Title:
METHOD FOR IMMOBILIZING ARSENIC, AND ARSENIC-CONTAINING VITRIFIED WASTE
Document Type and Number:
WIPO Patent Application WO/2017/110877
Kind Code:
A1
Abstract:
Provided is a method for immobilizing arsenic characterized in that calcium arsenate is added to a vitrification material that contains iron, silica, and alkali components so as to reach an iron/silica weight ratio of 0.5-0.9 and an alkali component content of 14-26 wt%. For example, the method for immobilizing arsenic may comprise adding an alkali solution and an oxidizing agent to a copper-arsenate-containing solution and carrying out oxidizing leaching, separating the leach residue into a solid and a liquid, adding slaked lime to the recovered alkali arsenate solution and generating calcium arsenate, and adding the vitrification material to the recovered calcium arsenate so as to reach the desired iron/silica weight ratio and alkali component content and changing the arsenic into vitrified waste.
Inventors:
NABEI ATSUHIRO (JP)
MIRUVARIEFU RINATO (JP)
MIRUVARIEFU RINATO (JP)
Application Number:
PCT/JP2016/088108
Publication Date:
June 29, 2017
Filing Date:
December 21, 2016
Export Citation:
Assignee:
MITSUBISHI MATERIALS CORP (JP)
International Classes:
C22B30/04; C02F1/62; C02F11/00; C22B3/12; C22B3/22
Domestic Patent References:
| WO2014059535A1 | 2014-04-24 |
Foreign References:
| CN102965517A | 2013-03-13 |
Other References:
TIMMONS, DALE M. ET AL.: "Vitrification Tested on Hazardous Wastes", POLLUTION ENGINEERING, vol. 22, no. 6, June 1990 (1990-06-01), pages 76 - 81, XP009511497, ISSN: 0032-3640
SWASH,P.M ET AL.: "Comparison of the Solubilities of Arsenic-Bearing Wastes from Hydrometallurgical and Pyrometallurgical Processes", SLAGS IN METALLURGY, March 1999 (1999-03-01), XP055492999
HIROTO OTAKI ET AL.: "Development of Heavy Weight-FRCC using copper slag", PROCEEDINGS OF AIJ TOHOKU CHAPTER ARCHITECTURAL RESEARCH MEETING, June 2014 (2014-06-01), pages 157 - 160, XP009512038, ISSN: 1345-6687
SWASH,P.M ET AL.: "Comparison of the Solubilities of Arsenic-Bearing Wastes from Hydrometallurgical and Pyrometallurgical Processes", SLAGS IN METALLURGY, March 1999 (1999-03-01), XP055492999
HIROTO OTAKI ET AL.: "Development of Heavy Weight-FRCC using copper slag", PROCEEDINGS OF AIJ TOHOKU CHAPTER ARCHITECTURAL RESEARCH MEETING, June 2014 (2014-06-01), pages 157 - 160, XP009512038, ISSN: 1345-6687
Attorney, Agent or Firm:
SHIGA Masatake et al. (JP)
Download PDF: