CN101125671A - Method for separating red mud during aluminum oxide producing process - Google Patents
Method for separating red mud during aluminum oxide producing process Download PDFInfo
- Publication number
- CN101125671A CN101125671A CNA2007101186722A CN200710118672A CN101125671A CN 101125671 A CN101125671 A CN 101125671A CN A2007101186722 A CNA2007101186722 A CN A2007101186722A CN 200710118672 A CN200710118672 A CN 200710118672A CN 101125671 A CN101125671 A CN 101125671A
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- CN
- China
- Prior art keywords
- red mud
- filter
- aluminum oxide
- filtration
- separation method
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 title claims description 17
- 238000000034 method Methods 0.000 title abstract description 23
- 238000004519 manufacturing process Methods 0.000 claims abstract description 21
- 238000000926 separation method Methods 0.000 claims abstract description 18
- 238000001914 filtration Methods 0.000 claims abstract description 16
- 239000002002 slurry Substances 0.000 claims abstract description 15
- 239000000706 filtrate Substances 0.000 claims abstract description 10
- 230000018044 dehydration Effects 0.000 claims description 3
- 238000006297 dehydration reaction Methods 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 9
- 230000008929 regeneration Effects 0.000 abstract description 7
- 238000011069 regeneration method Methods 0.000 abstract description 7
- 239000007787 solid Substances 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 5
- 238000005406 washing Methods 0.000 abstract description 3
- 239000000047 product Substances 0.000 abstract description 2
- 239000002351 wastewater Substances 0.000 abstract description 2
- 230000029087 digestion Effects 0.000 abstract 2
- 238000004140 cleaning Methods 0.000 abstract 1
- 238000007599 discharging Methods 0.000 abstract 1
- 230000004907 flux Effects 0.000 abstract 1
- 238000003825 pressing Methods 0.000 abstract 1
- 239000012065 filter cake Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 239000005432 seston Substances 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000005189 flocculation Methods 0.000 description 4
- 230000016615 flocculation Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000004131 Bayer process Methods 0.000 description 3
- 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 3
- 239000003518 caustics Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 238000010977 unit operation Methods 0.000 description 2
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000006210 lotion Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000001471 micro-filtration Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 210000000582 semen Anatomy 0.000 description 1
- -1 sintering process Chemical compound 0.000 description 1
- 229910001388 sodium aluminate Inorganic materials 0.000 description 1
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- Filtering Materials (AREA)
Abstract
A separation method of red mud in alumina production process relates to a liquid-solid separation method of digestion red mud slurry in the process of the alumina production. The invention is characterized in that the red mud slurry of the alumina production is filtered and separated by directly adopting a microporous filter to obtain filtrate and dehydrated red mud. The type of a filter press used for filtrating and separating is a SK-PGK type, and the technical process is that: material feeding, filtration, washing, dry pressing, residue discharging, regeneration, material feeding and so on; the parameters of the technique are that the pressure is 0.20-0.70 MPa, the temperature is 60-150 DEG C, the flux is 10 m3/h, the filtrating area is 5-200 m3, solid in the digestion red mud is 50-180 g/L, suspended material in the filtrate is not more than 0.005 g/L, filtrated cake containing water is not more than 20 percent. The method of the invention simplifies the technical process, uses no flocculant, and the high clarity solution with less suspended material and red mud with little wastewater can be obtained by one-time filtration. The invention has high filtration efficiency, easy operation, low labor intensity, long service life of filter media, and is convenient in regeneration cleaning with high efficiency, thereby improving the quality of the products and reducing the production cost.
Description
Technical field
Red mud separation method in a kind of aluminum oxide production process relates to the solid separation method of red mud slurry after the stripping in a kind of aluminum oxide production process.
Background technology
In aluminum oxide industry is produced; the liquid-solid separation of slurries is indispensable unit operation; wherein red mud separation, wash and store up, not only to stably manufactured, fall and can save the consumption and the very important effect that reduces production costs, and be related to protection to surrounding environment.From the liquid-solid separation processes developing history of domestic and international red mud slurry, successively experienced plate-and-frame filter press, the sedimentation strainer, subsider+flocculation agent, subsider+rotary drum filter, multitray settling tank, the individual layer subsider, high rate settling (comprising super subsider and high cone angle high rate settling), swirler+subsider, swirler+box filter, swirler+sedimentation centrifuge+subsider, the liquid-solid separation of membrane technique etc., all there is certain defective in these technologies, the complicated operation that has, the filtration medium knot is hard fast, the disengaging time that has is long, the alumina process loss amount is big, the equipment operation precision prescribed height that has, running period is short, the alumina technology condition that do not fit into difficult in maintenance, as to have.With regard to present technology, alumina producing will produce qualified seminal fluid (sodium aluminate decomposition stoste), technology based on subsider+flocculation agent+filter+leaf filter, filtration medium has filter cloth, metal twine and ceramic filter medium etc., have that filter cloth knot is hard, corrosion or efficient is low, handle problems such as regeneration of contaminated, the separating red mud attached liquid is higher, even storing up, dry method also reaches 38%～48%, alumina loss is big in the red mud separating, washing process, especially the process of sintering process, because disengaging time is long, reaches as high as 3% of solubility rate.
Summary of the invention
The objective of the invention is the deficiency that exists in the above-mentioned prior art, propose a kind ofly can effectively simplify technical process, not use flocculation agent, the filtering solution seston is few, clarity is high, and wastewater from red mud is low, red mud separation method in the aluminum oxide production process easy and simple to handle.
The objective of the invention is to be achieved through the following technical solutions.
Red mud separation method in a kind of aluminum oxide production process is characterized in that it being to adopt microporous filter to carry out filtering separation the red mud slurry in the aluminum oxide production process, directly obtains filtrate and dehydration red mud.
Method of the present invention can be used for existing at present technological process of producing aluminum oxide such as sintering process, Bayer process and mixed combining method.Because the subsider that does not use the red mud in the conventional aluminum oxide production process to separate and wash, simplified technical process, and do not use flocculation agent, once filter and can obtain few good clarity solution of seston and the lower red mud of attached liquid, the filtration efficiency height, easy and simple to handle, labour intensity is low, filtration medium long service life, regeneration are cleaned conveniently, efficient is high, are the innovations greatly to current operating process., labour intensity is low, the filtration medium long service life, and regeneration is cleaned conveniently, efficient is high; This technology is cancelled smart filtering workshop section, can obtain higher alumina extraction efficient, preferably liquid-solid component is separated, each unit operation is merged,, adopt the technical process that has more effectiveness to reduce fund input amount, use first-class design, reduce the wash water consumption, cut down energy-output ratio, can improve the quality of products and reduce production costs.
Description of drawings
Fig. 1 is the equipment flowsheet synoptic diagram that method of the present invention is used.
Embodiment
Red mud separation method in a kind of aluminum oxide production process is characterized in that it being directly to adopt microporous filter to carry out filtering separation the red mud slurry in the aluminum oxide production process, obtains filtrate and dehydration red mud.
Red mud separation method in a kind of aluminum oxide production process of the present invention, the pressure filter that its filtering separation adopts is the SK-PGK type, its technological process comprises charging, filtration, washs, press dry, deslagging, regeneration, charging; Its filtration area is 5～200m
3, exsolution red mud slurries slurries contain 50～180g/L admittedly, filtrate seston ≯ 0.01g/L, filter cake attached water ≯ 20%.
Embodiment 1
The microporous filter that uses is the SK-PGK-60 type; The equipment of its preparation and flow process as shown in Figure 1, wherein: 1 be air compressor, 2 for air filter, 3 for gas-holder, 4 for positive mouthpiece, 5 for precise microporous filter, 6 for back blow port, 7 for filtrate port, 8 for the washing lotion mouth, 9 for sampling, 10 for relief tube, 11 for the hot concentrated alkali groove, 12 for hot water tank, 13 for slurry vessel, 14 for transferpump, 15 for slag-drip opening.
High-alkalinity red mud slurry composition after the stripping in the Bayer process aluminum oxide production process: admittedly contain 120g/L, caustic sodium concentration N
k185g/L; Directly send into microporous filter, concrete processing parameter: pressure 0.3MPa, 120 ℃ of temperature, flow 10m
3/ h; Obtain the few high filtrate of clarity of seston and contain 0.0085g/L admittedly; Filter cake moisture 15%.
After microporous filter runs to specific thickness, unfiltered material in the machine is pressed into back into hopper with the positive mouthpiece of pressurized air from filter, uses the hot wash filter cake of hot water tank subsequently, be pressed into the positive mouthpiece of pressurized air again from filter, filter cake is pressed dry, use 10 releases; Open filter bottom major diameter deslagging bottom with the air-operated drive cylinder, pressurized air is sent in the rigidity microfiltration tube from the filter liquid outlet, carry out blowback 6, the filter cake on the strainer tube outer wall is come off by bottom discharge machine outer 15; Microporous filter moves some all after dates, and it is standby to use 11 regeneration of hot concentrated alkali liquid to clean the back.
Embodiment 2
In the Bayer process aluminum oxide production process, red mud slurry stops back high-alkalinity red mud slurry composition through dilution after the stripping: admittedly contain 85g/L, caustic sodium concentration N
k152g/L; Directly send into microporous filter, concrete processing parameter: pressure 0.25MPa, 105 ℃ of temperature, flow 10m
3/ h; Obtain the few high filtrate of clarity of seston and contain 0 admittedly, 0055g/L; Filter cake moisture 18%.
Embodiment 3
In the alumina by sintering production process, red mud slurry composition after the grog stripping: admittedly contain 75g/L, caustic sodium concentration N
k100g/L; Directly send into microporous filter, concrete processing parameter pressure: 0.20MPa, 80 ℃ of temperature, flow 9m
3/ h; Obtain the few high filtrate of clarity of seston and contain 0.0064g/L admittedly; Filter cake moisture 18%.
Claims (1)
1. red mud separation method in the aluminum oxide production process is characterized in that it being to adopt microporous filter to carry out filtering separation the red mud slurry in the aluminum oxide production process, directly obtains filtrate and dehydration red mud.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101186722A CN101125671A (en) | 2007-07-12 | 2007-07-12 | Method for separating red mud during aluminum oxide producing process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101186722A CN101125671A (en) | 2007-07-12 | 2007-07-12 | Method for separating red mud during aluminum oxide producing process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101125671A true CN101125671A (en) | 2008-02-20 |
Family
ID=39093826
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101186722A Pending CN101125671A (en) | 2007-07-12 | 2007-07-12 | Method for separating red mud during aluminum oxide producing process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101125671A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101928028A (en) * | 2010-08-27 | 2010-12-29 | 中国铝业股份有限公司 | Method for producing alumina by mixed combined process |
| CN102120595B (en) * | 2010-01-07 | 2013-11-20 | 贵阳铝镁设计研究院有限公司 | Red mud separating and washing method |
-
2007
- 2007-07-12 CN CNA2007101186722A patent/CN101125671A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102120595B (en) * | 2010-01-07 | 2013-11-20 | 贵阳铝镁设计研究院有限公司 | Red mud separating and washing method |
| CN101928028A (en) * | 2010-08-27 | 2010-12-29 | 中国铝业股份有限公司 | Method for producing alumina by mixed combined process |
| CN101928028B (en) * | 2010-08-27 | 2012-07-25 | 中国铝业股份有限公司 | Method for producing alumina by mixed combined process |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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