Synthetic rhombohedrol magnetite pigment

Details Synthetic rhombohedrol magnetite pigment Synthetic rhombohedrol magnetite pigment

C - Chemistry, Metallurgy

01

G

6/210, 23/270

C01G 49/08 (2006.01) C02F 9/00 (2006.01)

Patent

CA 1149582

ABSTRACT OF THE DISCLOSURE This specification discloses magnetite useful as black pigment and which is also capable of being calcined in the presence of oxygen into an alpha-ferric oxide red pigment. This magnetite is prepared from waste pickle liquor by the addition of carbonate, preferably in the form of limestone or soda ash. The magnetite is produced by a process comprising the steps of: A. contacting ferrous chloride solution having an Fe++ concentration of from about 0.9 to 2.4 moles per liter with a stoichiometric amount of carbonate ion; B. heating the mixture to a temperature of from about 70 - 90°C.; C. aerating the mixture to oxidize the iron to magnetite having a Fe++/ total Fe++ and Fe+++ ratio of from about 0.23- 0.38; and D. recovering the magnetite so produced, the improvement which comprises providing the carbonate in the form of finely divided particles of an average size of less than 3.5 microns. The process provides a novel synthetic rhombehodral magnetite having 60 degree angles, a relative tinting strength of greater than about 105, a BET surface area of greater than about 13 m2/g and an average particle size of less than about .08 microns as measured along the long axis.

344970

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