Report of Investigations 9297: Recovery of Sulfur from Phosphogypsum: Conversion of Calcium Sulfide to Sulfur

Details

• Journal Article:
  Recovery of sulfur from phosphogypsum: conversion of calcium sulfide to sulfur
• Personal Author:
  Carter, Olice C. Jr. ; May, Alexander ; Ragin, Margaret M. ; Rice, David A. ; Swanton, Robert G. ; Carter, Olice C. Jr. ; May, Alexander ; Ragin, Margaret M. ; Rice, David A. ; Swanton, Robert G.
• Description:
  As part of a cooperative effort between the Bureau of Mines and the Florida Institute of Phosphate Research (FIPR), with input from the phosphate industry, the conversion of phosphogypsum to sulfur is being investigated. The proposed process incorporates the thermal reduction of phosphogypsum to calcium sulfide (CaS) and a hydrometallurgical treatment to convert calcium sulfide to sulfur. The research described herein is focused on the latter half of the process. It was demonstrated that calcium sulfide could be converted to ammonium bisulfide (NH4SH), and that ammonium bisulfide could be oxidized by air in the presence of a catalyst to elemental sulfur, which was adsorbed on the catalyst. Two methods for recovering sulfur from the catalyst were developed: (1) thermal treatment to volatilize sulfur, and (2) leaching the sulfur from the catalyst with liquid anhydrous ammonia. Over 90 pct of the sulfur adsorbed on activated carbon (the catalyst) was recovered by both methods. Based upon the encouraging laboratory investigations, a hydrometallurgical scheme was proposed for the overall conversion of calcium sulfide to elemental sulfur. [Description provided by NIOSH]
• Subjects:
  Chemistry Mining Occupational Health Safety Sulfur Temperature
• Keywords:
  Carbon; Tables-Data; Graphs-Charts; Temperature; Chemical-reactions; Sulfur; Mining; Materials-recovery
• Source:
  Tuscaloosa, AL: U.S. Department of the Interior, Bureau of Mines, RI 9297, 1990 Jan; :1-15 ; Tuscaloosa, AL: U.S. Department of the Interior, Bureau of Mines, RI 9297, 1990 Jan; :1-15
• Series:
  NIOSH Numbered Publications   ; Mining Publications   ; NIOSH Numbered Publications   ; Mining Publications  
• Subseries:
  Report of Investigations ; Report of Investigations
• Document Type:
  Text
• Genre:
  Report ; Report
• Place as Subject:
  Alabama ; Florida ; OSHA Region 4
• CIO:
  National Institute for Occupational Safety and Health (NIOSH) ; National Institute for Occupational Safety and Health (NIOSH)
• Division:
  TURC - Tuscaloosa Research Center ; TURC - Tuscaloosa Research Center
• Topic:
  Workplace Safety & Health ; Workplace Safety & Health
• Location:
  North America ; North America
• Pages in Document:
  21 pdf pages
• NIOSHTIC Number:
  nn:10007493
• NTIS Accession Number:
  PB90-225897
• Federal Fiscal Year:
  1990
• Peer Reviewed:
  False
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:2e970a97e30980bcdad43c5635f1f21e7874478cb93d46d12c800ab65bbfd3c54a4eb5511fb9dbe722bc68be91087783ca483f3319744a15601a31179383fc60
• Download URL:
  https://stacks.cdc.gov/view/cdc/10671/cdc_10671_DS1.pdf
• File Type:
  [PDF - 1.54 MB ]