Alunite compound particle, process for producing the same...

Details Alunite compound particle, process for producing the same... Alunite compound particle, process for producing the same...

C - Chemistry, Metallurgy

01

F

C01F 7/00 (2006.01) C08K 3/30 (2006.01) C08L 101/00 (2006.01)

Patent

CA 2602974

Alunite compound particles of the general formula: Ma[Al1-xM~x]3(SO4 2- )y(OH)z~mH2O (I) (wherein M is at least one cation selected from the group consisting of Na+, K+, NH4 + and H3O+; M~ is at least one cation selected from the group consisting of Cu2+, Zn2+, Ni2+, Sn4+, Zr4+ and Ti4+; and a, m, x, y and z satisfy the relationships: 0.8<=a<=1.35, 0<=m<=5, 0<=x<=0.4, 1.7<=y<=2.5 and 4<=z<=7), wherein when D25 and D75 respectively refer to the particle diameters at 25% value and 75% value of cumulative particle size distribution curve measured according to laser diffractometry, D75/D25 satisfies specified value. These particles have small average particle diameters and are shaped like spheres, disks or hexagonal plates, and are further characterized by having extremely narrow particle diameter distribution.

Particules d'un composé de l'alunite de formule générale : Ma[Al1-xM~x]3(SO4 2-)y(OH)z~mH2O (I) (dans laquelle M est au moins un cation sélectionné dans le groupe constitué de Na+, K+, NH4 + et H3O+ ; M~ est au moins un cation sélectionné dans le groupe constitué de Cu2+, Zn2+, Ni2+, Sn4+, Zr4+ et Ti4+ ; et a, m, x, y et z satisfont aux relations : 0,8<=a<=1,35, 0<=m<=5, 0<=x<=0,4, 1,7<=y<=2,5 et 4<=z<=7) ayant un rapport D75/D25 satisfaisant à une valeur spécifiée, les valeurs de D25 et D75 faisant référence aux diamètres des particules à une valeur cumulée de 25 % et à une valeur cumulée de 75 %, respectivement, de la courbe de distribution de la taille des particules mesurée par diffractométrie laser. Ces particules ont de petits diamètres moyens des particules et ont une forme ressemblant à des sphères, des disques ou des lamelles hexagonales et sont en plus caractérisées en ce qu'elles ont une distribution extrêmement étroite du diamètre des particules.

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