Key benefits

• Easy installation
• Low operating costs
• Proven Performance

How it works 

In the raw mill system, dust captured in the main baghouse acts as a natural adsorbent for mercury. This mercury enriched dust that is captured in the main baghouse is taken to the new mercury roaster process for cleaning before the dust is returned back to the system.


The baghouse dust is fed to a roasting system which uses a heat source (for example kiln bypass gas, cooler vent gas, or hot gas generator) to heat the dust above the boiling point of mercury compounds. While the mercury is still in the gas phase, the gas enters a hot electrostatic precipitator which removes most of the cleaned dust. The dust is taken back to the blending silo to be part of the kiln feed. After the electrostatic precipitator, the gas stream is cooled below the mercury boiling point so that the mercury can condense on the dust particles that were not captured in the electrostatic precipitator.

Minimized Total Cost of Ownership

Through extensive laboratory testing, the Mercury Roaster has successfully demonstrated its ability to reduce mercury emissions. In addition, because the air and sorbent flows are significantly smaller than would be seen with a full ACI system, the operating costs are significantly reduced.

Easy Installation

The Mercury Roaster requires a much smaller installation footprint than competing technologies and can be applied even in applications that cannot accommodate a large baghouse.

Options

An adsorbent may also be added to the gas stream here, as needed, to help capture the mercury. The cleaned gas after the baghouse is vented to the atmosphere and the mercury enriched dust/adsorbent collected in the baghouse can be transported to the finish mill to be added to the cement. In some cases, the baghouse dust may need to be removed as a waste stream.