Valuable Products from Coal Burning Wastes

EPA Contract Number: 68D00037
Title: Valuable Products from Coal Burning Wastes
Investigators: Laird, Douglas H.
Small Business: Science Ventures Inc.
EPA Contact: Manager, SBIR Program
Phase: I
Project Period: July 1, 1990 through January 1, 1991
Project Amount: $50,000
RFA: Small Business Innovation Research (SBIR) - Phase I (1990) RFA Text |  Recipients Lists
Research Category: SBIR - Pollution Prevention , Pollution Prevention/Sustainable Development , Small Business Innovation Research (SBIR)


Coal combustion flue gas that is desulfurized with lime or limestone results in 30-35 million tons per year of gypsum- like waste. This presents a disposal problem which could be eliminated by conversion into marketable commodities.

Science Ventures has been experimenting with a new high- speed chemical process to solve a related environmental problem. Their FLASC process recovers sulfur values from phosphogypsum for recycle to the wet phosphoric acid process. Synthetic aggregate for concrete is produced.

The proposed process would use similar entrained, stagging, mildly reducing conditions and equipment to produce cement and sulfuric acid for sale. Some of the coal ash would also be consumed this way.

Very fast conversion rates of these processes promise re- duced capital costs per unit of products. In addition, fresh FGD waste requires substantially less fuel than do natural or other byproduct gypsums.

Phase I crucible tests will prove cement quality, and test the practicality of entrained stagging equipment. If results are positive, Phase II can progress rapidly using existing bench scale apparatus.

Supplemental Keywords:

RFA, Scientific Discipline, Air, Toxics, Waste, Sustainable Industry/Business, exploratory air engineering, Chemical Engineering, air toxics, cleaner production/pollution prevention, Environmental Chemistry, Chemistry, HAPS, VOCs, Technology for Sustainable Environment, Incineration/Combustion, Engineering, Engineering, Chemistry, & Physics, Environmental Engineering, in-process changes, ambient air quality, desulfurization, combustion byproducts, cleaner production, chemical use efficiency, air pollutants, waste minimization, waste reduction, sulfur recovery and reuse, clean technology, pollution control technologies, Sulfur dioxide, sulfur concrete, sulfur dioxide (SO2), flue gas, sulfur, combustion, sulfur recovery, coal combustion, pollution prevention, sulfer oxide, coal fired power plants, green technology, Sulfur Oxides (SO2), atmospheric chemistry, coal combustion waste, combustion waste recovery

Progress and Final Reports:

  • Final