Compositions: coating or plastic – Materials or ingredients – Miscellaneous
Patent
1976-01-05
1978-12-12
Douglas, Winston A.
Compositions: coating or plastic
Materials or ingredients
Miscellaneous
423106, 423633, C09C 124
Patent
active
041294548
ABSTRACT:
An iron oxide based pigment in alpha-Fe.sub.2 O.sub.3 form, which contains the water insoluble part obtained by calcination of basic iron sulfate and/or jarosite based residues, this pigment being prepared by a process comprising calcining at a temperature from 600.degree. to 800.degree. C and during a period from 2 to 240 minutes basic iron sulfate and/or jarosite based residues, so as to decompose in an incomplete manner such basic iron sulfates and/or jarosite and to obtain in the calcined product an iron bonded sulfur content of more than 0.6%, and solubilizing the not decomposed iron sulfates with other soluble sulfated metals, such as zinc sulfate, by lixiviating the calcined product, these water-soluble compounds being then separated by appropriate processes.
REFERENCES:
patent: 1834960 (1931-12-01), Mitchell
patent: 2007233 (1935-07-01), Wespy
patent: 3341347 (1967-09-01), Lewis et al.
Chemical Abstracts, vol. 81, 1974, p. 178, entry 172438n.
Chemical Abstracts, vol. 75, 1971, p. 161, entry 23341Z.
Journal of Applied Chemistry and Biotechnology, vol. 22, 1972, "The Effect of Temperature on the Properties of Calcined Red Iron Oxide Pigments," pp. 1209-1215.
"Societe de Prayon"
Douglas Winston A.
Howard J. V.
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