Formation Characteristic of Calcium Sulfide by Reductive Decomposition of Calcium Sulfate

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  • 硫酸カルシウムの還元熱分解による硫化カルシウム生成特性
  • リュウサン カルシウム ノ カンゲン ネツ ブンカイ ニ ヨル リュウカ カルシウム セイセイ トクセイ

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Abstract

For the purpose of waste gypsum board recycling and selective generation of CaS, reductive decomposition behavior of CaSO4.2H2O under CO-CO2-N2 atmosphere was investigated by using a thermogravimetric analyzer.<BR>As a result, it was found that the reductive decomposition of CaSO4·2H2O to CaS in the presence of CO started at temperatures above 1023 K. However, at a temperature above 1173 K, CaS oxidation to CaO was observed and the oxidation was considered to proceed either by reaction of CaSO4 with CaS yielding CaO or by reaction of CaS with CO2 yielding CaO. Hence, to avoid the CaS oxidation, it was considered that the decomposition temperature should be kept below 1173 K. Furthermore, it was found that CaS generation increased with an increase in CO gas concentrations and the conversion of CaSO4.2H2O to CaS greater than 90% was obtained at a temperature of 1073 K, under CO : 10% and N2 : 90% atmosphere.

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