CN102249274A - Method for producing aluminum oxide with alumyte - Google Patents
Method for producing aluminum oxide with alumyte Download PDFInfo
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- CN102249274A CN102249274A CN 201110164576 CN201110164576A CN102249274A CN 102249274 A CN102249274 A CN 102249274A CN 201110164576 CN201110164576 CN 201110164576 CN 201110164576 A CN201110164576 A CN 201110164576A CN 102249274 A CN102249274 A CN 102249274A
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- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 title abstract description 24
- 238000004519 manufacturing process Methods 0.000 title abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 63
- 229910001570 bauxite Inorganic materials 0.000 claims abstract description 41
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 27
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910001388 sodium aluminate Inorganic materials 0.000 claims abstract description 17
- 238000000227 grinding Methods 0.000 claims abstract description 14
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims abstract description 12
- 238000010304 firing Methods 0.000 claims abstract description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 40
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 29
- 239000002994 raw material Substances 0.000 claims description 27
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 13
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 13
- 235000017550 sodium carbonate Nutrition 0.000 claims description 13
- 229910052799 carbon Inorganic materials 0.000 claims description 12
- 229910021502 aluminium hydroxide Inorganic materials 0.000 claims description 11
- 239000010453 quartz Substances 0.000 claims description 11
- 238000001704 evaporation Methods 0.000 claims description 10
- 230000008020 evaporation Effects 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 239000012752 auxiliary agent Substances 0.000 claims description 8
- 239000000571 coke Substances 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 6
- 239000003245 coal Substances 0.000 claims description 2
- 238000013467 fragmentation Methods 0.000 claims description 2
- 238000006062 fragmentation reaction Methods 0.000 claims description 2
- 239000010439 graphite Substances 0.000 claims description 2
- 229910002804 graphite Inorganic materials 0.000 claims description 2
- 239000003077 lignite Substances 0.000 claims description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 claims 1
- 239000011859 microparticle Substances 0.000 claims 1
- 239000011707 mineral Substances 0.000 claims 1
- 235000010755 mineral Nutrition 0.000 claims 1
- 230000002829 reductive effect Effects 0.000 abstract description 7
- 239000010703 silicon Substances 0.000 abstract description 4
- 229910052710 silicon Inorganic materials 0.000 abstract description 4
- 238000004090 dissolution Methods 0.000 abstract description 3
- 238000004062 sedimentation Methods 0.000 abstract description 3
- 238000002156 mixing Methods 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 abstract 2
- 235000019738 Limestone Nutrition 0.000 abstract 1
- 239000006028 limestone Substances 0.000 abstract 1
- 238000003801 milling Methods 0.000 abstract 1
- 238000005245 sintering Methods 0.000 description 23
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 20
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 17
- 239000011734 sodium Substances 0.000 description 15
- 235000012239 silicon dioxide Nutrition 0.000 description 14
- 238000006722 reduction reaction Methods 0.000 description 13
- 239000000377 silicon dioxide Substances 0.000 description 12
- 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 9
- 229910052742 iron Inorganic materials 0.000 description 9
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 9
- 229910052708 sodium Inorganic materials 0.000 description 9
- 235000019739 Dicalciumphosphate Nutrition 0.000 description 8
- 239000001506 calcium phosphate Substances 0.000 description 8
- NEFBYIFKOOEVPA-UHFFFAOYSA-K dicalcium phosphate Chemical compound [Ca+2].[Ca+2].[O-]P([O-])([O-])=O NEFBYIFKOOEVPA-UHFFFAOYSA-K 0.000 description 8
- 229940038472 dicalcium phosphate Drugs 0.000 description 8
- 229910000390 dicalcium phosphate Inorganic materials 0.000 description 8
- 238000005304 joining Methods 0.000 description 6
- 229910001648 diaspore Inorganic materials 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 239000004571 lime Substances 0.000 description 5
- 229910052814 silicon oxide Inorganic materials 0.000 description 5
- 238000004131 Bayer process Methods 0.000 description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 4
- 235000011941 Tilia x europaea Nutrition 0.000 description 4
- 239000003518 caustics Substances 0.000 description 4
- 229960001866 silicon dioxide Drugs 0.000 description 4
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 4
- 229910001948 sodium oxide Inorganic materials 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 229910001679 gibbsite Inorganic materials 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 239000012452 mother liquor Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910001593 boehmite Inorganic materials 0.000 description 2
- 230000002308 calcification Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- -1 hydrogen aluminum oxide Chemical class 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- 235000010627 Phaseolus vulgaris Nutrition 0.000 description 1
- 244000046052 Phaseolus vulgaris Species 0.000 description 1
- KMWBBMXGHHLDKL-UHFFFAOYSA-N [AlH3].[Si] Chemical compound [AlH3].[Si] KMWBBMXGHHLDKL-UHFFFAOYSA-N 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 235000011089 carbon dioxide Nutrition 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000002939 deleterious effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 210000000582 semen Anatomy 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Landscapes
- Manufacture And Refinement Of Metals (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention discloses a method for producing aluminum oxide with alumyte. The method comprises the following steps of: (1) smashing alumyte, adding a reduction aid, calcined soda and lime stone and blending to obtain a mixed green stock; (2) performing milling grinding on the mixed green stock and adding the mixed green stock into a furnace for performing hard fire; (3) dissolving and separating hard fire clinker out to obtain a sodium aluminate solution, and separating red mud from the hard fire clinker by adopting a direct sedimentation method; and (4) purifying the sodium aluminate solution, decomposing and separating aluminum hydrate out, and discharging the red mud. Due to the adoption of the method, the reduced ratio of the clinker is remarkably lowered, the productivity of a clinker kiln is increased, the production cost is greatly lowered, and the discharging amount of red mud is reduced by over 50 percent. The method has the advantages of lower firing temperature and low dissolution rate of silicon, and is particularly suitable for treating ferric alumyte or treating complex polymetallic bauxite; and the siliceous modulus of raw liquor is increased remarkably.
Description
Technical field
The present invention relates to a kind of production method of aluminum oxide, relate in particular to a kind of method of utilizing bauxite into alumina, belong to the production field of aluminum oxide.
Background technology
Estimate the quality of bauxite and not only see its Chemical Composition and the height of alumina silica ratio, also will see the type of bauxite.The content of useful composition aluminum oxide is generally between 45%-75% in the bauxite.Compare with other nonferrous metallic ores, bauxite belongs to rich ore.Silicon-dioxide in the bauxite is that subtraction is produced the most deleterious impurity in the aluminum oxide.The ratio of the weight of aluminum oxide and silicon-dioxide is called the alumina silica ratio of bauxite in the bauxite, and A/S represents with symbol.Alumina silica ratio is high more, illustrates that the content of silicon-dioxide in the ore is few more.Alumina producing requires bauxite aluminium-silicon than high more good more with alumina content, and these two indexs are very big to the influence of alumina producing technico-economical comparison, especially Bayer process.Handle the low bauxite of alumina silica ratio and handle the high bauxite technology of alumina silica ratio and want complicated, and the investment of unit product and cost are all wanted height.
The type of bauxite is bigger to the solubility influence of aluminum oxide.Gibbsite type is soluble in caustic solution most, and boehmite takes second place, the indissoluble of diaspore.Have data to show that with the Australian gibbsite of caustic solution stripping-boehmite mix mode ore deposit stripping temperature be 245 ℃, 115g/l caustic sodium concentration, dissolution time only need 7 minutes.At 245 ℃, under the 240g/l caustic sodium concentration, need 150 minutes with Chinese diaspore type bauxite.If improve about 10 times of production capacity with same volumetrical device processes Australia ore deposit than Chinese ore, and the technico-economical comparison of later production process also had a significant impact.Find out that thus because the ore type difference of bauxite will cause very big difference to the investment and the cost of Bayer process alumina producing, but influence then is not very big to sintering process.
According to the characteristics and the production status of Chinese bauxite resource, Chinese aluminum oxide industry must develop the technology of oneself.The structure of ores gibbsite of bauxite is the loose fines shape more, and diaspore is mainly stone matter bulk.The ore structure has earthy, compact shape and beans roe shape.A lot of colors between bauxite can have from white to the reddish brown.General high the taking on a red color of iron content, the gray that iron is low, tawny and brown.Hardness changes between 1-7.
China's bauxite resource belongs to diaspore type, based in low alumina silica ratio ore, ore is salic and silicon-dioxide is all high, it is low to contain ferric oxide.The alumina silica ratio majority account for more than 60% of ore total amount, and alumina silica ratio is less at the high-quality bauxite more than 10, less than 7% between 4-7.
Four during the last ten years, and China mainly is application and development sintering process and studies and created sintering-Bayer mixed combining method on the basis of sintering process.In China's six big alumina producers, three mixed combining method factories are just arranged, its output has accounted for more than 60% of Chinese aluminum oxide ultimate production, and along with from now on development, integrated process will be occupied conclusive status in Chinese process for making alumina, built and have the Bayer process alumina production line that world-class diaspore is a raw material, the rate of recovery of aluminum oxide and alkaline consumption etc. have also reached advanced level.But Chinese aluminum oxide industry is compared with advanced international standard, also has sizable gap, show that mainly technical equipment and some main economic and technical indices are relatively backward, particularly the energy consumption of production process is too high, automatization level and labour productivity are low, and aluminum oxide output also is difficult to satisfy economic growing needs.
The bayer process process is to use sodium hydroxide solution stripping bauxite under the high temperature in autoclave at present, the molten leaching of hydrated alumina is wherein come, generate sodium aluminate solution, impurity then enters in the residue, in the sodium aluminate solution of thorough separating red mud, add crystal seed, separate out aluminium hydroxide.Mother liquor after the separation returns stripping next batch ore again, just obtains aluminum oxide behind the Aluminium hydroxide roasting.
The alumina technology of sintering process production at present process is: bauxite and a certain amount of soda ash, lime (or Wingdale) are made into furnace charge, control [N]/([A]+[F])=0.9-1.0, [C]/[S]=2.0-2.2, at high temperature carry out sintering, make silicon oxide and calcification synthesize water-fast Dicalcium Phosphate (Feed Grade), ferric oxide and soda ash be combined to can hydrolysis sodium ferrite, and aluminum oxide and soda ash are combined to water-soluble sodium aluminate; During with the stripping of sintered product (grog) water, sodium aluminate enters water, and the sodium ferrite hydrolysis forms ferric oxide.Ferric oxide enters red mud with Dicalcium Phosphate (Feed Grade), just can separate out aluminium hydroxide with the carbonic acid gas decomposition sodium aluminate liquid more later on.Mother liquor behind the separation of hydrogen aluminum oxide is called carbon mother liquid, can return batching again after evaporation.An aluminium hydroxide wherein part is sold as chemical aluminum oxide through class wrapping, and most of aluminium hydroxide promptly gets the product aluminum oxide through roasting.Alkali-lime sinter process is produced aluminum oxide and has preparation, grog sintering, grog stripping, red mud separation and the washing of charge pulp, desiliconizing crude liquid obtained, main production processes such as the seminal fluid carbonating is decomposed, aluminium hydroxide separation and washing, Aluminium hydroxide roasting, mother liquid evaporation.
Though the ferric oxide in the bauxite belongs to inert impurities substantially in the alkaline process alumina producing, but to the consumption of unit product ore and sintering process is produced all influential, same alumina by sintering production at present has certain requirement to the content of ferric oxide in the bauxite.
Sintering process technology shortcoming is high energy consumption at present, simultaneously a large amount of silicon oxide and ferric oxide generation physical reaction when having changed original thing phase character, enter the comprehensive utilization that can not realize bauxite behind the red mud, and produce 1.5-3 red mud doubly and store up, the iron of red mud the inside not only can't effectively utilize
So, must be at Chinese bauxite resource characteristics, new alumina producing novel process is adopted in research,, cuts down the consumption of energy the purpose that reduces production costs to reach the simplification Production Flow Chart.
Summary of the invention
Technical problem to be solved by this invention be overcome that existing sintering process is produced existing energy consumption height in the aluminum oxide method, the red mud quantity discharged is excessive and red mud in effective constituent be difficult to defectives such as effectively utilization, a kind of method of new employing bauxite into alumina is provided, this method has been given full play to the advantage of sintering process, reduce grog reduced ratio and firing temperature, improve the chamotte kiln production capacity, effectively reduce production cost and significantly reduced the red mud quantity discharged.
Technical problem to be solved by this invention is achieved through the following technical solutions:
A kind of method of utilizing bauxite into alumina may further comprise the steps:
(1), with after the bauxite break process, add reduction auxiliary agent, soda ash and Wingdale and prepare burden and obtain mixed raw material;
(2), carry out high temperature in the kiln and burn till joining behind the mixed raw material ore grinding;
(3), high temperature is burnt till grog carry out stripping and separate, obtain sodium aluminate solution; Burn till the grog from high temperature and to adopt direct settling process to separate to obtain red mud;
(4), the sodium aluminate solution purifying treatment, divide to parse aluminium hydroxide; Red mud effluxes.
Wherein, described reduction auxiliary agent is selected from any one or the multiple mixture in graphite, coke, hard coal or the brown coal;
In order to reach better technique effect, with after the bauxite break process, except adding reduction auxiliary agent, soda ash and Wingdale, also add mother liquid evaporation in the step (1); The moiety of described mother liquid evaporation is: N
T: 200-260g/L, AO:20-30g/L, N
C: 170-260g/L.
In the step (1) in the resulting mixed raw material each amounts of components control according to following consumption proportion:
Meter in molar ratio, the add-on of carbon in the reduction auxiliary agent, for the 1.1-1.8 of theoretical mixed carbon comtent doubly; [N]/[A]=[Na
2O]/[Al
2O
3]=2[Na
+]/2[Al
3+]=Na
+: Al
3+=0.9-1.2:1;
[N]/[F]=[Na
2O]/[Fe
2O
3]=2[Na
+]/2[Fe
3+]=Na
+: Fe
3+=0-0.1:1; [C]/[S-S
(quartz)(in the blending ingredients of batching back, calcium oxide and silicon oxide have been deducted the mol ratio of quartzy silicon to]=2.0-2.2; Owing to deducted that part of lime consumption of quartzy silicon bonded, the add-on of the lime adding amount that causes the inventive method when existing sintering process is produced aluminum oxide);
" theoretical mixed carbon comtent " described in the present invention is meant that the molar weight of ferric oxide in the mixed raw material and the molar weight ratio of carbon are 1:1.5.
Ore grinding described in the step (2) is meant wears into the particulate that granularity is the d50=30-120 micron with mixed raw material;
Burn till time control burning zone temperature and be preferably 1000-1200 ℃, more preferably 1050-1150 ℃ carrying out high temperature in the step (2); The clinkering zone time is preferably 0.3-1.5hr, more preferably 0.4-0.8hr.
The present invention with the bauxite fragmentation after, add reductive agent, mother liquid evaporation, soda ash, lime etc. and prepare burden, at high temperature carry out sintering, physical reaction no longer takes place in control monomer silicon oxide, directly enter red mud, ferric oxide generation reduction reaction enters red mud after generating martial ethiops again; And the synthetic water-fast Dicalcium Phosphate (Feed Grade) of silicon oxide in other silicon-aluminum containing material and calcification, and aluminum oxide and soda ash are combined to water-soluble sodium aluminate; During with sintered product (grog) stripping, obtain sodium aluminate solution and reduction red mud from sintering process, after the grog stripping, in the red mud sepn process, need not separate according to the dissolution fluid sedimentation pattern of original sintering process production aluminum oxide, not add flocculation agent, the direct sedimentation of red mud separates.Mother liquor behind the separation of hydrogen aluminum oxide is called carbon mother liquid, can return batching again after evaporation.An aluminium hydroxide wherein part is sold as chemical aluminum oxide through class wrapping, and most of aluminium hydroxide promptly gets the product aluminum oxide through roasting.
The inventive method gained red mud has significantly differently with existing red mud from sintering process on moiety and materialization structure, and it mainly contains Armco magnetic iron and quartz, also contains a spot of sodium white residue and Dicalcium Phosphate (Feed Grade).The inventive method has significantly reduced the grog reduced ratio, improves the chamotte kiln production capacity, and production cost significantly reduces, and the red mud quantity discharged reduces more than 50%.The inventive method firing temperature is lower, and the solubility rate of silicon is low, and the siliceous modulus of thick liquid is remarkable lifting, is specially adapted to the processing of high-iron bauxite or the processing of complex multi-metal bauxite, and is more obvious on cost and technical superiority.
Embodiment
Further describe the present invention below in conjunction with specific embodiment, advantage of the present invention and characteristics will be more clear along with description.But these embodiment only are exemplary, scope of the present invention are not constituted any restriction.It will be understood by those skilled in the art that and down can make amendment or replace without departing from the spirit and scope of the present invention, but these modifications and replacing all fall within the scope of protection of the present invention the details of technical solution of the present invention and form.
Embodiment 1
1, calculates according to the iron oxide composition 13% that bauxite contained, add the reduction coke, according to 1.1 times of required theoretical mixed carbon comtent; Again according to [N]/[A]=0.9, [N/[F]=0, [C]/[S-S
(quartz)The proportioning of]=2.0 adds soda ash, Wingdale is prepared burden, and obtains mixed raw material;
2, mixed raw material ore grinding, control size are the d50=30 micron;
3, carry out high temperature in joining in the kiln behind the mixed raw material ore grinding and burn till, the control burning zone temperature is 1050 ℃ in the raw material sintering process, clinkering zone time control 1.5hr;
4, high temperature burns till grog and carries out stripping and separate, and obtains sodium aluminate solution, and digesting efficiency of alumina reaches 94%, sodium oxide solubility rate 97%.Adopt direct settling process to separate simultaneously and obtain red mud; After testing, mainly contain Armco magnetic iron and quartz in the resulting red mud, also contain a spot of sodium white residue and Dicalcium Phosphate (Feed Grade).
Embodiment 2
1, calculates according to the iron oxide composition 18% that bauxite contained, add the reduction coke, according to 1.8 times of required theoretical mixed carbon comtent; Again according to [N]/[A]=1.2, [N/[F]=0.1, [C]/[S-S
(quartz)The proportioning of]=2.2 adds soda ash, Wingdale is prepared burden, and obtains mixed raw material;
2, mixed raw material ore grinding, control size are the d50=100 micron;
3, carry out high temperature in joining in the kiln behind the mixed raw material ore grinding and burn till, the control burning zone temperature is 1150 ℃ in the raw material sintering process, clinkering zone time control 0.4hr;
4, high temperature burns till grog and carries out stripping and separate, and obtains sodium aluminate solution, and digesting efficiency of alumina reaches 95%, sodium oxide solubility rate 97%.Adopt simultaneously direct settling process separate the reduction red mud from sintering process; After testing, mainly contain Armco magnetic iron and quartz in the resulting red mud, also contain a spot of sodium white residue and Dicalcium Phosphate (Feed Grade).
Embodiment 3
1, calculates according to the iron oxide composition 23% that bauxite contained, add the reduction coke, according to 1.4 times of required theoretical mixed carbon comtent; Again according to [N]/[A]=1.0, [N/[F]=0, [C]/[S-S
(quartz)The proportioning adding soda ash of]=2.1, mother liquid evaporation, Wingdale are prepared burden, and obtain mixed raw material;
2, mixed raw material ore grinding, control size are the d50=120 micron;
3, carry out high temperature in joining in the kiln behind the mixed raw material ore grinding and burn till, the control burning zone temperature is 1100 ℃ in the raw material sintering process, clinkering zone time control 1.0hr;
4, high temperature burns till grog and carries out stripping and separate, and obtains sodium aluminate solution, and digesting efficiency of alumina reaches 93%, sodium oxide solubility rate 95%.Adopt simultaneously direct settling process separate the reduction red mud from sintering process; After testing, mainly contain Armco magnetic iron and quartz in the resulting red mud, also contain a spot of sodium white residue and Dicalcium Phosphate (Feed Grade).
Embodiment 4
1, calculates according to the iron oxide composition 13% that bauxite contained, add the reduction coke, according to 1.6 times of required theoretical mixed carbon comtent; Again according to [N]/[A]=1.1, [N/[F]=0 .05, [C]/[S-S
(quartz)The proportioning adding soda ash of]=2.1, mother liquid evaporation, Wingdale are prepared burden, and obtain mixed raw material;
2, mixed raw material ore grinding, control size are the d50=80 micron;
3, carry out high temperature in joining in the kiln behind the mixed raw material ore grinding and burn till, carry out high temperature in joining in the kiln behind the mixed raw material ore grinding to burn till, the control burning zone temperature is 1150 ℃ in the raw material sintering process, clinkering zone time control 0.8hr;
4, high temperature burns till grog and carries out stripping and separate, and obtains sodium aluminate solution, and digesting efficiency of alumina reaches 96%, sodium oxide solubility rate 98%.Adopt simultaneously direct settling process separate the reduction red mud from sintering process; After testing, mainly contain Armco magnetic iron and quartz in the resulting red mud, also contain a spot of sodium white residue and Dicalcium Phosphate (Feed Grade).
Claims (10)
1. method of utilizing bauxite into alumina may further comprise the steps:
(1), the bauxite of fragmentation being added reduction auxiliary agent, soda ash and Wingdale prepares burden and obtains mixed raw material;
(2), burn till carrying out high temperature behind the mixed raw material ore grinding;
(3), high temperature is burnt till grog carry out stripping and separate, obtain sodium aluminate solution; High temperature is burnt till the grog separation obtain red mud;
(4), the sodium aluminate solution purifying treatment, divide to parse aluminium hydroxide; Red mud effluxes.
2. it is characterized in that in accordance with the method for claim 1: the auxiliary agent of reduction described in the step (1) is selected from any one or the multiple mixture of forming by arbitrary proportion in graphite, coke, hard coal or the brown coal.
3. in accordance with the method for claim 1, it is characterized in that: with after the bauxite break process, except adding reduction auxiliary agent, soda ash and Wingdale, also add mother liquid evaporation in the step (1).
4. in accordance with the method for claim 3, it is characterized in that the composition of described mother liquid evaporation comprises: N
T: 200-260g/L, AO:20-30g/L, N
C: 170-260g/L.
5. according to any one described method of claim 1-4, it is characterized in that: in the step (1) in the resulting mixed raw material each amounts of components control according to following mole proportioning:
The add-on of carbon in the reduction auxiliary agent, for the 1.1-1.8 of theoretical mixed carbon comtent doubly; [N]/[A]=0.9-1.2; [N/[F]=0-0.1; [C]/[S-S
(quartz)]=2.0-2.2.
6. it is characterized in that in accordance with the method for claim 1: the ore grinding described in the step (2) is meant wears into the mineral microparticle that granularity is the d50=30-120 micron with mixed raw material.
7. in accordance with the method for claim 1, it is characterized in that: carrying out high temperature when burning till in the step (2), the control burning zone temperature is 1000-1200 ℃.
8. in accordance with the method for claim 7, it is characterized in that: carrying out high temperature when burning till in the step (2), the control burning zone temperature is 1050-1150 ℃.
9. in accordance with the method for claim 1, it is characterized in that: carrying out high temperature when burning till in the step (2), firing time is 0.3-1.5hr.
10. in accordance with the method for claim 9, it is characterized in that: carrying out high temperature when burning till in the step (2), firing time is 0.4-0.8hr.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103553099A (en) * | 2013-11-15 | 2014-02-05 | 中国铝业股份有限公司 | Settling and separating method of aluminum oxide clinker dissolved-out red mud |
| CN104445313A (en) * | 2014-10-30 | 2015-03-25 | 北京矿冶研究总院 | Method for extracting aluminum oxide from fly ash by acid-base combination |
| CN105540627A (en) * | 2016-01-19 | 2016-05-04 | 中国铝业股份有限公司 | Preparation method for clinker of alumina produced by sintering process |
| CN105776267A (en) * | 2016-02-06 | 2016-07-20 | 杭州锦江集团有限公司 | Method for producing aluminum oxide by means of granulating and sintering of low-grade bauxite |
| CN110482581A (en) * | 2019-09-19 | 2019-11-22 | 中国铝业股份有限公司 | A kind of technique of the sintering process production aluminium oxide suitable for Australia's mine |
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| CN101413054A (en) * | 2008-12-09 | 2009-04-22 | 中南大学 | Technology for comprehensively utilizing high ferro aluminiferous material |
| CN101875129A (en) * | 2010-06-08 | 2010-11-03 | 中南大学 | Method for comprehensive utilization of high-iron bauxite |
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| CN101413054A (en) * | 2008-12-09 | 2009-04-22 | 中南大学 | Technology for comprehensively utilizing high ferro aluminiferous material |
| CN101875129A (en) * | 2010-06-08 | 2010-11-03 | 中南大学 | Method for comprehensive utilization of high-iron bauxite |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103553099A (en) * | 2013-11-15 | 2014-02-05 | 中国铝业股份有限公司 | Settling and separating method of aluminum oxide clinker dissolved-out red mud |
| CN104445313A (en) * | 2014-10-30 | 2015-03-25 | 北京矿冶研究总院 | Method for extracting aluminum oxide from fly ash by acid-base combination |
| CN104445313B (en) * | 2014-10-30 | 2016-03-02 | 北京矿冶研究总院 | Method for extracting aluminum oxide from fly ash by acid-base combination |
| CN105540627A (en) * | 2016-01-19 | 2016-05-04 | 中国铝业股份有限公司 | Preparation method for clinker of alumina produced by sintering process |
| CN105776267A (en) * | 2016-02-06 | 2016-07-20 | 杭州锦江集团有限公司 | Method for producing aluminum oxide by means of granulating and sintering of low-grade bauxite |
| CN110482581A (en) * | 2019-09-19 | 2019-11-22 | 中国铝业股份有限公司 | A kind of technique of the sintering process production aluminium oxide suitable for Australia's mine |
| CN110482581B (en) * | 2019-09-19 | 2022-03-25 | 中国铝业股份有限公司 | Process for producing alumina by sintering method suitable for Australia mine |
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