CN1974395A - Seed separation granularity controlling method in alumina producing Bayer process - Google Patents
Seed separation granularity controlling method in alumina producing Bayer process Download PDFInfo
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- CN1974395A CN1974395A CN 200610086894 CN200610086894A CN1974395A CN 1974395 A CN1974395 A CN 1974395A CN 200610086894 CN200610086894 CN 200610086894 CN 200610086894 A CN200610086894 A CN 200610086894A CN 1974395 A CN1974395 A CN 1974395A
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- 238000000034 method Methods 0.000 title claims abstract description 73
- 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 30
- 238000004131 Bayer process Methods 0.000 title claims abstract description 21
- 238000000926 separation method Methods 0.000 title claims abstract description 12
- 238000009826 distribution Methods 0.000 claims abstract description 48
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 20
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 239000010419 fine particle Substances 0.000 claims description 47
- 230000008569 process Effects 0.000 claims description 36
- 238000005054 agglomeration Methods 0.000 claims description 31
- 230000002776 aggregation Effects 0.000 claims description 31
- 238000012360 testing method Methods 0.000 claims description 17
- 230000008859 change Effects 0.000 claims description 16
- 239000013078 crystal Substances 0.000 claims description 16
- 238000005516 engineering process Methods 0.000 claims description 16
- 229910021502 aluminium hydroxide Inorganic materials 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims description 10
- 235000013339 cereals Nutrition 0.000 claims description 9
- 239000008187 granular material Substances 0.000 claims description 9
- 230000001276 controlling effect Effects 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 239000000654 additive Substances 0.000 claims description 6
- 230000000996 additive effect Effects 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 5
- 238000005728 strengthening Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 4
- 235000020985 whole grains Nutrition 0.000 claims description 4
- 238000010586 diagram Methods 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 210000000582 semen Anatomy 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 abstract description 11
- 229910001570 bauxite Inorganic materials 0.000 abstract description 2
- 235000019580 granularity Nutrition 0.000 description 33
- 239000002245 particle Substances 0.000 description 19
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 7
- 238000012545 processing Methods 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- 238000005868 electrolysis reaction Methods 0.000 description 3
- 230000000737 periodic effect Effects 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 2
- 230000004087 circulation Effects 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 238000009533 lab test Methods 0.000 description 2
- 230000008520 organization Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 229910001648 diaspore Inorganic materials 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000003921 particle size analysis Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
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- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The present invention relates to production of alumina with bauxite as material, and is especially seed separation granularity controlling method in alumina producing Bayer process. The method includes the screen analysis of aluminum hydroxide of the decomposition system in the decomposition technological condition, the Marwin laser granularity analysis, the Coulter granularity analysis, the establishment of the decomposition technological condition and granularity analysis database, the prediction on system granularity variation trend, and the timely regulation and control of the system parameters to ensure the homogeneous distribution of granularity in the system. The present invention is significant in raising alumina product quality.
Description
Technical field
A kind of seed separation granularity controlling method in alumina producing Bayer process, relating to a kind of bauxite that adopts is the production method of raw material production aluminum oxide.
Background technology
Along with China's aluminium industrial expansion; aluminum electrolysis industry is more and more paid attention to the improvement and the environment protection of working condition; while developing rapidly along with aluminum electrolysis technology; turn to prebake by self-baking; develop into big prebake by little prebake; the application of electrolysis plant Technology of Aluminum Oxide Dense-phase Transport has proposed more strict requirement to the quality of aluminum oxide.Sandy alumina has become the desirable feedstock of current domestic and international electrolytic aluminium factory because of its unique capability and performance.Size-grade distribution is the important indicator of sandy alumina, how to guarantee that Granularity Distribution is bayer process seed process control urgent problem in the scope of reasonably stability.
With the diaspore is that the raw material production of aluminium oxide using Bayer mainly is present in China's aluminum oxide industry, lack sophisticated granularity control technique at present, periodic alligatoring, refinement phenomenon often appear in decomposition of crystal seed system hydroxide particle-size, and the size indicator of alumina product can not guarantee.Plant and divide process initial temperature lower (about 60 ℃); Decomposition contains higher admittedly, and in annual alligatoring, the refinement cycle that occurs more than twice, fluctuating range is bigger, and the cycle is longer.
Some investigators think both at home and abroad, and the periodical change of planting branch process hydroxide particle-size is the result of decomposition course inherent law influence, can only control, slow down its variation tendency by processing condition.In alumina producing Bayer process decomposition of crystal seed process, the periodic alligatoring of system granular, refinement phenomenon have produced very big influence to the stable and alumina product size indicator of decomposing system, cause the difficulty of kind of branch process organization of production and concerned process steps operation.
Summary of the invention
The objective of the invention is the deficiency that in alumina producing Bayer process decomposition of crystal seed process, exists at above prior art, provide a kind of efficiency to overcome the periodic alligatoring of system granular, refinement phenomenon, solve kind of an alumina producing Bayer process granularity control method of dividing process organization of production and concerned process steps operational difficulty problem the stable of decomposing system and influence that the alumina product size indicator produces.
The objective of the invention is to be achieved through the following technical solutions.
A kind of seed separation granularity controlling method in alumina producing Bayer process is characterized in that control process comprises:
A. under certain alumina producing Bayer process kind division technique condition, the screening test result values of the granularity in a plurality of moment of test kind of branch process, with the correspondence Ma Erwen wholegrain degree weight distribution value in the moment, the size distribution value of Ku Erte granularity, set up database, the history curve that curve of grain size changes; Adopt the Ku Erte particle-size analyzer to divide fine particle distribution characteristics figure, peak and percentage composition and the changing trend diagram of setting up, in order to prognoses system change of granularity trend and scope;
B. the alumina producing Bayer process kind is divided in the production process, according to Coulter counter fine particle distribution pattern, eigenwert and Ma Erwen particle-size analyzer-25 μ m fine particle variation tendency and scope, variation in conjunction with sieve size, judge decomposing system hydroxide particle-size variation tendency, kind of a branch process condition is regulated and control.
A kind of seed separation granularity controlling method in alumina producing Bayer process of the present invention is characterized in that it being at seminal fluid Al
2O
3Under the decomposition technique condition of concentration 100～200g/l, α k1.40～1.65,60～80 ℃ of first-cell temperatures of decomposition, first groove seed load 100～600g/l, determine to reach prediction change of granularity trend according to granule number distribution pattern feature and 3.918 μ m peak change that Ku Erte analyzes; Ma Erwen-25 μ m fine particle scope and variation tendency are determined and prediction change of granularity trend; By strengthening the fine particle output balance that the agglomeration control techniques guarantees decomposing system; It is reasonable, steady to guarantee that by cyclone classification crystal seed blending technology seed size distributes; Guarantee the steady control of decomposing system when the concerned process steps unusual fluctuations by additive technology.
A kind of seed separation granularity controlling method in alumina producing Bayer process of the present invention, it is characterized in that it being that control process is according to granularity forecast result, adopt to strengthen agglomeration, the allotment of cyclone classification crystal seed amount is regulated and control decomposition course, guarantee system's aluminium hydroxide+45 μ m ,+balance of each grade size-grade distribution such as 74 μ m.
The present invention influences size-grade distribution equilibrated factor and has carried out going deep on the basis of systematic study in to decomposition course, use fine particle distribution pattern feature and 3.918 μ m peak values that the Coulter counter analyser obtains-45 μ m samples, use the Ma Erwen particle size analyzer and obtain-25 μ m fine particle percentage composition scope and variation tendencies, in conjunction with size test analysis-by-synthesis as a result, accurately prognoses system change of granularity trend and scope.On the basis of advanced prediction, by adjustment to each processing parameter of agglomeration process (agglomeration temperature, agglomeration time, agglomeration process seed load etc.), the rate of decomposition, agglomeration efficient, the solution degree of supersaturation that guarantee agglomeration process are stabilized in the suitable scope, guarantee the fine particle output balance of decomposing system; Guarantee by strengthening the agglomeration control techniques; It is reasonable, steady to guarantee that by cyclone classification crystal seed blending technology seed size distributes; By additive technology guarantee when concerned process steps unusual fluctuations decomposing system steadily.By this a whole set of granularity forecast, balance regulation technology, finally reach the balancing control of decomposing system size-grade distribution and stablizing of product granularity system, obtain the stable alumina product of rational size distribution.
The forecast of table 1 Ma Erwen-25 μ m fine particle granularity
| Ma Erwen fine particle particle size distribution data storehouse | Ma Erwen＜25 μ m content | Prediction fine particle variation tendency |
| Stable | 1.5±0.3％ | Fine particle content is kept stable substantially, and fluctuation range is less |
| The refinement initial stage | 1.5～2％ | Fine particle slowly increases for three days on end, and fine particle content rises to about 2% |
| Refinement mid-term | 2～2.5％ | Adjusting the back fine particle continues to rise to about 2.5% |
| Refinement latter stage | ＞3％ | Fine particle slowly is increased to more than 3% in 2～3 circulations |
| The alligatoring |
3～2％ | Fine particle slowly is reduced near 2% in 3 days continuously |
| Alligatoring mid-term | 2～1.5％ | Continuous 2～3 circulations of fine particle continue to reduce to 2～1.5% |
| Alligatoring latter stage | ＜1.0％ | Adjusting the back fine particle continues to reduce to＜and 1% |
The present invention has stronger industrial exploitativeness, its principal character is to take Ku Erte, Ma Erwen fine particle analytical results that system granular is changed to predict, adopt technology such as strengthening agglomeration control techniques, cyclone classification crystal seed blending technology, additive technology that decomposition course is regulated and control, guarantee the balance of each grade size-grade distribution of system.
Description of drawings
Fig. 1 detects aluminium hydroxide powder particle diameter---granule number particle size distribution figure for 1 Ku Erte particle-size analyzer among the embodiment;
Fig. 2 detects aluminium hydroxide powder particle diameter---granule number particle size distribution figure for the Ku Erte particle-size analyzer among the embodiment 1;
Fig. 3 is the figure that the Ku Erte among the embodiment 2 analyzes;
Fig. 4 is the figure that the Ku Erte among the embodiment 2 analyzes;
Fig. 5 is the figure that the Ku Erte among the embodiment 3 analyzes;
Fig. 6 is the figure that the Ku Erte among the embodiment 3 analyzes;
Fig. 7 is the figure that the Ku Erte among the embodiment 4 analyzes;
Fig. 8 is the figure that the Ku Erte among the embodiment 4 analyzes;
Fig. 9 is-45 μ m sample Ku Erte analytical results granularities forecast under the relative fluctuation status.
Embodiment
A kind of seed separation granularity controlling method in alumina producing Bayer process, its control process comprises: a. is under certain alumina producing Bayer process kind division technique condition, the screening test result values of the granularity in a plurality of moment of test kind of branch process, with the correspondence Ma Erwen wholegrain degree weight distribution value in the moment, the size distribution value of Ku Erte granularity, set up database, the history curve that curve of grain size changes; Adopt the Ku Erte particle-size analyzer to divide fine particle distribution characteristics figure, peak and percentage composition and the changing trend diagram of setting up, in order to prognoses system change of granularity trend and scope; B. the alumina producing Bayer process kind is divided in the production process, according to Coulter counter fine particle distribution pattern, eigenwert and Ma Erwen particle-size analyzer-25 μ m fine particle variation tendency and scope, variation in conjunction with sieve size, judge decomposing system hydroxide particle-size variation tendency, kind of a branch process condition is regulated and control.
Process of the present invention is at seminal fluid Al
2O
3Concentration 100～200g/l, α
k1.40～1.65, decompose under the decomposition technique condition of 60～80 ℃ of first-cell temperatures, first groove seed load 100～600g/l, determine to reach prediction change of granularity trend according to granule number distribution pattern feature and 3.918 μ m peak change that Ku Erte analyzes; Ma Erwen-25 μ m fine particle scope and variation tendency are determined and prediction change of granularity trend; By strengthening the fine particle output balance that the agglomeration control techniques guarantees decomposing system; It is reasonable, steady to guarantee that by cyclone classification crystal seed blending technology seed size distributes; Guarantee the steady control of decomposing system when the concerned process steps unusual fluctuations by additive technology.Control process is according to granularity forecast result, adopt strengthen agglomeration, the allotment of cyclone classification crystal seed amount is regulated and control decomposition course, guarantee system's aluminium hydroxide+45 μ m ,+balance of each grade size-grade distribution such as 74 μ m.
By laboratory test, expanding test and pilot-plant test research, obtained bayer process seed hydroxide particle-size distribution equilibrium control technique, and on industrial production, used, instruct industrial production to regulate and control, successfully produce qualified sandy alumina product.
In the process of the test,, formulate sample time, anatomize the system data rule, truly reflect the variable effect rule of the adjustment of process system system granular by the scientific and reasonable sampling spot of choosing.In the test, mainly chosen the first groove of agglomeration, the first groove of growing up, decompose last groove, five important sampling spots of product and crystal seed, in strict accordance with sampling requirement rule and sample time, sampling every day once, taking-up can reflect the sample of actual grain size, through filtering, oven dry is handled, analyze+150 μ m by vanning jig, + 75 μ m, + 44 μ m, the content of each grade,, the particle content of a plurality of size fractionated of employing Ma Erwen laser particle size detailed analysis, adopt the Ku Erte analyser to analyze the fine grain number of the following sample of-44 μ m, the granularity data that each instrumental analysis is come out is depicted as the graphic representation form at last, is convenient to observe, analyze and the summary rule, reach the variation tendency of accurate judgement system granular.
Its innovation point is to obtain the graphic feature that fine particle distributes by Ku Erte, Ma Erwen laser particle size analysis, and then in conjunction with the sieve size variation variation tendency and degree that system granular distributes is made prediction accurately; On accurate base of prediction, follow the principle of leading, single factor, fine tune agglomeration process, classification process are carried out the adjustment of timely and appropriate discovery, adopt additive in the time of necessary, guarantee that system granular is distributed in the reasonable range inner equilibrium and stablizes.
By tackling key problem research, grasped a whole set of size-grade distribution equilibrated control technique, make the granularity of decomposition course and distribute to be controlled at also to keep stable in certain scope.Set up and expand examination and half industrial sreen analysis database, the history curve of curve of grain size changes in distribution.Determine whether that according to the Comprehensive analysis results of the size distribution report of the history curve of change of granularity and the size test result on the same day, Ma Erwen wholegrain degree weight distribution measurement result, Ku Erte-45 μ m granularity and relevant technologies needs regulate and control, regulate and control which parameter, the direction that should regulate and control and dynamics.
To the basis of pilot-plant test, we develop a cover control bayer process seed process size-grade distribution equilibrated control technique in laboratory test, expanding test.Guarantee that from the modulation process condition system granular equilibrated angle considers, we think in granularity comparatively stably in the process, mainly tackle temperature schedule and the crystal seed hierarchy system is finely tuned, and other processing condition are answered kept stable.To the control of agglomeration process,, also be to optimize the critical process that hydroxide particle-size distributes because agglomeration process is the critical period that the aluminum hydroxide particles crystalline structure forms.By adjust agglomeration section temperature, contain admittedly, time, and parameter such as seed size distribution, control agglomeration efficient guarantees the distribution of system granular.In the working control process, contain admittedly and the seed size distribution situation, adjust agglomeration temperature and agglomeration time, make system granular reach stable according to the first groove of agglomeration.The addition of crystal seed, the size-grade distribution of crystal seed are to the granularity balance important influence of system.By the adjustment of hierarchy system fractional efficiency, the size-grade distribution of control crystal seed, the reasonableness that the assurance seed size distributes and relatively stable drives system-wide grade and distributes near predetermined target, and size-grade distribution reaches requirement and keeps stable in the assurance decomposing system.
Embodiment 1
The Ku Erte particle-size analyzer can detect the granule number of aluminium hydroxide powder different-grain diameter, i.e. particle diameter---and granule number particle size distribution figure (Fig. 1, Fig. 2), we are referred to as the graphic feature of Ku Erte sreen analysis.The detectable smallest particles particle diameter of Ku Erte particle-size analyzer is 3.918 μ m.The Ma Erwen particle-size analyzer can detect the percent by volume of aluminium hydroxide powder different-grain diameter.
Graphic feature from the Ku Erte analysis, within a short period of time (2～3 days), aluminium hydroxide fine particle quantity increases considerably (from accompanying drawing 1 → 2) in the system, the particle median size is reduced to about 15 μ m, 3.918 fine particle distributes more relatively near the μ m, Ma Erwen-25 μ m fine particle for three days on end slowly increases, when fine particle content rises to 2% left and right sides, can judge that the system granular distribution enters the refinement initial stage, take this moment the agglomeration temperature to raise 1 ℃, seed load suitably increases, agglomeration time proper extension, the first groove of growing up raises 0.5 ℃ and waits measure, can change at 5～7 angel's decomposing system fine particles to be tending towards normal, avoids system granular fluctuation to occur.
Embodiment 2
The graphic feature of analyzing as Ku Erte is shown in accompanying drawing 3,4, the peak value that fine particle distributes is at 40～60 μ m, the particle median size is at 30 μ m～40 μ m, 3.918 it is considerably less that μ m place fine particle distributes, its numerical value drops to about 200, minuteness particle content is very low in system's aluminium hydroxide, and minuteness particle content further reduces, and the peak value of graphical distribution continues to move to right; Ma Erwen-25 μ m fine particle for three days on end slowly increases,-15 μ m fine particle content drop to 0, can judge that system granular distributes enters refinement latter stage, take this moment the agglomeration temperature to reduce by 0.5 ℃, the first groove of growing up reduces by 0.5 ℃ and waits measure, can be tending towards normal in the variation of 5～7 angel's decomposing system fine particles, avoid sieve size to occur than great fluctuation process.
Graphic feature from the Ku Erte analysis, the particle median size drops to below the 20 μ m, within a short period of time (2～3 days), aluminium hydroxide fine particle quantity increases considerably (from accompanying drawing 5 → 6) in the system, 3.918 μ m place particle numerical value continues to be elevated to more than 5000～10000, than the crest disappearance at coarse fraction place; Ma Erwen-25 μ m fine particle slowly is reduced to about 1% for three days on end,-2.5 μ m fine particle content are about 0.5%, can judge that system granular distributes enters alligatoring latter stage, take this moment the agglomeration temperature to raise 0.5 ℃, the first groove of growing up raises 0.5 ℃ and waits measure, can be tending towards normal in the variation of 5～7 angel's decomposing system fine particles, avoid sieve size to occur than great fluctuation process.
Embodiment 4
When graphic feature such as accompanying drawing 7,8 that Ku Erte analyzes, L-shaped substantially, 3.918 μ m granule number fluctuation ranges are between 2000～5000; Ma Erwen-25 μ m fine particle stable content is 1.5 ± 0.3%, can judge that the system granular distribution is in plateau substantially, this moment is according to 3.918 μ m granule numbers and Ma Erwen-25 μ m fine particle content fluctuation situation, first groove agglomeration temperature is carried out suitable fine setting, can avoid sieve size to occur, keep the relatively stable of kind of sub-system granularity than great fluctuation process.
Embodiment 5
At flow is on the test wire of 10L/h, 70～80 ℃ of first temperature of separation, seed load 200～500g/l, agglomeration time 2～8h, 56～65 ℃ of the first temperature of growing up, resolving time 40～70h, processing condition under, use size-grade distribution of the present invention forecast and control technique, system's hydroxide particle-size is in 5 months time, + 45 μ m are stabilized in 85～90%, and+74 μ m are stabilized in 60～65% the scope, and the product aluminum oxide grain size is stabilized in the level of-45 μ m＜10%.
Embodiment 6
At flow is 10m
3On the test wire of/h, 65～75 ℃ of first temperature of separation, seed load 300～600g/l, agglomeration time 4～10h, 54～62 ℃ of the first temperature of growing up, resolving time 40～70h, processing condition under, use size-grade distribution of the present invention forecast and control technique, system's hydroxide particle-size is in 5 months time, + 45 μ m are stabilized in 87～94%, and+74 μ m are stabilized in 55～65% the scope, and the product aluminum oxide grain size is stabilized in the level of-45 μ m＜10%.
Embodiment 7
At flow is 600m
3On the test wire of/h, 65～80 ℃ of first temperature of separation, seed load 100～500g/l, agglomeration time 4～12h, 54～65 ℃ of the first temperature of growing up, resolving time 40～70h, processing condition under, use size-grade distribution of the present invention forecast and control technique, system's hydroxide particle-size is in 3 months time, + 45 μ m are stabilized in 80～88%, and+74 μ m are stabilized in 30～40% the scope, and the product aluminum oxide grain size is stabilized in the level of-45 μ m＜12%.
Claims (3)
1. seed separation granularity controlling method in alumina producing Bayer process is characterized in that control process comprises:
A. under certain alumina producing Bayer process kind division technique condition, the screening test result values of the granularity in a plurality of moment of test kind of branch process, with the correspondence Ma Erwen wholegrain degree weight distribution value in the moment, the size distribution value of Ku Erte granularity, set up database, the history curve that curve of grain size changes; Adopt the Ku Erte particle-size analyzer to divide fine particle distribution characteristics figure, peak and percentage composition and the changing trend diagram of setting up, in order to prognoses system change of granularity trend and scope;
B. the alumina producing Bayer process kind is divided in the production process, according to Coulter counter fine particle distribution pattern, eigenwert and Ma Erwen particle-size analyzer-25 μ m fine particle variation tendency and scope, variation in conjunction with sieve size, judge decomposing system hydroxide particle-size variation tendency, kind of a branch process condition is regulated and control.
2. method according to claim 1 is characterized in that it being at seminal fluid Al
2O
3Concentration 100～200g/l, α
k1.40～1.65, granule number distribution pattern feature of analyzing according to Ku Erte under the decomposition technique condition of 60～80 ℃ of first-cell temperatures of decomposition, first groove seed load 100～600g/l and 3.918 μ m peak change determine to reach prediction change of granularity trend; Ma Erwen-25 μ m fine particle scope and variation tendency are determined and prediction change of granularity trend; By strengthening the fine particle output balance that the agglomeration control techniques guarantees decomposing system; It is reasonable, steady to guarantee that by cyclone classification crystal seed blending technology seed size distributes; Guarantee the steady control of decomposing system when the concerned process steps unusual fluctuations by additive technology.
3. method according to claim 1, it is characterized in that it being that control process is according to granularity forecast result, adopt to strengthen agglomeration, the allotment of cyclone classification crystal seed amount is regulated and control decomposition course, guarantee system's aluminium hydroxide+45 μ m ,+balance of each grade size-grade distribution such as 74 μ m.
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| CN 200610086894 CN1974395A (en) | 2005-06-23 | 2006-06-22 | Seed separation granularity controlling method in alumina producing Bayer process |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102070167A (en) * | 2010-12-15 | 2011-05-25 | 中国铝业股份有限公司 | Production method of monocrystalline aluminum hydroxide |
| CN109650420A (en) * | 2019-02-16 | 2019-04-19 | 中铝矿业有限公司 | The method of one section of bayer process seed production sandy alumina |
| CN114368768A (en) * | 2020-10-15 | 2022-04-19 | 中铝国际工程股份有限公司 | Aluminum hydroxide crystal seed granularity refinement explosion prediction model and method based on LSTM |
-
2006
- 2006-06-22 CN CN 200610086894 patent/CN1974395A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102070167A (en) * | 2010-12-15 | 2011-05-25 | 中国铝业股份有限公司 | Production method of monocrystalline aluminum hydroxide |
| CN102070167B (en) * | 2010-12-15 | 2012-11-07 | 中国铝业股份有限公司 | Production method of monocrystalline aluminum hydroxide |
| CN109650420A (en) * | 2019-02-16 | 2019-04-19 | 中铝矿业有限公司 | The method of one section of bayer process seed production sandy alumina |
| CN114368768A (en) * | 2020-10-15 | 2022-04-19 | 中铝国际工程股份有限公司 | Aluminum hydroxide crystal seed granularity refinement explosion prediction model and method based on LSTM |
| CN114368768B (en) * | 2020-10-15 | 2023-10-24 | 中铝国际工程股份有限公司 | LSTM-based aluminum hydroxide seed crystal granularity refinement burst prediction model and method |
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