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김수식,주목호우위문,좌백웅조 대한금속재료학회(대한금속학회) 1967 대한금속·재료학회지 Vol.5 No.3
Chlorination processes of the oxides of main values contained in monazite, that is thorium, cerium, lanthanum and yttrium, were clarified by thermobalance method. The results indicated that the chlorination process is affected by the dehydration temperature of the hydrous oxide. On the chlorination of the oxides, the influence of a kind of carbonaceous materials was also examined; and the result showed that active carbon, sugarcoat were effective and graphite was not suitable.
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김수식,주목호우위문,좌백웅조 대한금속재료학회(대한금속학회) 1967 대한금속·재료학회지 Vol.5 No.3
Dehydration processes of the hydrous oxides of thorium, lanthanum and yttrium obtained by addition of ammonium hydroxide to the chloride solutions were examined by thermogravimetric, differential thermal and x-ray diffraction analyses. It was observed that the hydrous oxides of thorium, cerium and yttrium were amorphous and belong to the group of aquated oxides, and hydrous oxide of lanthanum was lanthanum tri-hydroxide. The tri-hydroxide is dehydrated according to the process, La(OH)₃, 270℃ LaOOH 680℃ La₂O₃.
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김수식,주목호우위문,좌백웅조 대한금속재료학회(대한금속학회) 1968 대한금속·재료학회지 Vol.5 No.4
There has been no fixed opinion on the behavior of phosphate in chlorination of monazite. To obtain fundamental information on the behavior of phosphate in chlorination of monazite, thermodynamic considerations on chlorination of calcium phosphate were made, and phosphoric chlorides obtained by chlorination of the phosphate under various conditions were examined using a mass spectrometer. The results showed that phosphorous oxychloride was formed at 500˚, 600˚and 700℃, and both phosphorous oxychloride and phosphorous trichloride were formed at 800˚and 900℃. It is concluded from the results mentioned above that, in chlorination of monazite, phosphorous oxychloride is formed at low temperatures, and both phosphorous oxychloride and phosphorous trichloride are formed at high temperatures.
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Monazite 의 염소화 및 얻어진 유용성분의 혼합산화물의 염소화
김수식,주목호우위문,좌백웅조 대한금속재료학회(대한금속학회) 1968 대한금속·재료학회지 Vol.5 No.4
Based on the results described in Part 1, 2 and 3, the optimum condition for recovering thorium and so-called rare earths from Korean monazite was determined, using a horizontal tube electric furnace. When the monazite was decomposed with chlorine at 700℃ using the -200 mesh monazite and charcoal respectively, the weight ratio of charcoal to monazite 0.2, the size of briquette 6-10 mesh, and a chlorine flow race 430cc/min, thorium and so-called rare earths were obtained with high recovery. And it was observed that chlorides of thorium and Yttrium may be selectively volatilized, when the monazite was decomposed at about 900℃. With the mixed oxides of thorium and so-called rare earths obtained by wet process from the chlorides prepared by chlorination of the monazite at 700℃, selective separation of the values was examined by chlorination method. The results showed that lanthanum, cerium and thorium were selectively separated to an extent by the chlorination at about 200℃.
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김수식,주목호우위문,좌백웅조 대한금속재료학회(대한금속학회) 1968 대한금속·재료학회지 Vol.5 No.4
Decomposition of gaseous thorium tetrachloride with oxygen was examined. It was observed that ultra fine particle of thorium oxide was obtained by this method.
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탄소 존재하에서 이산화황에 의한 함티탄 자철광의 황화반응(1)
이철태,유영홍,최한석,좌백웅조 한국화학공학회 1983 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.21 No.3
탄소 존재하에서 이산화항을 황화제로 한 함티탄자철광의 황화반응에 대하여 연구하였다. 본 연구에서는 반응온도, 반응시간, 함티탄자철광에 대해 첨가되는 탄소의 무게비, SO₂ 가스의 유량 그리고 함티탄 자철광의 입도 등의 변수가 황화반응에 미치는 영향을 검토하였다. 또 황화된 함티탄자철광으로부터 합성 rutile을 제조하고자 하였다. 본 황화반응의 적당한 반응조건은 반응온도 : 800℃, 반응시간 : 1h, 함티탄자철광에 대해 첨가되는 탄소의 무게비 : 0.7, 함티탄자철광의 입도 : -150 mesh, SO₂ 유량(반응관크기 : 내경=2.8㎝, 길이=100㎝) 100㎤/min였으며 황화된 반응물을 1M HCI로 침출하여 제조된 합성 rutile은 X-선회절분석 결과 rutile임이 확인되었으며 이의 함량은 82.15% TiO₂로 나타났다. The sulfidization of titaniferous magnetite(Soyonpyongdo, Korea) with sulfur dioxide in the presence of carbon was studied. The study of this reaction included reaction variables such as reaction temperature, time, weight ratio of added carbon to titaniferous magnetite, flow rate of sulfur dioxde, and particle size of titaniferous magnetite. An attempt was made to produce systhetic rutile from titaniferous magnetite by the sulfidization. The optimum conditions for the reaction were that reaction temperature was 800℃, reaction time, 1h, weight ratio of added carbon to titaniferous magnetite 0.7, particre size of titaniferous magnetite -150mesh, and SO₂ flow rate (reactor size: ID = 2.8㎝, length = 100 ㎝)100 ㎤/min. The synthetic rutile prepared by leaching the sulfidized product with 1 M HCI was identified as rutile by the x-ray diffraction analysis and was found to contain 82.15% TiO₂.
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