Control the pollutants that drive your compliance strategy
Managing regulated pollutants in industrial flue gases is essential to protect equipment integrity, control corrosion and meet evolving environmental requirements. At Lhoist, we help you control these emissions with high‑performance lime‑based sorbents and mineral reagents. Our experts work with you to identify critical pollutants, assess process conditions, and recommend the most efficient and cost‑effective treatment strategy.
Key pollutants to be treated
Sulphur Dioxide (SO2)
SO2 is an acid gas produced when burning sulphur‑containing fuels. It is toxic, has a sharp odor, and irritates the respiratory system.
Our treatment solution:
Calcium‑based products - limestone (CaCO3), quicklime (CaO) or hydrated lime (Ca(OH)2) - are widely used to control SO2 emissions. Because each sorbent performs differently depending on the process, the final choice will be tailored to your operating conditions and requirements to ensure the best balance between investment and operating costs. At Lhoist, we help you select the optimal calcium reagent for your installation to achieve high- efficiency SO2 removal, cost‑effective operation and long‑term regulatory compliance.
Hydrogen Chloride (HCl)
HCl is a corrosive and toxic acid gas commonly present in waste‑to‑energy and industrial combustion processes.
Our treatment solution:
Hydrated lime is the reference reagent in dry sorbent injection systems, delivering consistently high HCl removal efficiency. Other lime‑based sorbents can also capture HCl effectively, providing additional flexibility depending on process conditions and performance requirements. Industrial operations worldwide can achieve HCl capture rates above 98%, even under challenging operating conditions. In Waste-to-Energy plants, our solutions routinely achieve high HCl removal, helping operators meet strict regulatory limits with confidence. We adapt our solution to your flue gas treatment installation, helping you achieve reliable, cost‑effective compliance and sustained operational performance.
Hydrogen Fluoride (HF)
HF is a corrosive, irritating and toxic gas. When present in flue gas, HF reacts readily with hydrated lime, supporting efficient capture.
Our treatment solution:
Our calcium‑based sorbents can remove HF emissions in both dry and semi‑wet processes, delivering the high performance required in demanding industrial environments. All our calcium reagents capture HF effectively: the optimal choice depends on your specific operating conditions and removal targets. Hydrated lime delivers higher HF capture than sodium‑based sorbents such as sodium bicarbonate, making it the preferred option when stringent emission limits apply. In glass manufacturing and other HF-intensive applications, our sorbents support stable removal performance and help operators meet regulatory requirements reliably.
Sulphur Trioxide (SO3)
SO3 is typically encountered as a gas. It reacts with moisture to form corrosive sulfuric acid. Effective SO3 capture reduces corrosion risk and supports safe operating conditions.
Our treatment solution:
Dry calcium hydroxide products are widely used to capture SO3, helping reduce visible plume and prevent operational issues associated with this pollutant. Hydrated lime is generally effective in controlling SO3 concentrations within typical operating ranges. For installations requiring very low SO3 levels, more advanced calcium‑based products provide the enhanced performance needed to reach these stringent limits.
Selenium Dioxide (SeO2)
SeO2 is a toxic acid gas present in small but regulated concentrations in certain industrial emissions. In facilities burning selenium-containing fuels, SeO2 can be effectively removed from the flue gas using dry sorbent injection technologies.
Our treatment solution:
For SeO2 removal, calcium‑based reagents such as quicklime (CaO) or hydrated lime (Ca(OH)2) are the most effective options. Selenium compounds form more stable bonds with calcium sorbents than with sodium‑based alternatives, ensuring reliable capture and safer operation. The optimal calcium sorbent depends on your specific capture process and installation design. At Lhoist, we help you select the appropriate reagent and treatment approach to ensure efficient SeO2 neutralization, and consistent regulatory compliance.
Micro-pollutants to be treated
In addition to major acid gases, many industries must control micro‑pollutants; highly regulated substances present at very low concentrations that require high removal efficiency. Lhoist provides mineral sorbents and specialized solutions designed to deliver high performance while eliminating the smoldering and handling risks associated with carbon‑based sorbents.
Mercury (Hg)
Mercury (Hg0, Hg2+) - liquid at standard temperature and pressure conditions - is highly toxic through ingestion or inhalation.
Dioxins & Furans (PCDD/PCDF)
Dioxins and furans are extremely toxic, persistent organic pollutants formed during combustion. They are regulated at very low concentrations, requiring highly efficient sorbents to ensure compliance.
Our solution for micro-pollutants
In dry sorbent injection (DSI) systems, mercury, dioxins and furans are captured through physical adsorption on high‑surface‑area sorbents. These typically include activated carbon, lignite coke, or engineered mineral blends designed for efficient micro‑pollutant removal. At Lhoist, we offer a broad range of mineral‑based blends, that can include hydrated lime (Ca(OH)2) and engineered sorbents, tailored to the specific needs of your flue gas treatment installation.
Our solutions provide a simple, flexible, and cost‑effective way to remove micro‑pollutants such as dioxins and furans, or mercury, while also treating acidic gases, helping you achieve compliant emissions without adding operational complexity.
Why choose Lhoist for flue gas treatment?
