발간논문

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Results of the tests led to the following conclusions: (1) The optimum pH, at 25℃, ranges from 8 to 10 in soap flotation of the fluorite ore. (2) Fatty acids with higher iodine value than about 180 are powerful and selective collectors for fluorite flotation. (3) The highly unsaturated fractions of fish oil fatty acids are very effective collectors for fluorite. (4) Those acids having iodine values lower than about 180 are unsatisfactory for floating fluorite at 25℃, but both grade and recovery of concentrates are improved markedly at elevated temperature. (5) The effect of temperature on grade of concentrate was not marked with the highly unsaturated fatty acids, but fluorite recovery with these acids exhibited a very slight increase with increasing pulp temperature.

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The Sangdong Tungsten Mine in Korea produces molybdenite and bismuthinite as by products. The flotation of the above minerals has been done by means of differential oxidation of bismuthinite surface by heating. In this experiment, potassium dichromate is used as the depressor of bismuthinite at pH 6.0, and the results is summarized as follows: 1) Potassium dichromate is the effective depressor of bismuthinite in the acidic pulp. 2) The grade and recovery of molybdenite by the third cleaner flotation were 81 percent and 76 percent respectively, and the selectivity index was 10.9. 3) It was found that the operation cost of flotation can be cut down, and the recovery of molybdenite be improved as much as 20 percent more than that at Sangdoag Tungsten Mine.

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A method of soda-ash recovery from the pregnant solution in the chemical processing of low grade tungsten ore is herein proposed. The recovery process is based on the fact that the solubility of sodium bicarbonate is so small and the carbonate is precipitated in the present pregnant solution when the soda ash in the solution is converted to sodium bicarbonate. The process equipment designed are also presented in this article. In the design, the maximum utilization of the present facility in Sang Dong Mines is intensively considered,;i.e. recycling and regetting of carbon dioxide gas, utilization of present building and storage tanks, etc.

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Batch flotation tests of Sang dong tungsten ore (scheelite flotation feed of the mill) was carried out with fish oil as a colletor of scheelite. The above results are compared with those of oleic acid and led to the conclusion that the required quantity of collector can be reduced to a half, and a quarter in price, that of oleic acid when fish oil is used. Fish oil can be used at lower pulp temperature (10℃=mill water) at which oleic acid is not effective.

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Since June of this year. The Korea Tungsten Mining Company has been constructing a metal processing complex at Yongdongpo, industrial province of the capital city of Korea. The principal facilities of this complex are Tungsten Processing plant, Tungsten Carbide plant and Bismuth refining plant. In addition to these plants, various processing facilities of Ferro Tungsten, Bismuth alloy, Bismuth Salts, Molybdenium. Tellurium and Selenium are considered as immediate expansion objective of the said complex. In Tungsten processing plant the company produced synthetic scheelite will be converted to the ammonium para-tungstate(A.P.T.) of which is obtainable from tungstic acid(H₂WO₄). This acid can be derived from Hydro-Chloric acid digestion of synthetic scheelite. Some portion of this A.P.T. will be turned into Tungsten Metal powder by hydrogen reduction method. In Tungsten Carbide plant, Tungsten Carbide tipper tools would be initial product and latter it would broader to Rock percussion drill bits and wire drowing dies. The Bismuth refining plant will produce high purity Bismuth Metal(99.99% Bi) from crude Bismuth concentrate(30% Bi). There are of course, some obstacle ahead of these projects. The most significant one is the marketability of its forthcoming products. Their present domestic demand are very much limitted due to the weaker machinery industry of Korea. Thus increase the weight of foreign market, particularly Far East Asian countries, onto the Fruitful operation of this complex.

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Slack coal has generally less value of utilization compared to lump coal. Although Korean anthracite is produced mostly in powder form, still about 30% could be recovered as small sizes, which are presently misused as power coal but could be far more profitably utilized as stoker fuel. The demand for synthesis gas material at the fertilizer plants is also growing thus necessitating the utilization of Korean anthracite small sizes. A test has been made to observe how Korean anthracite small sizes would burn in a small hand fired furnace in order to obtain combustion data for further trial in retort type stoker. General combustion characteristics are excellent, indicating favorable prospect as industrial fuel such as on chain grate stokers, retort stokers, and gas producers.

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Korea has considerable deposits of zinc bearing complex sulfide ore, especially marmatite among others, but no processing plant, either pyrometallurgical or hydrometaillurgical, has been constructed yet. For the processing of the ore, which would contribute a great deal for the Korea metallurgical industry, the basic data on the technological chracteristics of the ore should be established. In order to obtain the basic data for the hydrometallurgical treatment of the ore and the subsequent electrolytic recovery of pure zinc, investigations are under way in expectation of the prospective application for the commercial production. In this article, a brief description of the processes of leaching, purification and electrolysis for zinc production is presented along with a few experimental results.

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