CN105565349A - Recycling method for leaf filter residues in aluminum oxide production - Google Patents
Recycling method for leaf filter residues in aluminum oxide production Download PDFInfo
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- CN105565349A CN105565349A CN201610031883.1A CN201610031883A CN105565349A CN 105565349 A CN105565349 A CN 105565349A CN 201610031883 A CN201610031883 A CN 201610031883A CN 105565349 A CN105565349 A CN 105565349A
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- filter residue
- solid
- liquid separation
- recoverying
- aluminum oxide
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- 238000000034 method Methods 0.000 title claims abstract description 51
- 238000004064 recycling Methods 0.000 title claims abstract description 7
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 title abstract description 17
- 238000004519 manufacturing process Methods 0.000 title abstract description 10
- 239000007788 liquid Substances 0.000 claims abstract description 49
- 238000000926 separation method Methods 0.000 claims abstract description 25
- 230000008569 process Effects 0.000 claims abstract description 23
- 239000012065 filter cake Substances 0.000 claims abstract description 19
- 239000002002 slurry Substances 0.000 claims abstract description 17
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 13
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 13
- 239000004571 lime Substances 0.000 claims abstract description 13
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 11
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 34
- 239000000920 calcium hydroxide Substances 0.000 claims description 32
- 235000011116 calcium hydroxide Nutrition 0.000 claims description 32
- 238000006243 chemical reaction Methods 0.000 claims description 29
- 210000000481 breast Anatomy 0.000 claims description 23
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 23
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 23
- 229920002401 polyacrylamide Polymers 0.000 claims description 19
- 238000001914 filtration Methods 0.000 claims description 16
- 239000007787 solid Substances 0.000 claims description 13
- 239000004744 fabric Substances 0.000 claims description 11
- 239000000706 filtrate Substances 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- 230000008016 vaporization Effects 0.000 claims description 10
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims description 9
- 229910001424 calcium ion Inorganic materials 0.000 claims description 9
- 210000000582 semen Anatomy 0.000 claims description 8
- 239000002904 solvent Substances 0.000 claims description 8
- 239000010881 fly ash Substances 0.000 claims description 7
- 230000003311 flocculating effect Effects 0.000 claims description 5
- LZJOBYGVGAAXFX-UHFFFAOYSA-N O.O.O.O.O.O.[AlH3] Chemical compound O.O.O.O.O.O.[AlH3] LZJOBYGVGAAXFX-UHFFFAOYSA-N 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- 239000003518 caustics Substances 0.000 claims description 3
- 239000000654 additive Substances 0.000 abstract description 11
- 230000000996 additive effect Effects 0.000 abstract description 11
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 abstract description 7
- 239000000292 calcium oxide Substances 0.000 abstract description 7
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 6
- 150000001875 compounds Chemical class 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 abstract description 2
- 239000000047 product Substances 0.000 abstract description 2
- 238000001704 evaporation Methods 0.000 abstract 1
- 230000008020 evaporation Effects 0.000 abstract 1
- 239000010413 mother solution Substances 0.000 abstract 1
- 238000003825 pressing Methods 0.000 abstract 1
- 239000011550 stock solution Substances 0.000 abstract 1
- 238000004062 sedimentation Methods 0.000 description 11
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 9
- 239000007791 liquid phase Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 239000006228 supernatant Substances 0.000 description 5
- 238000002386 leaching Methods 0.000 description 4
- 210000002966 serum Anatomy 0.000 description 3
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000005432 seston Substances 0.000 description 2
- 229910001388 sodium aluminate Inorganic materials 0.000 description 2
- 241000638935 Senecio crassissimus Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000404 calcium aluminium silicate Substances 0.000 description 1
- 235000012215 calcium aluminium silicate Nutrition 0.000 description 1
- WNCYAPRTYDMSFP-UHFFFAOYSA-N calcium aluminosilicate Chemical compound [Al+3].[Al+3].[Ca+2].[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O WNCYAPRTYDMSFP-UHFFFAOYSA-N 0.000 description 1
- 229940078583 calcium aluminosilicate Drugs 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000000967 suction filtration Methods 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 229910001773 titanium mineral Inorganic materials 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention provides a recycling method for leaf filter residues in aluminum oxide production and relates to an improvement in an aluminum oxide production method. The recycling method is characterized in that during the recycling process, leaf filter residue slurry is subjected to solid-liquid separation, and separated feed liquid is returned to a coarse liquid tank; after bottom current obtained after solid-liquid separation is subjected to dealuminization and filter pressing, filter liquid is conveyed to a decomposition mother solution or evaporation stock solution tank, and filter cakes are returned to a lime stock bin. According to the recycling method for the leaf filter residues in aluminum oxide production, compounds of aluminum oxide and calcium oxide in the leaf filter residues can be effectively recycled, the compounds become an effective additive of aluminum oxide products and for aluminum oxide dissolved matter, aluminum oxide is recycled, emissions of red mud are reduced, and therefore good economic benefits and environmental benefits are achieved.
Description
Technical field
A recoverying and utilizing method for alumina producing middle period filter residue, relates to a kind of improvement of alumina-producing method.
Background technology
At present, in alumina producing, the leaf of thick liquid filters Cheng Caiyong milk of lime or adds a part of flyash as flocculating aids.Leaf filter residue slurries are the extension mud mixed serums on seminal fluid and the filter cloth of recoil filter cloth, and leaf filter residue slurries drain into filter cake groove usually, its consolidate containing for 30 ?100g/l, main component is the compound of seminal fluid, red mud and aluminum oxide and calcium oxide.
Lime is leaching additive in alumina producing, cardinal principle is that lime reacts generation calcium aluminate in sodium aluminate solution, in ore process in leaching, eliminate the impact of titanium mineral, make part Sodium-silica slag change calcium aluminosilicate hydrate reduction alkaline consumption into, in stripping reaction process, play katalysis simultaneously, accelerate process in leaching and carry out.The flocculating aids that thick liquid leaf filter is added, most aluminum oxide factory uses slaked lime breast, and small part uses the mixture of slaked lime breast and flyash.Thick liquid seston main component is red mud, does not react with milk of lime.Milk of lime is added in thick liquid, can reacts with thick liquid and sodium aluminate solution, produce porous calcium aluminate and hang on filter cloth, play the effect of drainage.Within a leaf filter cycle of operation, the solids such as calcium aluminate that thick liquid seston and reaction generate along with seminal fluid recoil, empty in filter cake groove.
Carry out suction filtration, washing, oven dry to leaf filter residue slurry samples, leaf filter residue solid is analyzed, when not adding flyash aluminum oxide account for about 30%, A/S be 5 ?7; When adding part flyash, aluminum oxide account for 25% ?about 28%, A/S be 2 ?3, calcium oxide content 20% ?30%.The current major part of leaf filter residue solid is arranged into red mud outward, have lost aluminum oxide and calcium oxide, make red mud amount increase simultaneously.
Summary of the invention
Object of the present invention is exactly the deficiency existed for above-mentioned prior art, provide a kind of effectively can reclaim aluminum oxide and calcium oxide in leaf filter residue compound, reduce the discharge of red mud, there is the recoverying and utilizing method of the leaf filter residue of good economic benefit and environmental benefit in alumina producing.
The object of the invention is to be achieved through the following technical solutions.
A recoverying and utilizing method for alumina producing middle period filter residue, it is characterized in that its recycling process is that leaf filter residue slurries are carried out solid-liquid separation, isolated feed liquid sends thick liquid bath back to; The underflow of solid-liquid separation is after dealuminzation, press filtration, and filtrate send decomposition nut liquid or vaporizing raw liquor groove, and filter cake turns back to lime batch bin.
The recoverying and utilizing method of a kind of alumina producing middle period filter residue of the present invention, is characterized in that solid-liquid separation process adds polyacrylamide polymeric additive, add-on be leaf filter residue solid masses 0.03 ‰ ?0.1 ‰.
The recoverying and utilizing method of a kind of alumina producing middle period filter residue of the present invention, it is characterized in that adding slaked lime breast in the dealumination process of the underflow process of solid-liquid separation, slaked lime breast addition by caustic ratio after resultant aluminum hexahydrate acid DFP, reaction reach 2.8 ?3.5 to calculate.
The recoverying and utilizing method of a kind of alumina producing middle period filter residue of the present invention, is characterized in that the dealumination process of the underflow process of solid-liquid separation is at 60 DEG C of-90 DEG C of temperature, carries out stirring reaction 25 minutes-50 minutes.
The recoverying and utilizing method of a kind of alumina producing middle period filter residue of the present invention, it is characterized in that the solvent and solute weight ratio of the underflow after solid-liquid separation be 2 ?3.
The recoverying and utilizing method of a kind of alumina producing middle period filter residue of the present invention, is characterized in that the underflow of solid-liquid separation adds the solid containing being 200 ± 50g/l of slaked lime breast through dealumination process in solid-liquid separation underflow, the active calcium ion content 60% ?90%.
The recoverying and utilizing method of a kind of alumina producing middle period filter residue of the present invention, is characterized in that its leaf filter residue is that thick liquid leaf filters in journey the filter residue adopting milk of lime or milk of lime to add flyash to produce as flocculating aids.
The recoverying and utilizing method of a kind of alumina producing middle period filter residue of the present invention, and it is characterized in that the slip that its leaf filter residue slurries are made up of the extension mud on seminal fluid and the filter cloth of recoil filter cloth, admittedly contain 30 ?100g/l.
The recoverying and utilizing method of a kind of alumina producing middle period filter residue of the present invention, effectively can reclaim the compound of aluminum oxide and calcium oxide in leaf filter residue, make it the effective additive becoming alumina product and alumina leaching, both aluminum oxide had been reclaimed, decrease the discharge of red mud simultaneously, therefore there is good economic benefit and environmental benefit.
Accompanying drawing explanation
Fig. 1 is the process flow sheet of the recoverying and utilizing method of a kind of alumina producing middle period filter residue of the present invention.
Embodiment
A kind of recoverying and utilizing method of alumina producing middle period filter residue, after the leaf filter residue slurries extension mud mixed serum namely recoiled on the seminal fluid of filter cloth and filter cloth drains into the filter cake groove be with and stirred, the separator tank being with rake machine is made at filter cake groove, or after the filter cake groove that band stirs is sent by pumping to the solid-liquor separation groove being with rake machine, after adding a kind of suitably appropriate additive, solid-liquor separation, separated slip overflow type pump sends thick liquid bath back to; The underflow be separated is after slaked lime breast dealuminzation, pressure filter press filtration, and filtrate send decomposition nut liquid or vaporizing raw liquor groove, and filter cake turns back to lime silo.
Its leaf filter residue slurries, namely after the extension mud mixed serum recoiled on the seminal fluid of filter cloth and filter cloth drains into the filter cake groove be with and stirred, admittedly containing 30 ?100g/l, main component is the compound of seminal fluid, red mud and aluminum oxide and calcium oxide, make at filter cake groove the separator tank being with rake machine into, or be sent by pumping to the solid-liquor separation groove of band rake machine at the filter cake groove that band stirs, after adding a kind of polyacrylamide polymeric additive, solid-liquid separation, separated slip overflow type pump sends thick liquid bath back to; The underflow be separated is after dealuminzation, press filtration, and filtrate send decomposition nut liquid or vaporizing raw liquor groove, and filter cake turns back to lime silo.Underflow treatment process is as follows: its liquid-solid ratio is 2 ?3, add slaked lime breast steel basin carry out dealumination reaction, promote caustic ratio reach 2.8 ?3.5, slaked lime breast is admittedly containing 200 ± 50g/l, the active calcium ion content 60% ?90%, addition is strictly pressed resultant aluminum hexahydrate acid DFP and is calculated, temperature of reaction 60 DEG C-90 DEG C, 25 minutes-50 minutes time.
Thick liquid leaf filters in journey and adopts milk of lime or milk of lime to add a part of flyash as flocculating aids, and general employing leaf filter equipment is automatic vertical leaf filter wholly computer controlled.
The method of leaf filter residue is recycled in a kind of alumina producing, leaf filter residue slurries solid-liquid separation, use subsider or thickener equipment, and add a kind of suitably appropriate a kind of polyacrylamide polymeric additive before separation, therefore need use existing facility or separately build adding set.
Just be illustrated in conjunction with specific embodiments below.
Embodiment 1
The test of leaf filter residue slurries separate and subside has been carried out, liquid phase N at certain alumina producer leaf filtering process
k164g/l, Al
2o
3183.88g/l, α
k1.47, Gu containing being 30g/L, press leaf filter residue amount of solid 0.03 ‰ and add a kind of polyacrylamide polymeric additive, heavy speed is fast, good compression property, in 500ml graduated cylinder, sedimentation mud layer interface was by 12 seconds 450ml-350ml used times, and supernatant liquor is clarified, and the solvent and solute weight ratio that underflow after 60 minutes is compressed in sedimentation is 2.0; The polyacrylamide added is the polyacrylamide solution prepared, and concentration is 3.46 ‰.
Slaked lime breast in production, admittedly containing 150g/l, the active calcium ion content 66%; By calcium aluminate chemical formula 3CaO.Al
2o
3.6H
2α after O, dealuminzation
kbe 3.3 to calculate slaked lime breast add-on, under temperature of reaction 80 DEG C of conditions, band stir water bath with thermostatic control react 30 minutes with 50 minutes after, α
kbe promoted to the result of 3.1,3.16 respectively, illustrate dealumination reaction temperature 80 DEG C, 30 minutes time reaction substantially complete.Slip after dealumination reaction carries out press filtration process, and filtrate send decomposition nut liquid groove or vaporizing raw liquor groove, and filter cake turns back to lime silo.
Embodiment 2
The test of leaf filter residue slurries separate and subside has been carried out, liquid phase N at certain alumina producer leaf filtering process
k164g/l, Al
2o
3183.88g/l, α
k1.47, Gu containing being 100g/L, press leaf filter residue amount of solid 0.05 ‰ and add a kind of polyacrylamide polymeric additive, heavy speed is fast, good compression property, in 500ml graduated cylinder, sedimentation mud layer interface was by 16 seconds 450ml-350ml used times, and supernatant liquor is clarified, and the solvent and solute weight ratio that underflow after 60 minutes is compressed in sedimentation is 3.0; The polyacrylamide added is the polyacrylamide solution prepared, and concentration is 3.46 ‰.
Slaked lime breast in production, admittedly containing 211g/l, the active calcium ion content 83.26%; By calcium aluminate chemical formula 3CaO.Al
2o
3.6H
2α after O, dealuminzation
kbe 2.8 to calculate slaked lime breast add-on, under temperature of reaction 80 DEG C of conditions, band stir water bath with thermostatic control react 25 minutes and 50 minutes after, α
kbe promoted to the result of 2.70,2.77 respectively, dealumination reaction temperature 80 DEG C is described, 30 minutes time reacted.Slip after dealumination reaction carries out press filtration process, and filtrate send decomposition nut liquid groove or vaporizing raw liquor groove, and filter cake turns back to lime silo.
Embodiment 3
The test of leaf filter residue slurries separate and subside has been carried out, liquid phase N at certain alumina producer leaf filtering process
k170g/l, Al
2o
3187.88g/l, α
k1.49, Gu containing being 80g/L, press leaf filter residue amount of solid 0.08 ‰ and add a kind of polyacrylamide polymeric additive, heavy speed is fast, good compression property, in 500ml graduated cylinder, sedimentation mud layer interface was by 11 seconds 450ml-350ml used times, and supernatant liquor is clarified, and the solvent and solute weight ratio that underflow after 60 minutes is compressed in sedimentation is 3.0; The polyacrylamide added is the polyacrylamide solution prepared, and concentration is 3.46 ‰.And do not add other additive any, without effect of settling in 30 minutes.
Slaked lime breast in production, admittedly containing 250g/l, the active calcium ion content 60%; By calcium aluminate chemical formula 3CaO.Al
2o
3.6H
2α after O, dealuminzation
kbe 3.5 to calculate slaked lime breast add-on, under temperature of reaction 60 DEG C of conditions, band stir water bath with thermostatic control react 25 minutes and 50 minutes after, α
kbe promoted to the result of 3.47,3.48 respectively, illustrate dealumination reaction temperature 60 C, 50 minutes time reaction substantially complete.Slip after dealumination reaction carries out press filtration process, and filtrate send decomposition nut liquid groove or vaporizing raw liquor groove, and filter cake turns back to lime silo.
Embodiment 4
The test of leaf filter residue slurries separate and subside has been carried out, liquid phase N at certain alumina producer leaf filtering process
k170g/l, Al
2o
3187.88g/l, α
k1.49, Gu containing being 80g/L, add polyacrylamide by leaf filter residue amount of solid 0.08 ‰, heavy speed is fast, good compression property, and in 500ml graduated cylinder, sedimentation mud layer interface was by 11 seconds 450ml-350ml used times, supernatant liquor is clarified, and the solvent and solute weight ratio that underflow after 60 minutes is compressed in sedimentation is 3.0; The polyacrylamide added is the polyacrylamide solution prepared, and concentration is 3.46 ‰.
Slaked lime breast in production, admittedly containing 250g/l, the active calcium ion content 90%; By calcium aluminate chemical formula 3CaO.Al
2o
3.6H
2α after O, dealuminzation
kbe 3.5 to calculate slaked lime breast add-on, under temperature of reaction 90 DEG C of conditions, band stir 25 minutes water bath with thermostatic control reaction times and 50 minutes, α
kbe promoted to the result of 3.51,3.55 respectively, dealumination reaction temperature 90 DEG C is described, 25 minutes time reacted.Slip after dealumination reaction carries out press filtration process, and filtrate send decomposition nut liquid groove or vaporizing raw liquor groove, and filter cake turns back to lime silo.
Embodiment 5
The test of leaf filter residue slurries separate and subside has been carried out, liquid phase N at certain alumina producer leaf filtering process
k170g/l, Al
2o
3187.88g/l, α
k1.49, Gu containing being 100g/L, add polyacrylamide by leaf filter residue amount of solid 0.1 ‰, heavy speed is fast, good compression property, and in 500ml graduated cylinder, sedimentation mud layer interface was by 18 seconds 450ml-350ml used times, supernatant liquor is clarified, and the solvent and solute weight ratio that underflow after 60 minutes is compressed in sedimentation is 2.0; The polyacrylamide added is the polyacrylamide solution prepared, and concentration is 3.46 ‰.
Slaked lime breast in production, admittedly containing 250g/l, the active calcium ion content 90%; By calcium aluminate chemical formula 3CaO.Al
2o
3.6H
2α after O, dealuminzation
kbe 3.0 to calculate slaked lime breast add-on, under temperature of reaction 90 DEG C of conditions, band stir water bath with thermostatic control react 20 minutes, 25 minutes, 30 minutes, 35 minutes and 40 minutes after, α
kbe respectively the result of 3.04,3.19,3.17,3.24,3.17, illustrate dealumination reaction temperature 90 DEG C, time 25 ?within 30 minutes minutes, reacted.Slip after dealumination reaction carries out press filtration process, and filtrate send decomposition nut liquid groove or vaporizing raw liquor groove, and filter cake turns back to lime silo.
Embodiment 6
The test of leaf filter residue slurries separate and subside has been carried out, liquid phase N at certain alumina producer leaf filtering process
k170g/l, Al
2o
3187.88g/l, α
k1.49, Gu containing being 81g/L, the solvent and solute weight ratio that sedimentation is compressed to underflow is 3.0;
Slaked lime breast in production, admittedly containing 250g/l, the active calcium ion content 60%; By calcium aluminate chemical formula 3CaO.Al
2o
3.6H
2α after O, dealuminzation
kbe 3.5 to calculate slaked lime breast add-on, under temperature of reaction 60 DEG C of conditions, band stir water bath with thermostatic control react 25 minutes and 50 minutes after, α
kbe promoted to the result of 3.47,3.48 respectively, illustrate dealumination reaction temperature 60 C, 50 minutes time reaction substantially complete.Slip after dealumination reaction carries out press filtration process, and filtrate send decomposition nut liquid groove or vaporizing raw liquor groove, and filter cake turns back to lime silo.
Claims (8)
1. a recoverying and utilizing method for alumina producing middle period filter residue, it is characterized in that its recycling process is that leaf filter residue slurries are carried out solid-liquid separation, isolated feed liquid sends thick liquid bath back to; The underflow of solid-liquid separation is after dealuminzation, press filtration, and filtrate send decomposition nut liquid or vaporizing raw liquor groove, and filter cake turns back to lime batch bin.
2. the recoverying and utilizing method of a kind of alumina producing middle period filter residue according to claim 1, is characterized in that solid-liquid separation process adds polyacrylamide, add-on be leaf filter residue solid masses 0.03% ?0.10 ‰.
3. the recoverying and utilizing method of a kind of alumina producing middle period filter residue according to claim 1, after it is characterized in that solid-liquid separation the solvent and solute weight ratio of underflow be 2 ?3.
4. the recoverying and utilizing method of a kind of alumina producing middle period filter residue according to claim 1, it is characterized in that the dealumination process of the underflow process of solid-liquid separation adds slaked lime breast in solid-liquid separation underflow, slaked lime breast addition by caustic ratio after resultant aluminum hexahydrate acid DFP, reaction reach 2.8 ?3.5 to calculate.
5. the recoverying and utilizing method of a kind of alumina producing middle period filter residue according to claim 2, it is characterized in that the dealumination process of the underflow process of solid-liquid separation 60 DEG C ?at 90 DEG C of temperature, carry out stirring reaction 25 minutes-50 minutes.
6. the recoverying and utilizing method of a kind of alumina producing middle period filter residue according to claim 2, it is characterized in that the underflow of solid-liquid separation adds the solid containing being 200 ± 50g/l of slaked lime breast through dealumination process in solid-liquid separation underflow, the active calcium ion content 60% ?90%.
7. the recoverying and utilizing method of a kind of alumina producing middle period filter residue according to claim 1, is characterized in that its leaf filter residue is that thick liquid leaf filters in journey the filter residue adopting milk of lime or milk of lime to add flyash to produce as flocculating aids.
8. the recoverying and utilizing method of a kind of alumina producing middle period filter residue according to claim 1, and it is characterized in that the slip that its leaf filter residue slurries are made up of the extension mud on seminal fluid and the filter cloth of recoil filter cloth, admittedly contain 30 ?100g/l.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109574052A (en) * | 2019-01-28 | 2019-04-05 | 云南文山铝业有限公司 | The recovery method of sodium aluminate solution filter residue |
| CN114920273A (en) * | 2022-07-06 | 2022-08-19 | 山东南山铝业股份有限公司 | Method for removing high molecular weight organic matters in sodium aluminate solution |
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| CN101607723A (en) * | 2008-06-20 | 2009-12-23 | 中国铝业股份有限公司 | The method of continuously feeding lime into vertical leaf filter used in production of alumina |
| CN104692434A (en) * | 2015-03-06 | 2015-06-10 | 云南文山铝业有限公司 | Method for causticizing sodium carbonate solution by using filter cake |
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2016
- 2016-01-19 CN CN201610031883.1A patent/CN105565349B/en active Active
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|---|---|---|---|---|
| WO2007009374A1 (en) * | 2005-07-18 | 2007-01-25 | China Aluminum International Engineering Corporation Limited | Technique for conveying and filtering red mud |
| CN101607723A (en) * | 2008-06-20 | 2009-12-23 | 中国铝业股份有限公司 | The method of continuously feeding lime into vertical leaf filter used in production of alumina |
| CN104692434A (en) * | 2015-03-06 | 2015-06-10 | 云南文山铝业有限公司 | Method for causticizing sodium carbonate solution by using filter cake |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109574052A (en) * | 2019-01-28 | 2019-04-05 | 云南文山铝业有限公司 | The recovery method of sodium aluminate solution filter residue |
| CN114920273A (en) * | 2022-07-06 | 2022-08-19 | 山东南山铝业股份有限公司 | Method for removing high molecular weight organic matters in sodium aluminate solution |
| CN114920273B (en) * | 2022-07-06 | 2023-09-26 | 山东南山铝业股份有限公司 | Method for removing high molecular weight organic matters in sodium aluminate solution |
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Effective date of registration: 20180531 Address after: 450041 No. 82, Jiyuan Road, Zhengzhou District, Henan Co-patentee after: Aluminum Corporation of China Limited Patentee after: Henan Hua Hui Nonferrous Engineering Design Co., Ltd. Address before: 100082 Xizhimen North Street, Haidian District, Haidian District, Beijing Patentee before: Aluminum Corporation of China Limited |