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Title:

ENVIRONMENTAL CHARACTERISTICS OF BY-PRODUCT GYPSUM

Accession Number:

00713583

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/issn/03611981

Abstract:

A family of by-product gypsum materials--such as flue gas desulfurization (FGD) gypsum, phosphogypsum (PG), fluorogypsum, titanogypsum, and disulfogypsum--is produced as a result of stringent environmental regulations or are inherent to the industrial processes themselves. From a mineralogical viewpoint, all these materials are calcium sulfate. However, they are produced as a result of different industrial processes. About 18 million Mg (20 million tons) of FGD gypsum and 54 million Mg (60 million tons) of PG are generated annually in the United States. Current stockpiled quantities of FGD gypsum and PG are about 136 and 726 million Mg (150 and 800 million tons), respectively. One major application for the use of these materials is in road base and subbase construction. Phosphogypsum, a by-product of phosphoric acid production, was investigated for the past 20 years in Florida, Louisiana, and Texas. However, as a result of the 1989 Environmental Protection Agency (EPA) regulations related to the disposal of phosphogypsum, limited research is being conducted on this material. FGD gypsum, a by-product of sulfur oxides emission control systems, is still being evaluated. Fluorogypsum, a coproduct of the production of hydrogen fluoride, is being successfully marketed as a base and subbase material in the Houston, Texas, area. There is little information about the use of titanogypsum and disulfogypsum. A summary of the mineralogical, morphological, physical, chemical, radiological, and leachate characteristics of PG, FGD gypsum, and fluorogypsum is presented. Where applicable, properties of these materials will be compared with EPA environmental standards.

Supplemental Notes:

This paper appears in Transportation Research Record No. 1486, Environmental Testing and Evaluation of Stabilized Wastes, Performance of Stabilized Materials, and New Aggregate Tests. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

Monograph Accession #:

01399784

Language:

English

Authors:

Taha, Ramzi
Seals, Roger
Tittlebaum, Marty
Saylak, Donald

Pagination:

p. 21-26

Publication Date:

1995

Serial:

Transportation Research Record

Issue Number: 1486
Publisher: Transportation Research Board
ISSN: 0361-1981

Features:

Figures (3) ; References (10) ; Tables (6)

Old TRIS Terms:

Subject Areas:

Environment; Geotechnology; Highways; Materials; I35: Miscellaneous Materials

Files:

TRIS, TRB

Created Date:

Nov 22 1995 12:00AM

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