Highly porous powdered slaked lime composition

Patent metadata

Field	Value
Publication number	US-11185841-B2
Application number	US-201716309561-A
Country	US
Kind code	B2
Filing date	Jun 23, 2017
Priority date	Jun 24, 2016
Publication date	Nov 30, 2021
Grant date	Nov 30, 2021

Abstract

The present invention concerns a powdery slaked lime composition having an Alpine fluidity greater than 50% and including a first fraction of particles having a size less than 32 μm and a second fraction of particles with the size greater than 32 μm, the second fraction being less than 10% by weight, compared to the total weight of the composition. The invention also relates to a method for producing same.

First claim

The invention claimed is:

1. Powdery slaked lime composition having a BET specific surface, obtained by nitrogen adsorption, greater than or equal to 25 m 2 /g and a total BJH pore volume, constituted of pores the diameters of which are less than 1000 Å, obtained by nitrogen desorption, greater than or equal to 0.15 cm 3 /g, characterised in that this composition possesses in addition an Alpine fluidity greater than 50%, the Alpine fluidity AF being defined by the equation:

AF
=

m
i

-

m

R
⁢

⁢
90
⁢

(

T
⁢

⁢
15

;

P
⁢

⁢
100

)

m
i

-

m

R
⁢

⁢
90
⁢

(

T
⁢

⁢
120

;

P
⁢

⁢
150

)

·
100

⁢

⁢
%

where:
m i is an initial mass of 50 g of powder spread over a 90 μm sieve;
m R90(T15;P100) is a mass of residues of material left on the sieve after 15 seconds with a depression of 100 mm of manometric liquid, the density of which is 0.88;
m R90(T120;P150) is a mass of residues of material left on the sieve after 15 seconds with a depression of 100 mm of manometric liquid, the density of which is 0.88, and after 120 seconds with the depression at 150 mm of manometric liquid with a density of 0.88;

and the aforementioned composition includes a first fraction of particles having a size less than 32 μm and a second fraction of particles with the size greater than 32 μm, the second fraction of particles being less than 10% by weight, compared to the total weight of the composition, said powdery slaked lime composition further comprises residual organic solid additives coming from organic additives selected from the group consisting of mono- or poly-ethylene glycol and their mixtures.

2. The powdery slaked lime composition according to claim 1 , presenting in addition a non-solid residual phase content, measured by a loss of ignition test at 180° C., greater than or equal to 0.3% compared to the total weight of powdery slaked lime composition.

3. Powdery slaked lime composition according to claim 2 , in which the said non-solid residual phase includes water and/or residual additives, such residual additives being inorganic and/or organic additives, free or linked to the lime compound.

4. The powdery slaked lime composition according to claim 1 , presenting in addition a non-solid content in residual phase, measured by a loss of ignition test at 110° C., less than or equal to 3.5% by weight and greater than 0% by weight compared to the total weight of the powdery slaked lime composition.

5. The powdery slaked lime composition according to claim 1 , presenting in addition a particle size d 50 less than or equal to 8 μm.

6. The powdery slaked lime composition according to claim 1 , characterised in that the said composition has a BET specific surface obtained by the adsorption of nitrogen greater than or equal to 30 m 2 /g.

7. The powdery slaked lime composition according to claim 1 , characterised in that the said composition has a BET specific surface obtained by the adsorption of nitrogen less than or equal to 55 m 2 /g.

8. The powdery slaked lime composition according to claim 1 , characterised in that the said composition has a total BJH pore volume made up of pores having a diameter less than 1000 Å, obtained by nitrogen desorption, greater than or equal to 0.17 cm 3 /g.

9. The powdery slaked lime composition according to claim 1 , characterised in that the said composition has a total BJH pore volume made up of pores having a diameter less than 1000 Å, obtained by nitrogen desorption, less than or equal to 0.30 cm 3 /g.

10. The powdery slaked lime composition according to claim 1 , characterised in that the said compound has a BJH pore volume made up of pores having a diameter between 100 and 300 Å, obtained by nitrogen desorption, greater than or equal to 0.07 cm 3 /g and less than 0.15 cm 3 /g.

11. Composition of industrial sorbent including at least the said powdery slaked lime composition according to claim 1 .

Assignees

• Lhoist Rech Et Developpement Sa

Inventors

• Lorgouilloux Marion

Classifications

• B01D53/83

  with moving reactants · CPC title

• B01D53/40

  Acidic components (B01D53/44 takes precedence) · CPC title

• C04B2/04

  Slaking {(simultaneous dehydrating of gypsum and slaking of lime C04B11/022)} · CPC title

• B01D2253/304

  Linear dimensions, e.g. particle shape, diameter · CPC title

• B01D2257/2047

  Hydrofluoric acid · CPC title