CN100532268C - Production method of oxygen-containing beta aluminum fluoride for aluminum electrolysis bath by using aluminum scruff ash - Google Patents
Production method of oxygen-containing beta aluminum fluoride for aluminum electrolysis bath by using aluminum scruff ash Download PDFInfo
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- CN100532268C CN100532268C CNB2007101796761A CN200710179676A CN100532268C CN 100532268 C CN100532268 C CN 100532268C CN B2007101796761 A CNB2007101796761 A CN B2007101796761A CN 200710179676 A CN200710179676 A CN 200710179676A CN 100532268 C CN100532268 C CN 100532268C
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- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 94
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 94
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims description 6
- 239000001301 oxygen Substances 0.000 title claims description 6
- 229910052760 oxygen Inorganic materials 0.000 title claims description 6
- 238000005868 electrolysis reaction Methods 0.000 title abstract description 9
- IRPGOXJVTQTAAN-UHFFFAOYSA-N 2,2,3,3,3-pentafluoropropanal Chemical compound FC(F)(F)C(F)(F)C=O IRPGOXJVTQTAAN-UHFFFAOYSA-N 0.000 title 1
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminum fluoride Inorganic materials F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 title 1
- 238000000034 method Methods 0.000 claims abstract description 30
- 230000018044 dehydration Effects 0.000 claims abstract description 14
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 14
- 239000000203 mixture Substances 0.000 claims abstract description 13
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 12
- 230000007062 hydrolysis Effects 0.000 claims abstract description 10
- 238000006460 hydrolysis reaction Methods 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 239000011780 sodium chloride Substances 0.000 claims abstract description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000007654 immersion Methods 0.000 claims abstract description 3
- 239000004411 aluminium Substances 0.000 claims description 36
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 21
- 229910052731 fluorine Inorganic materials 0.000 claims description 21
- 239000011737 fluorine Substances 0.000 claims description 21
- 239000000243 solution Substances 0.000 claims description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 3
- 229910021529 ammonia Inorganic materials 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 239000003546 flue gas Substances 0.000 claims description 3
- 229910017604 nitric acid Inorganic materials 0.000 claims description 3
- 239000000618 nitrogen fertilizer Substances 0.000 claims description 3
- 239000011259 mixed solution Substances 0.000 claims description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 abstract 5
- 235000011941 Tilia x europaea Nutrition 0.000 abstract 5
- 239000004571 lime Substances 0.000 abstract 5
- 150000002222 fluorine compounds Chemical group 0.000 abstract 3
- 229910000873 Beta-alumina solid electrolyte Inorganic materials 0.000 abstract 2
- 229910021502 aluminium hydroxide Inorganic materials 0.000 abstract 2
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 abstract 2
- 238000001914 filtration Methods 0.000 abstract 2
- 229910001679 gibbsite Inorganic materials 0.000 abstract 2
- 230000004913 activation Effects 0.000 abstract 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 abstract 1
- 238000004140 cleaning Methods 0.000 abstract 1
- 238000002425 crystallisation Methods 0.000 abstract 1
- 230000008025 crystallization Effects 0.000 abstract 1
- 239000003792 electrolyte Substances 0.000 abstract 1
- 239000002440 industrial waste Substances 0.000 abstract 1
- 238000002360 preparation method Methods 0.000 abstract 1
- 239000002956 ash Substances 0.000 description 51
- 229910017083 AlN Inorganic materials 0.000 description 6
- PIGFYZPCRLYGLF-UHFFFAOYSA-N Aluminum nitride Chemical compound [Al]#N PIGFYZPCRLYGLF-UHFFFAOYSA-N 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- 235000002918 Fraxinus excelsior Nutrition 0.000 description 3
- 238000001354 calcination Methods 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- 229910016569 AlF 3 Inorganic materials 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- -1 compounds aluminium nitride Chemical class 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 125000001153 fluoro group Chemical group F* 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Abstract
The invention relates to a method utilizing the primary aluminum lime to produce the fluoride-bearing Beta alumina used on the aluminum electrolytic bath. The invention is characterized in that the process is to add the primary aluminum lime into the water with a weight of 1 to 3 times of the aluminum lime for immersion cleaning, filtering and dehydration; vapor the solution after the filtering and dehydration to obtain the mixture crystallization of the NaCl, the KCl and the NaF; add the dehydrated aluminum lime into the dilute hydrochloric acid solution for sufficient mixing; stir the solution for 3 to 5 hours at a temperature of 80 to 100 DEG C to generate the NH3 and the Al(OH)3; calcine the Al(OH)3 generated after the hydrolysis to prepare the fluoride-bearing Beta alumina. The invention has the advantages that the produced fluoride-bearing alumina has higher activation and can dissolve in the electrolyte very well and be used for electrolysis production; not only the environment pollution generated by the aluminum lime during the preparation of the primary aluminum can be solved, but also the industrial waste can be transformed to the resource for full utilization.
Description
Technical field
The present invention relates to a kind of method of producing aluminum electrolyzing cell used fluorine-containing βYang Hualv with the useless ash of primary aluminum.
Technical background
The aluminium ash is slag and the outer skin from virgin aluminium ingot, various aluminium alloy and aluminium section bar production process, and along with the electrolytic aluminum industrial expansion, the quantum of output of aluminium ash increases sharply, and only electrolysis primary aluminum production process will produce some ten thousand tons of aluminium ashes every year.The aluminium ash is because of the production process difference in its source, and the composition difference has increased greatly and handled the difficulty that reclaims.Therefore be difficult to find method in common to handle the aluminium ash of all kinds, a large amount of for a long time aluminium ashes have caused huge pollution to environment.The aluminium ash that the primary aluminum production process is produced is compared with the aluminium ash that other aluminium alloy and aluminium section bar production process produce, its maximum characteristics are that content of fluoride is obviously higher, environmental pollution is more serious, but aluminium alloy is relative simple with the aluminium ash component that aluminium section bar produces relatively, do not introduce alloying constituent, as compositions such as magnesium, zinc, calcium.
The treatment process of aluminium ash mainly is chemical method and physics method both at home and abroad at present, these methods all do not have specifically in conjunction with the source of aluminium ash and the component characteristics of different sources aluminium ash, therefore processing condition are difficult to hold in treating processes, and are all unstable through component and the performance of handling the product that obtains.Therefore look into and newly obtain these methods of handling the aluminium scrap ashes and seldom apply, therefore remain to meagrely-populated place discharging or landfill on the spot through the main processing mode of the ash of the aluminium scrap behind the extracting metals through investigation, still serious to the pollution of environment.
Summary of the invention
The deficiency that purpose of the present invention exists at above-mentioned prior art in just, provide a kind of pollution problem that can efficiently solve the aluminium ash that produces when producing primary aluminum, the method for utilizing the aluminium scrap ash to produce aluminum electrolyzing cell used fluorine-containing βYang Hualv that the aluminium ash is got utilization to environment.
Purpose of the present invention can be achieved through the following technical solutions.
A kind of method of utilizing the aluminium scrap ash to produce aluminum electrolyzing cell used fluorine-containing βYang Hualv is characterized in that its product process comprises the following steps:
(1) add the useless grey weight 1-3 times water of primary aluminum at the useless ash of primary aluminum, immersion stirs;
(2) will be through the moisture the useless grey filter dehydration of the primary aluminum behind the water logging bubble gives up ash to primary aluminum in less than 8%;
(3) filter dehydration is obtained solution and evaporate, obtain the crystalline mixture of NaCl, KCl and NaF;
(4) to add the useless grey weight of primary aluminum be thorough mixing in the 2-3 dilute hydrochloric acid solution doubly to the useless ash of the primary aluminum after will dewatering, and mixed solution is PH=5-6,, under 80-100 ℃ of temperature, stirs 3-5 hour reaction generation NH with mixed slip heating
3And Al (OH)
3, collect the ammonia that produces and be used for nitrogen fertilizer production;
(5) with the Al (OH) that produces after the hydrolysis
3Under 800-1200 ℃ of condition, calcined 1-2 hour, make fluorine-containing βYang Hualv.
A kind of method of utilizing the aluminium scrap ash to produce aluminum electrolyzing cell used fluorine-containing βYang Hualv of the present invention, after it is characterized in that in its product process the primary aluminum lye change washed processing, to make moisture in the ash less than 3% through processed, primary aluminum after the dehydration is useless grey under 900-1300 ℃ of temperature, under oxygen or air atmosphere, calcined 2-3 hour, and obtained fluorine-containing βYang Hualv.
Of the present invention a kind of method of utilizing the aluminium scrap ash to produce aluminum electrolyzing cell used fluorine-containing βYang Hualv when the aluminium ash after it is characterized in that dewatering is calcined under oxygen or air atmosphere, is collected the incinerating flue gas and is used to produce nitric acid.
Method of the present invention is the component characteristics of the aluminium scrap ash that produces when producing primary aluminum according to electrolysis of aluminum enterprise, in conjunction with aluminum electrolysis process, utilizes the useless ash of primary aluminum to produce the fluorine-containing βYang Hualv that can be used for electrolytic aluminum.The fluoro-containing alumina activity that this method is produced is higher, and the solvability in ionogen is very good, can satisfy electrolysis production.
Embodiment
A kind of method of producing aluminum electrolyzing cell used fluorine-containing βYang Hualv with the useless ash of primary aluminum has step and comprises:
(1) the primary aluminum lye change is washed processing: useless ash of primary aluminum and the ratio thorough mixing of water in 1:1-3 are stirred, the solvend in the useless ash of primary aluminum is fully dissolved.
(2) filter dehydration: make moisture in the useless ash of primary aluminum less than 8% through processed, the aqueous solution of gained carries out the mixture that evaporation process can obtain NaCl, KCl and NaF, and this mixture can be used for producing refining agent or deslagging agent.
(3) hydrolysis treatment: the useless ash of the primary aluminum after will dewatering is pressed the 1:2-3 thorough mixing with the PH=5-6 dilute hydrochloric acid solution, mixed slip is heated to 80-100 ℃ in encloses container, under agitation condition, kept 3-5 hour, make the abundant hydrolysis of unstable compounds aluminium nitride in the ash, the ammonia recovery that produces be can be used for producing nitrogenous fertilizer.The chemical equation of hydrolysis of aluminium nitride is: AlN+3H
2O=NH
3+ Al (OH)
3
(4) calcination processing: the useless ash of the primary aluminum after the hydrolysis was calcined 1-2 hour under 800-1300 ℃ of condition, can be obtained fluorine-containing βYang Hualv.
Or:
(1) the primary aluminum lye change is washed processing: useless ash of primary aluminum and the ratio thorough mixing of water in 1:1-3 are stirred, the solvend in the ash is fully dissolved.
(2) filter dehydration: make moisture in the useless ash of primary aluminum less than 3% through processed, the aqueous solution of gained carries out the mixture that evaporation process can obtain NaCl, KCl and NaF, and this mixture can be used for producing refining agent or deslagging agent.
(3) calcination processing: the ash after will dewatering is at 900-1200 ℃, with calcining under the condition that oxygen or air fully contact 2-3 hour, can obtain fluorine-containing βYang Hualv, and the incinerating flue gas can be used for producing nitric acid.The equation of aluminium nitride reaction is: AlN+O
2=Al
2O
3+ NO
2
The aluminium ash that produces during the Aluminum Electrolysis Production primary aluminum is remaining aluminium scrap ash behind extracting metals, and its main component is as follows: Al
2O
3: 30%-50%, AlN:20%-40%, NaCl:5%-15%, KCl:5%-10%, NaF:2%-8%, AlF
3: 1%-4%, Na
3AlF
6: 1%-8%, SiO
2: 0-2%, CaO:0-1%, MgO:0-1%, Fe
2O
3: 0-1%.
Embodiment 1
(1) casting pure electrolysis aluminium ingot aluminium scrap ash with 50Kg mixes stirring the solvend in the ash is fully dissolved with 150Kg water.
(2) to obtain 42.5kg moisture less than 8% wet ash for filter dehydration, and the aqueous solution obtains the mixture of 10.4KgNaCl, KCl, NaF through evaporation process.
(3) ash after will washing joins in the dilute hydrochloric acid solution of 90KgPH=6, stirs hydrolysis 4 hours under 90 ℃ of conditions of constant temperature in encloses container.Dehydration obtains water-content after the hydrolysis less than 3% grey 44.6Kg.
(4) ash after the hydrolysis being put into High Temperature Furnaces Heating Apparatus calcines under 1200 ℃ of conditions and obtained the fluorine-containing βYang Hualv of about 36Kg in 100 minutes.
The fluorine-containing βYang Hualv composition that makes is as follows: Al2O3:94.48%, SiO2:1.15%, NaO:3.14%, Fe2O3:0.62%, igloss: 0.51%.
Embodiment 2
(1) casting pure electrolysis aluminium ingot aluminium scrap ash with 50Kg mixes stirring the solvend in the ash is fully dissolved with 150Kg water.
(2) to obtain 41kg moisture less than 3% wet ash for filter dehydration, and the aqueous solution obtains the mixture of 10.3KgNaCl, KCl, NaF through evaporation process.
(3) ash that will wash after the dehydration is put into High Temperature Furnaces Heating Apparatus and is spread out, 1200 ℃ of conditions, feeds under the competent air, calcines and obtained the fluorine-containing βYang Hualv of about 36Kg in 120 minutes.
The fluorine-containing βYang Hualv composition that makes is as follows: Al203:94.25%, SiO2:1.35%, NaO:3.20%, Fe2O3:0.52%, igloss: 0.64%.
Claims (3)
1. a method of utilizing the aluminium scrap ash to produce aluminum electrolyzing cell used fluorine-containing βYang Hualv is characterized in that its product process comprises the following steps:
(1) add the useless grey weight 1-3 times water of primary aluminum at the useless ash of primary aluminum, immersion stirs;
(2) will be through the moisture the useless grey filter dehydration of the primary aluminum behind the water logging bubble gives up ash to primary aluminum in less than 8%;
(3) filter dehydration is obtained solution and evaporate, obtain the crystalline mixture of NaCl, KCl and NaF;
(4) the useless ash of the primary aluminum after will dewatering is incorporated as thorough mixing in the useless grey weight 2-3 of the primary aluminum dilute hydrochloric acid solution doubly, and mixed solution is PH=5-6,, under 80-100 ℃ of temperature, stirs 3-5 hour reaction generation NH with mixed slip heating
3And Al (OH)
3, collect the ammonia that produces and be used for nitrogen fertilizer production;
(5) with the Al (OH) that produces after the hydrolysis
3Under 800-1200 ℃ of condition, calcined 1-2 hour, make fluorine-containing βYang Hualv.
2. a kind of method of utilizing the aluminium scrap ash to produce aluminum electrolyzing cell used fluorine-containing βYang Hualv according to claim 1, after it is characterized in that in its product process the primary aluminum lye change washed processing, to make moisture in the useless ash of primary aluminum less than 3% through processed, primary aluminum after the dehydration is useless grey under 900-1300 ℃ of temperature, under oxygen or air atmosphere, calcined 2-3 hour, and obtained fluorine-containing βYang Hualv.
3. a kind of method of utilizing the aluminium scrap ash to produce aluminum electrolyzing cell used fluorine-containing βYang Hualv according to claim 2 when the useless ash of the primary aluminum after it is characterized in that dewatering is calcined under oxygen or air atmosphere, is collected the incinerating flue gas and is used to produce nitric acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101796761A CN100532268C (en) | 2007-12-17 | 2007-12-17 | Production method of oxygen-containing beta aluminum fluoride for aluminum electrolysis bath by using aluminum scruff ash |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101796761A CN100532268C (en) | 2007-12-17 | 2007-12-17 | Production method of oxygen-containing beta aluminum fluoride for aluminum electrolysis bath by using aluminum scruff ash |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101177292A CN101177292A (en) | 2008-05-14 |
| CN100532268C true CN100532268C (en) | 2009-08-26 |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101307388B (en) * | 2008-06-24 | 2011-04-13 | 中国铝业股份有限公司 | Process for extracting aluminium and chlorides in aluminium ash |
| CN101823741B (en) * | 2010-02-03 | 2012-08-15 | 中南大学 | Method for continuously producing aluminium electrolysis raw materials high-fluorine alumina, cryolite and sodium silicate with aluminum dust |
| CN102828028A (en) * | 2011-06-18 | 2012-12-19 | 于斌 | Comprehensive treatment technology of waste aluminum ash |
| CN103060566A (en) * | 2011-10-21 | 2013-04-24 | 湖南创元铝业有限公司 | Method for recovering aluminum oxide, chlorine salt and villiaumite from aluminum ash |
| CN103555955B (en) * | 2013-11-13 | 2015-04-22 | 昆明冶金研究院 | Resource utilization method of aluminum ash |
| CN105271327B (en) * | 2014-09-26 | 2017-04-05 | 昆明冶金研究院 | A kind of aluminum ash harmless treatment the method for recycling |
| CN104498726B (en) * | 2015-01-06 | 2016-11-30 | 云南云铝润鑫铝业有限公司 | A kind of slagging agent with aluminum ash as raw material and preparation method thereof |
| CN104988313A (en) * | 2015-03-12 | 2015-10-21 | 王宇栋 | Method for separating fluorine, chlorine and nitrogen compounds in aluminum ash through vacuum metallurgy method |
| CN105018739A (en) * | 2015-07-31 | 2015-11-04 | 昆明理工大学 | Efficient and comprehensive aluminium ash recycling method |
| CN105692664A (en) * | 2016-02-04 | 2016-06-22 | 曹志成 | Method for harmless treatment of aluminum slag ash |
| CN108239704B (en) * | 2018-01-23 | 2019-04-12 | 环境保护部华南环境科学研究所 | A kind of method of Quadratic aluminum dust recycling production aluminium oxide |
| CN113999078A (en) * | 2021-12-07 | 2022-02-01 | 马鞍山市绿科环保科技有限公司 | Method for preparing nitrogen fertilizer by using cast solid waste |
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| CN1049008A (en) * | 1990-08-18 | 1991-02-06 | 双城市龙江磨料磨具厂 | The production method of palm fibre corundum |
| CN1673084A (en) * | 2004-12-03 | 2005-09-28 | 潘坤涛 | Process of producing alumina with waste aluminium ash |
| CN1817795A (en) * | 2006-01-24 | 2006-08-16 | 杜梅生 | Production of aluminium hydrate from aluminium ash |
-
2007
- 2007-12-17 CN CNB2007101796761A patent/CN100532268C/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1049008A (en) * | 1990-08-18 | 1991-02-06 | 双城市龙江磨料磨具厂 | The production method of palm fibre corundum |
| CN1673084A (en) * | 2004-12-03 | 2005-09-28 | 潘坤涛 | Process of producing alumina with waste aluminium ash |
| CN1817795A (en) * | 2006-01-24 | 2006-08-16 | 杜梅生 | Production of aluminium hydrate from aluminium ash |
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| CN101177292A (en) | 2008-05-14 |
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