Black pigment, process for its preparation and its use

Details Black pigment, process for its preparation and its use Black pigment, process for its preparation and its use

C - Chemistry, Metallurgy

01

G

6/210, 23/264

C01G 45/02 (2006.01) C01G 49/00 (2006.01) C01G 49/02 (2006.01) C04B 14/30 (2006.01) C04B 14/36 (2006.01) C09C 1/22 (2006.01) C09C 1/24 (2006.01)

Patent

CA 2004750

Building materials such as concrete can be colored by a black pigment which consists essentially of manganese ferrite of the composition Mn1+xFe2-xO4 with a spinel structure wherein x has a numerical value from -0.1 to 0.1 and the pigment is prepared by a process wherein a) soluble manganese (II) salts and soluble iron(II) salts are precipitated from a solution of metal salts by reaction with alkaline precipitating agents in an approximately stoichiometric ratio, b) the precipitate from a) is reacted with an oxidizing agent to form a pigment, and c) the pigment is filtered, washed, dried and ground.

Les matériaux de construction comme le béton peuvent être colorés à l'aide d'un pigment noir qui est constitué essentiellement de ferrite de manganèse de composition suivante : Mn1+xFe2-xO4, avec une structure de spinelle où x a une valeur numérique comprise entre -0,1 et 0,1; le pigment est préparé par un procédé dans lequel a) des sels de manganèse (II) solubles et des sels de fer (II) solubles sont précipités à partir d'une solution de sels métalliques par réaction avec des agents de précipitation alcalins dans un rapport approximativement stoechiométrique, b) le précipité provenant de l'étape a) est mis en réaction avec un agent oxydant pour former un pigment, et c) le pigment est filtré, lavé, séché et moulu.

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