NDLI: Calcium Sulfite Oxidation and Crystal Growth in the Process of Calcium Carbide Residue to Produce Gypsum

Content Provider	Springer Nature Link
Author	Li, Yuran Zhou, Jinting Zhu, Tingyu Jing, Pengfei
Copyright Year	2013
Abstract	Calcium carbide residue mainly composed of Ca(OH)$_{2}$ can be used in wet flue gas desulfurization (FGD). Different from the traditional limestone–gypsum wet FGD, calcium carbide residue rapidly reacts with SO$_{2}$ and generates numerous fine particulates. For the fine calcium sulfite particulates, the oxidation rate to CaSO$_{4}$ is much lower than the sulfite formation rate, resulting in a low fraction of CaSO$_{4}$ in the product and a difficult dewatering of the sludge. In order to improve the oxidation rate and the fraction of CaSO$_{4}$ in the product, experiments of the calcium sulfite oxidation were conducted in a cylindrical flat-bottomed bottle placed in a water bath. The optimal oxidation reaction conditions are obtained: pH = 4.0, T = 60 °C. Four metal ions, Mn$^{2+}$, Fe$^{3+}$, Cu$^{2+}$ and Co$^{2+}$ are added in the slurry to improve the oxidation rate. The results show that only Mn$^{2+}$ ion, or Mn$^{2+}$ and Fe$^{3+}$ ions together can obviously increase the oxidation rate. The products with Mn$^{2+}$ and Fe$^{3+}$ additives are observed as needle-like crystallites. The co-precipitation compound detected in the products indicates that the sulfite oxidation rate is relatively low for Fe$^{3+}$ and Co$^{2+}$ additives. Mn$^{2+}$ additive is an excellent additive due to a high oxidation rate and a needle-like crystallite for the product, and can be recycled many times.
Starting Page	125
Ending Page	131
Page Count	7
File Format	PDF
ISSN	18772641
Journal	Waste and Biomass Valorization
Volume Number	5
Issue Number	1
e-ISSN	1877265X
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-02-21
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Calcium carbide residue Calcium sulfite Oxidation rate Gypsum Crystal growth Engineering Environment Renewable and Green Energy Industrial Pollution Prevention Waste Management/Waste Technology Environmental Engineering/Biotechnology
Content Type	Text
Resource Type	Article
Subject	Waste Management and Disposal Environmental Engineering Renewable Energy, Sustainability and the Environment

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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