Flash calcination of kaolinite rich clay and impact of process conditions on the quality of the calcines: A way to reduce CO2 footprint from cement industry

Abraham Teklay Gebremariam, Chungen Yin, Lasse Rosendahl

Research output: Contribution to journalJournal articleResearchpeer-review

11 Citations (Scopus)

Abstract

Use of properly calcined kaolinite rich clay (i.e., metakaolin) to offset part of CO2-intensive clinkers not only reduces CO2 footprint from cement industry but also improves the performance of concrete. However, calcination under inappropriately high temperatures or long retention times may deplete metakaolin into unwanted products (e.g., mullite), which limits the use of the calcines as a supplementary cementitious material. With this regard, a dynamic model of flash calcination of kaolinite rich clay particles is developed using gPROMS (general PROcess Modeling System) to predict the impacts of calcination temperature and residence time on the transformation of the clay particles and to derive a favorable production path that is able to achieve optimum amount of the desired product. Flash calcination tests of the kaolinite rich clay particles are also performed in a pilot-scale gas suspension calciner. The model is validated by the experimental data (e.g., the degree of dehydroxylation and the density of the calcines). Based on the model, the impacts of process conditions and feed properties on the quality of the calcination products are thoroughly examined.
Original languageEnglish
JournalApplied Energy
Volume162
Pages (from-to)1218-1224
Number of pages7
ISSN0306-2619
DOIs
Publication statusPublished - Jan 2016

Fingerprint

Cement industry
Kaolinite
footprint
Calcination
kaolinite
Clay
clay
dehydroxylation
porcellanite
Mullite
residence time
Dynamic models
cement industry
Concretes
Temperature
gas
modeling
particle
product
Gases

Keywords

  • Flash calcination
  • Kaolinite; Metakaolin
  • gPROMS
  • ; CO2 reduction

Cite this

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title = "Flash calcination of kaolinite rich clay and impact of process conditions on the quality of the calcines: A way to reduce CO2 footprint from cement industry",
abstract = "Use of properly calcined kaolinite rich clay (i.e., metakaolin) to offset part of CO2-intensive clinkers not only reduces CO2 footprint from cement industry but also improves the performance of concrete. However, calcination under inappropriately high temperatures or long retention times may deplete metakaolin into unwanted products (e.g., mullite), which limits the use of the calcines as a supplementary cementitious material. With this regard, a dynamic model of flash calcination of kaolinite rich clay particles is developed using gPROMS (general PROcess Modeling System) to predict the impacts of calcination temperature and residence time on the transformation of the clay particles and to derive a favorable production path that is able to achieve optimum amount of the desired product. Flash calcination tests of the kaolinite rich clay particles are also performed in a pilot-scale gas suspension calciner. The model is validated by the experimental data (e.g., the degree of dehydroxylation and the density of the calcines). Based on the model, the impacts of process conditions and feed properties on the quality of the calcination products are thoroughly examined.",
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Flash calcination of kaolinite rich clay and impact of process conditions on the quality of the calcines : A way to reduce CO2 footprint from cement industry. / Gebremariam, Abraham Teklay; Yin, Chungen; Rosendahl, Lasse.

In: Applied Energy, Vol. 162, 01.2016, p. 1218-1224.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Flash calcination of kaolinite rich clay and impact of process conditions on the quality of the calcines

T2 - A way to reduce CO2 footprint from cement industry

AU - Gebremariam, Abraham Teklay

AU - Yin, Chungen

AU - Rosendahl, Lasse

PY - 2016/1

Y1 - 2016/1

N2 - Use of properly calcined kaolinite rich clay (i.e., metakaolin) to offset part of CO2-intensive clinkers not only reduces CO2 footprint from cement industry but also improves the performance of concrete. However, calcination under inappropriately high temperatures or long retention times may deplete metakaolin into unwanted products (e.g., mullite), which limits the use of the calcines as a supplementary cementitious material. With this regard, a dynamic model of flash calcination of kaolinite rich clay particles is developed using gPROMS (general PROcess Modeling System) to predict the impacts of calcination temperature and residence time on the transformation of the clay particles and to derive a favorable production path that is able to achieve optimum amount of the desired product. Flash calcination tests of the kaolinite rich clay particles are also performed in a pilot-scale gas suspension calciner. The model is validated by the experimental data (e.g., the degree of dehydroxylation and the density of the calcines). Based on the model, the impacts of process conditions and feed properties on the quality of the calcination products are thoroughly examined.

AB - Use of properly calcined kaolinite rich clay (i.e., metakaolin) to offset part of CO2-intensive clinkers not only reduces CO2 footprint from cement industry but also improves the performance of concrete. However, calcination under inappropriately high temperatures or long retention times may deplete metakaolin into unwanted products (e.g., mullite), which limits the use of the calcines as a supplementary cementitious material. With this regard, a dynamic model of flash calcination of kaolinite rich clay particles is developed using gPROMS (general PROcess Modeling System) to predict the impacts of calcination temperature and residence time on the transformation of the clay particles and to derive a favorable production path that is able to achieve optimum amount of the desired product. Flash calcination tests of the kaolinite rich clay particles are also performed in a pilot-scale gas suspension calciner. The model is validated by the experimental data (e.g., the degree of dehydroxylation and the density of the calcines). Based on the model, the impacts of process conditions and feed properties on the quality of the calcination products are thoroughly examined.

KW - Flash calcination

KW - Kaolinite; Metakaolin

KW - gPROMS

KW - ; CO2 reduction

U2 - 10.1016/j.apenergy.2015.04.127

DO - 10.1016/j.apenergy.2015.04.127

M3 - Journal article

VL - 162

SP - 1218

EP - 1224

JO - Applied Energy

JF - Applied Energy

SN - 0306-2619

ER -