GB381520A - Improvements in the preparation of alumina - Google Patents

Improvements in the preparation of alumina

Info

Publication number
GB381520A
GB381520A GB15601/32A GB1560132A GB381520A GB 381520 A GB381520 A GB 381520A GB 15601/32 A GB15601/32 A GB 15601/32A GB 1560132 A GB1560132 A GB 1560132A GB 381520 A GB381520 A GB 381520A
Authority
GB
United Kingdom
Prior art keywords
excess
alkali carbonate
solution
lime
alumina
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
GB15601/32A
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 GB381520A publication Critical patent/GB381520A/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
    • C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
    • C01F7/12—Alkali metal aluminates from alkaline-earth metal aluminates

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

In the extraction of alkaline-earth aluminates with preferably hot alkali carbonate solutions with subsequent precipitation of alumina, excess alkali carbonate is used and the solution obtained, preferably after separating the residue, is treated with calcium oxide or hydroxide to remove silica. The quantity of lime added must be in excess of that corresponding to the excess of alkali carbonate present by an amount equal to at least 12 and preferably 25-30 times the amount of the dissolved silicic acid. Also the amount of excess lime must not be less than 6 nor appreciably greater than 17,5 kg. CaO per cubic metre of solution. If desired the lime may be added prior to extraction either to the alkaline-earth aluminate or to the alkali carbonate solution. In treating solutions low in silicic acid, precipitation is improved by raising the content of dissolved silica to 0,35 kg. SiO2 per cubic metre, as by addition of sodium silicate. Alumina may be precipitated from the purified solution by carbonic acid. Tabulated examples illustrating the working of the process are given. Specification 232,930, [Class 1 (iii), Oxides &c., Metallic], is referred to.
GB15601/32A 1931-11-23 1932-06-02 Improvements in the preparation of alumina Expired GB381520A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE381520X 1931-11-23

Publications (1)

Publication Number Publication Date
GB381520A true GB381520A (en) 1932-10-06

Family

ID=6353624

Family Applications (1)

Application Number Title Priority Date Filing Date
GB15601/32A Expired GB381520A (en) 1931-11-23 1932-06-02 Improvements in the preparation of alumina

Country Status (1)

Country Link
GB (1) GB381520A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2582378A (en) * 1947-09-17 1952-01-15 Aluminum Co Of America Process of producing gallium
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

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

Similar Documents

Publication Publication Date Title
GB637401A (en) Reducing reflection from glass surfaces
GB482326A (en) Improvements in or relating to the treatment of aluminous silicious material
US1618105A (en) Process of manufacturing aluminum hydroxide
GB381520A (en) Improvements in the preparation of alumina
GB404028A (en) Improvements in or relating to a method of producing sodium aluminate solutions
GB400984A (en) Improvements in or relating to a method of producing sodium aluminate solutions
GB1044196A (en) Extraction of alumina from bauxite
US1918361A (en) Method of manufacturing silicates with base exchanging properties, or so-called artificial zeolites
FR2021781A1 (en) Filler for bituminous compositions prepared from - the residue from the purification of bauxite
GB618895A (en) Clarification of coal washery effluent
US2118353A (en) Process for obtaining magnesium oxide from dolomitic rock
GB277697A (en) Improvements in the manufacture of alumina
US1978823A (en) Process for the preparation of alumina poor in silicic acid from alkaline earth aluminates
US1757373A (en) Method of improving glauconite
GB465644A (en) Process for the production of alumina practically free from silicic acid from alkaline earth aluminates
SU3985A1 (en) The method of separation of alumina hydrate from aluminate solutions
DE530027C (en) Manufacture of silica gel
GB637578A (en) Methods for extracting alumina from raw anhydrous calcium aluminates
US1492578A (en) Opaquing composition for enameling mixtures and process of making same
GB548930A (en) Method of processing dolomite
US1527903A (en) Manufacture of aluminum hydroxide
GB610988A (en) Water softening
SU132206A1 (en) Method for producing alumina from high-silicon bauxite
DE966382C (en) Process for the production of aluminate solutions from anhydrous calcium aluminates
AT113430B (en) Process for the extraction of pure clay and alkali carbonates or caustic alkalis.