CN102259903B - Method for reducing content of sodium carbonate in alumina Bayer process solution - Google Patents
Method for reducing content of sodium carbonate in alumina Bayer process solution Download PDFInfo
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- CN102259903B CN102259903B CN 201110164742 CN201110164742A CN102259903B CN 102259903 B CN102259903 B CN 102259903B CN 201110164742 CN201110164742 CN 201110164742 CN 201110164742 A CN201110164742 A CN 201110164742A CN 102259903 B CN102259903 B CN 102259903B
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- bayer
- sodium carbonate
- causticization
- alumina
- red mud
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- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 title claims abstract description 92
- 238000000034 method Methods 0.000 title claims abstract description 63
- 229910000029 sodium carbonate Inorganic materials 0.000 title claims abstract description 42
- 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 28
- 238000004131 Bayer process Methods 0.000 title claims abstract description 27
- 239000006210 lotion Substances 0.000 claims abstract description 27
- 230000008569 process Effects 0.000 claims description 40
- 238000005406 washing Methods 0.000 claims description 40
- 238000009993 causticizing Methods 0.000 claims description 19
- 238000001556 precipitation Methods 0.000 claims description 19
- 238000002425 crystallisation Methods 0.000 claims description 14
- 230000008025 crystallization Effects 0.000 claims description 14
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 239000000920 calcium hydroxide Substances 0.000 claims description 6
- 235000011116 calcium hydroxide Nutrition 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 239000006200 vaporizer Substances 0.000 claims description 6
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 238000001704 evaporation Methods 0.000 abstract description 4
- 238000007599 discharging Methods 0.000 abstract description 3
- 238000004062 sedimentation Methods 0.000 abstract description 2
- 230000001376 precipitating effect Effects 0.000 abstract 2
- 238000001914 filtration Methods 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
- 150000003839 salts Chemical class 0.000 description 9
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 239000003513 alkali Substances 0.000 description 4
- 239000000706 filtrate Substances 0.000 description 4
- 238000005245 sintering Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 3
- 230000008016 vaporization Effects 0.000 description 3
- 239000003518 caustics Substances 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 235000011089 carbon dioxide Nutrition 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 239000008236 heating water Substances 0.000 description 1
- 239000011504 laterite Substances 0.000 description 1
- 229910001710 laterite Inorganic materials 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 229910001388 sodium aluminate Inorganic materials 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
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- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method for reducing content of sodium carbonate in alumina Bayer process solution, which comprises the steps of: discontinuously evaporating Bayer spent liquor for crystallizing and precipitating sodium carbonate from the Bayer spent liquor; discharging the crystallized sodium carbonate from the Bayer spent liquor by sedimentation, separation and filtration methods; and discharging the sodium carbonate from lotion by continuous causticization of Bayer red mud lotion. According to the method provided by the invention, the content of the sodium carbonate in the alumina Bayer process solution is obviously reduced; driving frequency and running time of the procedures of crystallizing and precipitating the sodium carbonate are largely reduced; the running cost is reduced; simultaneously, the operating condition of the causticization procedure is improved; and the loss of causticizating alumina is reduced.
Description
Technical field
The present invention relates to the aluminum oxide field of metallurgy, particularly a kind of method that reduces content of sodium carbonate in alumina Bayer process solution.
Background technology
At present, generally adopt Bayer process or Bayer and sintering producing alumina by mixed combined process both at home and abroad.No matter be pure Bayer process or the process of producing alumina by mixed combined process, caustic alkali in the Bayer flow process all can generate sodium carbonate with carbonate effect in process in leaching, simultaneously, sodium aluminate solution also can absorb airborne carbonic acid gas and generate sodium carbonate, often carry out a Bayer circulation, nearly 3% caustic alkali becomes sodium carbonate.These sodium carbonate are not removed and will be accumulated, and cause Bayer flow process alkali cycle efficiency to descend, and affect the vaporization efficiency of digester result of extraction and vaporizer, and in production of alumina by mixture combination process, the carbonate content of Bayer flow process solution are higher.Therefore, in reduction Bayer flow process solution, carbonate content is one of approach that reduces the alumina producing Bayer process cost.
The method of the reduction content of sodium carbonate in alumina Bayer process solution that generally uses at present, has in red mud causticization, washing lotion causticization and evaporative process the methods such as solid monohydrated sodium carbonate causticization.Red mud causticization and washing lotion causticization process flow operation expense are low but take effect slowly, and what of the height of causticizing efficiency and alumina loss what of milk of lime add-on directly have influence on, so independent operating carbon is severe than controlling the large and DeGrain of difficulty; Solid monohydrated sodium carbonate causticization is analysed salt by the vaporizer crystallization and is removed sodium carbonate, and independent execution time is long, and working cost is high.Therefore, the outbalance that in more effective removal Bayer flow process solution, the problem of sodium carbonate shows and urgent.
Summary of the invention
One of purpose of the present invention is to provide and a kind ofly reduces driving number of times and the working time that the salt flow process is analysed in crystallization, reduces the method for the reduction content of sodium carbonate in alumina Bayer process solution of causticization alumina loss.
According to an aspect of the present invention, provide a kind of method that reduces content of sodium carbonate in alumina Bayer process solution to comprise:
Interruption is evaporated the Bayer seed precipitation solution, makes sodium carbonate crystallization from the Bayer seed precipitation solution;
By method settlement separate and that filter, described sal soda is discharged from described Bayer seed precipitation solution;
By the continuous causticizing to the Bayer red mud washing lotion, the sodium carbonate in washing lotion is discharged.
Wherein, described interruption is evaporated to the Bayer seed precipitation solution: by following by force the vaporizer intermitten service, the Bayer seed precipitation solution is evaporated;
Described mode of described sal soda being discharged by method settlement separate and that filter is: utilize subsider settlement separate, then filter by filter sal soda is discharged the Bayer process flow process;
Described by the continuous causticizing to the Bayer red mud washing lotion, the discharge of the sodium carbonate in washing lotion is comprised: three washing lotions of red mud are introduced the causticizing reaction grooves, and add milk of lime and carry out causticization; Regulate the severe ratio of carbon and control causticizing efficiency and alumina loss rate, after causticization is completed, causticization liquid is sent back to washing system, sodium carbonate generates precipitation of calcium carbonate by causticizing reaction and discharges the Bayer process flow process with red mud.
Greatly reduce according to the method for reduction content of sodium carbonate in alumina Bayer process solution provided by the invention driving number of times and the working time that the salt flow process is analysed in crystallization, reduce working cost, simultaneously, improve causticization flow operations condition, reduce the causticization alumina loss.
Description of drawings
Fig. 1 is the schematic flow sheet that the salt flow process is analysed in crystallization that the embodiment of the present invention provides;
Fig. 2 is the schematic flow sheet of the washing lotion causticization that provides of the embodiment of the present invention;
The object of the invention, function and advantage are described further with reference to accompanying drawing in connection with embodiment.
Embodiment
A kind of method that reduces content of sodium carbonate in alumina Bayer process solution that the embodiment of the present invention provides comprises:
As shown in Figure 1, step 10, by following by force the vaporizer intermitten service is evaporated the Bayer seed precipitation solution, makes sodium carbonate crystallization from the Bayer seed precipitation solution.
Step 20, by method settlement separate and that filter, sal soda is discharged from the Bayer seed precipitation solution.Specifically: it is settlement separate that the Bayer seed precipitation solution after evaporation carries out crystallization by subsider.Wherein, the subsider overflow is directly sent into make-up tank and is recycled in the alumina producing Bayer process process as planting a minute mother liquid evaporation.The subsider underflow filters through filter, and filtrate is sent into filtrate receiver.Filter filtrate is sent into and is directly sent into make-up tank after filtrate receiver and recycle in the alumina producing Bayer process process as planting a minute mother liquid evaporation.Filter cake is sent into the underflow tempering tank and is then allocated sintering process alkali lye into and send together sintering process batching to use.
Step 30, by to the continuous causticizing of Bayer red mud washing lotion, the sodium carbonate in washing lotion is discharged.
As shown in Figure 2, the Bayer process red mud washing is six washings, i.e. six washing settling groove series connection washings.Wherein, the rinse bath overflow is called washing lotion, is primary wash liquor as the overflow at the once washing groove.Washing process is backflush, and namely the underflow red mud flows to secondary, three times, four times, five times and No. six rinse baths successively from the once washing groove.And washing lotion flows to five times, four times, three times, secondary and once washing groove successively from No. six rinse baths, wherein needs heating water in No. six rinse baths.the causticization flow process is that three washing lotions in the laterite washing process (namely No. three rinse bath overflows) are introduced the causticizing reaction groove, then add milk of lime and carry out causticizing reaction in the causticizing reaction groove, severe than controlling causticizing efficiency and alumina loss rate by regulating carbon, in reaction process, sodium carbonate and milk of lime effect generate precipitation of calcium carbonate, after reaction is completed, the causticization slurries are squeezed into the secondary washing groove, utilize like this secondary washing groove, the precipitation of calcium carbonate that causticization generates is flowed into three times by the secondary washing groove successively by underflow together with red mud, four times, five times until No. six rinse baths then discharge from flow process.
The method of the reduction content of sodium carbonate in alumina Bayer process solution that the embodiment of the present invention provides, select vaporizing raw liquor and three washing lotions of Bayer process respectively as point of penetration, the first is evaporated to vaporizing raw liquor and requires concentration by following by force vaporizer, make most of crystallize sodium carbonate separate out, then utilize subsider settlement separate, then filter by filter sal soda is discharged the Bayer process flow process, the sodium carbonate of discharge can be sent to the sintering process batching, also can be used as raw material and seeks other purposes; It two is that three washing lotions of red mud are introduced causticizing tanks, add milk of lime and carry out causticization, regulate the severe ratio of carbon and control causticizing efficiency and alumina loss, after causticization is completed, causticization liquid is sent back to washing system, sodium carbonate generates precipitation of calcium carbonate by causticizing reaction and discharges the Bayer process flow process with red mud.Two covers are before flow processs are combined with, need to calculate crystallization and analyse the salt cycle of operation and each time of driving according to how much the assessing of carbonate content in Bayer process alumina producing scale and Bayer process flow process solution, and the operational condition of definite causticization flow process.
Crystallization is analysed salt and washing lotion causticization " one be interrupted, one continuous " in conjunction with practical technique effect major embodiment:
(1) the flow process point of penetration is improved to 2 incisions by common some incision, can more effectively reduce the carbonate content in Bayer flow process solution.Most of sodium carbonate is analysed the salt crystallization by crystallization, and then sedimentation is filtered and removed, and small part sodium carbonate is by discharging outside flow process with red mud after the washing lotion causticization.Remove sodium carbonate because of 2 incisions, adding the washing lotion causticization is continuous operational scheme, can more effective quick removal flow process sodium carbonate, and make the carbonate content in Bayer flow process solution maintain lower and stable state.
(2) salt and washing lotion causticization " one be interrupted, one continuous " operation is analysed in crystallization, compares with the independent operating flow process, can reduce process flow operation expense 25%, simultaneously, can improve operational condition.The causticization flow process is moved continuously, can reduce the time that salt driving number of times and each run are analysed in crystallization, reduces running cost, has also avoided the operation of causticization flow-independent to take effect and has not even had slowly resultful drawback.Simultaneously, improve the control condition of washing lotion causticization flow process, by regulating the severe ratio of carbon, can effectively reduce alumina loss.
Above-described embodiment is the better embodiment of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under spirit of the present invention and principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, within being included in protection scope of the present invention.
Claims (3)
1. a method that reduces content of sodium carbonate in alumina Bayer process solution, is characterized in that, comprising:
Interruption is evaporated the Bayer seed precipitation solution, makes sodium carbonate crystallization from the Bayer seed precipitation solution; It is by following by force the vaporizer intermitten service, the Bayer seed precipitation solution being evaporated that described interruption is evaporated the Bayer seed precipitation solution;
By method settlement separate and that filter, sal soda is discharged from described Bayer seed precipitation solution;
By the continuous causticizing to the Bayer red mud washing lotion, the sodium carbonate in washing lotion is discharged.
2. method according to claim 1, is characterized in that, described described sal soda the discharge by method settlement separate and that filter is:
Utilize subsider settlement separate, then filter by filter sal soda is discharged the Bayer process flow process.
3. method according to claim 1, is characterized in that, and is described by the continuous causticizing to the Bayer red mud washing lotion, the sodium carbonate in washing lotion discharged comprise:
Three washing lotions of red mud are introduced the causticizing reaction groove, and add milk of lime and carry out causticization;
Regulate the severe ratio of carbon and control causticizing efficiency and alumina loss rate, after causticization is completed, causticization liquid is sent back to washing system, sodium carbonate generates precipitation of calcium carbonate by causticizing reaction and discharges the Bayer process flow process with red mud.
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| CN103553371A (en) * | 2013-11-15 | 2014-02-05 | 中国铝业股份有限公司 | Method for preparing lime milk in alkaline process aluminium oxide production |
| CN105016365A (en) * | 2015-07-24 | 2015-11-04 | 中国铝业股份有限公司 | Salt discharging system and method in Bayer-process aluminium oxide production process |
| CN111252790B (en) * | 2020-03-16 | 2022-05-13 | 中国铝业股份有限公司 | Improved method for evaporation and salting-out process of Bayer process high-carbon alkali solution |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101734694A (en) * | 2008-11-17 | 2010-06-16 | 贵阳铝镁设计研究院 | Method for excluding sodium oxalate and carbonate from Bayer process solution by adopting ultra-concentration method |
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| FR2870535B1 (en) * | 2004-05-18 | 2007-02-16 | Aluminium Pechiney Soc Par Act | IMPROVEMENT TO THE BAYER PROCESS FOR THE PRODUCTION OF ALUMINA TRIHYDRATE BY ALKALINE CONTAMINATION OF BAUXITE, THIS METHOD COMPRISING A PRE-ASSESSMENT STEP |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101734694A (en) * | 2008-11-17 | 2010-06-16 | 贵阳铝镁设计研究院 | Method for excluding sodium oxalate and carbonate from Bayer process solution by adopting ultra-concentration method |
Non-Patent Citations (4)
| Title |
|---|
| 丁安平 等.山西铝厂拜尔法系统碳酸钠的危害及排除措施.《有色冶炼》.2000,第29卷(第5期),10-14. |
| 减少高压溶出机组碳酸钠结晶及处理方法;闫续房 等;《有色矿冶》;20040430;第20卷(第2期);29-30 * |
| 山西铝厂拜尔法系统碳酸钠的危害及排除措施;丁安平 等;《有色冶炼》;20001031;第29卷(第5期);10-14 * |
| 闫续房 等.减少高压溶出机组碳酸钠结晶及处理方法.《有色矿冶》.2004,第20卷(第2期),29-30. |
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Effective date of registration: 20160531 Address after: Nam Dinh Town, Zhangdian city of Zibo province Shandong 255051 five km road No. 1 Patentee after: China Aluminum Shandong Co., Ltd. Address before: 100082 Beijing, Xizhimen, North Street, No. 62, No. Patentee before: Aluminum Corporation of China Limited |