Title page for ETD etd-01212009-152918


Document Type Doctoral Thesis
Author Nengovhela, Ryneth Nkhangweleni
Email ryneth.nengovhela@exxars.com
URN etd-01212009-152918
Document Title The recovery of sulphur from waste gypsum
Degree PhD
Department Chemistry
Supervisor
Advisor Name Title
Prof C A Strydom Co-Supervisor
Dr M Landman Supervisor
Keywords
  • sulphur
  • waste gypsum
Date 2008-09-03
Availability unrestricted
Abstract
Gypsum is produced as a waste product by various industries, e.g. the fertilizer industry, the mining industry and power stations. Gypsum waste disposal sites are responsible for the leaching of saline water into surface and underground water and create airborne dust. Gypsum waste is not only an environmental problem but has measurable economic value as well. However, all these environmental and economical concerns can be avoided should valuable/saleable by-products like sulphur and calcium carbonate be recovered from the low quality gypsum.

The aim of this project was to evaluate a process for converting waste gypsum into sulphur. The process evaluated consists of the following stages: reduction of gypsum to calcium sulphide; stripping of the sulphide with CO2 gas and the production of sulphur.

Thermal reduction study showed that gypsum can be reduced to CaS with activated carbon in a tube furnace operating at 1100 C. The CaS yield was 96%. The CaS formed was slurried in water. The reaction of gaseous CO2 with the CaS slurry leads to the stripping of sulphide to form H2S gas and the precipitation of CaCO3. The H2S generated was then reacted in the iron (IIII) and PIPco processes to form elemental sulphur.

Sulphur with the purity between 96% and 99% was recovered from waste gypsum in this study.

University of Pretoria 2008

D541/ag

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  01chapters1-2.pdf 371.76 Kb 00:01:43 00:00:53 00:00:46 00:00:23 00:00:01
  02chapters3-5.pdf 397.60 Kb 00:01:50 00:00:56 00:00:49 00:00:24 00:00:02
  03chapters6-7.pdf 579.53 Kb 00:02:40 00:01:22 00:01:12 00:00:36 00:00:03
  04references.pdf 130.47 Kb 00:00:36 00:00:18 00:00:16 00:00:08 < 00:00:01

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