Production of precipitated red iron (III) oxide pigment relative

Details Production of precipitated red iron (III) oxide pigment relative Production of precipitated red iron (III) oxide pigment relative

1973-09-19

1976-03-23

Vertiz, Oscar R.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

106304, C01G 4902, C09D 500

Patent

active

039461033

ABSTRACT:
In the production of a precipitated red iron (III) oxide pigment of hematite structure wherein an aqueous iron (II) salt solution is mixed with an aqueous alkali solution in substantially equivalent quantities to produce an aqueous suspension of iron (II) hydroxide or carbonate, the suspension is oxidized by passing oxygen-containing gases through it with stirring under atmospheric pressure at a temperature of about 0.degree. to 50.degree.C, and the resulting iron (III) seed suspension is allowed to grow into precipitated red iron (III) oxide pigment by further oxidation with an oxygen-containing gas at a temperature of about 50.degree. to 100.degree.C in the presence of more iron (II) salt and alkali solution or in the presence of iron (II) salt and metallic iron at a pH-value kept in the acid range, the improvement which comprises producing the iron (III) seed suspension in the presence of a foreign modifying substance so that lattice-distorted, chemically reactive finely divided delta-FeOOH seeds are formed, whereby the resulting red iron (III) oxide pigment contains less than about 15 % by weight of .alpha.-FeOOH. The modifying substance may be a chloride of magnesium, calcium or aluminum, vanadium pentoxide, sodium phosphate, erythritol, mannitol, glyceric acid, K, Na-tartrate, Na-citrate, ribose, glucose, fructose, tannin, or NH.sub.4 --, Ca--, Al--, Fe or Mg-lignin sulfonate.

REFERENCES:
patent: 2558303 (1951-06-01), Marcot
patent: 2618532 (1952-11-01), Atkins et al.
patent: 2618571 (1952-11-01), Peel et al.
patent: 2620261 (1952-12-01), Toxby
patent: 2696426 (1954-12-01), Marcot
patent: 3009821 (1961-11-01), Bennetch
patent: 3382174 (1968-05-01), Hund
patent: 3627554 (1971-12-01), Bockman et al.
patent: 3755554 (1973-08-01), Lailach et al.

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