S.a. Lhoist Recherche Et Developpement

S. A. Lhoist Recherche Et Developpment

Amandine Gambin

Alain Laudet

Olivier Francoisse

The invention relates to a powder composition based on a calcium/magn&#xe9;sium compound having formula (I), xCaA.(1&#x2212;x)[yMgA+(1&#x2212;y)MgO], in which A is a group &#x2550;(OH)or &#x2550;COand x and y are mole fractions where 0&#x3c;x=1 and 0=y=1, containing an amount of mineral solid flow agent that is less than 5 wt.-% of the composition, said agent being selected from the group containing vermiculite, perlite, diatomaceous earth and silica, in the form of particles having a size greater than 90 &#x3bc;m.

Powdery composition based on a calco-magnesian compound

Powdered lime composition having a BET specific surface area that is equal to or greater than 25 m/g and a BJH total pore volume obtained from nitrogen desorption that is equal to or greater than 0.1 cm/g, and furthermore comprising an alkali metal. The alkali metal content is equal to or greater than 0.2% and equal to or less than 3.5% based on the total weight of the composition. There is also described a method of preparing the composition and use thereof to reduce flue gases.

Powdered lime composition, method of preparing same and use thereof

A method for reducing heavy metals, in particular in mercury, present in flue gases, includes the step of bringing the flue gases into contact with a particular class of sorbent material in the dry state. A preferred class of dry sorbent materials can be provided from a mineral compound selected from among halloysites and phyllosilicates of the palygorskite subgroup and the sepiolite subgroup of the palygorskite-sepiolite group according to the Dana classification. Mineral compounds of this group have been shown to provide a reduction in heavy metals, in particular in mercury, present in flue gases.

Growing community of inventors

Ternuay, France

Amandine Gambin