CN101289210A - Process for producing aluminum oxide from high-sulfur bauxite - Google Patents
Process for producing aluminum oxide from high-sulfur bauxite Download PDFInfo
- Publication number
- CN101289210A CN101289210A CNA2008101147879A CN200810114787A CN101289210A CN 101289210 A CN101289210 A CN 101289210A CN A2008101147879 A CNA2008101147879 A CN A2008101147879A CN 200810114787 A CN200810114787 A CN 200810114787A CN 101289210 A CN101289210 A CN 101289210A
- Authority
- CN
- China
- Prior art keywords
- bauxite
- alumina
- sulphur
- sulfur
- bayer process
- 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.)
- Pending
Links
- 229910001570 bauxite Inorganic materials 0.000 title claims abstract description 37
- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000011593 sulfur Substances 0.000 title claims abstract description 24
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 title description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 39
- 238000004519 manufacturing process Methods 0.000 claims abstract description 25
- 238000004131 Bayer process Methods 0.000 claims abstract description 24
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 22
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000003546 flue gas Substances 0.000 claims abstract description 16
- 238000001704 evaporation Methods 0.000 claims abstract description 11
- 239000005864 Sulphur Substances 0.000 claims description 34
- 230000008020 evaporation Effects 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 9
- 238000006477 desulfuration reaction Methods 0.000 claims description 8
- 230000023556 desulfurization Effects 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 238000002386 leaching Methods 0.000 claims description 4
- 239000000920 calcium hydroxide Substances 0.000 claims description 3
- 235000011116 calcium hydroxide Nutrition 0.000 claims description 3
- 238000004090 dissolution Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 229910052708 sodium Inorganic materials 0.000 claims description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 abstract description 6
- 235000011941 Tilia x europaea Nutrition 0.000 abstract description 6
- 239000004571 lime Substances 0.000 abstract description 6
- 150000003839 salts Chemical class 0.000 abstract description 4
- 238000001354 calcination Methods 0.000 abstract 3
- 230000002411 adverse Effects 0.000 abstract 1
- 239000010413 mother solution Substances 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 18
- 229910004298 SiO 2 Inorganic materials 0.000 description 5
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 229910052938 sodium sulfate Inorganic materials 0.000 description 5
- 235000011152 sodium sulphate Nutrition 0.000 description 5
- 239000002994 raw material Substances 0.000 description 3
- 239000003245 coal Substances 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 206010039509 Scab Diseases 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 159000000009 barium salts Chemical class 0.000 description 1
- NFMAZVUSKIJEIH-UHFFFAOYSA-N bis(sulfanylidene)iron Chemical compound S=[Fe]=S NFMAZVUSKIJEIH-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 229910001648 diaspore Inorganic materials 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003317 industrial substance Substances 0.000 description 1
- 239000012452 mother liquor Substances 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention provides a method for producing alumina by bauxite with high content of sulfur and relates to the method for producing the alumina by Bayer process. The method is characterized in that the bauxite is firstly pre-calcined at the temperature of 350 DEG C to 850 DEG C for 5min to 60min and then dissolved. The method of the invention eliminates the adverse impact of the sulfur in ore on alumina producing equipment and producing technique by the processes such as pre-calcining the bauxite with high content of the sulfur, absorbing sulfur-bearing flue gas by red mud through the Bayer process, evaporating mother solution and removing salt, causticization of removing salt residue by lime, and the like; in a factory which uses the Bayer process to produce the alumina, only adding an ore pre-calcining process can process the bauxite with high content of the sulfur by the Bayer process more economically. The pre-calcining of the ore also eliminates the influence of organics in the bauxite on the alumina producing process by the Bayer process.
Description
Technical field
A kind of high-sulfur bauxite production method of alumina of utilizing relates to a kind of Bayer process alumina-producing method.
Background technology
China's diaspore type high-sulfur bauxite reserves are at least more than 1.5 hundred million tons, and the sulphur in the ore is with pyrite (FeS
2) etc. form exist, the sulphur content in ore is called as high-sulfur bauxite greater than 0.7% usually.Adopt high-sulfur bauxite production alumina technology difficulty big, if directly handle with Bayer process, the sulphur major part in the ore is with S
2-Enter solution, in the Bayer process working cycle, be oxidized to SO gradually
4 2-, and accumulation gradually, aluminum oxide production process is produced greatly harm: one side S
2-Can strong corrosion equipment, the sulphur in the ore has not only increased the alumina producing alkaline consumption on the other hand, and produces in evaporative process and scab or blocking pipe, even makes evaporation operation be difficult to carry out.Thereby this class ore must just can be used for Bayer process production through after certain processing.Once proposed to comprise the several different methods that adds the barium salt solution desulfurization in ore dressing, the aluminum oxide production process both at home and abroad.Except that raw material coal desulphurization technology, other technologies are because higher, the troublesome poeration of cost fails to obtain aborning large-scale application so far.Raw material coal desulphurization technology is comparatively ripe, obtained widespread use aborning, but desulfuration efficiency is lower, and its application only limits to sintering process, and can not be used for handling high-sulfur bauxite.
Summary of the invention
Purpose of the present invention is exactly the deficiency that exists at above-mentioned prior art, provides a kind of and can effectively eliminate sulphur in the ore disadvantageous effect of alumina producing equipment and production technique utilized high-sulfur bauxite production method of alumina.
The objective of the invention is to be achieved through the following technical solutions.
A kind of high-sulfur bauxite production method of alumina of utilizing is characterized in that its production process is with the preroasting 5～60min under 350～850 ℃ of temperature of bauxite elder generation, and then carries out stripping that a part of sulphur enters the roasting flue gas, and a part of sulphur is with SO
4 2-Form enters dissolution fluid.
A kind of high-sulfur bauxite production method of alumina of utilizing of the present invention, what it is characterized in that described baking flue gas absorbs the processing desulfurization with Bayer process red mud.
A kind of high-sulfur bauxite production method of alumina of utilizing of the present invention is characterized in that described baking flue gas absorbs the processing desulfurization through milk of lime.
A kind of high-sulfur bauxite production method of alumina of utilizing of the present invention is characterized in that in the Bayer process process in leaching of the bauxite after the described roasting, with SO
4 2-Form enters the sulphur in the solution, at mother liquid evaporation to N
k230～250g/L, temperature is reduced to 40～60 ℃, Na in the solution
2SO
4Concentration be reduced to below the 10g/L.The salt slag of discharging can be handled by the causticization mode of routine; Also can be used as industrial chemicals after treatment, as paper making raw material.
Method of the present invention is that bauxite is first at 350～850 ℃ of preroasting 5～60min in production process, and the sulphur sub-fraction in this process in the ore is with SO
2Form enter flue gas, major part is trapped in the ore.The sulphur that enters in the flue gas can absorb with Bayer process red mud.After the preroasting, the sulphur major part in the ore in process in leaching with SO
4 2-Enter in solution and the red mud, thereby eliminated S
2-Harm.The sulphur that enters in the solution is discharged from mother liquor with carbon alkali when the mother liquid evaporation salt discharge.
Method of the present invention in Bayer process alumina producing operation, only need increase ore preroasting operation, and just the use Bayer process of energy less expensive is handled high-sulfur bauxite.Ore is carried out preroasting, also eliminated the influence of the organism in the bauxite to the Bayer process aluminum oxide production process, flow process rationally, simply, can realize by the simple technique transformation in the production, but processing sulphur content in less expensive ground has better economic, environmental benefit greater than 0.7% high-sulfur bauxite.
Description of drawings
The process flow sheet of Fig. 1 method of the present invention.
Embodiment
A kind of high-sulfur bauxite production method of alumina of utilizing, its production process are with the preroasting 5～60min under 350～850 ℃ of temperature of bauxite elder generation, and then carry out stripping, and a part of sulphur enters the roasting flue gas, and a part of sulphur is with SO
4 2-Form enters dissolution fluid.Absorbing with Bayer process red mud of baking flue gas handled desulfurization or absorbed the processing desulfurization through milk of lime.In the Bayer process process in leaching of the bauxite after the roasting, with SO
4 2-Form enters the sulphur in the solution, at mother liquid evaporation to N
k230～250g/L, temperature is reduced to 40～60 ℃, Na in the solution
2SO
4Concentration be reduced to below the 10g/L.
Embodiment 1
Bauxite Al
2O
3Content 58.66%, SiO
2Content is 14.14%, and S content is 1.18%, 580 ℃ of preroasting 30min.The lime addition is 7% during stripping, and at 270 ℃ of stripping 60min, exsolution red mud A/S is 1.10, and N/S is 0.50, and 13% sulphur of having an appointment this moment enters in the preroasting flue gas, and 50% sulphur enters Bayer process red mud, and about 37% sulphur is with SO
4 2-Enter solution, mother liquid evaporation is cooled to 60 ℃ of temperature to 230g/L, and sodium sulfate concentration is 9g/L in the solution.
Embodiment 2
Bauxite Al
2O
3Content 58.66%, SiO
2Content is 14.14%, and S content is 1.18%, 580 ℃ of preroasting 60min.The lime addition is 7%, and at 270 ℃ of stripping 60min, exsolution red mud A/S is 1.10, and N/S is 0.50, and 13% sulphur of having an appointment this moment enters in the preroasting flue gas, and about 50% sulphur enters Bayer process red mud, and about 37% sulphur is with SO
4 2-Enter solution, mother liquid evaporation is cooled to 40 ℃ of temperature to 240g/L, and sodium sulfate concentration is 5g/L in the solution.
Embodiment 3
Bauxite Al
2O
3Content 63.50%, SiO
2Content is 9.10%, and S content is 1.05%, 600 ℃ of preroasting 30min.The lime addition is 13%, and at 260 ℃ of stripping 90min, 13% sulphur of having an appointment this moment enters in the preroasting flue gas, and 49% sulphur enters Bayer process red mud, and 38% sulphur is with SO
4 2-Enter solution, mother liquid evaporation is to 240g/L, 60 ℃ of temperature, and sodium sulfate concentration is 8g/L in the solution.
Embodiment 4
Bauxite Al
2O
3Content 65.55%, SiO
2Content is 8.96%, and S content is 1.23%, 550 ℃ of preroasting 60min.The lime addition is 7%, and at 260 ℃ of stripping 90min, 14% the sulphur of having an appointment this moment enters in the flue gas, and 43% sulphur enters Bayer process red mud, and 43% sulphur is with SO
4 2-Enter solution, mother liquid evaporation is to 230g/L, 60 ℃ of temperature, and sodium sulfate concentration is 10g/L in the solution.
Embodiment 5
Bauxite Al
2O
3Content 58.66%, SiO
2Content is 14.14%, and S content is 1.18%, 580 ℃ of preroasting 30min.The lime addition is 7% during stripping, and at 265 ℃ of stripping 50min, 13% sulphur of having an appointment this moment enters in the preroasting flue gas, and 50% sulphur enters Bayer process red mud, and about 37% sulphur is with SO
4 2-Enter solution, mother liquid evaporation is cooled to 60 ℃ of temperature to 230g/L, and sodium sulfate concentration is 9g/L in the solution.
Claims (4)
1. one kind is utilized high-sulfur bauxite production method of alumina, it is characterized in that its production process is with the preroasting 5～60min under 350～850 ℃ of temperature of bauxite elder generation, and then carries out stripping, and a part of sulphur enters the roasting flue gas, and a part of sulphur is with SO
4 2-Form enters dissolution fluid.
2. a kind of high-sulfur bauxite production method of alumina of utilizing according to claim 1, what it is characterized in that described baking flue gas absorbs the processing desulfurization with Bayer process red mud.
3. a kind of high-sulfur bauxite production method of alumina of utilizing according to claim 1 is characterized in that described baking flue gas absorbs the processing desulfurization through milk of lime.
4. a kind of high-sulfur bauxite production method of alumina of utilizing according to claim 1 is characterized in that in the Bayer process process in leaching of the bauxite after the described roasting, with SO
4 2-Form enters the sulphur in the solution, at mother liquid evaporation to N
k230～250g/L, temperature is reduced to 40～60 ℃, Na in the solution
2SO
4Concentration be reduced to below the 10g/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101147879A CN101289210A (en) | 2008-06-12 | 2008-06-12 | Process for producing aluminum oxide from high-sulfur bauxite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101147879A CN101289210A (en) | 2008-06-12 | 2008-06-12 | Process for producing aluminum oxide from high-sulfur bauxite |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101289210A true CN101289210A (en) | 2008-10-22 |
Family
ID=40033692
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008101147879A Pending CN101289210A (en) | 2008-06-12 | 2008-06-12 | Process for producing aluminum oxide from high-sulfur bauxite |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101289210A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102107892A (en) * | 2009-12-23 | 2011-06-29 | 中国铝业股份有限公司 | Sulfur discharging method for using high-sulfur bauxite ore in mixed combination method |
| CN102502746A (en) * | 2011-10-14 | 2012-06-20 | 中南大学 | Method for removing S<2-> from sodium aluminate solution |
| CN102815730A (en) * | 2012-08-07 | 2012-12-12 | 北京化工大学 | Method for oxidation desulfurization-magnetization iron-removal pretreatment on high-sulfur content bauxite |
| CN102838144A (en) * | 2011-06-24 | 2012-12-26 | 贵阳铝镁设计研究院有限公司 | High sulfur decomposition mother liquid reinforcement salt removing and desulfurization method |
| CN102897812A (en) * | 2012-10-19 | 2013-01-30 | 北京化工大学 | Method for activating high-sulfur bauxite by means of low-temperature roasting desulfurization method |
| CN103896316A (en) * | 2014-03-06 | 2014-07-02 | 贵州大学 | Dissolution process and desulfurization method for producing aluminum oxide by using high sulfur bauxite |
-
2008
- 2008-06-12 CN CNA2008101147879A patent/CN101289210A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102107892A (en) * | 2009-12-23 | 2011-06-29 | 中国铝业股份有限公司 | Sulfur discharging method for using high-sulfur bauxite ore in mixed combination method |
| CN102107892B (en) * | 2009-12-23 | 2014-09-03 | 中国铝业股份有限公司 | Sulfur discharging method for using high-sulfur bauxite ore in mixed combination method |
| CN102838144A (en) * | 2011-06-24 | 2012-12-26 | 贵阳铝镁设计研究院有限公司 | High sulfur decomposition mother liquid reinforcement salt removing and desulfurization method |
| CN102502746A (en) * | 2011-10-14 | 2012-06-20 | 中南大学 | Method for removing S<2-> from sodium aluminate solution |
| CN102815730A (en) * | 2012-08-07 | 2012-12-12 | 北京化工大学 | Method for oxidation desulfurization-magnetization iron-removal pretreatment on high-sulfur content bauxite |
| CN102815730B (en) * | 2012-08-07 | 2016-08-24 | 北京化工大学 | Oxidation sweetening-the magnetization of a kind of high-sulfur bauxite removes ferrum preprocess method |
| CN102897812A (en) * | 2012-10-19 | 2013-01-30 | 北京化工大学 | Method for activating high-sulfur bauxite by means of low-temperature roasting desulfurization method |
| CN102897812B (en) * | 2012-10-19 | 2016-09-21 | 北京化工大学 | A kind of method of low-temperature bake doctor treatment activation processing high-sulfur bauxite |
| CN103896316A (en) * | 2014-03-06 | 2014-07-02 | 贵州大学 | Dissolution process and desulfurization method for producing aluminum oxide by using high sulfur bauxite |
| CN103896316B (en) * | 2014-03-06 | 2016-04-20 | 贵州大学 | A kind of dissolving-out process and sulfur method utilizing high-sulfur bauxite production aluminum oxide |
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Open date: 20081022 |