CN101759211B - New method for producing alumina by using industrial Bayer process - Google Patents
New method for producing alumina by using industrial Bayer process Download PDFInfo
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- CN101759211B CN101759211B CN2010100302037A CN201010030203A CN101759211B CN 101759211 B CN101759211 B CN 101759211B CN 2010100302037 A CN2010100302037 A CN 2010100302037A CN 201010030203 A CN201010030203 A CN 201010030203A CN 101759211 B CN101759211 B CN 101759211B
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- Prior art keywords
- bauxite
- bayer process
- concentrate selection
- ore
- raw ore
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Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 43
- 238000004131 Bayer process Methods 0.000 title claims abstract description 38
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 239000012141 concentrate Substances 0.000 claims abstract description 64
- 229910001570 bauxite Inorganic materials 0.000 claims description 111
- 238000000034 method Methods 0.000 claims description 26
- 238000005188 flotation Methods 0.000 claims description 13
- 239000007787 solid Substances 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 6
- 230000008901 benefit Effects 0.000 abstract description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052782 aluminium Inorganic materials 0.000 abstract description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 2
- 239000001569 carbon dioxide Substances 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 abstract description 2
- 230000002349 favourable effect Effects 0.000 abstract 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 5
- 235000011941 Tilia x europaea Nutrition 0.000 description 5
- 239000004571 lime Substances 0.000 description 5
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 239000000920 calcium hydroxide Substances 0.000 description 3
- 235000011116 calcium hydroxide Nutrition 0.000 description 3
- 239000012065 filter cake Substances 0.000 description 3
- 238000000227 grinding Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 235000011121 sodium hydroxide Nutrition 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000004380 ashing Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
Abstract
The invention belongs to the technology field of alumina production, in particular a new method for producing alumina by using an industrial Bayer process. Alumyte concentrate and alumyte ore are mixed to enter a system for producing alumina by using the Bayer process. The invention adopting a mode of mixing the alumyte concentrate and the alumyte ore not only can utilize the alumyte ore with lower A/S to take the effects of changing waste into valuable and greatly prolonging the production insurance service life of domestic aluminum resources, but also can save energy and decrease the production cost, thereby acquiring favorable economic and social benefits and making contributions for establishing the harmonious society, developing the environmental-protection and low-carbon economy and reducing the carbon dioxide emission in China.
Description
Technical field
The invention belongs to technical field of alumina production, be specifically related to a kind of new method for producing production by using industrial Bayer process.
Background technology
Bauxite is the raw material that aluminum oxide industry is produced, got into since 21 century, and China's aluminium industry high speed development, China has become aluminum oxide the biggest in the world and Aluminum Electrolysis Production state at present, and China's metallurgical-grade aluminum oxide output accounted for 1/4 of whole world amount in 2007.The high aluminum ore of A/S＞10 mainly is used as the raw material of producing refractory materials; The higher-grade bauxite of A/S >=8 is mainly as the raw material of alumina producing Bayer process, and the abundant ore source of still present A/S >=8 is approach exhaustion, and the raw ore price is very high, and the cost of aluminum oxide is higher; And the bauxite of A/S＜8 though especially the middle-low bauxite resource of A/S＜6 is abundant, because economic uneconomical unsuitable alumina producing Bayer process technology can improve A/S through ore dressing, finally adopts alumina producing Bayer process; The bauxite of A/S＜5 can be produced aluminum oxide with sintering process, but the energy consumption of sintering process does not meet the policy of national energy-saving and emission-reduction up to 3 times of Bayer process.
For the bauxite that makes A/S＜8 can be applied to Bayer process production, can carry out flotation to the bauxite of A/S＜8, the concentrate selection of A/S >=8 after the flotation can directly get into the Bayer process production system.But adopt concentrate selection directly to get into the Bayer process production system and exist the higher shortcoming of energy consumption; This is because the moisture content in the present concentrate selection after ceramic filter filters is higher than 16%; The energy consumption that this must cause evaporization process in the Bayer process production system has increased production cost.
Summary of the invention
The object of the present invention is to provide a kind of new method for producing production by using industrial Bayer process, this method cost is lower, and productivity effect is good.
The present invention adopts following technical scheme:
New method for producing production by using industrial Bayer process, bauxite concentrate selection and bauxite raw ore are mixed and get into Bayer process alumina producing system.
The solid content that said bauxite concentrate selection and bauxite raw ore are mixed is 240-255g/l.
The A/S of said bauxite concentrate selection is 7.5-10, and the A/S of said bauxite raw ore is 5.0-6.0.
Said bauxite concentrate selection butt accounts for the 60-70% of bauxite concentrate selection butt and bauxite raw ore butt gross weight.
Said bauxite concentrate selection butt accounts for 2/3 of bauxite concentrate selection butt and bauxite raw ore butt gross weight.
Said bauxite concentrate selection is formed through the gradient floatation method flotation less than 7 bauxite by A/S.
Said bauxite concentrate selection is that the bauxite of 3.0-5.0 forms through full-automatic plate-and-frame filter press filtering and removing moisture after the gradient floatation method flotation again by A/S.
Said bauxite concentrate selection after full-automatic plate-and-frame filter press removes moisture directly gets into and mixes the ore deposit groove, in the groove of mixed ore deposit with the bauxite raw ore back entering Bayer process alumina producing system that is mixed.
The mode that the present invention adopts bauxite concentrate selection and bauxite raw ore to be mixed gets into production system has following advantage:
1, reduces the contained higher influence of moisture in the bauxite concentrate selection to producing; Calculate with butt, the moisture after the bauxite raw ore of the bauxite concentrate selection of 60-70% and 30-40% is mixed is about 10%, reduces by 4% moisture than independent use bauxite concentrate selection; Reduced energy consumption; Especially reduce the energy expenditure of postorder evaporization process in the Bayer process production, coal consumption can reduce by 18.92%, and emission amount of carbon dioxide is significantly reduced; Create condition for production production capacity, benefit reach maximization, given full play to the advantage that Bayer process is produced;
2, in the Bayer process production system, Al
2O
3Solubility rate relevant with many factors; The for example grade of raw material and fineness, caustic soda concentration, temperature, time etc.; The technician when groping to find finally to adopt bauxite concentrate selection and bauxite raw ore to be mixed, adopts present Bayer process production used caustic soda concentration, temperature, chronergy more satisfactory through secular; Final technician jumps out intrinsic thinking analysis, adjusts the solid content that bauxite concentrate selection and bauxite raw ore are mixed, and the solid content that the long research of process back discovery bauxite concentrate selection and bauxite raw ore are mixed is to Al
2O
3Solubility rate considerable influence is arranged, when the solid content of selecting bauxite concentrate selection and bauxite raw ore to be mixed is 240-255g/l, Al
2O
3Solubility rate can remain on 78-86%, the result is very good;
3, the gradient floatation method that the present invention adopted is the gradient floatation method of patent 200510032326.3; Flotation selects for use full-automatic plate-and-frame filter press that concentrate is carried out filtering and removing moisture after finishing; Have advantages such as filter cake moisture is low, treatment capacity big, be difficult for stopping up, easy to maintenance; Bauxite concentrate selection after full-automatic plate-and-frame filter press dehydration directly gets into and mixes the ore deposit groove, simplifies flow process; Compare with the ceramic filter that tradition is used; The moisture of filter cake is reduced to below 14% by original 16%; Make concentrate to get into to mix the ore deposit groove, be higher than 16% directly to get into the Bayer process production system improper, also need pass through to get into the Bayer process production system after airing etc. is handled and obtain filter cake moisture through ceramic filter; The process trouble, and also there are shortcomings such as being prone to obstruction, investment height, maintenance cost height in ceramic filter;
When 4, adopting the bauxite raw ore to get into the Bayer process production system separately, employed lime and ore one grinding machine of going forward side by side is handled.When adopting bauxite concentrate selection to get into the Bayer process production system separately, employed lime needs to become milk of lime through the lime slaking machine ashing and could use.The present invention adds the amount of lime that concentrate need use when utilizing the raw ore grinding machine to add lime when adopting bauxite concentrate selection and bauxite raw ore to be mixed again, and does not use milk of lime, can avoid the influence of large quantity of moisture to producing in the milk of lime like this;
5, can reduce that remaining organic accumulation is prone to cause negative impacts such as decomposition, sedimentation foaming in the bauxite concentrate selection; Being mixed in the bauxite concentrate selection, remaining organic influence degree descends behind the bauxite raw ore; It is little to produce fluctuation, can keep stable, the stable and high yields of producing;
6, the bauxite concentrate selection price of comparing with the bauxite raw ore of same alumina silica ratio is lower; Therefore the mode that adopts bauxite concentrate selection and bauxite raw ore to be mixed can reduce the price of raw material greatly; The bauxite concentrate selection ratio alumyte raw ore per ton cost of identical alumina silica ratio is cheap more than 100 yuan; The present invention finally can make alumina production cost reduce more than 7.7%, and economic benefit is obvious, increases Enterprises'Competitiveness;
The mode that the present invention adopts bauxite concentrate selection and bauxite raw ore to be mixed can be utilized the lower bauxite raw ore of A/S; Play the effect of turning waste into wealth; Increase China's bauxite resource production greatly and ensure the time limit, can save energy and reduce the cost and reduce production costs again, thereby obtain good economical, societal benefits; For building a Harmonious Society, develop pollution-free industry and low-carbon economy, reduce Chinese CO2 emissions and contribute.
Embodiment
Embodiment 1
New method for producing production by using industrial Bayer process; The gradient floatation method that adopts patent 200510032326.3 is that 3.0 bauxite carries out flotation to A/S; Flotation is after full-automatic filter filtering and removing moisture becomes the A/S that contains moisture 14% is 7.5 bauxite concentrate selection, and the A/S after full-automatic filter is filtered is that 7.5 bauxite concentrate selection is directly sent into and mixed the ore deposit groove; In the groove of mixed ore deposit, adding A/S is 6.0 bauxite raw ores; The bauxite concentrate selection butt accounts for 60% of bauxite concentrate selection butt and bauxite raw ore butt gross weight; Bauxite raw ore butt accounts for 40% of bauxite concentrate selection butt and bauxite raw ore butt gross weight; Solid content after adjustment bauxite concentrate selection and bauxite raw ore are mixed is 255g/l, gets into Bayer process alumina producing system then.
Embodiment 2
New method for producing production by using industrial Bayer process; The gradient floatation method that adopts patent 200510032326.3 is that 4.0 bauxite carries out flotation to A/S; Flotation is after full-automatic filter filtering and removing moisture becomes the A/S that contains moisture 13.5% is 9 bauxite concentrate selection, and the A/S after full-automatic filter is filtered is that 9 bauxite concentrate selection is directly sent into and mixed the ore deposit groove; In the groove of mixed ore deposit, adding A/S is 5.5 bauxite raw ores; The bauxite concentrate selection butt accounts for 2/3 of bauxite concentrate selection butt and bauxite raw ore butt gross weight; Bauxite raw ore butt accounts for 1/3 of bauxite concentrate selection butt and bauxite raw ore butt gross weight; Solid content after adjustment bauxite concentrate selection and bauxite raw ore are mixed is 245g/l, gets into Bayer process alumina producing system then.
Embodiment 3
New method for producing production by using industrial Bayer process; Adopting direct-flotation desiliconisation method is that 5.0 bauxite carries out ore dressing to A/S; Ore dressing is after full-automatic filter filtering and removing moisture becomes the A/S that contains moisture 13.5% is 10 bauxite concentrate selection, and the A/S after full-automatic filter is filtered is that 10 bauxite concentrate selection is directly sent into and mixed the ore deposit groove; In the groove of mixed ore deposit, adding A/S is 5.0 bauxite raw ores; The bauxite concentrate selection butt accounts for 70% of bauxite concentrate selection butt and bauxite raw ore butt gross weight; Bauxite raw ore butt accounts for 30% of bauxite concentrate selection butt and bauxite raw ore butt gross weight; Solid content after adjustment bauxite concentrate selection and bauxite raw ore are mixed is 240g/l, gets into Bayer process alumina producing system then.
Bauxite concentrate selection of the present invention can adopt gradient floatation method of the present invention to carry out ore dressing, also can adopt the ore dressing of direct flotation method, and other beneficiation method can realize equally.
Claims (5)
1. producing production by using industrial Bayer process method; It is characterized in that: bauxite concentrate selection and bauxite raw ore are mixed and get into Bayer process alumina producing system; The A/S of said bauxite concentrate selection is 7.5-10; The A/S of said bauxite raw ore is 5.0-6.0, and the solid content that said bauxite concentrate selection and bauxite raw ore are mixed is 240-255g/L, and said bauxite concentrate selection butt accounts for the 60-70% of bauxite concentrate selection butt and bauxite raw ore butt gross weight.
2. producing production by using industrial Bayer process method as claimed in claim 1 is characterized in that: said bauxite concentrate selection butt accounts for 2/3 of bauxite concentrate selection butt and bauxite raw ore butt gross weight.
3. according to claim 1 or claim 2 producing production by using industrial Bayer process method is characterized in that: said bauxite concentrate selection is formed through the gradient floatation method flotation less than 7 bauxite by A/S.
4. producing production by using industrial Bayer process method as claimed in claim 3 is characterized in that: said bauxite concentrate selection is that the bauxite of 3.0-5.0 forms through full-automatic plate-and-frame filter press filtering and removing moisture after the gradient floatation method flotation again by A/S.
5. producing production by using industrial Bayer process method as claimed in claim 4; It is characterized in that: said bauxite concentrate selection after full-automatic plate-and-frame filter press removes moisture directly gets into and mixes the ore deposit groove, in the groove of mixed ore deposit with the bauxite raw ore back entering Bayer process alumina producing system that is mixed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010100302037A CN101759211B (en) | 2010-01-19 | 2010-01-19 | New method for producing alumina by using industrial Bayer process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010100302037A CN101759211B (en) | 2010-01-19 | 2010-01-19 | New method for producing alumina by using industrial Bayer process |
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| Publication Number | Publication Date |
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| CN101759211A CN101759211A (en) | 2010-06-30 |
| CN101759211B true CN101759211B (en) | 2012-02-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010100302037A Expired - Fee Related CN101759211B (en) | 2010-01-19 | 2010-01-19 | New method for producing alumina by using industrial Bayer process |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4530819A (en) * | 1980-08-26 | 1985-07-23 | Tatabanvai Szenbanyak | Process for reducing the iron |
| CN101121538A (en) * | 2007-07-12 | 2008-02-13 | 中国铝业股份有限公司 | Desiliconizing method for bauxite by dry method |
-
2010
- 2010-01-19 CN CN2010100302037A patent/CN101759211B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4530819A (en) * | 1980-08-26 | 1985-07-23 | Tatabanvai Szenbanyak | Process for reducing the iron |
| CN101121538A (en) * | 2007-07-12 | 2008-02-13 | 中国铝业股份有限公司 | Desiliconizing method for bauxite by dry method |
Non-Patent Citations (1)
| Title |
|---|
| 杨波等.常压下高浓度NaOH 浸取铝土矿预脱硅.《过程工程学报》.2007,第7卷(第5期),922-927. * |
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| CN101759211A (en) | 2010-06-30 |
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Granted publication date: 20120208 |