Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Patent
1993-02-23
1995-05-02
Nakarani, D. S.
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Particulate matter
423632, 423633, 423634, C01G 4902
Patent
active
054118018
ABSTRACT:
Disclosed herein are a process for producing poreless plate-like magnetite particles which have as large a plate ratio (average particle diameter/thickness) as possible and which are discrete each other, the process comprising the step of: obtained by oxidizing a suspension containing FeCO.sub.3 obtained by reacting an aqueous ferrous salt solution and an aqueous alkali carbonate solution by passing an oxygen-containing gas therethrough, wherein the suspension is obtained by reacting a ferrous salt solution containing 0.2 to 5.0 mol % of a ferric salt, calculated as Fe(III), based on Fe(II) and an aqueous alkali carbonate the amount of which is so controlled that the equivalent ratio of an alkali carbonate to the Fe(II) and Fe(III) in the aqueous ferrous salt solution is not less than 1 and the following general formula is satisfied: ##EQU1## and if necessary, 0.01 to 8.0 ml % of a water-soluble organic compound having a --COONa or --COOK group based on the Fe(II) and Fe(III) are added to any of the aqueous ferrous salt solution, the aqueous alkali carbonate solution and the suspension containing FeCO.sub.3 before the oxidation, and poreless plate-like magnetite particle which has as large a plate ratio and are discrete each other.
REFERENCES:
patent: 4024232 (1977-05-01), Garberi et al.
patent: 4382822 (1983-05-01), Mayer
patent: 4404254 (1983-09-01), Franz et al.
patent: 4865834 (1989-09-01), Tanihara et al.
Patent Abstracts of Japan, vol. 13, No. 457 (C-644) (3805), Oct. 16, 1989 and JP-A-1 176 233 (Toda Kogyo).
Nakarani D. S.
Toda Kogyo Corp.
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