GB640905A - Process for the manufacture of calcium aluminates - Google Patents

Process for the manufacture of calcium aluminates

Info

Publication number
GB640905A
GB640905A GB26046/46A GB2604646A GB640905A GB 640905 A GB640905 A GB 640905A GB 26046/46 A GB26046/46 A GB 26046/46A GB 2604646 A GB2604646 A GB 2604646A GB 640905 A GB640905 A GB 640905A
Authority
GB
United Kingdom
Prior art keywords
per mol
mols
cao per
aluminate
lime
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
GB26046/46A
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 GB640905A publication Critical patent/GB640905A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/32—Aluminous cements
    • 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
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
    • C04B7/44—Burning; Melting

Abstract

In the production of an impure calcium aluminate by heating a lime-yielding ore with an aluminate or silica-aluminate material such as bauxite, clay, kaolin, shale and coal ashes, the ingredients are proportioned to provide 1-3 mols. CaO per mol. Al2O3. 0-1 mol. CaO per mol. SiO2, 0-2 mols. CaO per mol. TiO2 and 0 mols. CaO per mol. Fe2O3, and the mixture heated under such conditions that lime-iron oxide combinations are not formed, the temperature being maintained below that at which clinkering occurs. Within the limits, the lime content increases with increase of silica content, and of reaction temperature and time. The reaction temperature may vary from below 1000 DEG C. up to 1350 DEG C., depending on the composition of the reaction mass. The heating may take place with a reducing agent present or in a reducing atmosphere, especially in the higher temperature range. The products may be used as calcareous cements either as such or after separation of the iron, or for the extraction of alumina. Residues from the latter operation may be reused as raw material.ALSO:In the production of an impure calcium aluminate by heating a lime-yielding ore with an aluminate or silico-aluminate material such as bauxite, clay, kaolin, shale and coal ashes, the ingredients are proportioned to provide 1-3 mols. CaO per mol. Al2O3, 0-1 mol. CaO per mol. SiO2, 0-2 mols. CaO per mol. TiO2 and 0 mols. CaO per mol. Fe2O3, and the mixture heated under such conditions that limeiron oxide combinations are not formed, the temperature being maintained below that at which clinkering occurs. Within the limits, the lime content increases with increase of silica content, and of reaction temperature and time. The reaction temperature may vary from below 1000 DEG C. up to 1350 DEG C. depending on the composition of the reaction mass. The heating may take place with a reducing agent present or in a reducing atmosphere, especially in the higher temperature range. The products may be used as calcareous cements either as such or after separation of the iron.
GB26046/46A 1944-03-24 1946-08-29 Process for the manufacture of calcium aluminates Expired GB640905A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR990667T 1944-03-24

Publications (1)

Publication Number Publication Date
GB640905A true GB640905A (en) 1950-08-02

Family

ID=9546039

Family Applications (1)

Application Number Title Priority Date Filing Date
GB26046/46A Expired GB640905A (en) 1944-03-24 1946-08-29 Process for the manufacture of calcium aluminates

Country Status (2)

Country Link
FR (2) FR990667A (en)
GB (1) GB640905A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4048285A (en) * 1974-04-04 1977-09-13 Chemokomplex Vegyipari Gep-Es Berendezes Export-Import Vallalat Process for the extraction of alumina from minerals, rocks and industrial by-products
CN116462519A (en) * 2023-04-18 2023-07-21 武汉科技大学 Corundum refractory material for hydrogen metallurgy and preparation method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4048285A (en) * 1974-04-04 1977-09-13 Chemokomplex Vegyipari Gep-Es Berendezes Export-Import Vallalat Process for the extraction of alumina from minerals, rocks and industrial by-products
CN116462519A (en) * 2023-04-18 2023-07-21 武汉科技大学 Corundum refractory material for hydrogen metallurgy and preparation method thereof

Also Published As

Publication number Publication date
FR990667A (en) 1951-09-25
FR55902E (en) 1952-09-09

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