CN101607724B - Method for dissolving out alumina in bauxite by using sodium hydroxide - Google Patents
Method for dissolving out alumina in bauxite by using sodium hydroxide Download PDFInfo
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- CN101607724B CN101607724B CN2008101109824A CN200810110982A CN101607724B CN 101607724 B CN101607724 B CN 101607724B CN 2008101109824 A CN2008101109824 A CN 2008101109824A CN 200810110982 A CN200810110982 A CN 200810110982A CN 101607724 B CN101607724 B CN 101607724B
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- bauxite
- stripping
- sodium hydroxide
- sodium
- alumina
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Abstract
The invention discloses a method for dissolving out bauxite to produce alumina by using sodium hydroxide solution as dissolving agent. Compared with a Bayer's method using seed separation mother liquor as dissolving agent, the method of the invention can greatly improve the dissolving capacity of unit alkali liquor, and can be used for the dissolution of the alumina in the low-grade bauxite after pre-desilication treatment. The method reduces futile cycle of materials, and remarkably improves the production efficiency of equipment. The sodium hydroxide solution used by the method can be recycled by using film electrolytic sodium aluminate to decompose mother liquor, namely sodium carbonate solution.
Description
Technical field
The present invention relates to the production field of aluminum oxide, particularly utilize method of alumina in high-purity high-concentration sodium hydroxide liquid stripping bauxite.
Technical background
The method of alumina producing mainly contains Bayer process, sintering process and integrated process both at home and abroad at present.Integrated process only is the combination of Bayer process and sintering process.The Bayer process energy consumption is low, is the processing method of the production aluminum oxide that generally adopts of present countries in the world.Sintering process energy consumption height only is used for the alumina producing of siliceous high inferior quality ore.The bayer process flow process is: with the aluminum oxide in the sodium hydroxide solution stripping bauxite that contains sodium aluminate, the method (plant and divide) of adopt adding aluminium hydroxide crystal seed then makes the sodium aluminate solution branch after the stripping parse aluminium hydroxide, again after solid-liquid separation, aluminum oxide is made in the solid aluminum hydroxide roasting, and liquid (mother liquor) returns the new ore of stripping operation stripping.
The process in leaching of bayer process is with kind of a process of dividing aluminum oxide in the circulating mother liquor stripping bauxite.Since the rate of decomposition of plant dividing has only～50%, the aluminium sodium mass ratio of circulating mother liquor is about 0.5, contain a large amount of aluminium hydroxide in circulating mother liquor, thereby its stripping capacity and material cycle efficiency to the aluminum oxide in the bauxite can only have been given play to about 50%, energy consumption is also higher relatively.Substitute original circulating mother liquor near zero purified hydrogen sodium hydroxide solution as the stripping agent if use aluminium sodium mass ratio instead, obviously can increase substantially the stripping capacity of stripping agent to the aluminum oxide in the bauxite, the key of problem is the purified hydrogen sodium hydroxide solution that how to obtain recyclable regenerative continuously.
In a Chinese invention patent " a kind of technology of producing aluminum oxide by alkali dissolving carbonation method (application number 200710178670.2) " of declaring in 2007, proposed a kind of " with the sodium hydroxide solution is the stripping agent; the aluminum oxide in the stripping bauxite obtains sodium aluminate solution; Obtain aluminium hydroxide solid precipitation and sodium carbonate solution with using sodium bicarbonate to decompose sodium aluminate solution; After the solid-liquid separation, the aluminium hydroxide solid precipitation is used for roasting and produces alumina product, yellow soda ash is converted into the sodium hydroxide solution and the sodium hydrogen carbonate solution of reusable edible by electrolysis, be that gained sodium hydroxide returns the new ore of stripping operation stripping, the gained sodium bicarbonate returns decomposition sodium aluminate liquid " the processing method of production aluminum oxide.
The present invention relates in the above-mentioned producing aluminum oxide by alkali dissolving carbonation method technology with the sodium hydroxide solution is the stripping novel method that aluminum oxide is produced in ore stripping agent.Stripping agent-sodium hydroxide solution proposed by the invention is owing to make by the yellow soda ash electrolysis, thus its aluminium sodium mass ratio near zero, and its naoh concentration concentration sodium hydroxide in the Bayer process mother liquor.The application of this just pure high-concentration sodium hydroxide solution causes the stripping capacity of process in leaching and efficiency of equipment to be greatly improved.
Summary of the invention
The object of the present invention is to provide a kind of is the method for stripping agent stripping bauxite into alumina with the sodium hydroxide solution.Adopt seed precipitation solution (containing the undecomposed sodium aluminate of part) to compare as the method for dissolution fluid with bayer's process, this method can increase substantially stripping capacity, and significantly improves efficiency of equipment.
Ore stripping agent used in the present invention-pure high-concentration sodium hydroxide solution, can apply for a patent the molten carbon of 200710178670.2 alkali that disclose by 2007 and divide alumina-producing method, promptly the method that " adopts using sodium bicarbonate to decompose sodium aluminate solution, with the film electrolysis mode decomposition nut liquid sodium carbonate solution is converted into the sodium bicarbonate and the sodium hydroxide of reusable edible then " obtains.
What the present invention proposed is that method of alumina is achieved through the following technical solutions in the stripping agent stripping bauxite with the sodium hydroxide solution.
With concentration is that 100～300g/L is (with Na
2The O meter) sodium hydroxide solution is as the stripping agent, according to certain sodium al mole ratio (Na in the stripping agent
2Al in O and the bauxite
2O
3Mol ratio) mix with bauxite, handle through pre-desiliconization, carry out stripping at 240～280 ℃ again, the digesting efficiency of alumina in the ore can reach more than 70%.
What the present invention proposed is method of alumina in the stripping agent stripping bauxite with the sodium hydroxide solution, and its advantage is:
The first, the dissolution efficiency of unit mass alkali lye improves.Contain the 50% undecomposed sodium aluminate of having an appointment (being that the sodium aluminum ratio is about about 0.5) in the bayer's process seed precipitation solution, with the aluminum oxide in this mother liquor stripping bauxite, average every kilogram of Na
2O stripping aluminum oxide is about 0.3 kilogram; Adopt the high-purity hydrogen sodium hydroxide solution that does not contain sodium aluminate, average every kilogram of Na in the inventive method
2The leachable Al of O
2O
30.7 kilogram, dissolution efficiency significantly improves;
The second, sodium hydroxide stripping agent can realize recycle by the film electrolysis mode.
Three, adopt suitable method for desilication, this method is also applicable to the stripping of aluminum oxide in the middle-low bauxite.
For the feature of present technique invention better is described, describe below by specific embodiment.
Embodiment
Embodiment 1 sodium hydroxide solution and bayer's process seed precipitation solution compare the dissolving out capability of aluminum oxide in the bauxite
Getting caustic sodium concentration is that 194g/L (presses Na
2The O meter), total alkalinity is that 215g/L (presses Na
2The O meter), Al
2O
3Content is that the bayer's process seed precipitation solution of 96g/L is the stripping agent, according to the Na of stripping agent
2The Al of O and bauxite
2O
3Mol ratio be 1.29 ratio batching, the bauxite to alumina silica ratio A/S=5.07 in high pressure vessel carries out the high pressure stripping, control stripping temperature is 240～280 ℃, dissolution time is 40 minutes.Stripping is the result show, alumina silica ratio A '/S '=1.28 of red mud, and circulating mother liquor is to the Al in the bauxite
2O
3Solubility rate η=[1-(A '/S ')/(A/S)] * 100%=74.8%, the Al in the dissolution fluid
2O
3Content rises to 190g/L.As can be known, the average dissolution efficiency of seed precipitation solution is every kilogram of Na
20.303 kilogram of Al of O stripping
2O
3
Get Na
2O content is that the sodium hydroxide solution of 194g/L is the stripping agent, according to the Na of stripping agent
2The Al of O and bauxite
2O
3Mol ratio be 1.30 ratio batching, the bauxite to alumina silica ratio A/S=5.07 in high pressure vessel carries out the high pressure stripping, control stripping temperature is 240～280 ℃, dissolution time is 40 minutes.Stripping is the result show, alumina silica ratio A '/S '=1.29 of red mud, and sodium hydroxide solution is to the Al in the bauxite
2O
3Solubility rate η=[1-(A '/S ')/(A/S)] * 100%=74.5%, the Al in the dissolution fluid
2O
3Content is 188g/L.The average dissolution efficiency of sodium hydroxide solution that does not contain sodium aluminate is every kilogram of Na
20.698 kilogram of Al of O stripping
2O
3
The alumina silica ratio of embodiment 2 concentration of sodium hydroxide solution and bauxite and the relation of digesting efficiency of alumina
Respectively with concentration be 100,200 or 300g/L (with Na
2O meter) sodium hydroxide solution is the stripping agent, investigates it is respectively aluminum oxide in 4.02,5.07 or 7.15 the bauxite to alumina silica ratio A/S dissolution efficiency, selects the sodium al mole ratio of stripping agent and bauxite to be respectively 1.0,1.3 or 1.6.After low temperature carries out pre-desiliconization and handles, in being 240～280 ℃ high pressure vessel, temperature carries out 60 minutes high pressure stripping, and the digesting efficiency of alumina of analysis and measurement bauxite the results are shown in following table.
| Sequence number | Sodium hydroxide stripping agent concentration, g/L (presses Na 2The O meter) | The alumina silica ratio of bauxite | The sodium al mole ratio of stripping agent and bauxite | Digesting efficiency of alumina in the bauxite, % |
| 1 | 100 | 5.07 | 1.3 | 71.5 |
| 2 | 200 | 5.07 | 1.3 | 73.2 |
| 3 | 300 | 5.07 | 1.3 | 81.3 |
| 4 | 100 | 4.02 | 1.3 | 67.6 |
| 5 | 200 | 4.02 | 1.3 | 70.4 |
| 6 | 300 | 4.02 | 1.3 | 73.2 |
| 7 | 100 | 7.15 | 1.0 | 70.5 |
| 8 | 200 | 7.15 | 1.3 | 84.0 |
| 9 | 300 | 7.15 | 1.6 | 87.8 |
As can be seen from the above table data, use Na
2O content is that the sodium hydroxide solution of 100～300g/L is the stripping agent of 4～7 middle-low bauxite as alumina silica ratio, keep the sodium al mole ratio of stripping agent and bauxite between 1～1.6, to carry out the high pressure stripping during batching, can obtain the digesting efficiency of alumina more than 70%.
Claims (1)
1. method of utilizing sodium hydroxide stripping bauxite into alumina, it is characterized in that the stripping agent is is the sodium hydroxide solution that sodium carbonate solution is realized recycle by film electrolysis sodium aluminate decomposition nut liquid, in the described sodium hydroxide solution aluminium sodium mass ratio approach zero, with Na
2O meter concentration is 100～300g/L, is 1.0～1.6 mixed according to the sodium al mole ratio of stripping agent and bauxite, carries out stripping 40～60 minutes in temperature is 240～280 ℃ high pressure vessel, can obtain the digesting efficiency of alumina more than 70%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101109824A CN101607724B (en) | 2008-06-19 | 2008-06-19 | Method for dissolving out alumina in bauxite by using sodium hydroxide |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101109824A CN101607724B (en) | 2008-06-19 | 2008-06-19 | Method for dissolving out alumina in bauxite by using sodium hydroxide |
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| Publication Number | Publication Date |
|---|---|
| CN101607724A CN101607724A (en) | 2009-12-23 |
| CN101607724B true CN101607724B (en) | 2010-12-15 |
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|---|---|---|---|
| CN2008101109824A Expired - Fee Related CN101607724B (en) | 2008-06-19 | 2008-06-19 | Method for dissolving out alumina in bauxite by using sodium hydroxide |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3072956B1 (en) * | 2017-10-31 | 2024-03-01 | Amber Dev | BAUXITE TREATMENT PROCESS |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6391277B1 (en) * | 1997-11-17 | 2002-05-21 | Aluminium Pechiney | Bayer process for production of alumina trihydrate |
| CN1792799A (en) * | 2006-01-16 | 2006-06-28 | 中国铝业股份有限公司 | Process for raising producing aluminium oxide circulating efficiency by Bayer process |
-
2008
- 2008-06-19 CN CN2008101109824A patent/CN101607724B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6391277B1 (en) * | 1997-11-17 | 2002-05-21 | Aluminium Pechiney | Bayer process for production of alumina trihydrate |
| CN1792799A (en) * | 2006-01-16 | 2006-06-28 | 中国铝业股份有限公司 | Process for raising producing aluminium oxide circulating efficiency by Bayer process |
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