Evaluation on recycled clinker production and properties from regeneration of completely recycle concrete

2021 ◽  
Vol 301 ◽  
pp. 123882
Author(s):  
Yunpeng Liu ◽  
Chao Yang ◽  
Fazhou Wang ◽  
Shuguang Hu ◽  
Ming Zhu ◽  
...  
Keyword(s):  
Recycle Concrete ◽  
Clinker Production

scholarly journals Conventional and Alternative Sources of Thermal Energy in the Production of Cement—An Impact on CO2 Emission

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1539
Author(s):  
Karolina Wojtacha-Rychter ◽  
Piotr Kucharski ◽  
Adam Smolinski
Keyword(s):  
Co2 Emissions ◽  
Co2 Emission ◽  
Alternative Fuels ◽  
Carbon Dioxide Emission ◽  
Calorific Value ◽  
Production Costs ◽  
Partial Substitution ◽  
Research Activities ◽  
Starting Point ◽  
Clinker Production

The article evaluates the reduction of carbon dioxide emission due to the partial substitution of coal with alternative fuels in clinker manufacture. For this purpose, the calculations were performed for seventy waste-derived samples of alternative fuels with variable calorific value and variable share in the fuel mixture. Based on annual clinker production data of the Polish Cement Association and the laboratory analysis of fuels, it was estimated that the direct net CO2 emissions from fossil fuel combustion alone were 543 Mg of CO2 per hour. By contrast with the full substitution of coal with alternative fuels (including 30% of biomass), the emission ranged from 302 up to 438 Mg of CO2 per hour, depending on fuel properties. A reduction of 70% in the share of fossil fuels resulted in about a 23% decrease in net emissions. It was proved that the increased use of alternative fuels as an additive to the fuel mix is also of economic importance. It was determined that thanks to the combustion of 70% of alternative fuels of calorific value from 15 to 26 MJ/kg, the hourly financial profit gain due to avoided CO2 emission and saved 136 megatons of coal totaled an average of 9718 euros. The results confirmed that the co-incineration of waste in cement kilns can be an effective, long-term way to mitigate carbon emissions and to lower clinker production costs. This paper may constitute a starting point for future research activities and specific case studies in terms of reducing CO2 emissions.

scholarly journals Substance Flow Analysis of Zinc in Two Preheater–Precalciner Cement Plants and the Associated Atmospheric Emissions

Atmosphere ◽  
2022 ◽  
Vol 13 (1) ◽  
pp. 128
Author(s):  
Zhonggen Li ◽  
Yiming Huang ◽  
Xinyu Li ◽  
Guan Wang ◽  
Qingfeng Wang ◽  
...  
Keyword(s):  
High Temperature ◽  
Production Process ◽  
Flow Analysis ◽  
Distribution Patterns ◽  
Cement Industry ◽  
Environmental Stability ◽  
Anthropogenic Sources ◽  
Human Beings ◽  
Atmospheric Emission ◽  
Clinker Production

Atmospheric emission of heavy metals from different anthropogenic sources is a great concern to human beings due to their toxicities. In order to disclose the emission levels and the distribution patterns of zinc (Zn) in the modern cement industry with respect to its low boiling point (~900 °C) comparing to the high-temperature (1450 °C) clinker production process, solid samples representing the input and output flow of Zn during the entire production process in two preheater–precalciner cement plants (CPs) were collected and analyzed. For the first time, it was found that the behaviour of Zn inside different precalciner CPs was similar despite a huge difference in the Zn inputs to the CPs; namely, almost all the Zn input was output in clinker, which was then mixed with different additives and retarder to make cement products. The high-temperature clinkerisation process would incorporate Zn into the aluminosilicate of clinker. As a result, there was no enrichment of Zn during clinker production and the atmospheric emission factor was relatively low at 0.002%, or 1.28–9.39 mg Zn·t−1 clinker. Our result for the atmospheric Zn emissions from CPs was much lower than most previous reports, implying the CPs were not a crucial Zn emission source. However, the higher load of Zn in some raw/alternative materials—like nonferrous smelting slag with a Zn content of ~2%—could greatly increase the content of Zn in clinker and cement products. Therefore, further investigation on the environmental stability of Zn in such Zn-laden cement and concrete should be carried out.

Comparative LCA of sewage sludge valorisation as both fuel and raw material substitute in clinker production

2013 ◽  
Vol 51 ◽  
pp. 205-213 ◽  
Author(s):  
Cesar Valderrama ◽  
Ricard Granados ◽  
Jose Luis Cortina ◽  
Carles M. Gasol ◽  
Manel Guillem ◽  
...  
Keyword(s):  
Sewage Sludge ◽  
Raw Material ◽  
Comparative Lca ◽  
Clinker Production

scholarly journals Effect of the Nano-Ca(OH)2 Addition on the Portland Clinker Cooking Efficiency

Materials ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 1787
Author(s):  
Azzurra Zucchini ◽  
Paola Comodi ◽  
Alessandro Di Michele ◽  
Riccardo Vivani ◽  
Lucia Mancini ◽  
...  
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Energy Saving ◽  
Size Distribution ◽  
New Technology ◽  
Low Energy ◽  
Free Lime ◽  
Work Index ◽  
Lime Concentration ◽  
Clinker Production

A new technology was tested to improve the cooking efficiency of the raw mixture for Portland clinker production by the use of nano-Ca(OH)2. A decrease in the free lime concentration after the firing of approximately 35% and 55% in the nano-added clinkers burned at 1350 °C and 1450 °C, respectively, with respect to the standard Portland clinkers was observed. Moreover, in the nano-added clinkers, a slight decrease in alite (C3S), of approximately 2–4 wt%, and increase in belite (C2S), of approximately 5–6 wt%, were observed. Despite these variations, the C2S and C3S abundance lies within the ranges for standard Portland clinkers. The results showed that the nano-addition leads to an increase of the raw mixtures’ cooking efficiency. The relatively low energy required for the clinker firing could be used to increase the plant productivity and decrease the CO2 emissions during clinker burning. The decrease of the work index of the clinkers produced by the use of the nano-Ca(OH)2 also contributes to the energy saving during clinker grinding. Differences were also found in the pore size distribution among nano-added clinkers and the standard Portland clinker. The smallest porosities with the modal volume lying in the class of 3 × 10−6 mm3 were found to increase by the use of nano-Ca(OH)2. However, the pore volumes higher than 2.0 × 10−5 mm3 decreased in the nano-added clinkers.

Sign in / Sign up

Export Citation Format

Share Document