CN113929124A - Organic matter removing method for alumina production - Google Patents
Organic matter removing method for alumina production Download PDFInfo
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- CN113929124A CN113929124A CN202110992880.5A CN202110992880A CN113929124A CN 113929124 A CN113929124 A CN 113929124A CN 202110992880 A CN202110992880 A CN 202110992880A CN 113929124 A CN113929124 A CN 113929124A
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- filter
- production
- organic matters
- boiler
- liquor
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 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 12
- 239000005416 organic matter Substances 0.000 title description 4
- 238000001704 evaporation Methods 0.000 claims abstract description 11
- 230000008020 evaporation Effects 0.000 claims abstract description 11
- 238000003825 pressing Methods 0.000 claims abstract description 11
- 239000012452 mother liquor Substances 0.000 claims abstract description 10
- 239000000428 dust Substances 0.000 claims abstract description 7
- 238000003860 storage Methods 0.000 claims abstract description 7
- 239000002956 ash Substances 0.000 claims abstract description 5
- 239000012065 filter cake Substances 0.000 claims abstract description 5
- 239000010881 fly ash Substances 0.000 claims abstract description 5
- 239000010883 coal ash Substances 0.000 claims abstract description 4
- 239000013049 sediment Substances 0.000 claims abstract description 4
- 239000003513 alkali Substances 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 2
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 abstract description 7
- 239000000047 product Substances 0.000 abstract description 7
- 230000009286 beneficial effect Effects 0.000 abstract description 5
- 238000002156 mixing Methods 0.000 abstract description 5
- 238000001914 filtration Methods 0.000 abstract description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 abstract description 4
- 206010039509 Scab Diseases 0.000 abstract description 3
- 239000012535 impurity Substances 0.000 abstract description 3
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 abstract description 2
- 229910001948 sodium oxide Inorganic materials 0.000 abstract description 2
- 238000002485 combustion reaction Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 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 2
- 238000004131 Bayer process Methods 0.000 description 2
- 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 2
- 239000010426 asphalt Substances 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 239000004021 humic acid Substances 0.000 description 2
- 229940039748 oxalate Drugs 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- ZNCPFRVNHGOPAG-UHFFFAOYSA-L sodium oxalate Chemical compound [Na+].[Na+].[O-]C(=O)C([O-])=O ZNCPFRVNHGOPAG-UHFFFAOYSA-L 0.000 description 2
- 229940039790 sodium oxalate Drugs 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000009279 wet oxidation reaction Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 206010035148 Plague Diseases 0.000 description 1
- 241000607479 Yersinia pestis Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 210000005056 cell body Anatomy 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000005185 salting out Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
- C01F7/46—Purification of aluminium oxide, aluminium hydroxide or aluminates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention discloses a method for removing organic matters in alumina production, which comprises the steps of mixing dust collection ash of boiler combustion coal and fly ash of a gas furnace with low-temperature evaporation mother liquor, then settling, sending sediments to a filter press for filter pressing, sending filter cakes to a red mud storage yard for stockpiling or returning to a boiler for roasting, and returning filter liquor after filter pressing and settling overflow to a production system. The method can reduce the negative influence of organic matters on the production of the aluminum oxide, is beneficial to improving the product quality of the aluminum oxide, has higher product strength and whiteness, reduces the impurity content of the sodium oxide, is beneficial to the filtration and grading operation of the aluminum hydroxide, and relieves the scabbing rate of the decomposer.
Description
Technical Field
The invention relates to the technical field of alumina production, in particular to a method for removing organic matters in alumina production.
Background
In the process of producing alumina by using a Bayer process, organic matters are continuously accumulated to have a plurality of adverse effects on production, and the method mainly comprises the following aspects: 1. the viscosity of the solution is improved, the solution generates foam, the effective volume of the cell bodies such as a decomposing cell and the like is reduced, and the liquid level control of production operation is influenced; 2. the aluminum hydroxide has fine granularity and is fragile, and is easy to break particularly in the calcining process; 3. the solution is colored until blackish brown, and the whiteness of the decomposition product aluminum hydroxide is reduced; 4. sodium oxalate and aluminum hydroxide are crystallized and separated out, the alkali consumption in production is increased, and the impurity content of an aluminum oxide product is increased. 5. Is not beneficial to the sedimentation, filtration and classification of the decomposition product aluminum hydroxide.
The generated organic matters are mainly divided into two categories of humic acid and asphalt. Asphalt is not easy to dissolve in water and is discharged along with red mud during red mud separation and washing. The high molecular organic matter of humic acid generates various sodium humate under the action of alkali and high temperature, and the sodium humate is gradually converted into soluble sodium oxalate and sodium carbonate. With the circulation and accumulation of production, the concentration is gradually increased, and the problems of removing the organic matters and reducing the negative influence of the organic matters on the production are always the problems which plague the production of alumina by a Bayer process. At present, the organic matter removal method mainly comprises a roasting oxidation method, a wet oxidation method, a salting-out method, an ion exchange method and the like. The roasting oxidation method has the defects of high energy consumption, complex process and the like. The wet oxidation process requires severe conditions and has a risk of explosion, which limits the popularization of the process.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method for removing the organic matters in the alumina production can reduce the negative influence of the organic matters on the alumina production, is beneficial to improving the product quality of the alumina, has higher product strength and whiteness, reduces the impurity content of sodium oxide, is beneficial to filtering and grading operation of aluminum hydroxide, and relieves the scabbing rate of a decomposer.
The technical scheme adopted by the invention is as follows: the method is characterized in that dust collecting ash of boiler burning coal and fly ash of a gas furnace are mixed with low-temperature evaporation mother liquor and then are settled, sediment is sent to a filter press for filter pressing, filter cakes are sent to a red mud storage yard for storage or returned to the boiler for roasting, and filter liquor after filter pressing and settlement overflow return to a production system.
Preferably, the temperature of the low-temperature evaporation mother liquor is 60-65 ℃, the alkali concentration is 240g/l, the organic carbon is more than 4g/l, and the oxalate is more than 1 g/l.
Compared with the prior art, the method has the advantages that the waste generated in the production is mixed with the evaporation mother liquor, the organic matters are removed by utilizing the adsorption effect of the carbon in the waste, the removing effect is good, the method is simple, the cost is low, the negative influence of the organic matters on the production of the aluminum oxide can be reduced, the subsequent filtering and grading operation of the aluminum hydroxide is facilitated, and the scabbing rate of the decomposing tank is relieved.
Drawings
FIG. 1 is a process flow diagram of the present invention.
In the figure, 1, a mixing tank, 2, a settling tank, 3, a filter press, 4, a conveyer belt, 5, a filtrate tank, 6 and a conveying pump.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
As shown in figure 1, the method for removing organic matters in alumina production comprises the steps of mixing electric dust collection ash of boiler burning coal and fly ash of a gas furnace with low-temperature evaporation mother liquor, then settling, sending the sediment to a filter press for filter pressing, sending filter cakes to a red mud storage yard for stockpiling or returning to a boiler for roasting, and returning the filtrate after filter pressing and settling overflow to a production system.
When the method is implemented specifically, the low-temperature evaporation mother liquor is the final effluent of multi-effect evaporation, the temperature of the low-temperature evaporation mother liquor is 60-65 ℃, the alkali concentration is 240g/l, the organic carbon is more than 4g/l, and the oxalate radical is more than 1 g/l. The device comprises a mixing tank 1, a conveying pump 6, a settling tank 2, a filter press 3, a conveying belt 4, a filter liquor tank 5 and the like, wherein waste gas generated by coal burning of a boiler is subjected to dust collection through electric dust collection, dust collection ash and fly ash of a gas furnace and low-temperature evaporation mother liquor are uniformly mixed in the mixing tank 1 and then are conveyed to the settling tank 2 through the conveying pump, the settling tank 2 is a conical settling tank, mixed materials are settled and adsorb organic matters in the settling tank 2, the bottom flow of the settling tank 2 is conveyed to the filter press 3 for filter pressing, the settlement overflow of the settling tank 2 is conveyed to the filter liquor tank 5 through the conveying pump 6, filter liquor subjected to filter pressing by the filter press 3 is also conveyed to the filter liquor tank 5, the filter liquor in the filter liquor tank 5 is returned to a production system for recycling, and filter cakes subjected to filter pressing are conveyed to a red mud storage yard through the conveying belt 4 for stockpiling or returned to the boiler for roasting.
The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention should be covered by the present patent.
Claims (2)
1. A method for removing organic matters in alumina production is characterized in that: the method is characterized in that dust collection ash of boiler burning coal and fly ash of a gas furnace are mixed with low-temperature evaporation mother liquor and then are settled, sediment is sent to a filter press for filter pressing, filter cakes are sent to a red mud storage yard for storage or returned to the boiler for roasting, and filter liquor after filter pressing and settlement overflow are returned to a production system.
2. The organic removal method of claim 1, wherein: the temperature of the low-temperature evaporation mother liquor is 60-65 ℃, the alkali concentration is 240g/l, the organic carbon is more than 4g/l, and the oxalate is more than 1 g/l.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110992880.5A CN113929124A (en) | 2021-08-27 | 2021-08-27 | Organic matter removing method for alumina production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110992880.5A CN113929124A (en) | 2021-08-27 | 2021-08-27 | Organic matter removing method for alumina production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113929124A true CN113929124A (en) | 2022-01-14 |
Family
ID=79274658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110992880.5A Pending CN113929124A (en) | 2021-08-27 | 2021-08-27 | Organic matter removing method for alumina production |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113929124A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5728180A (en) * | 1996-06-25 | 1998-03-17 | Aluminum Company Of America | Adsorbent combinations for enhanced removal of sodium oxalate from bayer process spent liquor |
| CN101058433A (en) * | 2007-05-31 | 2007-10-24 | 中国铝业股份有限公司 | Method of purifying organic substance in solution by Bayer method |
-
2021
- 2021-08-27 CN CN202110992880.5A patent/CN113929124A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5728180A (en) * | 1996-06-25 | 1998-03-17 | Aluminum Company Of America | Adsorbent combinations for enhanced removal of sodium oxalate from bayer process spent liquor |
| CN101058433A (en) * | 2007-05-31 | 2007-10-24 | 中国铝业股份有限公司 | Method of purifying organic substance in solution by Bayer method |
Non-Patent Citations (1)
| Title |
|---|
| 环境保护部环境工程评估中心编: "冶金机电类环境影响评价", vol. 1, 中国环境科学出版社, pages: 369 * |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220114 |