巻号一覧
7 巻, 3 号
選択された号の論文の14件中1～14を表示しています
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北川 二郎1957 年 7 巻 3 号 p. 1-8
発行日: 1957/05/31
公開日: 2008/10/30
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斎藤 勝次1957 年 7 巻 3 号 p. 9-14
発行日: 1957/05/31
公開日: 2008/10/30
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竹本 実1957 年 7 巻 3 号 p. 15-25
発行日: 1957/05/31
公開日: 2008/10/30
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杉山 昇1957 年 7 巻 3 号 p. 26-31
発行日: 1957/05/31
公開日: 2008/10/30
ジャーナル フリーIn order to find out in what form the titanium present in red mud in Bayer alumina process, various titanium oxides were treated with alkali-solution at a high temperature.
The results obtained are as follows:
1) When titanium dioxide is treated with caustic soda solution, it makes a precipitate and the chemical constitution of the precipitate is approximately corresponding to Na2O•6TiO2•7H2O.
2) When the reaction was made in the presence of Fe2O3, the product has more Na2O than that of Na2O•6TiO2•7H2O.
3) As a result of the reaction of Indian high-titanium bauxite to caustic soda solution, it was found that the titanium in the bauxite existed mainly in anhydride oxide form and when treated with less concentrated alkaline solution at a comparatively low-pressure as in the American Bayer Process, a small amount of Na2O was combined with TiO2.
4) It was also found that the amount of Na2O combined with TiO2 increased with more vigorous treatment conditions, eventually up to the amount corresponding to 6Na2O•TiO2•7H2O.抄録全体を表示PDF形式でダウンロード (669K) -
森 重敏, 石川 栄一, 清宮 滋1957 年 7 巻 3 号 p. 32-36
発行日: 1957/05/31
公開日: 2008/10/30
ジャーナル フリーFor the purpose of finding out the structure of sodium aluminium silicate present in red mud in Bayer Alumina Process, the compound, which were precipitated by means of the experimental reaction between the solution of sodium aluminate and sodium silicate under various conditions, were examined by chemical analysis and X-ray diffraction.
The following is the findings.
1) Sodium aluminium silicate precipitated at the room temperature has the same composition as Nepheline (Na2O•Al2O3•2SiO2), however it takes a form of hydrate.
Even if the other salts co-exist, these salts do not influence upon the composition of the precipitate.
2) When reaction is made under a higher temperature, these salts are combined with the precipitate and the precipitate takes the composition of Sodalite compound, 3 (Na2O•Al2O3•2SiO2)Na2X.
When there is no other salt, the precipitate takes the form of Hydroxy-Sodalite, 3 (Na2O•Al2O3•2SiO2)2NOH.抄録全体を表示PDF形式でダウンロード (614K) -
安立 一郎, 高橋 登希二1957 年 7 巻 3 号 p. 37-42
発行日: 1957/05/31
公開日: 2008/10/30
ジャーナル フリーSimple methods of measuring calcination degree of alumina in rotary-kiln have been studied and the two methods written below have been proposed.
One is the method to represent calcination degree by "hydrating-degree" as the authors call it, which is indicated by the amount of water required for hydration, the amount being measured by titrating free alkali with normal solution of hydrochloric acid, which is formed when sodium fluoride solution is added to amorphous aluminium hydroxide. This hydroxide is formed when water is chemically absorbed by calcined alumina according to its calcination degree.
The other is the method to use relative degree of calcination, calculated from the height-ratio d = 1.395Å and d = 1.375Å peaks in the intensity distribution curves obtained by X-ray Geiger counter.
Calcination degree could be obtained with satisffable ease and rapidity by either of the two methods described above.抄録全体を表示PDF形式でダウンロード (657K) -
浅野 静夫, 友弘 一郎1957 年 7 巻 3 号 p. 43-50
発行日: 1957/05/31
公開日: 2008/10/30
ジャーナル フリーThe fact that electric current produces magnetic field, and a live conductor undergoes a force in the field, is the fundamental law of electromagnetism.
In aluminium furnaces, extremely large direct currents are used, and the presence of magnetic fields is familiar to any experienced technician and worker. Recent experiences with large aluminium furnaces have indicated that electromagnetic forces are active to such an extent that the normal operation of the furnaces may be disturbed.
In our plant the theoretical analysis based on the fundamental laws of electromagnetism and the practical measurement with flux meter to evaluate these electromagnetic forces at various points in vertical spike type aluminium furnaces (capacity 50KA) are attempted, and their effects on metal level are investigated experimentally.
Results obtained are as follows:
(1) In the tendency of force distribution in aluminium furnaces, the result of calculation resembles the measured value, although the problem is so complicated that it does not lend itself to precise calculation.
(2) The fact that the difference between the highest and the lowest position of the metal level has attained about 50mm, notwithstanding of the common distance between anode and metal of 50mm, is worthy of note.抄録全体を表示PDF形式でダウンロード (750K) -
下城 春雄, 平岡 高弥, 清水 栄三1957 年 7 巻 3 号 p. 51-59
発行日: 1957/05/31
公開日: 2008/10/30
ジャーナル フリーIt is well known that gasses involved in molten metal can be removed from the melt only by holding without any special treatment such as chlorination or nitrogen gas blowing in.
To make a scientific study of this problem on commercially pure aluminium, gas content of the melt and the change of the gas cavity in c.c./100gr of each cast sample for various holding conditions were measured by the "Specific Gravity Method."
The results obtained are as follows:
Relationship between the holding time and gas cavity can be represented by v = V0e-kt, where v = gas cavity after t hours' holding, v0 = the same at the beginning of holding, and k = a constant.
It is presumed that the constant k has nothing to do with holding temperature, but depend on the deapth of the melt; an empirical formula is obtained as follows:
k=3.1247•105•h-2.2182 (h being the deapth of the melt)抄録全体を表示PDF形式でダウンロード (1042K) -
永井 彰一郎, 大野 丈太郎, 米山 宏1957 年 7 巻 3 号 p. 60-64,81
発行日: 1957/05/31
公開日: 2008/10/30
ジャーナル フリーRaw materials used in this experiment are the magnesia obtained from sea water, and calcium silicide as reducing agent. The process is as follows. The magnesia and calcium silicide are ground and mixed, and the mixture is briquetted. When the briquetts are reduced in vacuo for several hours at high temperature, magnesium is distilled from the charge briquestts and condensed on a removable sleeve of the retort.
The authors have investigated the following items:
(1) Effect of reaction time.
(2) Effect of reaction tempetature.
(3) Effect of mol ratio.
(4) Effect of fluorspar.
(5) Effects of magnesia and calcium silicide particle sizes.抄録全体を表示PDF形式でダウンロード (664K) -
細井 吉一, 沢登 英一, 湯川 守1957 年 7 巻 3 号 p. 65-69
発行日: 1957/05/31
公開日: 2008/10/30
ジャーナル フリーThe annealing curve for the pure aluminium specimen extruded at high temperature is similar to that for cold worked aluminium.
The softening point changes more or less depending on annealing method, which is more remarkable in the case of the specimen extruded at lower-temperature.
By the investigation on hardness and electrial resistance of the specimens, it seemed that recrystallization took place during annealing, but on the other hand, from X-ray diffraction patterns and microstructure, it is difficult to say that recrystallization, i. e. nucleation and its growth, took place.
From the results of the experiment it is well explained that, when the specimen extruded at high temperature is annealed, polygonization takes place prior to softening, which in consequence grows and rotates to give a completely softened state in the specimen.抄録全体を表示PDF形式でダウンロード (1550K) -
(第2報)共存元素の影響潮田 豊沿, 吉村 修, 井上 重雄1957 年 7 巻 3 号 p. 70-75
発行日: 1957/05/31
公開日: 2008/10/30
ジャーナル フリーIn the previous report the authors reported the rapid determination method of Fe in the pure Al foil or Al-Fe mother alloy by using sulphuric acid as a dissolving agent.
In this method, the Fe in sample can be dissolved with sulphuric acid as Fe2+ state without using any reducing reagent, the reduced metallic Cu is filtered off, and the filtrate is titrated with standard potassium permanganate solution.
Interference of Ti or V in the determination of Fe in Al-alloy was reported by G. H. Osborn and W. Stross, whose method was as follows:
The sample was dissolved in sodium hydro-oxide solution, which was then acidified with dilute sulphuric acid. Reducing Fe3+ to Fe2+ with nickel powder the Fe was titrated with patassium permanganate. The details of the method, however, were not reported.
The present authors studied the interference of the presence of Ti, V, Cu, Cr and Sn in pure Al foil or Al-Fe mother alloy and the following results were obtained:
1. Fe in the pure Al foil.
The coexistence in small amount of less than 0.05%V, less than 0.6%Cr, and less than 0.05%Sn does not interefere, but the presence of large amounts of these elements gives positive errors.
The coexistence of less than 0.1%Ti gives no error, but approximatly 0.1-0.4%Ti gives negative errors, and the presence of Ti up to 1% positive errors.
2. Fe in the Al-Fe mother alloy.
The coexistence in small amount of less than 0.1%V and less than 0.6%Sn gives no error, but the presence of large amounts of these elements positive errors.
The presence of approximathy 0.4%Ti gives negative errors and up to 3.2%Ti gives positive errors.
The presence of Cu and Cr does not interfer with the determination of the Fe.抄録全体を表示PDF形式でダウンロード (699K) -
北野 幸雄, 秋山 和一, 秋山 吉夫, 尾崎 剛1957 年 7 巻 3 号 p. 76-81
発行日: 1957/05/31
公開日: 2008/10/30
ジャーナル フリーThe determination of sodium in aluminium by flame photometry linear extrapolation method and heat extraction method as well as that of nitrogen in aluminium by photometric method using Nessler's reagent have been studied. Results sammerized are as follows:
(1) The emission intensity curves of sodium in aluminium on the flame photometry were measured using electric recerder, and it was found that back ground intensity of sodium in 589mμ could be obtained by investigating those of 580 and 600mμ, and calibration curve of aluminium hydrochloric acid solution with varying amounts of sodium was linear at the range of 0 to 7ppm of sodium, suggesting that the linear extrapolation method in the determination of sodium in aluminium should be applicable.
(2) The heat extraction method as a simple method was discussed, and it was found that almost all amounts of sodium in shaving sample conld be extracted by reheating for five times at 950°C for 30 minutes.
(3) With Nessler's reagent photoelectric method for determination of nitrogen, the sample solution should be slowly poured in sodium hydroxide solution, and measurements should not be played untill a complete distillation of ammonia was observed.抄録全体を表示PDF形式でダウンロード (706K) -
竹内 勝治1957 年 7 巻 3 号 p. 82-87
発行日: 1957/05/31
公開日: 2008/10/30
ジャーナル フリーThe effects of mean stress on the fatigue properties of annealed and 50 per cent cold rolled commercially pure titanium sheets were studied on Schenck's vibrating sheet bending machine. The notch effects on the fatigue strength of annealed rods were studied on Ono's rotary bending machine.
Following results were obtained:
(1) The endurance limit diagram in bending is shown in Fig. 4. To construct a diagram, the experimental points under the mean stress are plotted along a line drawn through the complete reversal stress amplitude and the nominal tensile strength.
(2) The relation between theoretical stress concentration factor and fatigue strength reduction factor is shown in Fig. 6.
(3) In the case of 3.1 value of theoritical stress concentration factor, the fatigue strength reduction factor of annealed commercially pure titanium rod is approximately the same as that of 14S-T6 and 24S-T4 aluminium alloys.抄録全体を表示PDF形式でダウンロード (629K) -
1957 年 7 巻 3 号 p. 87
発行日: 1957年
公開日: 2008/10/30
ジャーナル フリーPDF形式でダウンロード (86K)
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