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Article
Decomposition of Calcium Sulfate in a Two-Zone Reactor
Industrial & Engineering Chemistry Process Design and Development
  • William M. Swift, Iowa State University
  • Thomas D. Wheelock, Iowa State University
Document Type
Article
Publication Version
Published Version
Publication Date
1-1-1975
DOI
10.1021/i260055a022
Abstract
A new method of decomposing calcium sulfate has been demonstrated with a bench-scale fluidized bed reactor in which two reaction zones were established. A reducing zone was set up in the lower part of the reactor by partial combustion of natural gas and an oxiding zone in the upper part by the addition of secondary air. Through natural circulation in such a system. the solids were alternately reduced and oxidized. Both gypsum and anhydrite were decomposed in a continuous manner at temperatures ranging from 1910 to 2230°F. With temperatures of 2100°F and higher, the solids were 98 to 99% desulfurized, and with lower temperatures, the solids were desulfurized less. However, conversion to calcium sulfide was almost completely avoided over the whole temperature range. The process shows promise for treating waste and byproduct forms of calcium sulfate as well as natural minerals.
Comments

Reprinted (adapted) with permission from Ind. Eng. Chem. Process Des. Dev., 1975, 14 (3), pp 323–327. Copyright 1975 American Chemical Society.

Copyright Owner
American Chemical Society
Language
en
File Format
application/pdf
Citation Information
William M. Swift and Thomas D. Wheelock. "Decomposition of Calcium Sulfate in a Two-Zone Reactor" Industrial & Engineering Chemistry Process Design and Development Vol. 14 Iss. 3 (1975) p. 323 - 327
Available at: http://works.bepress.com/thomas-wheelock/29/