GB799243A - Process for the production of alumina of high purity - Google Patents

Process for the production of alumina of high purity

Info

Publication number
GB799243A
GB799243A GB29746/55A GB2974655A GB799243A GB 799243 A GB799243 A GB 799243A GB 29746/55 A GB29746/55 A GB 29746/55A GB 2974655 A GB2974655 A GB 2974655A GB 799243 A GB799243 A GB 799243A
Authority
GB
United Kingdom
Prior art keywords
alumina
aluminium hydroxide
hydroxide
inoculant
stage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB29746/55A
Inventor
Friedrich Wilhelm Wrigge
Gerhard Lehnert
Hans Ginsberg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vereinigte Aluminium Werke AG
Original Assignee
Vereinigte Aluminium Werke AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vereinigte Aluminium Werke AG filed Critical Vereinigte Aluminium Werke AG
Priority to GB29746/55A priority Critical patent/GB799243A/en
Publication of GB799243A publication Critical patent/GB799243A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00—Compounds of aluminium
    • C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
    • C01F7/46—Purification of aluminium oxide, aluminium hydroxide or aluminates
    • C01F7/47—Purification of aluminium oxide, aluminium hydroxide or aluminates of aluminates, e.g. removal of compounds of Si, Fe, Ga or of organic compounds from Bayer process liquors
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00—Compounds of aluminium
    • C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
    • C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
    • C01F7/14—Aluminium oxide or hydroxide from alkali metal aluminates
    • C01F7/144—Aluminium oxide or hydroxide from alkali metal aluminates from aqueous aluminate solutions by precipitation due to cooling, e.g. as part of the Bayer process

Abstract

Pure aluminium hydroxide is obtained from sodium aluminate solutions containing suspended impurities such as iron, silicon and titanium oxides by precipitating a portion of aluminium hydroxide (which will contain the impurities), removing the precipitate, and precipitating the remainder of the aluminium as substantially pure hydroxide. The initial precipitation may be carried out by means of aluminium hydroxide as inoculant (the aluminium hydroxide being added or formed in situ with carbon dioxide) and inoculated mixture agitated or carbon dioxide added thereto, whereby 1-7 per cent of the alumina dissolved as aluminate may be precipitated. In the second stage, precipitation may be by inoculation and agitation or by the use of carbon dioxide. The impure aluminium hydroxide obtained in the first stage may be used as inoculant in the first stage of a further process. This procedure may be repeated until the efficiency decreases, and then the impure alumina is dissolved in sodium hydroxide and pure alumina recovered therefrom conventionally. An example is given in which the initial inoculant is equivalent to 20-25 per cent of the total precipitatable alumina.
GB29746/55A 1955-10-18 1955-10-18 Process for the production of alumina of high purity Expired GB799243A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB29746/55A GB799243A (en) 1955-10-18 1955-10-18 Process for the production of alumina of high purity

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB29746/55A GB799243A (en) 1955-10-18 1955-10-18 Process for the production of alumina of high purity

Publications (1)

Publication Number Publication Date
GB799243A true GB799243A (en) 1958-08-06

Family

ID=10296500

Family Applications (1)

Application Number Title Priority Date Filing Date
GB29746/55A Expired GB799243A (en) 1955-10-18 1955-10-18 Process for the production of alumina of high purity

Country Status (1)

Country Link
GB (1) GB799243A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3607140A (en) * 1968-11-19 1971-09-21 Aluminum Co Of America Preparation of alumina of improved purity by iron removal
US3832442A (en) * 1970-10-20 1974-08-27 Kaiser Aluminium Chem Corp Method for producing alumina hydrates
FR2591581A1 (en) * 1985-12-17 1987-06-19 Pechiney Aluminium PROCESS FOR THE PRODUCTION WITH HIGH PRODUCTIVITY OF ALUMINUM TRIHYDROXIDE, HIGH PURITY AND MEDIAN DIAMETER LESS THAN 4 MICROMETERS, RULES ON DEMAND

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3607140A (en) * 1968-11-19 1971-09-21 Aluminum Co Of America Preparation of alumina of improved purity by iron removal
US3832442A (en) * 1970-10-20 1974-08-27 Kaiser Aluminium Chem Corp Method for producing alumina hydrates
FR2591581A1 (en) * 1985-12-17 1987-06-19 Pechiney Aluminium PROCESS FOR THE PRODUCTION WITH HIGH PRODUCTIVITY OF ALUMINUM TRIHYDROXIDE, HIGH PURITY AND MEDIAN DIAMETER LESS THAN 4 MICROMETERS, RULES ON DEMAND
EP0231715A1 (en) * 1985-12-17 1987-08-12 Aluminium Pechiney High-output process, controlled as required, for the preparation of high purity aluminiumtrihydroxide having a mean diameter lower than 4 microns
US4732742A (en) * 1985-12-17 1988-03-22 Aluminum Pechiney Process for the production at a high level of productivity of aluminum trihydroxide in a high state of purity and with a median diameter of less than 4 micrometers, which is regulated as required

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