CN1911808A - Method for decomposing ultrahigh concentration sodium aluminate solution - Google Patents
Method for decomposing ultrahigh concentration sodium aluminate solution Download PDFInfo
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- CN1911808A CN1911808A CN 200610127318 CN200610127318A CN1911808A CN 1911808 A CN1911808 A CN 1911808A CN 200610127318 CN200610127318 CN 200610127318 CN 200610127318 A CN200610127318 A CN 200610127318A CN 1911808 A CN1911808 A CN 1911808A
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- decomposition
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- sodium aluminate
- aluminate solution
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Abstract
The super high concentration sodium aluminate solution decomposing process as one technological process of producing alumina with diasporic bauxite features the technological conditions including first decomposing temperature of 70-80 deg.c, final temperature of 45-55 deg.c, crystal seed adding amount of 2-3 times the Al2O3 weight in the raw liquid. The present invention has decomposition of process temperature lowering gradient, control of crystal seed adding amount, addition of organic additive to raise decomposing rate, addition of active crystal seed to raise decomposing rate and optimized grain size and its distribution, so as to result in decomposing rate not lower than 46 %, high alumina yield up to 140 kg/L, fine product grain size, greatly lowered concentration difference between the decomposed mother liquid and circulating alkali liquid and lowered power consumption.
Description
Technical field
The method that a kind of ultrahigh concentration sodium aluminate solution decomposes relates to the processing method that a kind of diaspore type bauxite is produced aluminum oxide.
Technical background
China's aluminum oxide industry process and technology innovation is a target to improve output capacity and to save energy and reduce the cost all the time, the concentration that sodium aluminate decomposes stoste improves constantly, from about the caustic alkali 135g/l of the eighties in 20th century, bring up to 160 present～170g/l, the actual rate of decomposition of industrial production does not still have research and decompose greater than the sodium aluminate solution of 200g/l for caustic sodium concentration about 48%.Caustic sodium concentration greater than 200g/l after, its alumina concentration sharply increases from physical and chemical principle analytical solution viscosity up to more than the 220g/l, decomposes difficulty.But diaspore type bauxite is produced aluminum oxide will shorten the aluminum oxide flow process, energy-saving and cost-reducing, very difficult from strengthening stripping, and decomposes from reinforcing sodium aluminate solution, realizes that ultrahigh concentration sodium aluminate solution decomposes deep decomposition using value is arranged.
Summary of the invention
The invention provides a kind of ultrahigh concentration (N
k〉=190g/l) the sodium aluminate solution method of decomposing is intended to solve ultrahigh concentration sodium aluminate solution and decomposes difficulty, rate of decomposition is low and product granularity is thin problem.
Method of the present invention is achieved through the following technical solutions.
The method that a kind of ultrahigh concentration sodium aluminate solution decomposes is characterized in that and will release souls from purgatory concentration N
kBe that the processing condition that 190～220g/l sodium aluminate solution decomposes are: first temperature of separation is 70～80 ℃, and last temperature is 45～55 ℃; Seed load is with Al
2O
3Al in meter and the decomposition stoste
2O
3Weight ratio be 2～3.
The method that a kind of ultrahigh concentration sodium aluminate solution of the present invention decomposes is characterized in that the crystal seed that adds is to use N
kThe high density decomposition nut liquid of 〉=190g/l is at the activation crystal seed of handling 1～3 hour more than 50 ℃.
The method that a kind of ultrahigh concentration sodium aluminate solution of the present invention decomposes is characterized in that adding in the decomposition course polyacrylamide to improve rate of decomposition, and addition is 50～150ppm/l, and addition manner adds before being-is dissolved in the decomposition stoste of not adding crystal seed.
Method of the present invention is fully decomposed at comparatively high temps by optimizing the decomposition temperature system; By controlling suitable seed load, not only improve rate of decomposition but also optimize product granularity and add the polyacrylamide tensio-active agent, reduce soltion viscosity to improve rate of decomposition; By adopting the thin crystal seed of high density mother liquor activatory to improve rate of decomposition.
Decomposing the dense N of stoste
k〉=190g/l makes hydroxide particle-size-45 μ m≤12% of rate of decomposition 〉=50%, output.
Method of the present invention is applicable to concentration N
kBayer's process at 190～220g/l decomposes stoste.Method of the present invention is decomposed output capacity and cycle efficiency for improving Bayer process, realizes bayer's process system high efficiencyization and energy-saving and cost-reducing significant, has the prospect in integrated process and bayer's process alumina producer wide popularization and application.
The present invention adopts decomposition course cooling gradient, and the control seed load adds the organic additive that improves rate of decomposition, adds active seed and improves rate of decomposition, optimizes the method for granularity and distribution thereof, is decomposing the dense N of stoste
kAt 190～220g/l, the hydroxide particle-size of rate of decomposition 〉=46%, output-45 μ m≤12% makes aluminum oxide decompose output capacity by existing 70kg/m
3Bring up to more than the 140kg/l, and reduced the concentration difference of decomposition nut liquid and circulation alkali liquor significantly, can make bayer's process system process energy consumption reduce more than 15%.
Concrete embodiment
The method that a kind of ultrahigh concentration sodium aluminate solution decomposes will release souls from purgatory concentration N
kBe that the processing condition that 190～220g/l sodium aluminate solution decomposes are: first temperature of separation is 70～80 ℃, and last temperature is 45～55 ℃; Seed load is with Al
2O
3Al in meter and the decomposition stoste
2O
3Weight ratio be 2～3.Add polyacrylamide for improving rate of decomposition in the decomposition course, addition is 50～150ppm/l, and addition manner adds before being-is dissolved in the decomposition stoste of not adding crystal seed.The crystal seed that adds is to use N
kThe high density decomposition nut liquid of 〉=190g/l is at the activation crystal seed of handling 1～3 hour more than 50 ℃.
Below in conjunction with example method of the present invention is further described.
Embodiment 1
N with 50 ℃
kThe high density decomposition nut liquid crystal seed of 〉=190g/l 3 hours obtains active seed; With caustic sodium concentration (N
k) be cooled to 75 ℃ greater than the bayer's process seminal fluid of 220g/l, be mixed into the first groove of decomposition with the activation crystal seed, and the ratio of controlling aluminum oxide in first groove crystal seed (in aluminum oxide) and the solution is 2.5, through decomposing 36 hours, temperature is reduced to 60 ℃, change the cooling gradient then, reduced to 48 ℃ from 70 ℃ through 48 hours, end groove discharging classification, the thin crystal seed that classifier overflow obtains after filtering mixes stir process and returned first groove in 2.5 hours with decomposition nut liquid, the grading machine underflow after filtration, promptly obtain granularity-45 μ m after the washing and be 7.0% aluminium hydroxide product, rate of decomposition at that time reaches 46.6%.
Embodiment 2
With caustic sodium concentration (N
k) be cooled to 80 ℃ greater than the bayer's process seminal fluid of 210g/l, be mixed into the first groove of decomposition with the activation crystal seed, and the ratio of controlling aluminum oxide in first groove crystal seed (in aluminum oxide) and the solution is 3.0, through decomposing 30 hours, temperature is reduced to 65 ℃, change the cooling gradient then, reduced to 46 ℃ from 65 ℃ through 54 hours, end groove discharging classification, the thin crystal seed that classifier overflow obtains after filtering mixes stir process and returned first groove in 3 hours with decomposition nut liquid, the grading machine underflow after filtration, promptly obtain granularity-45 μ m after the washing and be 8.9% aluminium hydroxide product, rate of decomposition at that time reaches 50.6%.
Embodiment 3
With caustic sodium concentration (N
k) be cooled to 75 ℃ greater than the bayer's process seminal fluid of 200g/l, be mixed into the first groove of decomposition with the activation crystal seed, and the ratio of controlling aluminum oxide in first groove crystal seed (in aluminum oxide) and the solution is 2.0, through decomposing 30 hours, temperature is reduced to 60 ℃, change the cooling gradient then, reduced to 47 ℃ from 60 ℃ through 42 hours, end groove discharging classification, the thin crystal seed that classifier overflow obtains after filtering mixes stir process and returned first groove in 2 hours with decomposition nut liquid, the grading machine underflow after filtration, promptly obtain granularity-45 μ m after the washing and be 9.2% aluminium hydroxide product, rate of decomposition at that time reaches 52.6%.
Embodiment 4
N with 55 ℃
kThe high density decomposition nut liquid crystal seed of 〉=190g/l 1 hour obtains activating crystal seed; With caustic sodium concentration (N
k) be cooled to 70 ℃ greater than the bayer's process seminal fluid of 190g/l, be mixed into the first groove of decomposition with the activation crystal seed, and the ratio of controlling aluminum oxide in first groove crystal seed (in aluminum oxide) and the solution is 2.5, through decomposing 36 hours, temperature is reduced to 60 ℃, change the cooling gradient then, reduced to 50 ℃ from 60 ℃ through 36 hours, end groove discharging classification, the thin crystal seed that classifier overflow obtains after filtering mixes stir process and returned first groove in 3 hours with decomposition nut liquid, the grading machine underflow after filtration, promptly obtain granularity-45 μ m after the washing and be 6.3% aluminium hydroxide product, rate of decomposition at that time reaches 55.8%.
Embodiment 5
With caustic sodium concentration (N
k) be cooled to 75 ℃ greater than the bayer's process seminal fluid of 220g/l, add cationic-type polyacrylamide tensio-active agent 100ppm/l, stir, be mixed into the first groove of decomposition with the activation crystal seed, and the ratio of controlling aluminum oxide in first groove crystal seed (in aluminum oxide) and the solution is 2.5, through decomposing 36 hours, temperature is reduced to 60 ℃, change the cooling gradient then, reduced to 48 ℃ from 70 ℃ through 48 hours, last groove discharging classification, the thin crystal seed that classifier overflow obtains after filtering mixes stir process and returned first groove in 2.5 hours with decomposition nut liquid, the grading machine underflow after filtration, promptly obtain granularity-45 μ m after the washing and be 6.8% aluminium hydroxide product, rate of decomposition at that time reaches 48.3%.
Embodiment 6
With caustic sodium concentration (N
k) be cooled to 80 ℃ for the bayer's process seminal fluid of 210g/l, add non-ionic polyacrylamide tensio-active agent 80ppm/l, stir, be mixed into the first groove of decomposition with the activation crystal seed, and the ratio of controlling aluminum oxide in first groove crystal seed (in aluminum oxide) and the solution is 3.0, through decomposing 30 hours, temperature is reduced to 65 ℃, change the cooling gradient then, reduced to 46 ℃ from 65 ℃ through 54 hours, last groove discharging classification, the thin crystal seed that classifier overflow obtains after filtering mixes stir process and returned first groove in 3 hours with decomposition nut liquid, the grading machine underflow after filtration, promptly obtain granularity-45 μ m after the washing and be 8.1% aluminium hydroxide product, rate of decomposition at that time reaches 53.6%.
Embodiment 7
With caustic sodium concentration (N
k) be cooled to 75 ℃ for the bayer's process seminal fluid of 200g/l, add anion-polyacrylamide tensio-active agent 50ppm/l, stir, be mixed into the first groove of decomposition with the activation crystal seed, and the ratio of controlling aluminum oxide in first groove crystal seed (in aluminum oxide) and the solution is 2.0, through decomposing 30 hours, temperature is reduced to 60 ℃, change the cooling gradient then, reduced to 47 ℃ from 60 ℃ through 42 hours, last groove discharging classification, the thin crystal seed that classifier overflow obtains after filtering mixes stir process and returned first groove in 2 hours with decomposition nut liquid, the grading machine underflow after filtration, promptly obtain granularity-45 μ m after the washing and be 7.9% aluminium hydroxide product, rate of decomposition at that time reaches 55.8%.
Claims (3)
1. the method that ultrahigh concentration sodium aluminate solution decomposes is characterized in that and will release souls from purgatory concentration N
kBe that the processing condition that 190～220g/l sodium aluminate solution decomposes are: first temperature of separation is 70～80 ℃, and last temperature is 45～55 ℃; Seed load is with Al
2O
3Al in meter and the decomposition stoste
2O
3Weight ratio be 2～3.
2. the method that a kind of ultrahigh concentration sodium aluminate solution according to claim 1 decomposes is characterized in that the crystal seed that adds is to use N
kThe high density decomposition nut liquid of 〉=190g/l is at the activation crystal seed of handling 1～3 hour more than 50 ℃.
3. the method that a kind of ultrahigh concentration sodium aluminate solution according to claim 1 decomposes, it is characterized in that adding in the decomposition course polyacrylamide to improve rate of decomposition, addition is 50～150ppm/l, and addition manner adds before being-is dissolved in the decomposition stoste of not adding crystal seed.
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| CN 200610127318 CN1911808A (en) | 2006-09-14 | 2006-09-14 | Method for decomposing ultrahigh concentration sodium aluminate solution |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102557093A (en) * | 2012-03-01 | 2012-07-11 | 东北大学 | Additive applied to process for producing aluminum oxide by bayer method and preparation method of additive |
| CN111484055A (en) * | 2019-01-29 | 2020-08-04 | 娄世彬 | Decomposition crystallization auxiliary agent used in alumina production process |
| CN114735733A (en) * | 2022-04-29 | 2022-07-12 | 中国铝业股份有限公司 | Preparation method of superfine low-apparent-density aluminum hydroxide |
-
2006
- 2006-09-14 CN CN 200610127318 patent/CN1911808A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102557093A (en) * | 2012-03-01 | 2012-07-11 | 东北大学 | Additive applied to process for producing aluminum oxide by bayer method and preparation method of additive |
| CN102557093B (en) * | 2012-03-01 | 2015-03-18 | 东北大学 | Additive applied to process for producing aluminum oxide by bayer method and preparation method of additive |
| CN111484055A (en) * | 2019-01-29 | 2020-08-04 | 娄世彬 | Decomposition crystallization auxiliary agent used in alumina production process |
| CN114735733A (en) * | 2022-04-29 | 2022-07-12 | 中国铝业股份有限公司 | Preparation method of superfine low-apparent-density aluminum hydroxide |
| CN114735733B (en) * | 2022-04-29 | 2023-09-22 | 中国铝业股份有限公司 | Preparation method of superfine low apparent density aluminum hydroxide |
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