Continuous production of iron oxide hydroxide

Details Continuous production of iron oxide hydroxide Continuous production of iron oxide hydroxide

C - Chemistry, Metallurgy

01

G

23/267

C01G 49/02 (2006.01) C01G 49/06 (2006.01)

Patent

CA 1079489

CONTINUOUS PRODUCTION OF IRON OXIDE HYDROXIDE Abstract of the Disclosure In the production of an FeOOH seed suspension, comprising contacting an iron(II) salt solution with a basic precipitant to form a basic iron(II) salt or hydroxide suspen- sion, oxidizing the salt or hydroxide, the precipitation and oxidation steps being carried out locally separate from one another and recovering a suspension of FeOOH, the improvement which comprises a) effecting the precipitation by mixing an about 1 to 20% by weight iron(II) salt solution with sufficient basic precipitant to precipitate about 25 to 95 atom % of the iron(II), b) at another location oxidizing 10 to 50% of the iron(II) precipitated in (a) over a period of from about 0.5 to 5 hours at a temperature in the range from about 20°C to 65°C, c) at another location oxidizing the suspension obtained in (b) with intensive mixing over a period of from about 0.01 to 1 hour to oxidize at least about 10% more iron until up to at most about 60% of the iron(II) precipitated in stage (a) is oxidized, and d) at another location substantially completely oxidizing the precipitated iron(II) still present over a period of from about 1 to 10 hours. Advantageously the temperature rises progressively from stage to stage. Immedia- tely prior to stage (c) the suspension may be ripened for at least 30 minutes and, immediately after stage (c) it may be ripened for 30 minutes to 5 hours.

267761

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