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 acidInfo
- 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
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.
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)
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)
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 |
-
1974
- 1974-07-01 AT AT541374A patent/AT335974B/en not_active IP Right Cessation
-
1975
- 1975-06-11 DE DE2525929A patent/DE2525929C3/en not_active Expired
- 1975-06-30 FR FR7520525A patent/FR2277037A1/en active Granted
Cited By (2)
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 |
---|---|
FR2277037B1 (en) | 1981-09-18 |
DE2525929B2 (en) | 1977-08-04 |
DE2525929C3 (en) | 1978-04-06 |
DE2525929A1 (en) | 1976-01-15 |
AT335974B (en) | 1977-04-12 |
ATA541374A (en) | 1976-08-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |