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저급 벤토나이트를 이용하여 합성한 4A형 제올라이트의 응용
노재성,홍성수 忠南大學校 産業技術硏究所 1988 산업기술연구논문집 Vol.3 No.2
Amorphous silica produced from low grade bentonite B₁by acid treatment was used for zeolite synthesis. The zeolite 4A was used for detergent-use. The results are summerized as follows. (1) When the condition of water hardness was 40℉h, water temperature was 30℃ and the stirring rate of water was 200rpm. the cation(Ca) exchange capacity of synthetic zeolite was observed as 307㎎ CaCO₃/ g zeolite for fifteen minutes. The amount of Ca ion exchanged by zeolite was more than 95 percent within three minutes. (2) The brightness of the synthetic zeolite was between 91 and 93. The median particle size of the synthetic zeolite was 3.0㎛. (3) In differential thermal analysis, the dehydration of the synthetic zeolite was detected between 35℃ and 500℃, lattice transformation take place at about 800℃. In thermal gravimetric analysis, the weight loss of the snythetic zeolite was 20.94 percent by dehydration between 33℃ and 511℃.
TEOS와 Condensed Ethyl Silicate(CES)로부터 제조된 고순도 SiO₂분말의 특성
노재성,조헌영,최정봉 忠南大學校 産業技術硏究所 1994 산업기술연구논문집 Vol.9 No.2
SiO₂powders were manufactured from TEOS, CES(condensed ethyl silicates) and PHT(partially hydrated TEOS) by sol-gel method. Then the chemical and the physical properties of the SiO₂powders are measured by IR, GC, TGA-DTA, XRD, SEM and particle size analyser. The chemical properties in IR spectra and GC analysis of CES are similar to those of PHT. Also the physical properties of SiO₂powders made from PHT are very analogous with the one manufactured from CES. The results suggest that the PHT in manufacturing of mullite and cordierite ceramics can be replaced with the CES.
시멘트의 수화응결에 대한 Sodium Naphthalene Sulfonate Formaldehyde 축합물의 영향에 관한 연구
노재성,김종웅 충남대학교 공업교육연구소 1987 論文集 Vol.10 No.1
This paper has been studied on the effect of Sodium Naphthalene Sulfonate Formaldehyde condensate(SNSF) to Cement, C₃A, C₃S and C₄AF by Zeta potential. The major results are as follows; (1) The Zeta potential of cement and C₃S are increased according to SNSF concentration, at this time, the initial hydration rate of these are retarded. On the other hand, the zeta potential of C₃A and C₄AF are decreased and initial hydration rate are accelerated. (2) Adsorption quantity of SNSF on the surface of cement and C₃S particles are increased with hydration time. But in the case of C₃A, adsorption quantity is decreased. (3) The initial hydration rate of cement is accelerated according to increasing of Na₂SO₄quantity in SNSF. But the side of this the initial hydration rate of cement is retarded.
大田市 可燃性 産業廢棄物 最適 處理方案에 關한 基礎 調査硏究
廬載星,趙憲英,洪性秀,姜浩 忠南大學校 環境問題硏究所 1992 環境硏究 Vol.10 No.-
A feasibility study for the treatment of flammable industrial solid wstes generated in Taejon was investigated. The results are summarized as follows. 1. The yearly generation rate of the industrial solid wastes from 124 companies was estimated to be 140,000 tons. 2. The flammable wastes occupied 66.2% of the total industrial solid wastes. They consisted predominently of synthetic resins and the sludges from paper and lather industries (88.3% out of the flammable industrial solid wastes). 3. Two rotary kiln incinerators to deal with 100 tons per day each were recommended. And an economic analysis for the operation of the incinerators was found to be promising.
저급 Bentonite를 이용한 A형 제올라이트의 합성
노재성,홍성수 忠南大學校 産業技術硏究所 1988 산업기술연구논문집 Vol.3 No.1
The A-type zeolite was synthesized from amorphous silica which was produced by acid(40%-H₂SO₄) treatment of bentonite which is low grade domestic clay minerals. At this time, the acid treatment condition was at 90℃for 30hrs. When the mole ratio of reactants were SiO₂/Al₂O₃=2,Na₂O/SiO₂=1, H₂O/Na₂O=30, the best rection time was 3hrs at 90℃ after aging at 60℃ for 1hr. But when the mole ratio of reactants were SiO₂/Al₂O₃=2,Na₂O/SiO₂=1, H₂O/Na₂O=24, it is difficult to controll the reaction time because the crystal conversion of A-type zeolite into hydroxysodalite was very fast. The spent acid was filtrated by compression, dehydrated at 110℃, and then Al₂O₃ was recovered by calcination at 700℃. NaAlO₂was prepared by solubilisation of recovered Al₂O₃in NaOH solution, and then Fe₂O₃ was removed by filltration. The A-type zeolite was synthesized at 90℃ for 4hrs without aging step from recovered Al₂O₃by reaction of NaAlO₂and Na₂SiO₃, at here the mole ratio of reactants were SiO₂/Al₂O₃=2,Na₂O/SiO₂=1, H₂O/Na₂O=30.
선박의장 배치 설계의 검도를 위한 컴퓨터 지원 시스템의 개발 사례
노재정,조형석,전진영,성낙운 경성대학교 공학기술연구소 1999 공학기술연구지 Vol.6 No.-
The purpose of this study is to develop a computer support system for the inspection of the outfitting arrangement of a ship design, which will increase the accuracy and the effectiveness of the inspection process. This system is integrated with a ORACLE database for transferring and storing 3D CAD data into the inspection system, and a dVISE virtual reality system for displaying the attributes of entities and the inspection results.