CN112142071A - Sintering method seed precipitation mother liquor treatment method - Google Patents
Sintering method seed precipitation mother liquor treatment method Download PDFInfo
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- CN112142071A CN112142071A CN202010826753.3A CN202010826753A CN112142071A CN 112142071 A CN112142071 A CN 112142071A CN 202010826753 A CN202010826753 A CN 202010826753A CN 112142071 A CN112142071 A CN 112142071A
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- mother liquor
- precipitation mother
- seed precipitation
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- 238000000034 method Methods 0.000 title claims abstract description 59
- 238000005245 sintering Methods 0.000 title claims abstract description 36
- 239000012452 mother liquor Substances 0.000 title claims abstract description 35
- 238000001556 precipitation Methods 0.000 title claims abstract description 34
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 47
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 33
- 239000012065 filter cake Substances 0.000 claims abstract description 24
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 23
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910001388 sodium aluminate Inorganic materials 0.000 claims abstract description 21
- 239000002002 slurry Substances 0.000 claims abstract description 19
- 239000000706 filtrate Substances 0.000 claims abstract description 16
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 14
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 14
- 239000004571 lime Substances 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims abstract description 14
- 238000001914 filtration Methods 0.000 claims abstract description 13
- 239000008267 milk Substances 0.000 claims abstract description 12
- 210000004080 milk Anatomy 0.000 claims abstract description 12
- 235000013336 milk Nutrition 0.000 claims abstract description 12
- 230000032683 aging Effects 0.000 claims abstract description 10
- 238000001035 drying Methods 0.000 claims abstract description 10
- 238000005406 washing Methods 0.000 claims abstract description 10
- 238000004131 Bayer process Methods 0.000 claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 13
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 10
- 239000000920 calcium hydroxide Substances 0.000 claims description 10
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 10
- 239000008367 deionised water Substances 0.000 claims description 9
- 229910021641 deionized water Inorganic materials 0.000 claims description 9
- 239000013078 crystal Substances 0.000 claims description 7
- 238000007605 air drying Methods 0.000 claims description 6
- 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
- 239000013589 supplement Substances 0.000 abstract description 4
- 239000000047 product Substances 0.000 abstract description 3
- 239000006227 byproduct Substances 0.000 abstract description 2
- 239000012760 heat stabilizer Substances 0.000 abstract description 2
- 239000002351 wastewater Substances 0.000 abstract description 2
- 238000003912 environmental pollution Methods 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 11
- 238000000354 decomposition reaction Methods 0.000 description 8
- 238000001878 scanning electron micrograph Methods 0.000 description 4
- 238000000926 separation method Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910001570 bauxite Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000006071 cream Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 238000009856 non-ferrous metallurgy Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- POWFTOSLLWLEBN-UHFFFAOYSA-N tetrasodium;silicate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-][Si]([O-])([O-])[O-] POWFTOSLLWLEBN-UHFFFAOYSA-N 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D1/00—Oxides or hydroxides of sodium, potassium or alkali metals in general
- C01D1/04—Hydroxides
- C01D1/20—Preparation by reacting oxides or hydroxides with alkali metal salts
- C01D1/22—Preparation by reacting oxides or hydroxides with alkali metal salts with carbonates or bicarbonates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D1/00—Oxides or hydroxides of sodium, potassium or alkali metals in general
- C01D1/04—Hydroxides
- C01D1/20—Preparation by reacting oxides or hydroxides with alkali metal salts
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/16—Preparation of alkaline-earth metal aluminates or magnesium aluminates; Aluminium oxide or hydroxide therefrom
- C01F7/164—Calcium aluminates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
- C01P2004/03—Particle morphology depicted by an image obtained by SEM
Abstract
The invention discloses a sintering method seed precipitation mother liquor treatment method, which comprises the following steps: uniformly mixing the sintering method seed precipitation mother liquor with lime milk, and stirring at the constant temperature of 40-70 ℃ for 0.5-2 h to obtain slurry; then ageing the slurry at the constant temperature of 60-80 ℃ for 6-24 h, filtering to obtain filtrate and a filter cake, and finally washing and drying the filter cake. The obtained filtrate, namely the sodium hydroxide solution, can supplement sodium hydroxide for a Bayer process system, and the filter cake, namely the hydrocalumite, can be used as a PVC heat stabilizer. The two products obtained by the method have higher economic value and no other by-products, thereby not only avoiding the environmental pollution caused by the waste water generated in the production, but also fully utilizing the sodium aluminate and the sodium carbonate in the seed precipitation mother liquor of the sintering method.
Description
Technical Field
The invention relates to the technical field of nonferrous metallurgy, in particular to a sintering method seed precipitation mother liquor treatment method.
Background
The intensified sintering method is to sinter soda, lime and bauxite at the same time, and to react the alumina in bauxite at high temperature to produce sodium aluminate which is easy to dissolve in water, iron oxide to produce sodium ferrite which is easy to hydrolyze, and silicon dioxide to produce sodium orthosilicate which is not soluble in water, thus forming the main component of clinker. Dissolving clinker in dilute alkali solution, and performing rapid separation of red mud and two-stage desilication process to obtain refined sodium aluminate solution with high sodium aluminate concentration. The refined sodium aluminate solution induces the decomposition of sodium aluminate to generate aluminum hydroxide and sodium hydroxide by adding aluminum hydroxide seed crystal under a certain temperature condition, and the aluminum hydroxide and the sodium hydroxide are main components of aluminum hydroxide slurry. The filtrate obtained by filtering the aluminum hydroxide slurry for one time is called seed precipitation mother liquor of the sintering method.
The utilization of seed precipitation mother liquor by a sintering method mainly has two forms at present: one is to add the seed precipitation mother liquor into the Bayer process system to supplement sodium hydroxide for the Bayer process system; one is to conduct carbonation deep decomposition on the seed precipitation mother liquor to obtain aluminum hydroxide and sodium carbonate, the aluminum hydroxide is recycled after being filtered, and the sodium carbonate returns to a sintering method batching system again.
The sintering method seed precipitation mother liquor is added into a Bayer method system, sodium hydroxide can be supplemented for the Bayer method system, however, the sintering method seed precipitation mother liquor contains 35-52 g/L of sodium carbonate, and the sodium carbonate does not participate in the reaction of the Bayer method system, so that the sodium carbonate is continuously accumulated, and the normal operation of the Bayer method system is influenced. In order to solve the problem, the Bayer process system adopts evaporation salt removal at present, and sodium carbonate in the Bayer process system is recrystallized and then discharged out of the system. Although the method can discharge sodium carbonate out of a Bayer process system, the energy consumption is high, and the method is not beneficial to reducing the product cost.
The aluminum hydroxide with flame retardant property can be obtained by carbonating and decomposing the seed precipitation mother liquor by the sintering method, but the yield is low because the carbonating and deep decomposition reaction conditions of the seed precipitation mother liquor are harsh. The sodium carbonate obtained by decomposing the mother carbonate can be applied to a batching system of a sintering method, but the sodium carbonate obtained by decomposing cannot be continuously supplied for a long time due to the capacity of the batching system of the sintering method. In addition, the carbonation decomposition of the sintering method seed precipitation mother liquor is a single-tank decomposition at present, the decomposition period is long, and the sintering method seed precipitation mother liquor cannot be continuously subjected to carbonation decomposition. Along with the improvement of the productivity of the sintering seed separation system, the development of the reutilization technology of seed separation mother liquor is urgent.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a sintering method seed precipitation mother liquor treatment method.
The invention is realized by the following technical scheme.
A sintering seed precipitation mother liquor treatment method is characterized by comprising the following steps: uniformly mixing the sintering method seed precipitation mother liquor with lime milk, and stirring at the constant temperature of 40-70 ℃ for 0.5-2 h to obtain slurry; then ageing the slurry at the constant temperature of 60-80 ℃ for 6-24 h, filtering to obtain filtrate and a filter cake, and finally washing and drying the filter cake.
The main reaction equation of the treatment process is as follows:
2NaAlO2+4Ca(OH)2+Na2CO3+9H2O→3CaO·Al2O3·CaCO3·11H2O+4NaOH
further, the sintering method seed precipitation mother liquor is refined sodium aluminate solution produced by an alumina production system by a reinforced sintering method, aluminum hydroxide seed crystals are added for decomposition to obtain aluminum hydroxide slurry, and then filtrate is obtained through primary filtration.
Further, the concentration of sodium carbonate in the seed precipitation mother liquor of the sintering method is 35-52 g/L, the concentration of sodium aluminate is 64-80 g/L, and the concentration of calcium hydroxide in the lime milk is 9% by mass; the lime milk and the sintering method seed precipitation mother liquor are added according to the molar ratio of calcium hydroxide to sodium carbonate of 4:1 or the molar ratio of calcium hydroxide to sodium aluminate of 2: 1.
Further, the filtrate is obtained by aging the slurry at a constant temperature and filtering the aged slurry once by using a filter.
Further, the filtrate may be used as a supplement to sodium hydroxide used in bayer process systems.
Further, the cake washing means washing with hot deionized water 4 times.
Further, the temperature of the hot deionized water is 90 ℃.
Further, the drying refers to drying the washed filter cake in a 110 ℃ forced air drying oven for 24 hours.
The method has the beneficial technical effects that the method mixes the seed precipitation mother liquor with the lime cream according to a certain stoichiometric ratio by a sintering method, and obtains the sodium hydroxide solution and the hydrocalumite filter cake with higher purity through aging and filtering. The sodium hydroxide solution can supplement sodium hydroxide for a Bayer process system, and the hydrocalumite filter cake can be used as a PVC heat stabilizer after being washed and dried. The two products obtained by the method have high economic value and no other by-products, so that the environment pollution caused by waste water generated in production is avoided, the sodium aluminate and the sodium carbonate in the seed precipitation mother liquor of the sintering method are fully utilized, and zero emission is realized.
Drawings
FIG. 1 is an X-ray diffraction pattern of the filter cake (hydrocalumite) prepared by the present invention.
FIG. 2 is a scanning electron micrograph of a filter cake (hydrocalumite) prepared in example 1 of the present invention.
FIG. 3 is a scanning electron micrograph of the filter cake (hydrocalumite) prepared in example 2 of the present invention.
FIG. 4 is a scanning electron micrograph of a filter cake (hydrocalumite) prepared in example 3 of the present invention.
FIG. 5 is a scanning electron micrograph of a filter cake (hydrocalumite) prepared in example 4 of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Example 1:
putting the seed precipitation mother liquor (the concentration of sodium carbonate is 43g/L and the concentration of sodium aluminate is 64g/L) in a reaction vessel, stirring in a water bath, keeping the temperature at 40 ℃, slowly adding lime milk according to the molar ratio of calcium hydroxide (the concentration is 9%) to sodium aluminate of 2:1, stirring in a water bath at 40 ℃ for reaction for 0.5h, and then aging in a water bath at 60 ℃ for 24h to age and grow the hydrocalumite crystals. And filtering the slurry, collecting filtrate, washing a filter cake for 4 times by using hot deionized water at the temperature of 90 ℃, and drying the filter cake for 24 hours in a 110 ℃ forced air drying oven to obtain a hydrocalumite sample 1.
Example 2:
putting the sintering method seed precipitation mother liquor (the concentration of sodium carbonate is 52g/L and the concentration of sodium aluminate is 70g/L) into a reaction container, stirring in a water bath, keeping the temperature at 60 ℃, slowly adding lime milk according to the molar ratio of calcium hydroxide (the concentration is 9%) to sodium aluminate of 2:1, stirring in a water bath at 60 ℃ for reaction for 1h, and then aging in a water bath at 70 ℃ for 6h to age and grow the hydrocalumite crystals. And filtering the slurry, collecting filtrate, washing a filter cake for 4 times by using hot deionized water at the temperature of 90 ℃, and drying the filter cake for 24 hours in a 110 ℃ forced air drying oven to obtain a hydrocalumite sample 2.
Example 3:
putting seed precipitation mother liquor (the concentration of sodium carbonate is 35g/L and the concentration of sodium aluminate is 75g/L) in a reaction vessel, stirring in a water bath, keeping the temperature at 60 ℃, slowly adding lime milk according to the molar ratio of calcium hydroxide (the concentration is 9%) to sodium carbonate of 4:1, stirring in a water bath at 60 ℃ for reaction for 1h, and then aging in a water bath at 60 ℃ for 10h to age and grow the hydrocalumite crystal. And filtering the slurry, collecting filtrate, washing a filter cake for 4 times by using hot deionized water at the temperature of 90 ℃, and drying the filter cake for 24 hours in a 110 ℃ forced air drying oven to obtain a hydrocalumite sample 3.
Example 4:
putting the sintering method seed precipitation mother liquor (the concentration of sodium carbonate is 48g/L and the concentration of sodium aluminate is 80g/L) into a reaction container, stirring in a water bath, keeping the temperature at 70 ℃, slowly adding lime milk according to the molar ratio of calcium hydroxide (the concentration is 9%) to sodium carbonate of 4:1, stirring in a water bath at 70 ℃ for reacting for 2 hours, and then aging in a water bath at 80 ℃ for 18 hours to age and grow the hydrocalumite crystal. And filtering the slurry, collecting filtrate, washing a filter cake for 4 times by using hot deionized water at the temperature of 90 ℃, and drying the filter cake for 24 hours in a 110 ℃ forced air drying oven to obtain a hydrocalumite sample 4.
Comparative example 1:
putting the seed precipitation mother liquor obtained by the sintering method into a reaction container, stirring in a water bath, keeping the temperature at 40 ℃, adding deionized water with the same amount as that of the lime milk obtained in the example 1, stirring in a water bath at 60 ℃ for reaction for 1 hour, then stirring in a water bath at 70 ℃ for 24 hours, and analyzing the content of sodium carbonate and sodium aluminate of the obtained solution and the filtrate obtained in the examples 1-4, wherein the results are shown in the following table:
the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention. It should be noted that other equivalent modifications can be made by those skilled in the art in light of the teachings of the present invention, and all such modifications can be made as are within the scope of the present invention.
Claims (8)
1. A sintering seed precipitation mother liquor treatment method is characterized by comprising the following steps: uniformly mixing the sintering method seed precipitation mother liquor with lime milk, and stirring at the constant temperature of 40-70 ℃ for 0.5-2 h to obtain slurry; then ageing the slurry at the constant temperature of 60-80 ℃ for 6-24 h, filtering to obtain filtrate and a filter cake, and finally washing and drying the filter cake.
2. The method according to claim 1, wherein the seed precipitation mother liquor of the sintering method is refined sodium aluminate solution produced in an alumina production system of the reinforced sintering method, aluminum hydroxide seed crystals are added to decompose the refined sodium aluminate solution to obtain aluminum hydroxide slurry, and the aluminum hydroxide slurry is subjected to primary filtration to obtain filtrate.
3. The method according to any one of claims 1-2, characterized in that the concentration of sodium carbonate in the seed precipitation mother liquor of the sintering method is 35-52 g/L, the concentration of sodium aluminate is 64-80 g/L, and the concentration of calcium hydroxide in the lime milk is 9% by mass; the lime milk and the sintering method seed precipitation mother liquor are added according to the molar ratio of calcium hydroxide to sodium carbonate of 4:1 or the molar ratio of calcium hydroxide to sodium aluminate of 2: 1.
4. The method according to any one of claims 1 to 2, wherein the filtrate is obtained by subjecting the slurry to a constant-temperature aging and then subjecting the slurry to a single filtration with a filter.
5. The method of any one of claims 1-2, wherein the filtrate is supplemented with sodium hydroxide used in a bayer process system.
6. The method of any of claims 1-2, wherein the cake washing is 4 washes with hot deionized water.
7. The method of claim 6, wherein the hot deionized water temperature is 90 ℃.
8. The method according to any one of claims 1 to 2, wherein the drying is carried out by placing the washed filter cake in a 110 ℃ forced air drying oven for 24 hours.
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| CN202010826753.3A CN112142071A (en) | 2020-08-17 | 2020-08-17 | Sintering method seed precipitation mother liquor treatment method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030129125A1 (en) * | 1998-09-25 | 2003-07-10 | Rosenberg Steven Philip | Bayer causticisation |
| CN1843920A (en) * | 2006-05-17 | 2006-10-11 | 中国铝业股份有限公司 | Ash conversion method in alumina preparation |
| CN101186324A (en) * | 2007-12-17 | 2008-05-28 | 中国铝业股份有限公司 | Deep decomposition method for sodium aluminate solution |
| CN102303941A (en) * | 2011-09-14 | 2012-01-04 | 中国科学院过程工程研究所 | Deep dealkalizing method of red mud in alumina factory |
| CN105217666A (en) * | 2015-10-21 | 2016-01-06 | 中电投山西铝业有限公司 | The clean preparation method of hydrocalumite |
-
2020
- 2020-08-17 CN CN202010826753.3A patent/CN112142071A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030129125A1 (en) * | 1998-09-25 | 2003-07-10 | Rosenberg Steven Philip | Bayer causticisation |
| CN1843920A (en) * | 2006-05-17 | 2006-10-11 | 中国铝业股份有限公司 | Ash conversion method in alumina preparation |
| CN101186324A (en) * | 2007-12-17 | 2008-05-28 | 中国铝业股份有限公司 | Deep decomposition method for sodium aluminate solution |
| CN102303941A (en) * | 2011-09-14 | 2012-01-04 | 中国科学院过程工程研究所 | Deep dealkalizing method of red mud in alumina factory |
| CN105217666A (en) * | 2015-10-21 | 2016-01-06 | 中电投山西铝业有限公司 | The clean preparation method of hydrocalumite |
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Application publication date: 20201229 |