GB643849A - Process for making valuable products out of metallurgical slags - Google Patents

Process for making valuable products out of metallurgical slags

Info

Publication number
GB643849A
GB643849A GB32865/46A GB3286546A GB643849A GB 643849 A GB643849 A GB 643849A GB 32865/46 A GB32865/46 A GB 32865/46A GB 3286546 A GB3286546 A GB 3286546A GB 643849 A GB643849 A GB 643849A
Authority
GB
United Kingdom
Prior art keywords
per cent
slag
cao
al2o3
sio2
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
GB32865/46A
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 GB643849A publication Critical patent/GB643849A/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
    • C01F7/164—Calcium aluminates

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Manufacture Of Iron (AREA)

Abstract

Lime, and when necessary, alumina-bearing ores, e.g. bauxite, are added to a blast furnace charge, or to the molten slag issuing from the furnace, so that the slag, preferably after slow cooling, has a composition within the limits (a) x(SiO2.2CaO) + y(Al2O3.1 to 2 CaO) and (b) Al2O3=12-37 per cent, SiO2=12-28 per cent, CaO=49.5-62 per cent, the alumina being thereupon extracted. Preferably, the composition should also be in the zone bounded, in the CaO-SiO2-Al2O3 triangular diagram, by two lines which join the figurative point of dicalcium silicate with that of pentacalcium trialuminate on the one hand, and with that of a composition containing 39.8 per cent CaO and 60.2 per cent Al2O3 on the other. Iron oxides, fluorspar, alkali salts, magnesia, feldspar, &c. which reduce the fusion temperature, may be added to the slag. Sulphides, carbon, iron, &c. burning in or on the surface of the slag may also be added. The slag may be homogenized by injecting air or gas, by oscillating the furnace, or by agitation resulting from magnetic action in an electric furnace. The residue from the extraction of alumina is suitable for the manufacture of cements. The Specification as open to inspection under Sect. 91 discloses a CaO content of the slag of 48-70 per cent, and refers also to sulphur, aluminium and silicium (sic) as additions burning in or on the surface of the slag. This subject-matter does not appear in the Specification as accepted.ALSO:Lime, and when necessary, alumina-bearing ores; e.g. bauxite, are added to a blast furnace charge, so that the slag, preferably after slow cooling, has a composition within the limits (a) x(SiO2 2CaO)+y(Al2O3 1 to 2CaO), and (b) Al2O3=12-37 per cent, SiO2 =12-28 per cent, CaO=49.5-62 per cent, the alumina being thereupon extracted. Preferably, the composition should also be in the zone bounded, in the CaO-SiO2-Al2O3 triangular diagram, by two lines which join the figurator point of dicalcium silicate with that of pentacalcium trialuminate on the one hand, and with that of a composition containing 39.8 per cent CaO and 60.2 per cent Al2O3 on the other. The Specification as open to inspection under Sect. 91 discloses a CaO content of the slag of 48-70 per cent. This subject-matter does not appear in the Specification as accepted.
GB32865/46A 1945-11-05 1946-11-05 Process for making valuable products out of metallurgical slags Expired GB643849A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR643849X 1945-11-05

Publications (1)

Publication Number Publication Date
GB643849A true GB643849A (en) 1950-09-27

Family

ID=8999733

Family Applications (1)

Application Number Title Priority Date Filing Date
GB32865/46A Expired GB643849A (en) 1945-11-05 1946-11-05 Process for making valuable products out of metallurgical slags

Country Status (2)

Country Link
GB (1) GB643849A (en)
LU (1) LU28189A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4113833A (en) * 1976-07-02 1978-09-12 Nikolai Ivanovich Eremin Process for the production of alumina from the mineral component of solid fuels

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
HU179977B (en) * 1977-02-23 1983-01-28 Akad Gorniczo Hutnicza Process for preparing aluminium oxide

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4113833A (en) * 1976-07-02 1978-09-12 Nikolai Ivanovich Eremin Process for the production of alumina from the mineral component of solid fuels

Also Published As

Publication number Publication date
LU28189A1 (en)

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