GB423594A - Improvements in process for obtaining a mixture of alumina and an insoluble calcium salt and for obtaining alumina - Google Patents

Improvements in process for obtaining a mixture of alumina and an insoluble calcium salt and for obtaining alumina

Info

Publication number
GB423594A
GB423594A GB21547/33A GB2154733A GB423594A GB 423594 A GB423594 A GB 423594A GB 21547/33 A GB21547/33 A GB 21547/33A GB 2154733 A GB2154733 A GB 2154733A GB 423594 A GB423594 A GB 423594A
Authority
GB
United Kingdom
Prior art keywords
alumina
water
aluminate
carbon dioxide
calcium carbonate
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
GB21547/33A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB423594A publication Critical patent/GB423594A/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
    • C01F7/16—Preparation of alkaline-earth metal aluminates or magnesium aluminates; Aluminium oxide or hydroxide therefrom
    • C01F7/18—Aluminium oxide or hydroxide from alkaline earth metal aluminates

Abstract

Calcium aluminate is extracted with water, and alumina and an insoluble calcium salt are precipitated from the solution by a reagent such as carbon dioxide, phosphoric acid or fluoric acid. When carbon dioxide is used, calcium carbonate may be removed from the mixed precipitate either by dissolution in say dilute hydrochloric acid preferably after calcination at 500--600 DEG C., or by calcining the precipitate to convert the calcium carbonate to lime which is washed out by water, or by dissolution in water containing carbon dioxide. The bicarbonate solution obtained is subjected to heat or vacuum to remove carbon dioxide, or treated with lime. The process is preferably effected in a cyclic manner, the leaching water being continuously circulated. A leaching temperature of 25--35 DEG C. is specified. The aluminate solution obtained contains 0,2--3 grms. alumina per litre. The calcium aluminate may be produced from siliceous bauxite. Aluminate cements and clinkers may be leached. The calcium carbonate-alumina precipitate may be used for the manufacture of lacs, abrasive products or aluminium sulphate, or may be mixed with baryta for the production of barium aluminate. This product may be used in the purification of water.ALSO:Baryta is added to a precipitated admixture of calcium carbonate and alumina to form barium aluminate. This product is adapted for use in the purification of water.
GB21547/33A 1932-07-30 1933-07-31 Improvements in process for obtaining a mixture of alumina and an insoluble calcium salt and for obtaining alumina Expired GB423594A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE423594X 1932-07-30

Publications (1)

Publication Number Publication Date
GB423594A true GB423594A (en) 1935-01-31

Family

ID=3869410

Family Applications (1)

Application Number Title Priority Date Filing Date
GB21547/33A Expired GB423594A (en) 1932-07-30 1933-07-31 Improvements in process for obtaining a mixture of alumina and an insoluble calcium salt and for obtaining alumina

Country Status (1)

Country Link
GB (1) GB423594A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2582376A (en) * 1947-04-05 1952-01-15 Aluminum Co Of America Process of producing gallium
US2582378A (en) * 1947-09-17 1952-01-15 Aluminum Co Of America Process of producing gallium
US2582377A (en) * 1947-04-11 1952-01-15 Aluminum Co Of America Recovery of gallium from alkali metal aluminate solutions

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2582376A (en) * 1947-04-05 1952-01-15 Aluminum Co Of America Process of producing gallium
US2582377A (en) * 1947-04-11 1952-01-15 Aluminum Co Of America Recovery of gallium from alkali metal aluminate solutions
US2582378A (en) * 1947-09-17 1952-01-15 Aluminum Co Of America Process of producing gallium

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