BLACK PIGMENT, PROCESS FOR ITS PREPARATION AND ITS USE

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) sa...

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Bibliographische Detailangaben
Hauptverfasser:	BUXBAUM, GUNTER
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES ARTIFICIAL STONE CEMENTS CERAMICS CHEMISTRY COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F CONCRETE DYES INORGANIC CHEMISTRY LIME, MAGNESIA METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS PAINTS POLISHES PREPARATION OF CARBON BLACK REFRACTORIES SLAG TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS,TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES TREATMENT OF NATURAL STONE
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Beschreibung
Zusammenfassung:	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.