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Dolomite 로 부터 고토인안비료 제조의 기초적 연구
김창은 한국화학공학회 1972 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.10 No.1
This investigation was carried out to produce a high quality magnesium compounded fertilizer by initially dissolving calcined dolomite in sea water to form the intermediate Mg(OH)₂ precipitate, and reacting this intermediate with phosphoric acid and ammonia thereafter. The experimental results were obtained as follows; 1) The optimum calcination temperature of dolomite was about 950℃ for 30 minutes operation and in the displacement of the calcined dolomite in sea water, the optimum mole ratio of calcium hydroxide to magnesium chloride is 1:1.2 for 4 hours of the dissolution time. 2) The high yield of the magnesium compounded fertilizer was obtained, when the precipitate was reacted with 20% phosphoric acid and neutralized with 28% ammonium hydroxide thereby obtaining the alkalinity of the solution to pH 9. 3) By the results of X-ray diffraction and chemical analysis, the major component of the product was magnesium ammonium phosphate at the above condition and the fertilizing effect was also good.
EVAc emulsion에 의한 Cement 미세구조의 변화
김창은 한국시멘트협회 1989 시멘트 심포지움 Vol.17 No.-
시멘트 모르타르에 EVAc 에멀젼 및 계면활성제(Sodium Dodecylbenzenesulfonate)를 첨가하여 압축강도, 흡수율, 화학적 저항성, 수화발열속도, 전자현미경 등으로 그 물성을 관찰하였다. EVAc를 시멘트에 첨가할 경우 5-15wt$\%$, SDBF는 0.03wt$\%$를 첨가하고 혼수량을 flow value로써 기준하는 것이 최적조검임을 알 수 있었다. 그리고 EVAc emulsion을 첨가함으로써 혼수량 및 흡수율의 감소 효과를 거둘 수가 있었으며 또한 화학적 저항성도 증가되었다. EVAc emulsion을 과다 첨가할 경우에는 기포가 많이 형성되어 강도가 저하하나, 여기에 계면활성제(Sodium Dodecylbenzenesulfonate)를 가하면 강도가 증가하였으며, 한편 수화 속도는 지연되었다.
Intercalation 반응에 의한 Organo-montmorillonite의 합성 및 반응속도 연구
김창은,최진호,형경우 한국세라믹학회 1984 한국세라믹학회지 Vol.21 No.1
A stable intercalation complex was formed by adsorption of alcanol (ROH, R; $C_{10}H_2$, $C_{12}H_{25}$, $C_{14}H_{29}$) on the surfaces of Yongil bentonite in which the interlayer cation had been exchanged by n-decylammonium ion $(C_{10}H_{21}NH_3^+)$ The layer charge density calculated from the increaments of basal spacings was 0.34 per unit chemical formula. Thermochemical properties of synthesized $C_{10}H_{21}NH_3^+$ montmorillonite were studied by means of DSC, TGA, DTG, Thermal analysis showed two steps of desoption behavior of $C_{10}H_{21}NH_3^+$ ion namely nonyl $(CH_3(CH_2)_8$ decomposition reaction of 40$0^{\circ}C$ and methyleneammonium decomposition reaction of 78$0^{\circ}C$ The activation energy of nonyl decomposition reaction of $C_{10}H_{21}NH_3^+$ -montmorillonite respectively.