CN101665260A - Method for removing organic impurity - Google Patents
Method for removing organic impurity Download PDFInfo
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- CN101665260A CN101665260A CN200910308545A CN200910308545A CN101665260A CN 101665260 A CN101665260 A CN 101665260A CN 200910308545 A CN200910308545 A CN 200910308545A CN 200910308545 A CN200910308545 A CN 200910308545A CN 101665260 A CN101665260 A CN 101665260A
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- China
- Prior art keywords
- sodium aluminate
- aluminate solution
- bayer process
- organic impurity
- process sodium
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- 239000012535 impurity Substances 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 46
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 claims abstract description 80
- 229910001388 sodium aluminate Inorganic materials 0.000 claims abstract description 80
- -1 peroxy acid salt Chemical class 0.000 claims abstract description 33
- 238000005406 washing Methods 0.000 claims abstract description 17
- 238000004131 Bayer process Methods 0.000 claims description 75
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 36
- 239000010457 zeolite Substances 0.000 claims description 36
- 229910021536 Zeolite Inorganic materials 0.000 claims description 34
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 34
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical group NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 claims description 15
- 239000004160 Ammonium persulphate Substances 0.000 claims description 15
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 15
- 235000019395 ammonium persulphate Nutrition 0.000 claims description 15
- 238000004519 manufacturing process Methods 0.000 claims description 15
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 12
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 4
- 229910021502 aluminium hydroxide Inorganic materials 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 4
- VXAUWWUXCIMFIM-UHFFFAOYSA-M aluminum;oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Al+3] VXAUWWUXCIMFIM-UHFFFAOYSA-M 0.000 claims description 2
- 229910052593 corundum Inorganic materials 0.000 claims 2
- 229910001845 yogo sapphire Inorganic materials 0.000 claims 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 abstract description 5
- 239000002994 raw material Substances 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 72
- 239000006210 lotion Substances 0.000 description 11
- 239000013078 crystal Substances 0.000 description 10
- 229910001570 bauxite Inorganic materials 0.000 description 9
- 238000002425 crystallisation Methods 0.000 description 9
- 230000008025 crystallization Effects 0.000 description 9
- 235000019353 potassium silicate Nutrition 0.000 description 9
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 9
- 238000003756 stirring Methods 0.000 description 7
- 239000011734 sodium Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical group [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 238000012512 characterization method Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229920000289 Polyquaternium Polymers 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 229940097275 indigo Drugs 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000003796 beauty Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004737 colorimetric analysis Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000002223 garnet Substances 0.000 description 1
- 239000004021 humic acid Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 150000002605 large molecules Chemical class 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012452 mother liquor Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 229910001948 sodium oxide Inorganic materials 0.000 description 1
- 238000002798 spectrophotometry method Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012549 training Methods 0.000 description 1
Abstract
The invention aims at providing methods for removing organic impurity, wherein one of the methods comprises the following steps: adding peroxy acid salt into Bayer sodium aluminate solution to removeorganic impurity in the Bayer sodium aluminate solution; the other method is as follows: and using solution containing peroxy acid salt for washing matter prepared by taking Bayer sodium aluminate solution as raw material so as to remove the organic impurity in Bayer sodium aluminate solution. The methods for removing organic impurity can effectively remove organic impurity in the Bayer sodium aluminate solution; the technology is simple and convenient, does not need to be added with any new device; and the obtained Bayer sodium aluminate solution can serve as the raw material producing chemical aluminum oxide.
Description
Technical field
The present invention relates to a kind of method that removes organic impurity, particularly remove Bayer process sodium aluminate solution or be the method for organic impurity in the material of feedstock production with the Bayer process sodium aluminate solution.
Background technology
The aluminum oxide and the aluminium hydroxide of produced worldwide have more than 90% and produce with bayer process at present.Bayer process is used in handles low silicon bauxite, particularly is used in when handling gibbsitic bauxite, and flow process is simple, and operation is convenient, the quality product height, and its economic benefit is far from other method and can matches in excellence or beauty.Its technology is roughly: bauxite, lime and alkali lye are made raw pulp according to a certain percentage; Hydrated alumina under condition of high voltage in the stripping ore makes sodium aluminate solution.
The bauxite that uses during Bayer process is produced is distributed in many places in the world, different areas, and the composition of this ore may be different.No matter but which kind of mineral type all contains a small amount of organic impurity, these organic impuritys can be dissolved in sodium aluminate solution by the aluminum oxide in ore, and the sodium aluminate solution that is obtained is polluted.The most of organic impuritys that exist in the bauxite are made up of the high-molecular weight compound, as humic acid, and a part wherein will resolve into the compound of lower molecular weight in the high temperature process in leaching, thereby produce a series of organic salt that is dissolved in the sodium aluminate solution.A part that is dissolved in this class organic impurity in the sodium aluminate solution is a colored compound, humate for example, and this makes Bayer process sodium aluminate solution present distinctive garnet.Because what liquid caustic constantly recycled in the technology of Bayer process, so the continuous enrichment of the organic impurity content in the Bayer process sodium aluminate solution increases.When the enrichment of organic impurity reaches quite high concentration, will seriously disturb normally carrying out that Bayer process produces, as reducing Al
2O
3Solubility rate, the crystal seed of adding was lost efficacy, Al (OH)
3Product refinement, Al
2O
3Impurity increases, alkaline consumption increases, red-mud settlement speed reduction etc.The enrichment of organic impurity has simultaneously also limited the production that Bayer process sodium aluminate solution is used for chemical aluminum oxide.
How to remove accumulative organic impurities in the Bayer process sodium aluminate solution, expert both domestic and external has carried out a large amount of tests and research to this.Reported in literature and patent about this research are more, report: add Na in mother liquid evaporation
2C
2O
4H
2The O crystal seed is separated out organism; In mother liquor, washing lotion, add MnO
2, milk of lime removes organism; Add MgSO
4, caoxalate, calcium oxide etc. directly remove organism or the like from sodium aluminate solution.Above-mentioned all methods, complex process, efficient are not high, less economical, can not adapt to remove organic suitability for industrialized production from Bayer process sodium aluminate solution.
A kind of particulate state calcium oxide that in than the Bayer process refined liquid of dilute concentration, adds, stir the method that certain hour removes organic impurities at a certain temperature, can remove the organic impurity of a part, but the precipitation that generates is brought inconvenience to subsequent operations: on the one hand, contain aluminium hydroxide in this precipitation, alumina concentration in the Bayer process sodium aluminate solution is reduced, cause damage; On the other hand, must be with this throw out and solution separating, this will increase operation steps and increase the total mud amount that needs processing to a certain extent.
In the Bayer process dissolution fluid, add water miscible polyquaternium, consumption will be enough to form the part coating on the dispersion red mud is stopped admittedly, keep coating to contact the regular hour with Bayer process sodium aluminate solution, then Bayer process sodium aluminate solution is separated with red mud, can obtain the Bayer process sodium aluminate solution that the humic salts contg greatly reduces.This method can be removed the organic impurity in the Bayer process sodium aluminate solution really, but polyquaternium needs synthetic separately and itself comparatively expensive expense, has limited the industrial application of this method.
Therefore seek a kind of economy, simply, effectively remove the method for organic impurity in the Bayer process sodium aluminate solution, for stablize the bayer process flow process, the Application Areas of expansion Bayer process sodium aluminate solution has very important significance.
Summary of the invention
The invention provides a kind of method that removes organic impurity, purpose provides and a kind ofly simple and effectively removes Bayer process sodium aluminate solution or be the method for organic impurity in the material of feedstock production with the Bayer process sodium aluminate solution.
A method that removes organic impurity of the present invention is to add peracid salt to remove organic impurity in the Bayer process sodium aluminate solution in Bayer process sodium aluminate solution.
Described peracid salt is Sodium Persulfate, ammonium persulphate or hydrogen peroxide.
The Sodium Persulfate that adds (0.5-10) kg in described every cubic metre the Bayer process sodium aluminate solution.
The ammonium persulphate that adds (0.5-10) kg in described every cubic metre the Bayer process sodium aluminate solution.
The volume ratio of described Bayer process sodium aluminate solution and described hydrogen peroxide can be (100-40): 1.
Along with the increase of described peracid salt add-on, the organic impurity clearance constantly raises.
Of the present invention another removes the method for organic impurity, is to be the material of feedstock production with the solution washing that contains peracid salt with the Bayer process sodium aluminate solution, removes the organic impurity in the Bayer process sodium aluminate solution.
Described is that the material of feedstock production is aluminium hydroxide, pseudo-boehmite or zeolite with the Bayer process sodium aluminate solution.
Described peracid salt is Sodium Persulfate, ammonium persulphate or hydrogen peroxide.
Described is that the material of feedstock production and the mass ratio of described Sodium Persulfate are 1 with the Bayer process sodium aluminate solution: (0.06-0.09).
Described is that the material of feedstock production and the mass ratio of described ammonium persulphate are 1 with the Bayer process sodium aluminate solution: (0.06-0.09).
Described is that the material of feedstock production and the mass ratio of described hydrogen peroxide are 1 with the Bayer process sodium aluminate solution: (0.03-0.06).
The described solution that contains peracid salt also contains Na
2O
TAnd Al
2O
3, described Na
2O
TConcentration greater than 0 smaller or equal to 10g/L, described Al
2O
3Concentration greater than 0 smaller or equal to 1g/L.
The method that removes organic impurity of the present invention, can effectively remove organic impurities in the Bayer process sodium aluminate solution, along with the increase organic impurity clearance of peracid salt add-on constantly raises, adding 0.5g/L Sodium Persulfate organic impurity clearance is 20.31%, and adding 7.5g/L Sodium Persulfate organic impurity clearance is 85.94%; Adding 0.5g/L ammonium persulphate organic impurity clearance is 23.44%, and adding 7.5g/L ammonium persulphate organic impurity clearance is 87.50%; Adding hydrogen peroxide organic impurity clearance at 100: 1 by the volume ratio of Bayer process sodium aluminate solution and hydrogen peroxide is 40.58%, and adding hydrogen peroxide organic impurity clearance at 40: 1 by the volume ratio of Bayer process sodium aluminate solution and hydrogen peroxide is 69.57%.
The method technology that removes organic impurity of the present invention is easy, need not newly-increased any equipment.
The Bayer process sodium aluminate solution that the method that removes organic impurity of the present invention obtains can be used as the raw material of producing chemical aluminum oxide, as is used for producing the 4A zeolite, and the 4A zeolite whiteness that obtains is 97.5%-99.2%, and the b value is 0.36-0.68%.
Embodiment
Embodiment 1,
The ore pulp of gibbsitic bauxite stripping, through separating red mud, secondary filter, adjustment concentration of component, obtain Bayer process sodium aluminate solution behind the desilication reaction, in the transport pipe or storage tank of Bayer process sodium aluminate solution, the peracid salt that directly adds different amounts, as Sodium Persulfate, ammonium persulphate or hydrogen peroxide, what make peracid salt and Bayer process sodium aluminate solution contacts 15-30 minute
Get the Bayer process sodium aluminate solution 200mL after the above-mentioned processing, the amount of organic impurity in the colorimetric method for determining Bayer process sodium aluminate solution, concrete grammar is: use the 1cm cell, do blank with distilled water, with spectrophotometric determination 690nm place, absorbancy behind original absorbancy when not adding peracid salt and the adding peracid salt is calculated the organic impurity clearance according to following formula then.
Formula: organic impurity clearance=(absorbancy behind original absorbancy-adding peracid salt) the original absorbancy of ÷ * 100%.
The result of organic impurity clearance as shown in Table 1, 2 and 3.
Table 1, interpolation Sodium Persulfate organic impurity clearance
Table 2, interpolation ammonium persulphate organic impurity clearance
Table 3, interpolation hydrogen peroxide organic impurity clearance
| The volume ratio of Bayer process sodium aluminate solution and hydrogen peroxide | Absorbancy | Organic impurity clearance (%) |
| ??0 | ??0.069 | ??0 |
| ??100∶1 | ??0.041 | ??40.58 |
| ??100∶1 | ??0.044 | ??36.23 |
| ??200∶3 | ??0.036 | ??47.83 |
| ??50∶1 | ??0.023 | ??66.67 |
| ??40∶1 | ??0.021 | ??69.57 |
The result of organic impurity clearance shows that along with the increase of peracid salt amount, the organic impurity clearance constantly raises.
Embodiment 2,
The ore pulp of gibbsitic bauxite stripping through separating red mud, secondary filter, adjustment concentration of component, obtains Bayer process sodium aluminate solution, the Al of Bayer process sodium aluminate solution behind the desilication reaction
2O
3Concentration is 75g/L, α
Ko=2.3, temperature is 60 ℃.
In above-mentioned Bayer process sodium aluminate solution, add peracid salt, stirred 15 minutes, then according to the mole ratio of components (SiO of water glass and Bayer process sodium aluminate solution
2/ Al
2O
3)=1.95 with above-mentioned Bayer process sodium aluminate solution and temperature be 25-30 ℃ water glass continuously and stream synthetic, stir, mixing speed is 45 rev/mins, wherein, the SiO of water glass
2Weight percent concentration is 25%.
Solution after the above-mentioned stirring is continuously injected the pulp groove, enter the crystallization groove by the pulp groove, 70 ℃ of following crystallization 2 hours, 95 ℃ of crystallization 1 hour were through separating, obtaining the 4A zeolite after the washing, oven dry.
Press Bayer process sodium aluminate solution (m in the aforesaid method
3): first kind of 4A zeolite of 4A zeolite called after of peracid salt (kg)=1: 3 adding ammonium persulphate acquisition.
Press Bayer process sodium aluminate solution (m in the aforesaid method
3): second kind of 4A zeolite of 4A zeolite called after of peracid salt (kg)=1: 5 adding Sodium Persulfate acquisition.
Press Bayer process sodium aluminate solution (m in the aforesaid method
3): peracid salt (m
3)=100: 1 add the third 4A zeolite of 4A zeolite called after that hydrogen peroxide obtains.
The index such as the table 4 of three kinds of 4A zeolites:
The index of table 4.4A zeolite
| First kind of 4A zeolite | The calcium exchange | Igloss % | ??pH | ??L％ | ??a％ |
| ??304 | ??19.65 | ??11.00 | ??98.9 | ??-0.03 | |
| ??b％ | Whiteness % | + 325 order % | Particle diameter D50um | Degree of crystallinity % | |
| ??0.36 | ??97.8 | ??0.28 | ??1.6 | ??80.8 | |
| Second kind of 4A zeolite | The calcium exchange | Igloss % | ??pH | ??L％ | ??a％ |
| ??305 | ??18.46 | ??11.00 | ??98.62 | ??0.02 | |
| ??b％ | Whiteness % | + 325 order % | Particle diameter D50um | Degree of crystallinity % | |
| ??0.63 | ??97.5 | ??0.3 | ??2.041 | ??72.9 | |
| The third 4A zeolite | The calcium exchange | Igloss % | ??pH | ??L％ | ??a％ |
| ??308 | ??19.23 | ??11.09 | ??98.37 | ??0.12 | |
| ??b％ | Whiteness % | + 325 order % | Particle diameter D50um | Degree of crystallinity % | |
| ??0.52 | ??99.2 | ??0.84 | ??2.024 | ??84.7 |
L, a, b are the characterization values of object chrominance in the table 4, and that L represents is bright-dark axle, a represents red-green axle, b Biao Shi Yellow-indigo plant spool
The result of table 4 shows that aforesaid method removed the organic impurity in the Bayer process sodium aluminate solution, and the 4A zeolite whiteness, the b value index that prepare with the Bayer process sodium aluminate solution of removing organic impurity have all reached standard-required.
Embodiment 3,
The ore pulp of gibbsitic bauxite stripping through separating red mud, secondary filter, adjustment concentration of component, obtains Bayer process sodium aluminate solution, the Al of Bayer process sodium aluminate solution behind the desilication reaction
2O
3Concentration is 75g/L, α
Ko=2.3, temperature is 60 ℃.
Then according to the mole ratio of components (SiO of water glass and Bayer process sodium aluminate solution
2/ Al
2O
3)=1.95 with above-mentioned Bayer process sodium aluminate solution and temperature be 25-30 ℃ water glass continuously and stream synthetic, stir, mixing speed is 45 rev/mins, wherein, the SiO of water glass
2Weight percent concentration is 25%.
Solution after the above-mentioned stirring is continuously injected the pulp groove, enter the crystallization groove by the pulp groove, 70 ℃ of following crystallization 2 hours, 95 ℃ of crystallization 1 hour, obtain crystal, crystal obtains the 4A zeolite after using the washing lotion washing and drying that contains peracid salt, and the washing lotion that contains peracid salt is to add peracid salt in washing lotion, and washing lotion is Na
2O
TAnd Al
2O
3The aqueous solution, Na wherein
2O
TThe total alkali concn of expression sodium aluminate solution, in sodium oxide, Na
2O
TGreater than 0 smaller or equal to 10g/L, Al
2O
3Concentration greater than 0 smaller or equal to 1g/L.
In washing lotion, press crystal (ton) in the aforesaid method: the 4th kind of 4A zeolite of 4A zeolite called after of peracid salt (ton)=1: 0.06 adding Sodium Persulfate acquisition.
In washing lotion, press crystal (ton) in the aforesaid method: the 5th kind of 4A zeolite of 4A zeolite called after of peracid salt (ton)=1: 0.09 adding Sodium Persulfate acquisition.
In washing lotion, press crystal (ton) in the aforesaid method: the 6th kind of 4A zeolite of 4A zeolite called after of peracid salt (ton)=1: 0.06 adding ammonium persulphate acquisition.
In washing lotion, press crystal (ton) in the aforesaid method: the 7th kind of 4A zeolite of 4A zeolite called after of peracid salt (ton)=1: 0.09 adding ammonium persulphate acquisition.
In washing lotion, press crystal (ton) in the aforesaid method: peracid salt (ton)=the 8th kind of 4A zeolite of 1: 0.03 adding hydrogen peroxide called after.
In washing lotion, press the 9th kind of 4A zeolite of 4A zeolite called after of crystal (ton) peracid salt (ton)=1: 0.06 adding hydrogen peroxide acquisition in the aforesaid method.
The index such as the table 5 of six kinds of 4A zeolites:
The index of table 5.4A zeolite
L, a, b are the characterization values of object chrominance in the table 5, and that L represents is bright-dark axle, a represents red-green axle, b Biao Shi Yellow-indigo plant spool
The result of table 5 shows that it is organic impurity in the 4A zeolite of feedstock production with the Bayer process sodium aluminate solution that aforesaid method has been removed, and the 4A zeolite whiteness, the b value index that obtain have all reached standard-required.
Comparative Examples,
The ore pulp of gibbsitic bauxite stripping through separating red mud, secondary filter, adjustment concentration of component, obtains Bayer process sodium aluminate solution, the Al of Bayer process sodium aluminate solution behind the desilication reaction
2O
3Concentration is 75g/L, α
Ko=2.3, temperature is 60 ℃.
Then according to the mole ratio of components (SiO of water glass and Bayer process sodium aluminate solution
2/ Al
2O
3)=1.95 with above-mentioned Bayer process sodium aluminate solution and temperature be 25-30 ℃ water glass continuously and stream synthetic, stir, mixing speed is 45 rev/mins, wherein, the SiO of water glass
2Weight percent concentration is 25%.
Solution after the above-mentioned stirring is continuously injected the pulp groove, enter the crystallization groove by the pulp groove, 70 ℃ of following crystallization 2 hours, 95 ℃ of crystallization 1 hour were through separating, obtaining the 4A zeolite after the washing, oven dry.
The index such as the table 6 of 4A zeolite:
The index of table 6.4A zeolite
L, a, b are the characterization values of object chrominance in the table 6, and L represents that bright Hiiragi supports the red Bo Tao Man Cheng Biao Shi Yellow Ao ton curtain of curtain training expression
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (10)
1. method that removes organic impurity is to add peracid salt to remove organic impurity in the Bayer process sodium aluminate solution in Bayer process sodium aluminate solution.
2. the method that removes organic impurity according to claim 1 is characterized in that: described peracid salt is Sodium Persulfate, ammonium persulphate or hydrogen peroxide.
3. the method that removes organic impurity according to claim 2 is characterized in that: the Sodium Persulfate that adds (0.5-10) kg in described every cubic metre the Bayer process sodium aluminate solution.
4. the method that removes organic impurity according to claim 2 is characterized in that: the ammonium persulphate that adds (0.5-10) kg in described every cubic metre the Bayer process sodium aluminate solution.
5. the method that removes organic impurity according to claim 2 is characterized in that: the volume ratio of described Bayer process sodium aluminate solution and described hydrogen peroxide is (100-40): 1.
6. method that removes organic impurity is to be the material of feedstock production with the solution washing that contains peracid salt with the Bayer process sodium aluminate solution, removes the organic impurity in the Bayer process sodium aluminate solution.
7. the method that removes organic impurity according to claim 6 is characterized in that: described is that the material of feedstock production is aluminium hydroxide, pseudo-boehmite or zeolite with the Bayer process sodium aluminate solution.
8. according to claim 6 or the 7 described methods that remove organic impurity, it is characterized in that: described peracid salt is Sodium Persulfate, ammonium persulphate or hydrogen peroxide.
9. the method that removes organic impurity according to claim 8 is characterized in that: described is that the material of feedstock production and the mass ratio of described Sodium Persulfate are 1 with the Bayer process sodium aluminate solution: (0.06-0.09); Described is that the material of feedstock production and the mass ratio of described ammonium persulphate are 1 with the Bayer process sodium aluminate solution: (0.06-0.09); Described is that the material of feedstock production and the mass ratio of described hydrogen peroxide are 1 with the Bayer process sodium aluminate solution: (0.03-0.06).
10. the method that removes organic impurity according to claim 9, it is characterized in that: the described solution that contains peracid salt also contains Na2OT and Al2O3, the concentration of described Na2OT is greater than 0 smaller or equal to 10g/L, the concentration of described Al2O3 greater than 0 smaller or equal to 1g/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910308545A CN101665260A (en) | 2009-10-21 | 2009-10-21 | Method for removing organic impurity |
Applications Claiming Priority (1)
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102502732A (en) * | 2011-10-21 | 2012-06-20 | 河南煤业化工集团研究院有限责任公司 | Purification method of high-concentration sodium aluminate solution from Bayer process |
| CN105233991A (en) * | 2015-09-17 | 2016-01-13 | 中国铝业股份有限公司 | Method for synchronously removing sulfur and organic matter of bauxite through reverse flotation |
| CN115259194A (en) * | 2022-07-21 | 2022-11-01 | 中国铝业股份有限公司 | Method for removing humus in production process of aluminum oxide |
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2009
- 2009-10-21 CN CN200910308545A patent/CN101665260A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102502732A (en) * | 2011-10-21 | 2012-06-20 | 河南煤业化工集团研究院有限责任公司 | Purification method of high-concentration sodium aluminate solution from Bayer process |
| CN105233991A (en) * | 2015-09-17 | 2016-01-13 | 中国铝业股份有限公司 | Method for synchronously removing sulfur and organic matter of bauxite through reverse flotation |
| CN105233991B (en) * | 2015-09-17 | 2018-02-02 | 中国铝业股份有限公司 | A kind of method that inverse floatation of bauxite synchronized desulfuring takes off organic matter |
| CN115259194A (en) * | 2022-07-21 | 2022-11-01 | 中国铝业股份有限公司 | Method for removing humus in production process of aluminum oxide |
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