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명반석의 Ammonia 추출처리잔사로부터 Alumina 의 제조
조철형,김이현,김숭평 ( Chull Hyung Cho,Yi Hyun Kim,Soog Pyung Kim ) 한국화학공학회 1975 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.13 No.3
Potash-ammonia fertilizer K₂SO₄ · (NH₄)₂SO₄ is prepared from the uncalcined alunite treated with ammonia water. The residue containing a large amount of alumina treated by alkali solution may be regarded as a resource of alumina of high purity. The residue treated with ammonia contains 45∼50% alumina, 25∼30% silicate, 10∼15% moisture and iron, After extracting the alumina which was reacted into the soluble sodium aluminate, carbon dioxide is blown to precipitate aluminium hydroxide. The slurry is them filtered, to produce alumina.
重化學工業機械의 國産化方案에 關한 硏究 : 特히 窯業에 있어서의 燒成爐, 粉碎機, 排風機, 冷却機, 電氣集마器 自動枰量供給器 等의 製作을 目的으로
趙哲衡,朴碩喆,丁太權,宋鐵,桭達福,金基玉,朴煥奎,趙煥從,朴善鐘,金種一,李茂錫 朝鮮大學校 1977 綜合論文集 Vol.1977 No.-
This is to investigate the posibility of home manufacturing of heavy chemical industry machines, such as rotary kiln, crusher, blower, cooler, electrostatic precipitator and weighing feeder of cement plant. It is concluded that even though we can not make all of them (some of them are made now and some others are going to be made in the near future, some of them are made whole and some others are made partially), we can build or export the cement plant by importing the important machines which we can not make now and by substituting them with ours gradually.
피마자 줄기를 利用한 pulp 製造 및 製紙에 關한 硏究
趙哲衡,金寬洙 朝鮮大學校 工科大學 1974 論文集 Vol.3 No.-
For the utilization of unwooden materials for manufacturing paper and pulp, the stem of castor-oil plant was examined and the results are as follows: (1) Per centage of cellulose in the stem of castor-oil plant was.38. (2) Physicalmeasures on the sample basic weight 60g/㎡were : bursting strength, 0.43Kg ; tensible strength, 1.69Kg ; and tear strength, 48. (3) Chemipulp made from castor-oil plant stem can be used in manufacturing papers of various qualities, from low to high, including tissue paper, wrapping paper, and cardboard. (4) The amount of pulp product out of average harvest of stems of castor-oil plant. from 10a was about 1.5 tons.
金崧平,趙哲衡,金二炫 朝鮮大學校 工科大學 1974 論文集 Vol.3 No.-
It was found that almost all amount of K₂SO₄in uncalcined alunite was extracted in the forms of K₂SO₄(NH₄)₂SO₄mixture in proper concentration (7∼8mol) of ammonia water. This process was attempted to extract the potash ammonia ferlitizer fron the uncalcined mt. ok mae alunite ore under appopriate raction temperature and react-on time. The indastrial manufactuing methods of the potsh-ammonia mixtnre fertilizer are as follows; (1) The appliable reaction temperatare by the experimental data, was 230∼240℃ (2) The optimum time applied to the reaction was 3 to 4 hoars.