• 자원리싸이클링
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• 제20권6호
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• pp.71-77
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• 2011

용융클링커 제조용 혼합원료 중의 하나로 고로슬래그를 사용하였다. 고로슬래그를 사용한 혼합원료는 용융클링커 제조를 위해 1620에서 용융하였다. 냉각된 클링커는 XRD 패턴으로 클링커 광물의 생성여부를, 색도분석기로 색도를 분석하였다. 용융클링커는 XRD 분석을 통해 OPC 광물과 동등의 클링커 광물을 포함하고 있다는 것을 확인할 수 있었다. 용융시멘트는 OPC보다 백색도가 높아, 색상이 OPC보다 옅게 관찰되었다. 용융시멘트의 LSF 및 SM이 높아짐에 따라 백색도는 낮아졌다. 또한 슬래그를 용융시켜 제조한 시멘트 클링커는 고로 슬래그시멘트보다 백색도가 높았다.

• 한국세라믹학회지
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• 제11권1호
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• pp.29-35
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• 1974

Effect of calcium sulfate and barium sulfate on the formation of portland cement clinker was studied by means of chemical analysis. DTA and X-ray diffraction analysis. In the presence of liquid phase, effect of the additives on the formation of tricalcium silicate was examined according to the reaction, 2CaO.$SiO_3$＋CaO$\longrightarrow$3CaO.$SiO_3$, which is the principal reaction in portland cement clinkerization, and optimum conditions in firing clinker concerning amount of additive, firing time and temperature were determined, and its kinetics was referred to. The experimental results are summerized as follow: (1) Appropriate burning temperature range of cement clinker is more limited as the content of calcium sulfate in clinker is increased. Amount of calcium sulfate, firing time and temperature in proper condition of clinkerization is related to each others. Being added suitable quantity of calcium sulfate, firing temperature of clinker can be lowered about $100^{\circ}C$. (2) When 3-5 mole% of calcium sulfate is added, firing time of 15-30 minutes at about $1380^{\circ}C$ is reasonable, and if the content is over7 mole %, firing for 1 hr. or more at $1350^{\circ}C$ is anticipated to be optimum condition. (3) In the reaction of tricalcium silicate formation, the role of barium sulfate as a mineralizer is similar to that of calcium sulfate, but the optimum firing temperature of cement clinker containing barium sulfate tends to be 20-$30^{\circ}C$ higher than that of clinker containing calcium sulfate. (4) When barium sulfate is used as mineralizer, 2-3 mole % of it to tricalcium silicate is recommended and if it is added more than this amount, free CaO is increased rapidly in clinker and alite formation is inhibited.

• 자원리싸이클링
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• 제29권6호
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• pp.48-56
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• 2020

본 연구에서는 염소 함유 클링커 특성을 분석하기 위해 raw mix 제조 시 CaCl2를 첨가하였으며, 이때 염소 함량을 고농도 조건인 2,000ppm까지 제어하였다. 염소 첨가 raw mix의 소성온도는 1250℃에서 1350℃까지 조정하였으며, 각각의 최대온도에서 10분간 유지하였다. 모듈러스는 LSF-92.0, SM-2.5 및 IM-1.6으로 고정하였으며, 염소 함유 클링커의 소성성은 free-CaO 분석을 통해 확인하였다. 염소 함량 증가에 따라 free-CaO는 감소하였으며, 1350℃-2000ppm의 free-CaO 함량은 1.5%까지 낮아졌다. 염소 함량 증가에 따른 광물특성 확인을 위해 광학현미경 및 XRD를 활용하였다. 1250℃ 소성 시에는 클링커 광물을 관찰할 수 없었으며, 1350℃ 소성 시에는 염소 함량 증가에 따라 alite 크기가 소폭 증가하였다. 또한 염소 함량 증가에 따라 우수한 광물결정성을 발현되어 클링커 내 염소함량이 증가할수록 우수한 소성성 및 광물특성을 보였다.

• 한국주조공학회지
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• 제5권2호
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• pp.97-108
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• 1985

In order to investigate the effect of magnesia clinker on the characteristics of the investments, temperature change during setting, setting time, compressive strength and thermal expansion of the investments were measured, and x-ray analyses were also performed. The investments were prepared in accordance with variation of the content and the particle size of magnesia clinker respectively. From this experiment, the results were summarized as follows; 1. Temperature of the investments during setting rapidly increased with increase of MgO contents and decrease of the particle size of magnesia clinker. 2. Setting time decreased with increase of MgO contents and decrease of the particle size of magnesia clinker. 3. Compressive strength increased with increase of MgO contents and decrease of the particle size of magnesia clinker. 4. Thermal expansion decreased with increase of MgO contents and decrease of the particle size of magnesia clinker. From the above results, the investment which contains 8% of MgO (270-325mesh) could be recommended for phosphate investment castings.

• 한국세라믹학회지
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• 제25권6호
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• pp.593-600
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• 1988

The properties of 10 kinds of MgO clinker were investigated to know the effect of MgO clinker's porperties on corrosion of MgO-C brick. For MgO clinker, chemical composition, porosity, density, periclase grain size, and microstructure were examined, while slag corrosion resistance was examined for MgO-C brick. In MgO clinker pore size and it's distribution, periclase grain size, impurities composition and the composition of grain boundaries are more important factors to determine corrosion degree of MgO-C brick than density, potosity and MgO purity.

• 자원리싸이클링
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• 제18권3호
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• pp.49-54
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• 2009

Alinite계 클링커 합성 시 MgO의 영향에 대해 검토하였다. Alinite 조성비 및 Alinite 조성비에 MgO를 3.77% 대체하여 $760^{\circ}C$ 및 $800^{\circ}C$에서 $1,400^{\circ}C$까지 $100^{\circ}C$ 간격으로 3시간 열처리하여 합성 상 및 수화열을 측정하였다. MgO를 첨가하지 않은 경우, $1,300^{\circ}C$에서 alinite, CCA와 함께 ${\beta}-C_2S$상과 f-CaO가 다량 존재하였으나, MgO를 첨가한 경우, $1,300^{\circ}C$이상에서 alinite 상만이 존재하였으며, $1,300^{\circ}C$에서 가장 높은 형성률을 보였다. 또한, MgO를 첨가한 경우, OPC에 비해 유도기를 거치지 않은 수화거동을 보였다.

• 열처리공학회지
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• 제36권1호
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• pp.22-32
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• 2023

In general, when scrap is dissolved in an electric arc furnace, the amount of electric furnace steel dust (EAFD) generated is about 1.5% of the scrap charge amount, and the electric furnace steel dust collected by the bag filter is charged into the Rotary Kiln or Rotary Hearth Furnace (RHF), and the zinc component is recovered as crude zinc oxide, at which time a clinker of Fe-Base is generated. In this research, first, for the efficient resource conversion of electric furnace steel dust, a reduction and roasting experiment was conducted and the reaction kinetics was examined. As a result of the experiment, it was observed that the reduction and roasting reaction was actively conducted in the range of 1100~1150℃, and melting occurred in the range of 1250℃. In the past, this clinker was widely used as a roadbed material for road construction and an Fe-Source for cement production, but in recent years, it has been mainly reclaimed due to strengthening environmental standards. However, landfill treatment is by no means a desirable treatment method due to environmental pollution caused by leachate, expensive landfill costs, and waste of Fe resources. Therefore, in order to more actively recycle the Fe component in the clinker, first of all the clinker was pulverized into an optimal particle size, and anthracite and binder (starch) were added to the magnetic material obtained by specific gravity and magnetic separation for briquet. As a experimental results, it was possible to efficiently separate clinker as Fe component and other slag component by specific gravity and magnetic force. As a results of loading and dissolving the manufactured briquet clinker in an electric arc furnace, it was observed that the unit of power and production yield were clearly improved and the carbon addition effect in molten metal was also somewhat.

• Computers and Concrete
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• 제15권1호
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• pp.89-101
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• 2015

In this paper, Artificial Neural Networks (ANN) and Multiple Linear Regression (MLR) models were discussed to determine the compressive strength of clinker mortars cured for 1, 2, 7 and 28 days. In the experimental stage, 1288 mortar samples were produced from 322 different clinker specimens and compressive strength tests were performed on these samples. Chemical properties of the clinker samples were also determined. In the modeling stage, these experimental results were used to construct the models. In the models tricalcium silicate ($C_3S$), dicalcium silicate ($C_2S$), tricalcium aluminate ($C_3A$), tetracalcium alumina ferrite ($C_4AF$), blaine values, specific gravity and age of samples were used as inputs and the compressive strength of clinker samples was used as output. The approximate reasoning ability of the models compared using some statistical parameters. As a result, ANN has shown satisfying relation with experimental results and suggests an alternative approach to evaluate compressive strength estimation of clinker mortars using related inputs. Furthermore MLR model showed a poor ability to predict.

• 시멘트
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• 통권28호
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• pp.51-57
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• 1969

• 시멘트 심포지엄
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• 26호
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• pp.53-63
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• 1999