under 100 mesh in ilmenite and under 80 mesh in titaniferous iron sand.
The influence of gas velocity was studied in the reduction of ilmenite with H2 40%, CO 60% mixture. When it exceeded over 1.32cm/sec at 950°C, it had little effect on the reduction rate.
The dissociation of CO during reduction was recognized markedly at 400-700°C in titaniferous iron sand, but in ilmenite it was not at all.
At first the reaction was the 1st order type, approaching the complete reduction diffusion took the rate controlling step.
While activation energies were almost the same in the reduction of ilmenite with H2 100%, CO 100% and H2 40%, CO 60% mixture, the reaction velocity constant of H2 100% was 8 times as large as of CO 100% and twice of H2 40%, CO 60% mixture.抄録全体を表示PDF形式でダウンロード (1039K) -
久島 亥三雄, 天沼 凉1957 年 73 巻 834 号 p. 879-883
発行日: 1957/12/25
公開日: 2011/07/13
ジャーナル フリーWe studied on the formation, constitution and micro-structures of Ca-ferrite byc hemicaland X-ray-analysis and microscope. Main results obtained are as follows. 1). Ca-ferrite has two kinds of form, CaO · Fe203 and 2CaO·Fe203. 2). CaO · Fe203 forms over 700° and 2CaO · Fe203 over 1, 000°C, the former melts at 1, 220°C and dissolved by hot 1: 1 HCI, and latter melts at 1, 280°C and easily dissolved by cold dil HCI, and they have both paramagnetic property. 3). CaO · Fe203 dissolves a few amount of Fe203 at high temperature. 4). CaO · Fe2O3 forms hexagonal crystals near its melting point, and shows the growth steps.抄録全体を表示PDF形式でダウンロード (6687K) -
1957 年 73 巻 834 号 p. 885-898
発行日: 1957/12/25
公開日: 2011/07/13
ジャーナル フリーPDF形式でダウンロード (17220K)
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