Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Recovery of sulfur from phosphogypsum: conversion of calcium sulfide to sulfur.

Authors
Rice-DA; May-A; Carter-OC Jr.; Swanton-RG
Source
Trans Soc Min Metal Explor 1987 Jan; 284:1848-1854
Link
NIOSHTIC No.
10007345
Abstract
As part of a cooperative effort between the U.S. Bureau of Mines and the Florida Institute of Phosphate Research, with input from the phosphate industry, the conversion of phosphogypsum to sulfur is being investigated. The proposed process incorporates a thermal reduction of phosphogypsum to calcium sulfide (cas) and a hydrometallurgical treatmentto convert calcium sulfide to ammonium bisulfide (nh4sh), which is then oxidized using a catalyst to produce elemental sulfur. The paper summarizes the results of continuing laboratory studies using an activated carbon catalyst which was loaded with sulfur through oxidation of ammonium bisulfide solution. The extraction of the sulfur that forms in situ on the catalyst is a key area in the development of the sulfur recovery process. Two approaches for removing the sulfur are being investigated: (1) thermal treatment to volatilize sulfur and (2) leaching the sulfur using liquid anhydrous ammonia. The research has shown that it is technically feasible to recover over 90 pct of the sulfur from the carbon by either volatilization or ammonia leaching. Locked-cycle testing has demonstrated that the carbon has the potential to be recycled after ammonia leaching.
CODEN
TMENAE
Publication Date
19870101
Document Type
OP; Conference/Symposia Proceedings
Fiscal Year
1987
NTIS Accession No.
NTIS Price
ISBN No.
0873350847
Identifying No.
OP 192-89
ISSN
1075-8623
NIOSH Division
TURC
Source Name
Transactions of the Society for Mining, Metallurgy, and Exploration
State
AL; FL
TOP