One solution for resources recycling-reduction of So2 gas and Gypsum by waste plastics

Katsunori Yamaguchi*, Shigeru Ueda, Takahiko Okura

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution


This paper describes the new technologies for fixation of smelting So 2 gas as elemental sulphur and for converting gypsum to recycled calcium resource using waste organic materials. To produce nonferrous metals, the So2 gas is also generated from the raw materials such as sulphide or sulphate. A process that produces elemental sulphur from nonferrous smelter gas and waste plastics was investigated. Polyethylene was used as a deoxidiser of So2 gas in the present study. The conditions for reaction of So2 and polyethylene to make gas mixtures of H2S and So2 were calculated thermodynamically. The Claus reaction was applied to produce elemental sulphur from H2S and So2 gas mixture. More than 90 % sulphur recovered from So2 gas. A recycle of calcium resources as CaO or CaS from the waste gypsum was developed with a reduction process of the gypsum using plastics at high temperature. Reduction behaviour of CaSo 4 by polyethylene at temperature from 1,273 to 1,573 K was studied with gravimetry and X-ray diffraction analysis. From the experimental results, we found that complete reduction of CaSo4 to CaO can be done at the molar ratio more than 3/1 of CH2/CaSo4 for 2 h above 1,473 K, and increasing CaSo4-CH2 gas interface tend to advance the reduction of CaSo4.

Original languageEnglish
Title of host publicationProceedings - European Metallurgical Conference, EMC 2009
Number of pages12
Publication statusPublished - 2009 Dec 1
Externally publishedYes
Event5th European Metallurgical Conference, EMC 2009 - Innsbruck, Austria
Duration: 2009 Jun 282009 Jul 1

Publication series

NameProceedings - European Metallurgical Conference, EMC 2009


Conference5th European Metallurgical Conference, EMC 2009


  • Calcium
  • Gypsum
  • Nonferrous metals
  • Recycling
  • Reduction process
  • So-gas
  • Waste organic materials
  • Waste plastics

ASJC Scopus subject areas

  • Metals and Alloys


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