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Characterization of kiln feed limestone by dynamic heating rate thermogravimetry
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics. (Thermochemical Energy Conversion Laboratory)
2016 (English)In: International Journal of Mineral Processing, ISSN 0301-7516, E-ISSN 1879-3525, Vol. 147, 31-42 p.Article in journal (Refereed) Published
Abstract [en]

Quicklime is a product rich in calcium oxide produced in industrial kilns. The process involves thermal decomposition of minerals with high content of calcium carbonate. The kiln feed properties vary with the geological formation from where the mineral is quarried or mined. Characterization of feed properties is necessary to achieve an optimized kiln production. In this work the decomposition of four different types of calcite ore was investigated by comparing conventional constant heating rate and dynamic heating rate thermogravimetric methods. The conclusion of this work is that the conventional method always "overshoots" the calcination temperature when continuously heating during calcination compared to the dynamic rate method that resembles the kiln by holding temperatures constant during the calcination event. This justifies the used of the dynamic rate method. By a correct experimental parameter setup the dynamic rate method can be adapted for individual kilns and feed fractions, giving new additional value to the kiln operator and increasing the high value use of limestone deposits. This new method to characterize calcination properties of kiln feed materials can be utilized in normal kiln operations and when developing new mixes of different quality limestone. The results show differences when comparing the methods and different materials even though CaCO3 is present only as calcite. In addition, the dynamic rate method is faster than the conventional method. Besides quicklime production the method can also be applied in other industries calcining limestone, such as cement clinker production.

Place, publisher, year, edition, pages
2016. Vol. 147, 31-42 p.
Keyword [en]
Limestone, lime kiln feed, dynamic rate thermogravimetry, thermal decomposition
National Category
Chemical Process Engineering
Research subject
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:umu:diva-112834DOI: 10.1016/j.minpro.2016.01.001ISI: 000370107800005OAI: oai:DiVA.org:umu-112834DiVA: diva2:882901
Note

Originally included in thesis in manuscript form.

Available from: 2015-12-16 Created: 2015-12-16 Last updated: 2016-04-08Bibliographically approved
In thesis
1. Sustainability measures in quicklime and cement clinker production
Open this publication in new window or tab >>Sustainability measures in quicklime and cement clinker production
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis investigates sustainability measures for quicklime and cement clinker production. It is the aim of this thesis to contribute to the effort of creating a more sustainable modus of industrial production.

The methods used comprises process simulations through multicomponent chemical equilibrium calculations, fuel characterization and raw materials characterization through dynamic rate thermogravimetry.

The investigated measures relate to alternative fuels, co-combustion, oxygen enrichment, oxyfuel combustion, mineral carbonation and optimizing raw material mixes based on thermal decomposition characteristics.

The predictive multicomponent chemical equilibrium simulation tool developed has been used to investigate new process designs and combustion concepts. The results show that fuel selection and oxygen enrichment influence energy efficiency, and that oxyfuel combustion and mineral carbonation could allow for considerable emission reductions at low energy penalty, as compared to conventional post-combustion carbon dioxide capture technologies. Dynamic rate thermogravimetry, applied to kiln feed limestone, allows for improved feed analysis with a deeper understanding of how mixing of different feed materials will affect the production processes. The predictive simulation tool has proven to be of practical value when planning and executing production and full scale campaigns, reducing costs related to trial and error.

The main conclusion of this work is that several measures are available to increase the sustainability of the industry.

Place, publisher, year, edition, pages
Umeå: Umeå universitet, 2015. 82 p.
Keyword
limestone, quicklime, cement clinker, sustainability, oxygen, carbon dioxide, thermal decomposition, dynamic rate thermogravimetry, predictive multicomponent chemical equilibrium calculations, mineral carbonation
National Category
Chemical Process Engineering
Identifiers
urn:nbn:se:umu:diva-112842 (URN)978-91-7601-392-2 (ISBN)
Public defence
2016-01-29, sal N420, Naturvetarhuset, Umeå universitet, Umeå, 13:15 (English)
Opponent
Supervisors
Available from: 2015-12-18 Created: 2015-12-16 Last updated: 2015-12-18Bibliographically approved

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Eriksson, Matias
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