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Remedial Applications: Slag Disposal Sites

Overview

It is estimated that between 7 and 7.5 million metric tons of steel slag is produced each year in the United States.  Even though it can be recycled, slag is frequently sent to landfills for disposal.

In producing steel, iron ore is introduced into a blast furnace.  Slag is produced during the separation of the molten steel from impurities in the furnace, which is comprised of a complex solution of silicates and oxides that congeals upon cooling.  This slag is highly alkaline, with a pH between 9.5 and 11, and does not retain enough water for plants to germinate.

There are multiple forms of slag produced throughout the steel-making process:


Furnace & Tap
- produced during the initial stages and is the major source of slag aggregate

Raker
- generated by again adding fluxes to the ladle to melt

Pit & Cleanout
- consists of slag that falls onto the floor of the steel plant or removed from the ladle after tapping


Slag Disposal Site & Landfill Remediation Process

The procedure for cleaning up a landfill or site where slag has been disposed of can vary depending on many factors. It can be extremely costly, and some of these sites end up labeled as a Superfund, due to their high environmental threat levels.

A basic outline of the process would follow these general guidelines…
  • Environmental assessment
  • Removal of soil and debris
  • Disposing in a hazardous waste facility
  • Capping contaminated sediments with clean sediments
  • Erosion protection
  • Habitat restoration and redevelopment


To get information on how EnviroBlend can help in the remediation of Slag Disposal Sites - Click Here
 
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