• 제목/요약/키워드: cement production

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The Cement Industry in Ethiopia

  • Mulatu, Dure;Habte, Lulit;Ahn, Ji Whan
    • 에너지공학
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    • 제27권3호
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    • pp.68-73
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    • 2018
  • The cement industry is one of the rapidly growing industry in Ethiopia. The average per capita cement consumption of the country has increased from 39kg to 62kg. However, this is still way below than the global average per capita consumption of 500kg. The Ethiopian government is planning to expand its cement industry by upgrading the current cement plants and also opening of new cement plants in order to meet the future demand of the country. Currently, the number of cement plants in Ethiopia has reached to 20. By the year 2025, per capita cement consumption is expected to increase to 179kg. Recently, Ethiopia has become one of Africa's largest market for the cement industry. In addition, Ethiopia has become the major exporter of cement in the Sub-Saharan African region. The Ethiopian cement industry is highly dependent on the use of imported energy sources for its production. This situation has a significant amount of impact on the high production costs of the industry. This paper will try to review the history, production, available resources, the technologies and energy use of the Ethiopian cement industry.

Global Trend of Cement Production and Utilization of Circular Resources

  • Lim, Chaeyeon;Jung, Euntae;Lee, Seongho;Jang, Changsun;Oh, Chaewoon;Shin, Kyung Nam
    • 에너지공학
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    • 제29권3호
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    • pp.57-63
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    • 2020
  • In this paper, we reported that the global trend of cement production and utilization as raw materials and as a fuel. As we know, cement is one of the significant materials required for the construction industry. The recent trend of rising urbanization, both the cement and construction industry played a vital role. The cement industry is a major sustainable infrastructure for the countries. Currently, China producing cement half of the world's cement production. During the year 2018, Korea producing cements nearly 57.5 million metric tons. Waste materials are used as circular resources and also having tremendous benefits for cement production. Another important use of these circular resources is fuel for the cement industry. There is a large potential benefit of the cement industry, but it's creating a severe environmental threat. The cement industry contributes to the major emissions of CO2. This leads the global warming. As per the Paris agreement, the Korean government initiated the recycling policy of waste materials and also the utilization of circular resources for the prevention of limited natural resources and also the global warming effect.

세라믹 바인더 제조공정의 알루미노실리케이트계 원료 적용 시스템 및 세라믹 바인더 물성개발 (Development of Production System and Properties of Ceramic Binder using Aluminosilicate Raw Material)

  • 박철;조성형;김경수;임채용
    • 시멘트 심포지엄
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    • 통권49호
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    • pp.25-26
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    • 2022
  • 화력발전소에서 발생하는 석탄회의 경우 콘크리트용 혼합재 용도 이외 잔재물은 대부분 폐기/매립되고 있는 실정이다. 매립되고 있는 석탄회도 시멘트용 원료로 대체 사용이 가능하나, 해수접촉에 의한 염소함량 및 수분 제어가 필수적이다. 따라서 본 연구에서는 매립 석탄회의 시멘트 원료 활용을 위한 제반 공정 기술개발을 추진 중에 있다.

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위성사진으로 본 북한의 시멘트 산업 (North Korea Cement Industry in Satellite Imagery)

  • 백철승;서준형;조진상;안지환;조계홍
    • 세라미스트
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    • 제22권2호
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    • pp.198-214
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    • 2019
  • The possibility of economic exchange with North Korea is increasing, but there is still a shortage of information of cement industry, which occupies the largest proportion of North Korean construction material industry. Therefore, this study researched the status of cement production facility management using satellite photographs of 16 cement factories in North Korea, and examined the operating status of North Korean cement industry by observing smoke discharged from the chimneys of the cement production facilities. When the satellite photographs were analyzed, it was observed that the monthly stack fog ratio of the North Korean cement factories was 55% in 2016, 60% in 2017 and nearly 65% in 2018. This demonstrates that the average operating ratio has been increasing continuously. However, the operation rate of the five major cement factories reaches the limit, actual cement production is estimated to have maintained the previous level or small increased.

혼합 cement의 개발 연구 (Development of blended cement in Korea)

  • 한기성
    • 시멘트 심포지엄
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    • 1호
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    • pp.31-40
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    • 1973
  • Cement industry in Korea, has made a remarkable progress in recent years and now annual production capacity is about 9,000,000 tons. However, this large amount of cement is only one kind of general portland cement type I, and it is urgent problem for ceme

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Emission characteristic of ammonia in cement mortars using different sand from area of production

  • Jang, Hongseok;So, Hyoungseok;So, Seungyoung
    • Environmental Engineering Research
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    • 제21권3호
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    • pp.241-246
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    • 2016
  • This paper discusses the influence of organic matter contained in aggregate on the emission characteristic of ammonia ($NH_3$) from cement mortar. $NH_3$ can be released to indoor-outdoor environment through diffusion in mortar (or concrete) and have resulted in the increasing air pollution, and especially well known as a harmful gas for the human body. The concentration of $NH_3$ released from cement concrete was then compared to the contents of organic matter contained in the aggregate. The result indicates that the contents of organic matter in the aggregate significantly differ with types of aggregate from different areas of production. The organic matter becomes organic nitrogen through the process of microbial breakdown for a certain period and pure ammonium ion ($NH_4{^+}$) is produced from the organic nitrogen. The $NH_4{^+}$ was reacted with alkaline elements in the cement and released as $NH_3$ from cement concrete through a volatile process. The released $NH_3$ was proportional to the contents of $NH_4{^+}$ adsorbed in the aggregate from different areas of production and the concentrations of $NH_3$ emission from cement mortar according to the aggregate differ by more than 4 times.

Cancer Mortality and Incidence in Cement Industry Workers in Korea

  • Koh, Dong-Hee;Kim, Tae-Woo;Jang, Seung-Hee;Ryu, Hyang-Woo
    • Safety and Health at Work
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    • 제2권3호
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    • pp.243-249
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    • 2011
  • Objectives: Cement contains hexavalent chromium, which is a human carcinogen. However, its effect on cancer seems inconclusive in epidemiologic studies. The aim of this retrospective cohort study was to elucidate the association between dust exposure in the cement industry and cancer occurrence. Methods: The cohorts consisted of male workers in 6 Portland cement factories in Korea. Study subjects were classified into five groups by job: quarry, production, maintenance, laboratory, and office work. Cancer mortality and incidence in workers were observed from 1992 to 2007 and 1997-2005, respectively. Standardized mortality ratios and standardized incidence ratios were calculated according to the five job classifications. Results: There was an increased standardized incidence ratio for stomach cancer of 1.56 (27/17.36, 95% confidence interval: 1.02-2.26) in production workers. The standardized mortality ratio for lung cancer increased in production workers. However, was not statistically significant. Conclusion: Our result suggests a potential association between cement exposure and stomach cancer. Hexavalent chromium contained in cement might be a causative carcinogen.

Modeling of temperature history in the hardening of ultra-high-performance concrete

  • Wang, Xiao-Yong
    • 한국건축시공학회지
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    • 제14권3호
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    • pp.273-284
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    • 2014
  • Ultra-high-performance concrete (UHPC) consists of cement, silica fume (SF), sand, fibers, water and superplasticizer. Typical water/binder ratios are 0.15 to 0.20 with 20 to 30% silica fume. In the production of ultra-high performance concrete, a significant temperature rise at an early age can be observed because of the higher cement content per unit mass of concrete. In this paper, by considering the production of calcium hydroxide in cement hydration and its consumption in the pozzolanic reaction, a numerical model is proposed to simulate the hydration of ultra-high performance concrete. The heat evolution rate of UHPC is determined from the contributions of cement hydration and the pozzolanic reaction. Furthermore, by combining a blended-cement hydration model with the finite-element method, the temperature history in the hardening of UHPC is evaluated using the degree of hydration of the cement and the silica fume. The predicted temperature-history curves were compared with experimental data, and a good correlation was found.

Production of Extracellular Polysaccharide, EPS WN9, from Paenibacillus sp. WN9 KCTC 8951P and Its Usefulness as a Cement Mortar Admixture

  • Kahng, Goong-Gjung;Lim, Seo-Hyung;Yun, Han-Dae;Seo, Weon-Taek
    • Biotechnology and Bioprocess Engineering:BBE
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    • 제6권2호
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    • pp.112-116
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    • 2001
  • The production of extracellular polysaccharide, EPS WN9, from Paenibacillus sp. and its suitability as a viscosity modifying admixture for cement mortar mixing were investigated. After 48h culture in an optimized medium, cell growth and EPS production were 1.2g/L and 4.0g/L, respectively. By adding EPS WN9 to mortar, it was possible to prepare a homogeneous mortar without material segregation and excess air entrapment. The optimal amount of EPS addition to mortar found to be 0.02 to 0.05%(w/w) of the cement used. Increasing the dosage of EPS WN9 from 0 to 0.05%(w/w) resulted in a setting retardation of 0.14h to 0.8h and an increase in the compressive strength of mortar of 10 to 20%.

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