Calcium carbonate waste from an integrated pulp and paper mill as a potential liming agent |
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Authors: | R Pöykiö H Nurmesniemi |
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Institution: | (1) The Town Planning and Building Committee, The Environmental Research Division, City of Kemi, Valtakatu 26, 94100 Kemi, Finland;(2) Stora Enso Oyj, Veitsiluoto Mill, 94830 Kemi, Finland |
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Abstract: | Calcium carbonate is used in large amounts in the pulp and paper industry as a paper filler. When it is manufactured, the
calcium carbonate waste is purged from the process. Here we demonstrate that, due to the elevated calcium concentration of
168.5 g kg−1 dry weight (dw), alkaline pH of 12.6 and neutralizing (liming) effect value of 42.4% expressed as Ca equivalents, this waste
is a potential liming agent and a pH buffer. The heavy metal concentrations in the waste were lower than the new Finnish limit
values for fertilizers used in agriculture, as well as for a material, e.g. ash, used as an earth construction agent. These
limit values came into force in March 2007 and in June 2006, respectively. |
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Keywords: | PCC Calcium carbonate Waste Heavy metals |
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