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Is Coal Fly Ash a Suitable Alkaline Resource for Manufacturing New Calcium Carbonate–based Cements? ; A Systems Analytical Evaluation

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At present, the production of cement contributes approximately 8% to global carbon
dioxide (CO2) emissions, whereas a further increase in the future is expected. To reduce
these emissions, a prominent measure of the cement industry is to use materials such as
coal fly ash (CFA) as a cement substitute, but the availability of qualified ash is limited. The
development of “green cements” with lower CO2 emissions attracts attention within the
cement industry and politics. Recently, a new invention for a calcium carbonate (CaCO3)-
based cement intends to use CFA as an alkaline resource during a manufacturing process
based on CO2 mineralization converting anthropogenic CO2 into stable calcareous materials
by using calcium-bearing brines. In our systems analysis, we demonstrate that the
alkalinity of CFA usable for mass production of cements is poor. The alkalinity of CFA primarily
depends on the dissolution of free lime. For CO2 mineralization, the resulting alkalinity is
just sufficient to precipitate the calcium supplied by the CFA itself, and the capacity of CO2
mineralization is low. Thus, CFA could only be used as a supplementary resource. Even at
locations where exceptional calcium-rich ash is available, very large amounts of ash must
be processed. Globally, only a few million tonnes of calcium could be extracted in this way.
Because qualified CFA is already used in the construction industry, the extraction of calcium
from nonqualified, more polluted CFA is associated with a risk of unwanted environmental
effects and implies an elaborated pollutant control.

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Informasi Detail

Judul Seri

Journal of Industrial Ecology

No. Panggil

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Penerbit

Yale University : ., 2014

Deskripsi Fisik

Journal of Industrial Ecology: Volume 19, Number 1, 2014

Bahasa

English

ISBN/ISSN

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Klasifikasi

NONE

Tipe Isi

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Tipe Media

other

Tipe Pembawa

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Edisi

Volume 19, Number 1, 2014

Subjek

EKOLOGI INDUSTRI

Info Detail Spesifik

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Pernyataan Tanggungjawab

Gusti

Versi lain/terkait

Lampiran Berkas

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