Fly ash carbon separation and ammonia removal in Florida

Abstract

A company operates fly ash beneficiation facilities that produce high quality pozzolan from poor quality fly ash. A patented electrostatic separation process reduces the carbon content of fly ash to produce a low loss on ignition (LOI) product used as a portland cement replacement in concrete products. Additionally, a high carbon content product stream is produced and is returned to utilities to recover fuel value or to cement kilns as a fuel and raw material. Two processing facilities have been commissioned in Florida; one in Tampa and another in Jacksonville. Both installations also include a patented ammonia removal process that reduces ammonia content on the fly ash from levels of greater than 2000 ppm to levels less than 75 ppm. The Tampa facility includes three separators, an ammonia removal process, two concrete slip-form product silos and a 25,000-ton dome. The plant is capable of processing 350,000 tons of fly ash per year. The Jacksonville installation contains two separators and an ammonia removal process capable of processing 300,000 tons per year. Twelve (12) ash beneficiation facilities have been commissioned in North America, the United Kingdom and Poland along with two mineral processing facilities in Europe and Canada.