Heavy Metal Removal
Calomel Tower
The Calomel Process is a proven wet scrubbing technology designed for the efficient removal of elemental mercury from industrial process gases.
The calomel process for mercury removal
Widely used in non-ferrous metal production and metallurgical applications, the process converts mercury vapor into stable, solid calomel (mercurous chloride), enabling both environmental protection and potential mercury recovery.
Calomel tower process
The process is based on the reaction of elemental mercury vapor with a circulating solution of mercuric chloride (HgCl₂), converting the mercury into insoluble mercurous chloride, commonly known as calomel.
Mercury-containing process gas is introduced into a packed absorption Calomel tower, where it comes into contact with the recirculating mercuric chloride solution. Within the Calomel tower, mercury reacts with the absorbent and forms mercurous chloride, which precipitates from the liquid phase as a stable solid.
A side stream of the circulating solution is continuously directed to a primary settler, where the calomel solids are separated by gravity. The clarified liquid is returned to the absorption system, while the concentrated solids are transferred to a secondary settler for further thickening. If required, zinc dust can be added to enhance mercury precipitation and maximize recovery efficiency.
The concentrated calomel solids are then discharged for storage, recovery, sale, or further processing. Through this continuous scrubbing and separation process, mercury is effectively removed from the gas stream, enabling reliable compliance with stringent environmental regulations while supporting the recovery of valuable mercury-containing by-products.
Key benefits
- High-efficiency removal of elemental mercury from process gases
- Proven technology for non-ferrous metal and metallurgical industries
- Supports compliance with stringent environmental regulations
- Enables collection and recovery of mercury-containing by-products
- Reliable continuous operation with robust process design
- Can be integrated into existing gas cleaning systems
Downloads
GEA-inzichten
Reality check voor biotech
GEA's nieuwe Application and Technology Center (ATC) in Sarstedt, ten zuiden van Hannover, is geen showroom, maar ook geen vervanging voor een lab. Het is een plek voor testen, gegevensverzameling en vroege besluitvorming. Hier wordt duidelijk of een biologisch concept kan uitgroeien tot een robuust industrieel proces. Die stap is groter dan die lijkt.
Veranderingen op het gebied van verpakking van levensmiddelen: Vier trends
Thermovormen speelt al geruime tijd een centrale rol in de verpakking van levensmiddelen. Nu staat het voor een ingrijpende verandering. Naarmate de regelgeving strenger wordt, materialen zich verder ontwikkelen en de kosten stijgen, moeten vorm-, vul- en sluitlijnen meer doen dan alleen betrouwbaar functioneren – ze bepalen nu hoe voedingsmiddelen vers, betaalbaar en recyclebaar blijven. Bekijk de belangrijkste trends op het gebied van thermovormen die bepalend zijn de verpakking en bezorging van levensmiddelen.
