Production of SO2 and Lime from Phosphogypsum Reduced with Lignite in a Nitrogen Atmosphere

Shao Cong Zheng; Fei Xiang Cheng; Zhi Juan Wang

doi:10.4028/www.scientific.net/AMR.803.94

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 803Production of SO2 and Lime from Phosphogypsum...

Production of SO₂and Lime from Phosphogypsum Reduced with Lignite in a Nitrogen Atmosphere

Abstract:

In this study, using lignite as a reducer, the reaction characteristic of the reduction decomposition of phosphogypsum to SO₂and lime was investigated in a nitrogen atmosphere at different conditions. Scanning electron microscopy and XRD-ray diffraction were used to analyze the solid production. The gas production of SO₂ was analyzed by the Gas Analyzers. The experiment results showed that the optimal conditions for production of SO₂ are founded to be a molar proportion of C:CaSO₄=0.8:1 and a decomposition temperature of over 1000°C.Under these conditions the maximum concentration of SO₂ reached to 8.23% (vol. %). The CaO content of solid production increased to 62.57%. The desulfurization rate of phosphogypsum reached to 95.16%.

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Periodical:

Advanced Materials Research (Volume 803)

Pages:

94-98

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.803.94

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Online since:

September 2013

Authors:

Shao Cong Zheng, Fei Xiang Cheng, Zhi Juan Wang

Keywords:

Lignite, Phosphogypsum, Reduced Decomposition, Sulfur Dioxide, Sulfur Lime

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