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水平層과 傾斜層 掘折媒質에서 Blind Zone 問題에 관한 硏究
金得琪,高進碩 朝鮮大學校 動力資源硏究所 1981 動力資源硏究所誌 Vol.3 No.1
The blind zone problem in three-layered sections in which the velocities of the individual layers increase with depth of their layers are solved based on the time-term equations. Blind zones are spaces which exist at every recorded refractor. In the blind zones, the traval times cannot be recorded as first arrivals. Therefore, if a blind zone is not taken into consideration, large errors in calculated refraction depths may occur. The results of the blind zone solution are as follows : 1. A blind zone may be evaluated by defining an intercept time for a blind zone velocity. 2. Blind zone depth may be evaluated by using standard time-term equations for layer thickness and depths.
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方鉛鑛의 浮選에 있어 Cu^(2+)의 活性에 關한 硏究
金得琪,韓五炯 조선대학교 생산기술연구소 1981 生産技術硏究 Vol.1981 No.-
The plenty of Pb and, Zn ores are produced in our country. Pure minerals, however, are rarely produced because most of them deposit in complicated state of coexistence of sulphides galena and zincblende. In view of this state, it is dificult for them to be fleated. Therefore, activation of galena with copper ions and floatability of the copper-activated galena in the presence of sulfide have been investigated by means of adsorption measurements and floatation tests, in order to elucidate the floatation behaivor of galena in block ore. The results obtained areas follows: (1) Activation of galena with copper ions proceeds according to the following exchange reaction, PbS+Cu^(2+) = CuS+Pb^(2+) which is controlled by the parabolic rate law. (2) Copper activation leads to an increase of the galena floatability, which may be caused not by an increase of uptake of collector, but by an increase of the nactive floatability of galena. (3) In galena-sphalerite mixture suspension, copper ion is abstracted by galena in preference to sphalerite, but the floatability of sphalerite remakably increases with copper activation and galena can not be separated by depressing sphalerite with sodium bisulfite. (4) In this case, galena can be floated from sphalerite by depressing the latter with sodium bisulfite together with zinc sulfate after a suitable extent of copper activation.
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Molybdenum Di n-butoxy Dithio Phosphate의 경계윤활 특성
강용식,김득기,김원덕 중앙대학교 기술과학연구소 1988 기술과학연구소 논문집 Vol.18 No.-
Molybdenum di n-butoxy dithio phosphate as soluble lubricating oil additive for reducing wear and friction was investigate. The boundary lubricating effects of oil solutions of molybdenum di n-butoxy dithio phosphate, zinc di n-butyl dithio phosphate, and MoS(??) suspension compared through Timken and Four-Ball tests. As the results, the extreme pressure and antiwear properties of the solution of molybdenum di n-butoxy dithio phosphate was superior than the others. Also, the antioxidation and anti-corrosion effects for copper strip of oil added molybedenum di n-butoxy dithio phosphate was excellent especially.
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李昌伸,金淳昌,金鳳集,金得琪,徐東宇,梁海承,朴永錫,韓五炯 朝鮮大學校 動力資源硏究所 1982 動力資源硏究所誌 Vol.4 No.1
This study investigates the geological distribution of limestone formations in the Jangsung area, of Chunnam, and compares them with other rocks and calculates the reserves through drilling and chemical analysis of samples. The geographical coordinates of the surveyed area are 126˚45'-126˚52' longitude by 35˚15'-35˚22' latitude. Fieldwork was conducted for proposed claim Nos. 89, 101, 111, 113, 123, 124,134, 135, and 144, in Damyang quadrangle. The rocks of the area are meta sediments known as a crystalline schist system, including muscovite schist, metaquartzite and sericite schist which were intruded by granite gneiss of an unkown period and by dykes of the Cretacious Period. The strikes of the crystalline schist svstem are mainly in the direction of N30E tO N80E and dip north wesltwardly. The sampling was carried across the strike of limestone and ten survey-lines was selected. Two hundred samples were analyzed and the average grades were as follows: CaO 43.34%, MgO3.81%, SiO_(2) 12.52%, R_(2)O_(3) 2.02%, Ig loss 38.37%. Seventeen drill sites which had been drilled by the Koryo Cement Company were chosen across the strike of limestone, and the average grades of limestene and dolomite were as follows: SiO_(2) 14.17%, R_(2)O_(3) 2.27%, CaO 40.27%, MgO 5.63%, Ig loss 37.60%. The probable reserves were calculated on the basis of mined areas and drill sites. The total probable reserves is 5,558,856 □.
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