통합 검색 | Korea Science

조남돈;김종훈
- 한국주조공학회지
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- 제9권3호
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- pp.247-256
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- 1989
The gasification reaction rates by $CO_2$ in $CO/CO_2/N_2$ of various compositions in the temperature range of $900-1200^{\circ}C$ were measured for foundry coke and anthracite lump. The data for the rates was analyzed with Langmuir-Hinshelwood rate equations for the gasification of carbonaceous specimens. The values of the apparent activation energies of the reactions obtained from these data were ranged to be 47-99 and 73-128Kcal/mol respectively for foundry coke and for anthracite lump. The major contribution to decrease in tensile strength was shown to be attributable to the enlarging of the macropores in the coke and that of crack in the anthracite lump. Under the same experiment of the gasification of foundry coke, the rate of form coke was increasing as the addition of $Fe_2O_3$ increases.
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이상도;권영일
- 산업경영시스템학회지
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- 제4권5호
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- pp.1-10
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- 1981
The purpose of this study is to cut down cost of production and improve the productivity of industry through quality improvement of castings and reduction of defectives by applying the experimental design to the foundry sand mixing operation done at molding department in the foundry. Among the related foundry sand mixing factors which have an effect on casting the experiment of which factors have a dominant effect on quality improvement was performed between two different levels by means of "$2^n$ type orthogonal array." The results cail be summarized as follows ; (1) The optimum conditions per each foundry sand mixing between two different levels proved to be such as $A_2$(used sand) : 24 unit (172.8kg), $B_2$(unused sand ) : 2 unit (15.0kg), $C_2$(binder) : 2.5 unit (4.4kg). $D_2$(addition agent) : 1 unit(1.4kg) and $F_1$(moisture) : 7.4%(14.6kg). (2) As a result of the application of experimental design, the fraction defective during the foundry sand mixing operation turned out to be reduced front 6.6% to 2.04%. (3) For the purpose of cost-down, It was found that the optimum level decision of foundry sand mixing for various castings is required to be made by means of experimental design.al design.
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김진만;조성현;곽은구
- 청정기술
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- 제8권3호
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- pp.129-139
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- 2002
This is the study for recycling waste foundry sand. Authors studied about main subject of grading of aggregate and three experimental items such as physical properties of waste foundry sand, optimum grading for concrete products of low water ratio, and quality variations of concrete products according to substitution proportion of fine aggregate as waste foundry sand. We were convinced of following results by experimental study. The first was that waste foundry sand was not fit as the aggregate for concrete because of bad qualities such as grading, unit weight, solid volume and passing 0.08 mm seive, so it is proper to composition using with other fine aggregetes. The second was that optimum grading is fineness modulus of 2.77 to 3.28 And the last is that optimum condition about substitution proportion as waste foundry sand is 10% fine aggregate.
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이태윤;;박재우
- 한국지반공학회논문집
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- 제18권5호
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- pp.143-157
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- 2002
주물사의 일반적인 지하수 오염물질인 TCE에 대한 반응성을 조사하기 위해 batch와 column실험을 하였다. 본 실험에서 얻어진 주물사의 반응성은 실제 반응벽체에 쓰여지는 철에 비해 높거나 비슷한 결과를 나타내었다. 또한, 주물사에 포함된 클레이와 TOC에 의해 TCE의 이동이 급격히 감소하는 것을 관찰하였다. 따라서, 실제 현장 상황에서는 토양미생물에 의한 분해에 의해 계산된 값보다 훨씬 낮은 농도의 TCE가 검출되리라 예상된다. 실제 현장 반응벽체 설계에 있어서 1 m두께의 벽체가 설치되기 위해서는 주물사에 포함된 철의 함량이 1%이상이면 안전측으로 벽체설계가 가능하다고 볼 수 있다.
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박제선;김태경
- 산업기술연구
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- 제16권
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- pp.25-30
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- 1996
The waste foundry sand might be recycled in concrete, resulting in energy saving and environmental protection. An half Factorial Experiments were performed with the variables of W/C ratio, S/A, Sand/Waste foundry sand ratio and Slump as a preliminary study for optimum mix design of concrete. The results show that then W/C ratio is the most important factor to the concrete strength. The substitute of waste foundry sand up to 30% has little influence, saying that it can substitute the fine aggregate without damaging the concrete properties.
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