Journal of South China University of Technology (Natural Science Edition) ›› 2007, Vol. 35 ›› Issue (5): 94-99.

• Chemistry & Chemical Engineering • Previous Articles     Next Articles

Thermodynamic Analysis of Microcline-CaSO4 -CaCO3 System

Shi Lin1  Chen Ding-sheng2   

  1. 1. School of Environmental Science and Engineering , South China Univ. of Tech. , Guangzhou 510640 , Guangdong , China;2. South China Institute of Environmental Sciences , State Environmental Protection Administration , Guangzhou 510655 , Guangdong, China
  • Received:2006-03-10 Online:2007-05-25 Published:2007-05-25
  • Contact: 石林(1963-)，男，教授，主要从事固体废弃物与非金属矿的综合利用和燃煤锅炉二氧化硫污染治理方面的研究。 E-mail:celshi@scut.edu.cn
  • About author:石林(1963-)，男，教授，主要从事固体废弃物与非金属矿的综合利用和燃煤锅炉二氧化硫污染治理方面的研究。
  • Supported by:

    国家星火计划项目(2006EA10501 7) ;广州市污染防治新技术新工艺研究开发项目(2006440003121132)

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Abstract:

In order to produce soluble potash fertilizer by means of calcination , the thermodynamic analysis and ex-perimental research about the pyrolysis reaction of microcline-CaSO4 -CaCO3 system were carried out. The results in-dicate that , for CaO-SiO2 , CaO-Al2O3 , SiO2-Al2O3 and CaO-SiO2-Al2O3 systems , 2CaO • SiO2 and 2CaO • Al2O3 • SiO2 will first generate in CaO-rich area during the process of solid-phase thermal decomposition reaction , and that the calcined products will further transfer into 2CaO • SiO2 and 3CaO • Al2O3 with the increase of CaCO3 content. According to such a trend , the best molar ratio of microcline: CaSO4 : CaCO3 is 1: 1: 14 , which is further validated by experiments.

Key words: microcline, calcium sulfate, calcium carbonate, temary system, thermodynamic analysis, potash fertilizer