FR2277037A1 - Alumina prodn. by thermal decompsn. of aluminium chloride soln. - using hot combustion gas, with recycling of hydrochloric acid - Google Patents

Alumina prodn. by thermal decompsn. of aluminium chloride soln. - using hot combustion gas, with recycling of hydrochloric acid

Info

Publication number
FR2277037A1
FR2277037A1 FR7520525A FR7520525A FR2277037A1 FR 2277037 A1 FR2277037 A1 FR 2277037A1 FR 7520525 A FR7520525 A FR 7520525A FR 7520525 A FR7520525 A FR 7520525A FR 2277037 A1 FR2277037 A1 FR 2277037A1
Authority
FR
France
Prior art keywords
soln
pref
prodn
hcl
alcl3
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.)
Granted
Application number
FR7520525A
Other languages
French (fr)
Other versions
FR2277037B1 (en
Inventor
Hans Jedlicka
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.)
Ruthner Industrieanlagen AG
Original Assignee
Ruthner Industrieanlagen 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 Ruthner Industrieanlagen AG filed Critical Ruthner Industrieanlagen AG
Publication of FR2277037A1 publication Critical patent/FR2277037A1/en
Application granted granted Critical
Publication of FR2277037B1 publication Critical patent/FR2277037B1/fr
Granted 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
    • C01F7/48—Halides, with or without other cations besides aluminium
    • C01F7/56—Chlorides
    • 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
    • C01F7/30—Preparation of aluminium oxide or hydroxide by thermal decomposition or by hydrolysis or oxidation of aluminium compounds
    • C01F7/306—Thermal decomposition of hydrated chlorides, e.g. of aluminium trichloride hexahydrate
    • 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
    • C01F7/42—Preparation of aluminium oxide or hydroxide from metallic aluminium, e.g. by oxidation
    • C01F7/428—Preparation of aluminium oxide or hydroxide from metallic aluminium, e.g. by oxidation by oxidation in an aqueous solution

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • ing And Chemical Polishing (AREA)
  • Treating Waste Gases (AREA)

Abstract

is mfd. by thermal decompsn. of an AlCl3 soln. and use of the formed for the prodn. of the AlCl3 soln. by (a) using an AlCl3 soln. prepd. by treating Al foil with a purity of >=99.9, pref. 99.99% Al with regenerated HCl; (b) pref. first contacting with furnace waste gas and then contacting the soln. directly with a gas at 700-1300, pref. 750-950 degrees C, contg. =0.01 wt.% S, in the form of S cpds., obtd. by combustion of gaseous fuel, to evaporate and effect pyrohydrolytic decompsn. of the soln. to a gas phase contg. HCl and Al2O3 in one stage; (c) sepg. the Al2O3, contg min. 99.5 pref. 99.8% Al2O3, from the gas phase above its dew point; (d) absorbing the HCl from the gas phase, pref. adiabatically in water with an electrical conductivity of max. 10, pref. 2 uS/cm or a soln. of max. 5% AlCl3 and max. 5% HCl in this water; and (e) recycling the regenerated HCl to (a). The process allows prodn. of highly pure Al2O3 from solns. obtd. by etching Al foil, e.g. in the prodn. of electric condensers.
FR7520525A 1974-07-01 1975-06-30 Alumina prodn. by thermal decompsn. of aluminium chloride soln. - using hot combustion gas, with recycling of hydrochloric acid Granted FR2277037A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT541374A AT335974B (en) 1974-07-01 1974-07-01 PROCESS FOR MANUFACTURING EXTREMELY PURE ALUMINUM OXIDE

Publications (2)

Publication Number Publication Date
FR2277037A1 true FR2277037A1 (en) 1976-01-30
FR2277037B1 FR2277037B1 (en) 1981-09-18

Family

ID=3575529

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7520525A Granted FR2277037A1 (en) 1974-07-01 1975-06-30 Alumina prodn. by thermal decompsn. of aluminium chloride soln. - using hot combustion gas, with recycling of hydrochloric acid

Country Status (3)

Country Link
AT (1) AT335974B (en)
DE (1) DE2525929C3 (en)
FR (1) FR2277037A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015176166A1 (en) * 2014-05-21 2015-11-26 Orbite Technologies Inc. Processes for decomposing aluminum chloride into alumina
WO2016049777A1 (en) * 2014-10-03 2016-04-07 Orbite Technologies Inc. Methods for purifying aluminum ions

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016134455A1 (en) * 2015-02-23 2016-09-01 Polar Sapphire Ltd. Process for making high-purity aluminum oxide

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015176166A1 (en) * 2014-05-21 2015-11-26 Orbite Technologies Inc. Processes for decomposing aluminum chloride into alumina
WO2016049777A1 (en) * 2014-10-03 2016-04-07 Orbite Technologies Inc. Methods for purifying aluminum ions

Also Published As

Publication number Publication date
ATA541374A (en) 1976-08-15
DE2525929C3 (en) 1978-04-06
AT335974B (en) 1977-04-12
DE2525929A1 (en) 1976-01-15
FR2277037B1 (en) 1981-09-18
DE2525929B2 (en) 1977-08-04

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Legal Events

Date Code Title Description
ST Notification of lapse