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

页码：47 / 51

页数：5

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