CN1295354C - Device for dissolving out aluminium oxide - Google Patents
Device for dissolving out aluminium oxide Download PDFInfo
- Publication number
- CN1295354C CN1295354C CNB2005102006200A CN200510200620A CN1295354C CN 1295354 C CN1295354 C CN 1295354C CN B2005102006200 A CNB2005102006200 A CN B2005102006200A CN 200510200620 A CN200510200620 A CN 200510200620A CN 1295354 C CN1295354 C CN 1295354C
- Authority
- CN
- China
- Prior art keywords
- pressure
- flasher
- autoclave
- temperature
- dissolving
- 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 - Fee Related
Links
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 claims abstract description 11
- 238000004090 dissolution Methods 0.000 claims description 8
- 239000012530 fluid Substances 0.000 claims description 5
- 239000003513 alkali Substances 0.000 claims description 4
- 239000003085 diluting agent Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000012452 mother liquor Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 18
- 238000002386 leaching Methods 0.000 abstract 3
- 241001417501 Lobotidae Species 0.000 description 25
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 206010039509 Scab Diseases 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007701 flash-distillation Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000035807 sensation Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
- 150000004684 trihydrates Chemical class 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/02—Apparatus therefor
-
- 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
- C01F7/06—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom by treating aluminous minerals or waste-like raw materials with alkali hydroxide, e.g. leaching of bauxite according to the Bayer process
- C01F7/062—Digestion
- C01F7/064—Apparatus for digestion, e.g. digestor vessels or heat exchangers
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B21/00—Obtaining aluminium
- C22B21/0015—Obtaining aluminium by wet processes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Metallurgy (AREA)
- Mechanical Engineering (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Nutrition Science (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Paper (AREA)
Abstract
The present invention discloses a novel device for leaching out alumina, which comprises a high-pressure diaphragm pump, a casing pipe preheater, a pulse buffer, an autoclave with a pipe bundle, an autoclave and a flash evaporator, wherein the devices are orderly connected through pipes according to the technical process of leaching. The device of the present invention enhances the alumina production scale of 450 kt/a of each group of the existing leaching devices to be more than 500 kt/a, so that the productivity and the economic benefit can be enhanced.
Description
Technical field:
The present invention relates to alumina producing equipment and technology, particularly relate to the dissolving device and the technology of alumina producing.
Background technology:
Closely during the last ten years, China's aluminum oxide industry has been obtained rapid progress aspect equipment enlarging, and at present for bayer's process alumina producing system, the highest production capacity of production series can reach 400～450kt/a aluminum oxide, has improved more than 5 times than the eighties.The maximization of equipment increases substantially China's alumina producer production capacity and technical equipment, and economic benefit is obviously improved.
Equipment enlarging is the trend of domestic and international aluminum oxide industry development, and it can improve alumina producer production capacity, automated arm level and labour productivity, improves technico-economical comparison, reduces consumption.External employing bauxite trihydrate is the newly-built bayer's process alumina producer of raw material, and a production capacity of producing series can reach 700～900kt/a aluminum oxide.
In recent years, domestic alumina producer was produced one of former bayer's process on the basis of serial 300kt/a production capacity by a large amount of technological transformations, under the situation that main equipment does not increase, progressively production capacity was brought up to 400 present～450kt/a.If will further improve very difficulty of output, must more large-scale equipment and the device of exploitation.
Stripping is the core process in the aluminum oxide production process.Present domestic alumina producer bayer's process production system, the maximum dissolving device production capacity of using is organized as 450kt/a.The raw pulp amount that one group of dissolving device passes through is 460～470m
3/ h, surplus two groups of annual product aluminum oxide 90 of dissolving device ten thousand tons.
Can alumina producer further develop to the maximization direction, and can key further maximize at dissolving device.
The present invention studies dissolving device in conjunction with the development trend of present alumina producing situation and aluminum oxide industry, has proposed a kind of new large-scale dissolving device and auxiliary plan, and the raw pulp amount that this dissolving device can pass through is 520～550m
3/ h can bring up to the aluminum oxide production capacity more than the 500kt/a.
Summary of the invention:
The objective of the invention is to: propose a kind of new large-scale dissolving device and technology, the dissolving device that existing aluminum oxide production capacity is 450kt/a is brought up to 500kt/a, realize the further maximization of dissolving device.
The present invention is achieved in that it comprises following equipment:
1. high-pressure diaphragm pump: select 2 of GEHO pumps for use, flow Q=480～550m
3/ h, P=6.0～7.0MPa;
2. cannula primary heater: adopt six grades of sleeve preheatings, the inner sleeve specification is: D325 * 13～14mm, and the outer tube specification is: D402 * 9～10mm;
3. pulse buffer: 2, pressure is respectively 5.2MPa and 7.0MPa, specification of equipment: φ 2.6 * 10m;
4. be with the heating tube bundle autoclave: 15～16, design pressure 5.2MPa, autoclave specification: φ 3 * 18m;
5. autoclave: 4～5, design pressure 5.2MPa, autoclave specification: φ 3 * 18m;
6. flasher: totally 12,
Nt112, Nt111 flasher specification: φ 3.5 * 9.7m, pressure 3.2MPa;
Nt110, Nt109 flasher specification: φ 3.5 * 9.7m, pressure 2.8MPa.；
Nt108 flasher specification: φ 3.5 * 9.7m, pressure 2.4MPa;
Nt107 flasher specification: φ 4.5 * 9.7m, pressure 2.0MPa;
Nt106 flasher specification: φ 4.5 * 9.7m, pressure 1.6MPa;
Nt105 flasher specification: φ 4.5 * 9.7m, pressure 1.3MPa;
Nt104 flasher specification: φ 4.5 * 9.7m, pressure 1.0MPa;
Nt103 flasher specification: φ 5.5 * 9.7m, pressure 0.8MPa;
Nt102, Nt101 flasher specification: φ 5.5 * 9.7m, pressure 0.6MPa;
Above equipment connects by the dissolving-out process flow sequence successively with pipeline.
The technology the key technical indexes of novel dissolving device is circulating mother liquor: Na
2O
K230～250g/l, R
P0.53～0.60; Raw pulp temperature: 85～96 ℃; Stripping temperature: 255～262 ℃; Dissolution time: 30～60min; Digesting efficiency of alumina: 〉=93%; Dissolution fluid R
P: 1.15～1.20; Exsolution red mud alkali ratio: 0.28～0.40; Final stage self-evaporatint n. temperature: 127～135 ℃; Dissolving device operation factor: 〉=93%; The diluent stripping pit residence time: 3.5～4.5h.
According to the technical indicator of present bayer's process alumina producer, when dissolving device raw pulp throughput is 470m
3During/h, the aluminum oxide production capacity can reach 450kt/a.If dissolving device raw pulp throughput is 525m
3/ h, then the aluminum oxide production capacity can reach 500kt/a.
Novel dissolving device of the present invention can pass through 525～550m
3The raw pulp of/h, based on the following:
(1), high-pressure diaphragm pump: the high-pressure diaphragm pump that this operation of domestic alumina industry all adopts Dutch GEHO company to produce, its peak flow of triplex single action pump of the up-to-date release of existing the said firm can reach 550m
3/ h can satisfy this workshop section raw pulp traffic requirement fully.
(2), cannula primary heater: the first, the caliber D325 * 13mm of inner sleeve is when by 525～550m
3During/h raw pulp, its flow rate of pulp is 2.08～2.18m/s, according to the experience of the fluid mechanics principle and the industry, when raw pulp is in velocity in pipes is 2.0～2.5m/s scope, cannula primary heater both can reach best heat-transfer effect, was difficult for again generating in pipe scabbing.The second, heat transfer area, this cannula primary heater, total heat conduction area (calculating with footpath in the interior pipe) is 3174m
2, and the cannula primary heater total heat conduction area of former 450kt/a scale is 2595m
2, increase 22.3%, so heat transfer area enough satisfies the requirement of 500kt/a aluminum oxide scale.
(3), pulse buffer: volume gain 17.3%, can satisfy the requirement of 500kt/a alumina producing.
(4), autoclave: the first, this autoclave volume 100m
3/ platform, existing autoclave volume 83m
3/ platform, every volume gain 20.5%.The second, the autoclave heat transfer area of band heating tube, existing autoclave heat transfer area is 540m
2, this autoclave heat transfer area is 610m
2, increasing by 13.0%, autoclave volume and heat transfer area all can satisfy the requirement of 500kt/a alumina producing.
(6), flasher: this dissolving device is established 12 flashers altogether, the dissolving device of existing 450kt/a scale, its flasher specification is φ 3.0～5.0 * 9.7m, the flasher of this dissolving device is adjusted into φ 3.5～5.5 * 9.7m with it, each flasher sectional area increases by 21.0～36.1% respectively, can satisfy the requirement of 500kt/a alumina producing.
Check through each major equipment of novel dissolving device of the present invention is carried out production capacity, its aluminum oxide production capacity can satisfy the needs of 500kt/a fully.
During work, advance high-pressure diaphragm pump from raw material mill or the next raw pulp of atmospheric silicon removing operation, by high-pressure diaphragm pump raw pulp is delivered to first pulse buffer, advance 5～6 grades of cannula primary heaters then, raw pulp enters 4～5 grades of preheating autoclaves behind second pulse buffer, with about raw pulp preheating temperature to 200 ℃, advance again in the reaction pressure boiler and heat with live steam, temperature is brought up to the requirement of 255～262 ℃ of normal stripping temperature, be incubated about 30～60min of the stripping residence time subsequently, ore pulp advances the ore pulp flash-pot after the stripping, and through ten grades of flash distillation decrease temperature and pressure, temperature is reduced to 127～135 ℃ from 255～260 ℃, send dilution trap then, send the stripping pit after red mud wash liquor with the sedimentation workshop converges, the dilution slip stops about 4 hours to remove the silicon in the solution at the stripping pit, impurity such as iron are sent to the sedimentation workshop then.
The invention has the beneficial effects as follows: will have every group of dissolving device 450kt/a alumina producing scale now and bring up to more than the 500kt/a, make China's aluminum oxide industry aspect equipment enlarging, step major step again forward, further improve China's aluminum oxide technical equipment.
Description of drawings:
Fig. 1 is a process flow diagram of the present invention.
Embodiment:
Embodiments of the invention: according to the aluminum oxide production capacity is that 500kt/a selects following equipment to carry out supporting:
1. high-pressure diaphragm pump: select 2 of GEHO pumps for use, flow Q=480～550m
3/ h, P=6.0～7.0MPa;
2. cannula primary heater: adopt six grades of sleeve preheatings, every grade of six roots of sensation, every casing length 90m, sleeve pipe total length 3240m; The inner sleeve specification is: D325 * 13～14mm, outer tube specification are: D402 * 9～10mm;
3. pulse buffer: 2, pressure is respectively 5.2MPa and 7.0MPa, specification of equipment: φ 2.6 * 10m, volume 42m
3
4. be with the heating tube bundle autoclave: 16, design pressure 5.2MPa, autoclave specification: φ 3 * 18m, volume 100m
3, heating-surface area 610m
2
5. autoclave: 5, design pressure 5.2MPa, autoclave specification: φ 3 * 18m, volume 100m
3
6. flasher: totally 12,
Nt112, Nt111 flasher specification: φ 3.5 * 9.7m, pressure 3.2MPa;
Nt110, Nt109 flasher specification: φ 3.5 * 9.7m, pressure 2.8MPa;
Nt108 flasher specification: φ 3.5 * 9.7m, pressure 2.4MPa;
Nt107 flasher specification: φ 4.5 * 9.7m, pressure 2.0MPa;
Nt106 flasher specification: φ 4.5 * 9.7m, pressure 1.6MPa;
Nt105 flasher specification: φ 4.5 * 9.7m, pressure 1.3MPa;
Nt104 flasher specification: φ 4.5 * 9.7m, pressure 1.0MPa;
Nt103 flasher specification: φ 5.5 * 9.7m, pressure 0.8MPa;
Nt102, Nt101 flasher specification: φ 5.5 * 9.7m, pressure 0.6MPa;
Above equipment connects according to the dissolving-out process flow sequence successively with pipeline, forms the entire flow of stripping operation.
The technology the key technical indexes of new dissolving device is circulating mother liquor: Na
2O
K235～245g/l, R
P0.53～0.55; Raw pulp temperature: 90 ℃; Stripping temperature: 258～262 ℃; Dissolution time: 40min; Digesting efficiency of alumina: 93%～95%; Dissolution fluid R
P: 1.18～1.20; Exsolution red mud alkali ratio: 0.28～0.38;
Final stage self-evaporatint n. temperature: 130～132 ℃; Dissolving device operation factor: 93%～96%; The diluent stripping pit residence time: 4h.
Claims (3)
1. device for dissolving out aluminium oxide, it is characterized in that: it comprises following equipment:
1. high-pressure diaphragm pump: select 2 of GEHO pumps for use, flow Q=480～550m
3/ h, P=6.0～7.0MPa;
2. cannula primary heater: adopt six grades of sleeve preheatings, the inner sleeve specification is D325 * 13～14mm, and the outer tube specification is D402 * 9～10mm;
3. pulse buffer: 2, pressure is respectively 5.2MPa and 7.0MPa, specification of equipment φ 2.6 * 10m;
4. be with the heating tube bundle autoclave: 15～16, design pressure 5.2MPa, autoclave specification φ 3 * 18m;
5. autoclave: 4～5, design pressure 5.2MPa, autoclave specification φ 3 * 18m;
6. flasher: totally 12,
Nt112, Nt111 flasher specification: φ 3.5 * 9.7m, pressure 3.2MPa;
Nt110, Nt109 flasher specification: φ 3.5 * 9.7m, pressure 2.8MPa;
Nt108 flasher specification: φ 3.5 * 9.7m, pressure 2.4MPa;
Nt107 flasher specification: φ 4.5 * 9.7m, pressure 2.0MPa;
Nt106 flasher specification: φ 4.5 * 9.7m, pressure 1.6MPa;
Nt105 flasher specification: φ 4.5 * 9.7m, pressure 1.3MPa;
Nt104 flasher specification: φ 4.5 * 9.7m, pressure 1.0MPa;
Nt103 flasher specification: φ 5.5 * 9.7m, pressure 0.8MPa;
Nt102, Nt101 flasher specification: φ 5.5 * 9.7m, pressure 0.6MPa;
Above equipment connects by the dissolving-out process flow sequence successively with pipeline.
2. the technology of device for dissolving out aluminium oxide as claimed in claim 1, it is characterized in that: its key technical indexes is circulating mother liquor: Na
2O
K230～250g/l, R
P0.53～0.60; Raw pulp temperature: 85～96 ℃; Stripping temperature: 255～262 ℃; Dissolution time: 30～60min; Digesting efficiency of alumina: 〉=93%; Dissolution fluid R
P: 1.15～1.20; Exsolution red mud alkali ratio: 0.28～0.40; Final stage self-evaporatint n. temperature: 127～135 ℃; Dissolving device operation factor: 〉=93%; The diluent stripping pit residence time: 3.5～4.5h.
3. the technology of device for dissolving out aluminium oxide according to claim 2, it is characterized in that: its key technical indexes is circulating mother liquor: Na
2O
K235～245g/l, R
P0.53～0.55; Raw pulp temperature: 90 ℃; Stripping temperature: 258～262 ℃; Dissolution time: 40min; Digesting efficiency of alumina: 93%～95%; Dissolution fluid R
P: 1.18～1.20; Exsolution red mud alkali ratio: 0.28～0.38; Final stage self-evaporatint n. temperature: 130～132 ℃; Dissolving device operation factor: 93%～96%; The diluent stripping pit residence time: 4h.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005102006200A CN1295354C (en) | 2005-10-19 | 2005-10-19 | Device for dissolving out aluminium oxide |
| BRPI0617714-0B1A BRPI0617714B1 (en) | 2005-10-19 | 2006-10-13 | ALUMINUM DIGESTION APPLIANCE |
| PCT/CN2006/002701 WO2007045154A1 (en) | 2005-10-19 | 2006-10-13 | Alumina digesting apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005102006200A CN1295354C (en) | 2005-10-19 | 2005-10-19 | Device for dissolving out aluminium oxide |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1752231A CN1752231A (en) | 2006-03-29 |
| CN1295354C true CN1295354C (en) | 2007-01-17 |
Family
ID=36679236
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005102006200A Expired - Fee Related CN1295354C (en) | 2005-10-19 | 2005-10-19 | Device for dissolving out aluminium oxide |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN1295354C (en) |
| BR (1) | BRPI0617714B1 (en) |
| WO (1) | WO2007045154A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1295354C (en) * | 2005-10-19 | 2007-01-17 | 贵阳铝镁设计研究院 | Device for dissolving out aluminium oxide |
| CN101264912B (en) * | 2007-03-14 | 2011-05-04 | 贵阳铝镁设计研究院 | Heating and thermal insulation exsolution method for aluminum oxide high-pressure exsolution section |
| CN102531004B (en) * | 2010-12-21 | 2014-09-10 | 贵阳铝镁设计研究院有限公司 | Method and device for dissolving out diaspore under high pressure |
| CN102531011B (en) * | 2011-12-22 | 2013-11-06 | 东北大学设计研究院（有限公司） | Aluminum oxide dissolving device capable of realizing both high-temperature and low-temperature dissolving ways and method thereof |
| CN103101947B (en) * | 2013-03-11 | 2014-08-27 | 茌平信发华宇氧化铝有限公司 | Digesting process for aluminum oxide production process |
| CN109437265B (en) * | 2018-12-25 | 2021-03-23 | 中铝视拓智能科技有限公司 | Efficiency optimization method and efficiency optimization system for high-pressure dissolution flash system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2000832C (en) * | 1988-10-27 | 1993-05-11 | Gyorgy Banvolgyi | Process for producing alumina from gibbsitic bauxites |
| CN1528669A (en) * | 2003-09-26 | 2004-09-15 | 中国铝业股份有限公司 | Flash evaporator water injection method of digesting system for alumina high-pressure pan |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2033968C1 (en) * | 1992-07-21 | 1995-04-30 | Акционерное общество открытого типа "Уральский научно-исследовательский и проектный институт алюминиевой промышленности" | Unit for bauxite leaching |
| RU2117632C1 (en) * | 1996-08-07 | 1998-08-20 | Акционерное общество "Богословский алюминиевый завод" | Method of leaching boxite |
| FR2834979B1 (en) * | 2002-01-21 | 2004-02-20 | Pechiney Aluminium | SOLUBILIZATION OF CARBONATES BY RECYCLING CONDENSATES DURING THE PRESSURE ATTACK OF MONOHYDRATE BAUXITES |
| RU2256614C2 (en) * | 2003-10-16 | 2005-07-20 | Открытое акционерное общество "Сибирско-Уральская алюминиевая компания" | Bauxite leaching process |
| WO2005066378A1 (en) * | 2004-01-07 | 2005-07-21 | Grenvil Marquis Dunn | Exothermic pressure leach autoclave circuits |
| CN1295354C (en) * | 2005-10-19 | 2007-01-17 | 贵阳铝镁设计研究院 | Device for dissolving out aluminium oxide |
-
2005
- 2005-10-19 CN CNB2005102006200A patent/CN1295354C/en not_active Expired - Fee Related
-
2006
- 2006-10-13 BR BRPI0617714-0B1A patent/BRPI0617714B1/en not_active IP Right Cessation
- 2006-10-13 WO PCT/CN2006/002701 patent/WO2007045154A1/en not_active Ceased
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2000832C (en) * | 1988-10-27 | 1993-05-11 | Gyorgy Banvolgyi | Process for producing alumina from gibbsitic bauxites |
| CN1528669A (en) * | 2003-09-26 | 2004-09-15 | 中国铝业股份有限公司 | Flash evaporator water injection method of digesting system for alumina high-pressure pan |
Also Published As
| Publication number | Publication date |
|---|---|
| BRPI0617714A2 (en) | 2011-08-02 |
| WO2007045154A1 (en) | 2007-04-26 |
| CN1752231A (en) | 2006-03-29 |
| BRPI0617714B1 (en) | 2014-01-21 |
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