Production of precipitated calcium carbonate from calcium silicates and carbon dioxide
Production of precipitated calcium carbonate from calcium silicates and carbon dioxide
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DOI：
10.1016/j.enconman.2005.02.009
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发表时间：
2005-11-01
影响因子：
10.4
通讯作者：
Zevenhoven, R
中科院分区：
文献类型：
--
作者：
Teir, S;Eloneva, S;Zevenhoven, R
介绍了通过碳酸钙化减少纸浆和造纸工业二氧化碳排放的可能性。目前的沉淀碳酸钙（PCC）生产使用开采的、粉碎的碳酸钙作为原料。如果改用硅酸钙，则可消除碳酸盐煅烧过程中的二氧化碳排放。因此，在芬兰，仅考虑纸浆和造纸工业中使用的PCC，每年就有可能减少200 kt的二氧化碳排放量。初步探讨了以硅酸钙为原料生产轻质碳酸钙的可行性及替代碳酸钙的潜力。碳酸钙可以通过各种方法从硅酸钙中生产，但只有少数经过实验验证。通过使用HSC软件的热力学平衡计算和使用白杨Plus（（R））的过程建模，研究了这些方法作为当前PCC生产工艺的替代的可能性和可行性。过程建模的结果表明，使用乙酸提取钙离子的过程是通过矿物碳酸化螯合二氧化碳的高潜力选择。主要障碍似乎是硅灰石的供应有限和价格相对较高，硅灰石是一种硅酸钙含量高的矿物。另一种方法是使用更常见但也更复杂的玄武岩。(c)2005爱思唯尔有限公司保留所有权利。
The possibilities for reducing carbon dioxide emissions from the pulp and paper industry by calcium carbonation are presented. The current precipitated calcium carbonate (PCC) production uses mined, crushed calcium carbonate as raw materials. If calcium silicates were used instead, carbon dioxide emissions from the calcination of carbonates would be eliminated. In Finland, there could, thus, be a potential for eliminating 200 kt of carbon dioxide emissions per year, considering only the PCC used in the pulp and paper industry. A preliminary investigation of the feasibility to produce PCC from calcium silicates and the potential to replace calcium carbonate as the raw material was made. Calcium carbonate can be manufactured from calcium silicates by various methods, but only a few have been experimentally verified. The possibility and feasibility of these methods as a replacement for the current PCC production process was studied by thermodynamic equilibrium calculations using HSC software and process modelling using Aspen Plus((R)). The results from the process modelling showed that a process that uses acetic acid for extraction of the calcium ions is a high potential option for sequestering carbon dioxide by mineral carbonation. The main obstacle seems to be the limited availability and relatively high price of wollastonite, which is a mineral with high calcium silicate content. An alternative is to use the more common, but also more complex, basalt rock instead. (c) 2005 Elsevier Ltd. All rights reserved.