Calcium carbonate waste from an integrated pulp and paper mill as a potential liming agent

被引：30
作者：
Poeykioe, R. [1 ]
Nurmesniemi, H. [2 ]
机构：
[1] Town Planning & Bldg Comm, Div Environm Res, Kemi 94100, Finland
[2] Stora Enso Oyj, Veitsiluoto Mill, Kemi 94830, Finland
来源：
ENVIRONMENTAL CHEMISTRY LETTERS | 2008年 / 6卷 / 01期
关键词：
PCC; calcium carbonate; waste; heavy metals;
D O I：
10.1007/s10311-007-0110-5
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
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)supercript stop 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.
引用
收藏
页码：47 / 51
页数：5
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