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石灰石에 含有된 挾土(粘土, 頁岩)가 Mill 분쇄에 미치는 影響
金昺圭,朴壽幸 成均館大學校 科學技術硏究所 1984 論文集 Vol.35 No.2
Since the major expence of production in cement industry is the electric power cost, many have been studying various ways for saving the electric power. In order to save the electric power cost the crushing effect of limestone was studied. Clay and shale were added to limestone and their crushing effect was investigated as well. The results are as follows: 1) The crushing effect of limestone when clay and shale were added increased by 9.5-13% as compared with that of lime-stone alone. 2) -The required electric power was saved by 3.4-12.2% when clay and shale were added to limestone. 3) The crushing effect of clay was better than that of shale as the beginning of crushing, but it decreased against crushing time and the quantity added.
김병규 한국화학공학회 1967 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.5 No.2
Generally, SiO₂ were disliked in natural water suspension solutions and various methods of its exclusion have been investigated in industrial fields. In colloid science, SiO₂ of the nascent state in water solution is well known as a hydrophilic inorganic sol, and also has negative charge in weak acid, neutral solution and alkali solution. Clay and arsenic trisulfide particles in water solution have the properties of negative charge and hydrophobic sol. In the above cases, the suspension expects to appear phenomena of the sensitization with mutual action according to control the concentration of hydrophilic sol on hydrophobic sol in the disperse system. In this experiment, it was investigated that the effect of coagulation by this sensitization of As₂S₃ and clay with SiO₂ were calculated by using C_0^(60) radioactive isotope method, and moreover, in its coagulation state observed by electromicroscope. The coagulation effects of the sensitization of SiO₂ sol against clay suspension were much weaker than the electrolytes in industrial water or natural water comparing the action of coagulation of electrolyte (Al₂(SO₄)₃) with non-electrolyte (SiO₂), and the effect of coagulation by SiO₂ concluded in this research to be caused by only van der Waals' forces and not Coulomb's forces.
金昺圭,梁斗錫 成均館大學校 科學技術硏究所 1987 論文集 Vol.38 No.2
Multicomponent adsorption equilibria of organics on activated carbon were predicted by the ideal adsorbed solution (IAS) theory and the results were compared with those calculated from a different Freundlich-type isotherm. Mutual interactions between adsorbable species based on the competitive adsorption on heterogeneous surface of activated carbon. To ascertain the surface heterogeniety, the distribution of adsorption potential was calculated from the exponent parameter of single component Freundlich isotherms by assuming an exponential distribution function. The affinity for activated carbon was in the order : p-chlorophenol>m-cresol>phenol>aniline. The average percent deviation of the IAS theory is 5∼11% while that of Sheindorf's isotherm is 8∼20%. Although some deviations between measured and calculated results are observed, the IAS theory permits rapid and relatively accurate predictions of adsorption equilibria for two components. The results show that IAS theory is suitable for the extended application to multicomponent adsorption systems.