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Limestone and dolomite powder as binders for wood ash agglomeration

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Abstract

Limestone and dolomite powder were tested as binders during wood ash agglomeration on an industrial and a laboratory scale. Two agglomeration methods are compared. Dolomite from Estonia is commonly used as a binder/additive during automatic production of agglomerated wood ash at the central heating plant of Kalmar, Sweden. Swedish limestones from Öland and Ignaberga as well as Swedish dolomite from Glanshammar were used as binders in the production of test agglomerates of wood ash. The chemical and mineralogical composition of the binders as well as of the resulting granules and pellets is presented. The structural, chemical and leaching properties of the hardened ash/binder agglomerates are discussed in relation to their possible environmental impact on forest soil. The environmental acceptance of recycling of agglomerated ashes to forest soils is also discussed in relation to the new recommendations.

Résumé

De la poudre de calcaire et de dolomite a été testée comme liant pour agglomérer de la cendre de bois à l’échelle du laboratoire et à une échelle industrielle. Deux méthodes d’agglomération sont comparées. De la dolomite d’Estonie est communément utilisée comme additif et liant lors de la production industrielle de cendres de bois agglomérées à la centrale thermique de Kalmar en Suède. Par ailleurs, les calcaires suédois de Öland et Ignaberga ainsi que les dolomies suédoises de Glanshammar ont été utilisés comme liants tests dans la production de cendres de bois agglomérées. Les compositions chimique et minéralogique des liants ainsi que des granules et pellets produits sont présentées. Les propriétés structurales, chimiques et de drainage des cendres de bois agglomérées et affermies par le liant sont analysées, par rapport à un impact environnemental possible sur des sols forestiers. Cet impact est discuté par référence aux nouvelles recommandations environnementales.

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Acknowledgements

The financial support from the KK Foundation and Graninge Kalmar Energi AB is acknowledged. Thanks to Mr Per Brändström for help in the laboratory and to Mr Arvo Suppi for hospitality during our visit in Estonia.

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Authors and Affiliations

  1. Department of Biology and Environmental Science, University of Kalmar, 391 82, Kalmar, Sweden

    S. L. Sarenbo & T. Claesson

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  1. S. L. Sarenbo
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  2. T. Claesson
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Correspondence to S. L. Sarenbo.

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Sarenbo, S.L., Claesson, T. Limestone and dolomite powder as binders for wood ash agglomeration. Bull Eng Geol Environ 63, 191–207 (2004). https://doi.org/10.1007/s10064-003-0223-4

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