Flue Gas Treatment
Flue Gas Treatment
Flue gas treatment is a process designed to reduce the amount of pollutants emitted from the burning of fossil fuels at an industrial facility, a power plant, or another source. Sulfur (SOx) and Nitrogen (NOx) oxides are the major gaseous pollutants. Currently, these pollutants are treated by flue gas desulfurization (SOx removal) and selective catalytic reduction (NOx removal) processes.
Flue gas desulfurization process involves several types of technical routes, among which wet desulphurization (wet scrubbing system) dominates the whole field. Wet scrubber uses a slurry of alkaline sorbent to scrub gases in a reaction tank where the SO2-alkali reaction is completed forming a neutral salt. In a regenerable system, the spent slurry is recycled back to the absorber. Once-through systems dewater the spent slurry for disposal or use as a by-product.
Typical sorbent raw material of wet desulphurization is limestone or lime or caustic soda. However, Magnesium Hydroxide, as an efficient alkaline sorbent, has a broad application prospect because of its comparative advantages as follow:
• More alkalinity and less sludge
Magnesium Hydroxide has an alkalinity about 27% more than hydrated lime and 37% more than caustic soda on an equal weight basis. Magnesium Hydroxide method produces much less sludge than lime method. These mean costs reduction on alkali consumption and sludge handling. It is the most cost-effective alkali.
• More benefit from by-product
The by-product of Magnesium Hydroxide method is magnesium sulfate which can be used as a good fertilizer. The recovery value is higher than calcium sulfate (by-product of lime method) and sodium sulfate (by-product of caustic soda).
• Environmentally friendly
Magnesium Hydroxide and its slurry are non-toxic (when properly used), non-corrosive, non-hazardous and much safer to handle than caustic soda and lime. That means costs reduction on transport, storage and management as well.
IMC offers customers high-grade magnesium hydroxide slurries with low carbon footprint for flue gas treatment.
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