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Industrial application of blast furnace slag as a substitute for sand at the cement plant of Hadjar-Soud (Algeria)

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Category: Solid-state physics, mineral processing

Last Updated on 11 March 2018

Published on 11 March 2018

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Authors:

Z. Mekti, Badji Mokhtar University, Annaba, Algeria, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

M. Bounouala, Doctor of Technical Sciences, Badji Mokhtar University, Annaba, Algeria

M. Chettibi, Doctor of Technical Sciences, Badji Mokhtar University, Annaba, Algeria

A. Boutemedjet, Badji Mokhtar University, Annaba, Algeria

Abstract:

Purpose. This study is conducted on the use of industrial waste (blast furnace slag) from the El-Hadjar steel plant located in eastern Algeria. The research aims to understand the behaviour of the addition of Slag as raw material (replacing sand) in the preparation of the mixture before baking in the rotary kiln at the Hadjar-Soud cement plant in Skikda.

Methodology. The representative samples taken from the cement plant site are subjected to grinding of the mixture of limestone, slag, clay and iron ore, the material prepared at a grain size of less than 50 µ is subjected to a physicochemical characterization. The prepared sample is placed in a furnace with a temperature of up to 1450 °C.

Findings. The results obtained during the tests show that the addition of slag into the raw meal does not affect the chemical or mineralogical composition of the clinker. However, the clinker obtained reveals significant results and meets the Algerian standard NA 442 2000 (CPJ CEM II/A 42.5). The addition of slag to replace the sand has allowed us to reduce the annual CO₂ emission rate by about 17.5 %, and contributes to the reduction of pollution.

Originality. The originality of this work is the preparation of the raw cement meal, based on slag (already decarbonated material) instead of sand. As a rule, for the production of cement clinker, the proportion of the raw materials is: limestone (77‒80 %), clay (16‒18 %), iron ore (1.5‒3 %) and sand (2‒4 %). In the present work, the proportions for the production test of the slag-based clinker are respectively: limestone 70 %, slag 9 %, clay 19.2 % and iron ore 1.8 %. The estimate of the annual CO₂ emission rate in the cement plant was carried out by the Software (GEMIS 4.7).

Practical value. The process for obtaining slag-based clinker (steel waste) is probably of great importance for the production of cement for several reasons: the production of one tonne of Clinker at a minimum cost, along with management of non-renewable natural raw materials, such as sand and limestone deposits, and work towards sustainable development.

References.

1. Peacey, J. G., and Davenport, W. G., 2016. The iron blast furnace: theory and practice. Elsevier.

2. Jiang, X., Su, S. and Song, J., 2016. Metal Pollution and Metal Sustainability in China. Metal Sustainability: Global Challenges, Consequences, and Prospects.

3. Annual Mean Global Carbon Dioxide Growth Rates. Dlugokencky and Tans. Published in December 2012.Retrieved on 18 November 2013.

4. Piatak, N. M., Parsons, M. B. and Seal, R. R., 2015. Characteristics and environmental aspects of slag: A review. Applied Geochemistry, 57, рр. 236‒266.

5. Öko-Institut, 2014. GEMIS 4.9, 2014, Life cycle assessment software package, Global EmissionModel for integrated systems, Version 4.9. [computer program] Öko-Institut.

6. Cetim Juillet, 2015. Bilan thermique de l’atelier de cuisson de ligne N°2 (SCHS).

7. Staněk, T. and Sulovský, P., 2015. Active low-energy belite cement. Cement and Concrete Research, 68, pp. 203–210.

8. Tobón, J. I., Payá, J. J., Borrachero, M. V. and Restrepo, O. J., 2012. Mineralogical evolution of Portland cement blended with silica nanoparticles and its effect on mechanical strength. Construction and Building Materials, 36, pp. 736–742.

9. Namoulniara, D. K., 2015. Etude expérimentale de la diffusion du CO₂ et des cinétiques de carbonatation de matériaux cimentaires à faible dosage en clinker. PhD. Université de La Rochelle.

10. Idrissi, M., 2012. Etude de l'inclusion du fer dans les ciments sulfao-alumineux et valorisation du caoutchouc dans leurs mortiers.

11. Pr.NA 442 (2013): ciment “composition, spécifications et critères de conformité des ciments courants”.

12. Ussiri, D. and Lal, R., 2012. Soil emission of nitrous oxide and its mitigation. Springer Science & Business Media.

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