巻号一覧
48 巻, 571 号
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山口 吉郎1932 年 48 巻 571 号 p. 1095-1118
発行日: 1932/11/22
公開日: 2011/07/13
ジャーナル フリーIn this paper the fundamental tests of coal and its washability are dealt with, under three big headings, namely, sizing tests, washability tests and X-ray examination.
Size of coal affects greatly both a washing method to be adopted andselling price of coal. Thus the sizing tests on run of mine coal and the crushedproducts of middlings, if any, are primarily important.
Under the second heading, first the author describes the purity of coal with some discussions, and secondly the methods of float and sink tests and Henry tube tests fully, with characteristics of the washability curves and their construction.
In the third heading the evolution of X-ray examination in connection with coal dressing is explained. Studies of coal by X-ray have been made chiefly by C. N. Kemp, W. Mc Laren, J. L. Thomson, and recently by H. Winter. They intended the scientific control of coal washing by the combined application of ash-characteristic curves and X-ray examination.
This paper is intended to assist those, so as to give guidance in the examination of coal with a view to selecting a suitable cleaning plant, and in the operation of such a plant.抄録全体を表示PDF形式でダウンロード (3076K) -
高桑 健1932 年 48 巻 571 号 p. 1119-1138_2
発行日: 1932/11/22
公開日: 2011/07/13
ジャーナル フリーAfter discussing ways hitherto given by several authorities to denote the efficiency for cleaning coal, the Author proposes the following formula as the practical and reasonable expression:
Efficiency for cleaning coal in%=WWc/Oc,
where W=%by weight of concentrates yielded raw coal basis, Wc=%of standard coal in concentrates, Oc=%of standard coal in raw coal.
The standard coal is that portion which floats on a solution of standard specific gravity.
As there existsthe difference of degrees of difficulty in cleaning coal, the author proposes toconsider at the same time the degree of cleaning difficulty, denoting it in the following expression:
Degree of Cleaning Difficulty, =Oa-Pa/Ca-Pa,
The clean coal means the portion of raw coal which floats on a solution of 1.35 specificgravity. Some practical examples for degree of cleaning difficulty are given andalso the cleaning difficulty in the case when middlings are yielded or after-cleaning are executed, is investigated.抄録全体を表示PDF形式でダウンロード (4787K) -
高桑 健1932 年 48 巻 571 号 p. 1139-1154_6
発行日: 1932/11/22
公開日: 2011/07/13
ジャーナル フリーIn the first part the Author proposes the following notes to denote the finenessof particles in products treated in mineral dressing:-For example a product shows the following results for screen analysis by Tyler sieves;
Mesh.-3 -6 -10-20 +3 +6 +10 +20 +35 -35 No.of grades 6 16·7 399 17·9 16·84·9 3·8 total 100%
Then sizes of particles, amount of each sized products, number of grades areexpressed as 16·7 3T356 3·8 and the mean size of particles in a product is calculated as Mean size= (10×16·7+5×399+25×17·9+1·25×16·8+0·625×49×0·313×3·8)÷100=4·37mm., where 10, 5, 2·5, etc. are mean sizes of screened products respeotively in mm.
In the second part, on the classified products of coal obtained from the hydropneumatic table designed by the Author the character of agitation ratio(ratio of mean size of coal particles to that of refuse in a classified product) are discussed.抄録全体を表示PDF形式でダウンロード (6471K) -
兒玉 八郎1932 年 48 巻 571 号 p. 1155-1178
発行日: 1932/11/22
公開日: 2011/07/13
ジャーナル フリーThis paper is the report of the cleaning test on Fushun fine coal by Peale-Davisair table performed at St. Benedict, Pa., U.S.A. in 1929.
We reached the conclusion that for the Fushun coal, the Peale-Davis system has not proven to be suitable device by following reasons.
(1) This system is not suitable for dusty as Fushun coal.
(2) Qualitative efficiency, by Drakeley's formula, is very low, viz, better cleaning performance can not be obtained.
(3) Very sensitive for variation of surface moisture.抄録全体を表示PDF形式でダウンロード (3756K) -
黒田 祝1932 年 48 巻 571 号 p. 1179-1196
発行日: 1932/11/22
公開日: 2011/07/13
ジャーナル フリーThe sand flotation for washing coal was designed originally by J. M. Chance. Theraw coal is fed into a conical separating chamber, which contains a mixture of sand and water, the sand being kept in suspension in the water by a revolving agitator. The clean coal floats near the surface of the fluid mixture and goes to the discharge point. The dirt sinks through the separating medium and falls through a classifying column into a refuse chamber.
The results of the trials of this machine are as follows:
1. It is preferable that the sand is silicious and less clayey.
2. The finer is the sand, the more uniform and stable becomes the suspension, but the minute particle is adsorbed or attached to the face or cleat of coal, and thus coal is spoiled. Moreover, if the sand is fine, the loss of sand results in.
3. River sand (-24 mesh) is used and obtained good results.
4. The density of the fluid in the chamber is variable as the depth, at the upper zone the specific gravity being 1.2, at the middle 1.8, and at the lower 1.4. The controlling of this kind is considerably difficult.
5. Capacity is comparatively large and the material treated is not broken in the course of washing.
6. The fine coal flows with the sand, this resulting in loss of coal.
In conclusion, Chance machine has some demerits, especially on Japan conditions, despite of many merits, and this is the reason why the machine cannot be used directly.抄録全体を表示PDF形式でダウンロード (2633K) -
三藤 万衛1932 年 48 巻 571 号 p. 1197-1202
発行日: 1932/11/22
公開日: 2011/07/13
ジャーナル フリーIn cleaning slurry as it is discharged from colliery washery, it is best first to eliminate valueless part from it, and then put it to cleaning processes, best suited for the purposes, advisably with upward stream of water.
With upward stream of water at the velocity of 1.5m.m./sec. a small portion of slurry only, aportion containing mixtures larger than 100 mesh in size, flows out. The flow-out part, if obtained with upward stream of water at the velocity of 0.2 m.m./sec.is hardly of any value, and to be saved from its interference cleaning would be made much easier, if this flow-out part is previously eliminated.
A continuously working simple apparatus, which concentrates slurry, and separates coals andclassifies them at the same time, fully explained and shown in motion with satisfaction.抄録全体を表示PDF形式でダウンロード (759K) -
國武 干城1932 年 48 巻 571 号 p. 1203-1211
発行日: 1932/11/22
公開日: 2011/07/13
ジャーナル フリーDie Bestimmung des Aschengehaltes der Steinkohle durch die Farbetonmessung gepulverter Probe mit dem Stufenphotometer, ist schon vor einigen Jahren von Prof. Dr.-ing. W. Gross in Breslau und seinem Mitarbeiter veröffentlicht worden.
Nach diesem Verfahren hat der Verfasser einige Abhängigkeitskurven-von Weissgehalt und Aschengehalt, und diejenigen von Weissgehalt und Heizwert der nach der Schwimm-und Sinkanalyse zur Fraktionen des verschiedenen Spezifischen Gewichtes zerlegten Steinkohlenprobe aus einigen Gruben im Chikuho Revier, ermittelt. Weiter hat er Einflüsse von Wassergehalt der Probe auf der Weissgehalt-messung festgestellt, und schliesslich hat er, nach der Messung von Weissgehalt der aus Wäscherzeugnisse genommenen Probe, die Bestimmung von Wirkungsgrad der Waschearbeit mit Hilfe der Eichkurven und Waschkurven, vorgeschlagen.抄録全体を表示PDF形式でダウンロード (1227K) -
毛利 英熊1932 年 48 巻 571 号 p. 1212-1249
発行日: 1932/11/22
公開日: 2011/07/13
ジャーナル フリーSince 1928, new coal washery was set to work at Kukioka in the Imperial Steel Works for the preparation of coking coal. The new plant is composed of two separate series of working; the first for cleaning main feed of coals which come from several collieries in Chikuho coal field, and the second for mixing coals from Matsuura and others. In the first plant, main washer is two sets of improved Baum jigs whose capacity is each 60 tons per hour, and retreating machine is improvedpiston jig of 15 tons per hour. In the second plant main washer is also Baum type and cleaner piston jig whose capacities are just same as before. Dewatering, mixing and crushing works are also arranged systematically in the new plant.
Now nearly 2, 000 tons of clean coals are transported daily to the new coking plant.抄録全体を表示PDF形式でダウンロード (4652K) -
選炭に關する事項山口 吉郎, 吉村 萬治, 山田 復之助, 石黒 爲次郎, 高桑 健, 日下部 義太郎, 前田 孝矩, 菅野 健三郎, 富山 太郎1932 年 48 巻 571 号 p. 1250-1262_5
発行日: 1932/11/22
公開日: 2011/07/13
ジャーナル フリーPDF形式でダウンロード (2825K)
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