CN105236458A - Method for the calcination of aluminium trihvdroxide - Google Patents
Method for the calcination of aluminium trihvdroxide Download PDFInfo
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- CN105236458A CN105236458A CN201510537457.0A CN201510537457A CN105236458A CN 105236458 A CN105236458 A CN 105236458A CN 201510537457 A CN201510537457 A CN 201510537457A CN 105236458 A CN105236458 A CN 105236458A
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- water vapor
- calcinations
- aluminium hydroxide
- hydroxide
- aluminum
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- 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
- C01F7/44—Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water
- C01F7/447—Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water by wet processes
- C01F7/448—Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water by wet processes using superatmospheric pressure, e.g. hydrothermal conversion of gibbsite into boehmite
-
- 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
- C01F7/44—Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water
- C01F7/441—Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water by calcination
Abstract
A method for the calcination of aluminium trihydroxide, the method comprising the steps of: directly contacting the aluminium trihydroxide with steam; and calcining at least a portion of the aluminium trihydroxide to alumina and/or aluminium oxyhydroxide.
Description
The divisional application that present patent application is priority date is on October 30th, 2006, denomination of invention is No. 200780040596.6th, the Chinese invention patent application (international patent application no is PCT/AU2007/001617) of " method for the production of aluminum oxide ".
Technical field
The present invention relates to a kind of method for calcinations of aluminum hydroxide.More specifically, the present invention relates to a kind of method utilizing water vapor calcinations of aluminum hydroxide.
Background technology
Bayer process (Bayerprocess) is widely used in from aluminous ore, as bauxite prepares aluminum oxide.The method comprises: in the operation being commonly referred to digestion, and salic ore is at high temperature contacted with the caustic aluminate solution of recirculation.
After being cooled by solution, add aluminium hydroxide as crystal seed, to impel from wherein precipitating more aluminium hydroxide.By the aluminium hydroxide of precipitation, also referred to as hydrate or gibbsite, be separated from caustic aluminate solution, wherein by a part of aluminium hydroxide recirculation to be used as crystal seed, and residuum to be reclaimed as product.By remaining caustic aluminate solution recirculation, with the salic ore of other digestion.According to the method for being separated with aluminate solution by aluminium hydroxide, the aluminium hydroxide of recovery may not be complete drying, and may containing water that is unconjugated and physical bond.In the context of the present specification, the non-Bound moisture of term refers to can water on the surface of alchlor, and the water of term physical bond refer to can be contained in such as alchlor gap between water in hole.
In the operation being called calcining, by the heating aluminum hydroxide of recovery to prepare aluminum oxide.Except removing the water carried secretly, when aluminium hydroxide generates the alchlor (Al also referred to as aluminum oxide according to following reaction
2o
3) time, water or the by product of calcination reaction:
2Al(OH)
3→Al
2O
3+3H
2O
Calcination reaction can prepare various difference and measurable aluminiferous structure.These comprise alchlor structural form and aluminum oxyhydroxide structural form.The preferred composition of smelter grade alumina mainly containing so-called γ type, but also containing other alumina phase (such as, α, κ, χ etc.) a large amount of.
In the context of the present specification, term aluminum oxide is appreciated that all structural forms or phase that comprise alchlor, comprises gamma-alumina.In the context of the present invention, term aluminum oxyhydroxide is appreciated that all structural forms or phase that comprise aluminum oxyhydroxide, comprises boehmite.
In the context of the present specification, term calcining is appreciated that to comprise removing wholly or in part and enters the water and unconjugated water that the physics and chemistry in calcining furnace combines together with aluminium hydroxide charging.
The successive stage of calcining is:
Drying, to remove the water of unconjugated water and physical bond;
Heat in stove, to remove chemically combined water; With
Product cools.
Calcining is energy intensive method.The water (~ 0.53t water/tA) discharged from aluminium hydroxide with water vapor form in the process of calcining is lost to air together with its calorific potential (~ 1.2GJ/tA) by flue.Other water is also to be released in air from the form of water vapor of the unconjugated water entering calcining furnace together with aluminium hydroxide charging and the product that carrys out auto-combustion.
In prior art systems, a large amount of fuel is used to the aluminium hydroxide evaporating unconjugated water and heat drying, thus its arrival final needed for be oxidized al species before through a series of intermediate crystal form.
Static Calcination stove, kiln formula calcining furnace, resistive heating, deep fat or salt bath is used, by the combustion heating of inductance, laser, plasma body, microwave radiation and fuel for being comprised with the direct heat transfer equipment and method that form alumina product and water vapor by dry for aluminium hydroxide Sum decomposition.
In flash distillation (flash) and kiln formula method for calcinating, the combustion gases from the stove portion of calcining furnace mix with by upright the connecing of hydrate of calcining.After firing, such as, by for catching the cyclonic separator of dust and rod-curtain precipitator by gas delivery.Stack gas is the product of burning and the mixture of water vapor.
US5336480 teaches the calcinations of aluminum hydroxide by heating aluminum hydroxide indirect in pressurizing vessel, and collects the water vapor of release.This specification sheets teaches when heating owing to discharging water vapor by decomposing from aluminium hydroxide, and the bed of aluminium hydroxide shows gravity flow voltinism.
According to US5336480, by heating aluminum hydroxide in splitter the water of unconjugated water, physical bond and some chemically combined water to be dispersed from aluminium hydroxide, produce the water vapor for the digestor and evaporator section being supplied to Bayer process.More specifically, in pipe, hot waste gas indirect heating aluminium hydroxide is passed through.The water of releasing with gaseous state in pipe upwards flows, and it is said the grain bed fluidisation made in pipe.Because fluidized gas is from particle itself, so this is called as self-fluidized type.In start-up course, it is grain fluidized that the water vapor from auxiliary water vapour source may be used for making in pipe, until realize self-fluidized type.
Advantageously, the present invention allows to utilize less pressurized vessel, and the method for US5336480 needs large pressurized vessel; Result causes relatively low gas side (gas-side) heat transfer coefficient.Large size comprises for other consequence of this device the needs and the difficulty relevant to the solid that distributes equably that regulate thermal expansion.
The aforementioned discussion of background of the present invention is intended to promote the understanding of the present invention.But will be appreciated that this discussion is not approved or admits the priority date in the application, any material mentioned is all a part for the common sense in Australia.
In whole specification sheets, unless the context requires otherwise, otherwise word " comprises " or such as " comprise " or the change of " containing " is appreciated that and means to comprise described integer (integer) or integer group, but does not get rid of other integer any or integer group.
In whole specification sheets, unless the context requires otherwise, otherwise word " water vapor " be appreciated that and comprise solid carbon dioxide steam (not being contained in water vapor mechanics keeping the water suspended), est steam (water vapor containing keeping the water suspended), saturated vapor (being in the water vapor under the boiling temperature corresponding with its pressure) or superheated vapour (being heated to above the water vapor of the temperature of the boiling point corresponding with its pressure).
Other definition to selected term used herein can be found in describing the invention, and be applicable in full.Unless otherwise defined, otherwise other Science and Technology terms all used herein have understood identical implication usual with those skilled in the art.
Summary of the invention
Those skilled in the art will be appreciated that the present invention described herein is easy to carry out and specifically described those different changes and amendments.Should be appreciated that and the present invention includes all this changes and amendment.The present invention also comprise the institute that mentions separately or jointly in the description or point out in steps, feature, composition and compound, and any and all combinations or any step described in two or more or feature.
Scope of the present invention is not by the restriction being intended to only exemplary specific embodiments described herein.In the scope of the present invention that the product of function equivalence, composition and method are obviously described in this article.
The full content of all publications (comprising patent, patent application, journal of writings, laboratory manual, books or other document) quoted herein is combined in this by reference.Comprise not being equal to and admit that any reference forms prior art or a part for the common sense of those skilled in the relevant art of the present invention.
According to the present invention, a kind of method for calcinations of aluminum hydroxide is provided, said method comprising the steps of:
Aluminium hydroxide is directly contacted with water vapor; With
Aluminum oxide and/or aluminum oxyhydroxide will be sintered into by aluminium hydroxide at least partially,
Wherein from described calcining at least partially described in described aluminium hydroxide, obtain described water vapor at least partially.
Will be appreciated that and can provide aluminum oxide and aluminum oxyhydroxide with various structures form.
When not limit by theory, it is believed that the present invention may be used for controlling the aluminum oxide of preparation and the structural form of aluminum oxyhydroxide like this.
Preferably, described method comprises following other step:
Described aluminium hydroxide is heated by making described aluminium hydroxide directly contact with water vapor.
Preferably, described method comprises following other step:
Make before described aluminium hydroxide directly contacts with described water vapor, processing the water vapor that obtains to improve its temperature and/or pressure.
Will be appreciated that the temperature and pressure of water vapor determines that whether water vapor is containing any liquid water carried secretly.
The temperature of water vapor is preferably at least about 250 DEG C.When not limit by theory, it is believed that by increasing water vapor supplying temperature, reducing the amount of steam obtaining the required degree of decomposing.More preferably, the temperature of water vapor is about 480 DEG C.When not limit by theory, it is believed that calcining furnace may need the structure be made up as nickel-chromium alloy of SPECIAL MATERIAL when the temperature of water vapor is higher than about 480 DEG C.In a kind of mode very preferably of the present invention, the temperature of water vapor is higher than 480 DEG C.
Preferably, the pressure of water vapor is greater than normal atmosphere.In a kind of mode very preferably of the present invention, the pressure of water vapor is greater than about 6 bar.
Preferably, the pressure and temperature leaving the water vapor of roasting assembly is applicable to utilizing in bauxite refinery in addition.In a kind of mode very preferably of the present invention, the pressure leaving the water vapor of roasting assembly is greater than about 6 bar.
Advantageously, use the water vapor being in high pressure to mean and can produce with the temperature and pressure being suitable for utilizing further in refinery the water vapor produced from calcination process.In addition, the water vapor being in high pressure is used also to reduce to calcine the physical size of required equipment.
When not limit by theory, it is believed that the energy of aluminium hydroxide thermolysis needed for aluminum oxide and/or aluminum oxyhydroxide with pressure raise and reduce.
Preferably, described water vapor is superheated vapour.
In a kind of mode of the present invention, described method comprises following other step:
When there is described aluminium hydroxide, the mixture of described aluminium hydroxide and aluminum oxide and aluminum oxyhydroxide is carried out the second calcination stage.
The step that the mixture of described aluminium hydroxide and described aluminum oxide and aluminum oxyhydroxide carries out the second calcination stage can be undertaken by any method known in the art, comprise the dinectly bruning using combustion fuel gas, the indirect calcination using combustion fuel gas, the dinectly bruning using water vapor, the indirect calcination using water vapor, sun power, resistance and microwave calcination.
Preferably, the step of the mixture of described aluminium hydroxide and described aluminum oxide and aluminum oxyhydroxide being carried out the second calcination stage is carried out in independently roasting assembly.
When the second calcination stage comprises the dinectly bruning using combustion fuel gas, the second calcination stage can carry out in gas suspension calciner.
Will be appreciated that, the temperature of the second calcination stage will be determined by required aluminum oxide product characteristics.Such as, the aluminum oxide becoming known for ceramic applications needs the calcining temperature of about 1250 DEG C, and carries out at about 850 to 1100 DEG C for the preparation of the conventional alumina calcining of smelter grade alumina.It is believed that the second calcination stage can carry out in lower temperature.
Preferably, the temperature of the second calcination stage between about 600 and 950 DEG C is carried out.
When not limit by theory, it is believed that the calcining of direct water vapor produces one or more aluminium oxide structures different from the aluminium oxide structure produced in the Conventional calcination of first stage.
When described method comprise the mixture of aluminium hydroxide and aluminum oxide and aluminum oxyhydroxide is carried out the step of the second calcination stage, described method preferably includes following other step: reclaim heat from described second calcination stage.
In a kind of mode of the present invention, reclaim the step of heat from described second calcination stage and comprise: reclaim heat in the boiler, to produce and the step of hot water and steam again.
Preferably, this water vapor is utilized in the step making described aluminium hydroxide and water vapor directly contact.
Preferably, described method comprises following other step:
Aluminium hydroxide described in preheating.
In a kind of mode of the present invention, the step of aluminium hydroxide described in preheating is carried out with the step making described aluminium hydroxide and water vapor directly contact simultaneously.
In the second way of the present invention, the step of aluminium hydroxide described in preheating was carried out before the step making described aluminium hydroxide and water vapor directly contact.
Preferably, described method comprises following other step:
Dry described aluminium hydroxide.
In a kind of mode of the present invention, the step of dry described aluminium hydroxide is carried out with the step making described aluminium hydroxide and water vapor directly contact simultaneously.
In the second way of the present invention, the step of dry described aluminium hydroxide was carried out before the step making described aluminium hydroxide and water vapor directly contact.
Advantageously, the step of Aluminium Hydroxide can reduce energy expenditure.
In a kind of mode of the present invention, described method comprises following other step:
Before the step making described aluminium hydroxide and water vapor directly contact, make described aluminium hydroxide dehydration.
Preferably, the step of described aluminium hydroxide dehydration is comprised:
Make the step that described aluminium hydroxide dewaters in pressure filter, it can comprise use water vapor.
Will be appreciated that when water vapor is utilized subsequently in the factory, may need to process described water vapor to remove the particle such as carried secretly.
Accompanying drawing explanation
Now by means of only embodiment, present invention is described for a reference one embodiment and accompanying drawing, in the accompanying drawings:
Fig. 1 is the indicative flowchart of display Bayer process flow process (circuit); And
Fig. 2 shows the indicative flowchart that how method according to the present invention can be used in Bayer process flow process.
Embodiment
One of ordinary skill in the art appreciates that the present invention described in the present invention easily carries out and specifically described those different changes and amendments.Be to be understood that and the present invention includes all this changes and amendment.The present invention also comprise the institute that mentions separately or jointly in the description or point out in steps, feature, composition and compound, and any and all combinations or any step described in two or more or feature.
Fig. 1 shows the indicative flowchart of the refinery's Bayer process flow process 10 adopting single digestion flow process, and this Bayer process flow process 10 comprises the following steps:
By bauxite 14 digestion 12 in caustic solution;
Be residue 18 and liquid 20 by mixture liquid-solid separation 16;
Aluminium hydroxide precipitates 24 from liquid 20;
Be separated aluminium hydroxide 24 and liquid 26; And
Aluminium hydroxide 24 is calcined 31 one-tenth aluminum oxide 30 and water 32.
See best in fig. 2, according to the present invention, aluminium hydroxide 24 is fed in pipe, and by directly contacting with about 480 to 650 DEG C and the water vapor 34 that is greater than 6 bar and heated.Water vapor 34 heats and Aluminium Hydroxide 24.Water vapor 34 and the mixing of aluminium hydroxide 24 cause chemically combined water to discharge with the water vapor form relevant to energy level available in mixed flow.The water vapor of the release obtained mixes with heating steam 34.
Heat exchange between aluminium hydroxide 24 and water vapor 34 makes partial aluminum hydroxide 24 decompose, and provides the mixture 36 of aluminium hydroxide, aluminum oxyhydroxide and various alumina form according to the temperature of recycled water steam and the outlet temperature of solid.The decomposition of aluminium hydroxide 24 causes the increase of the water vapor mass flow 38 leaving mixed phase.Adding sufficient water vapor makes mixture temperature be about 300 DEG C.Gas/solid isolation technique is adopted to be separated with solid 36 by water vapor 38 as filtered.Calcine by pressure the total energy caused to reduce to be by using the water vapor of release to carry out as production water vapor.
The water vapor 38 of separation is divided into two streams 40 and 42.Stream 40 arrives water vapor reheater 46 by recycling fan 44 via stream 48, is heated to about 480 to 650 DEG C and returns as stream 34, and mixing with other aluminium hydroxide 24.
Be actually the condition being cooled to plant water steam from the stream 42 of water of aluminium hydroxide release, this adds 50 by water to produce other water vapor 52, and be discharged to by water vapor and realize in plant water steam flow.
Solid 36 from gas/solid separating step passes to gas suspension calciner (GSC) 54 at approximate atmospheric pressing operation from the pressure period, and here they are heated to about 850 DEG C to obtain target product quality.
Hot gas 56 from GSC54 is used in water vapor reheater 46 with recirculation temp recycled water steam 48 being heated to about 480 to 650 DEG C.Due to thermal equilibrium, may need to add fuel 58 to water vapor reheater 46.Add water 60 so that hot air discharge was being reclaimed heat further before flue 61 from hot gas.
Before discharging as product 68, with the aluminum oxide 62 of cooling air 64 and water coolant 66 cooling heat.Therefore, cooling air 64 was preheated before arriving GSC54 through 70.
Fuel 72 (such as, gas or oil) is added in GSC54 to keep required temperature.
Current 66,60 can required to be used for various object in thermally equilibrated factory.Such as, the water of heating may be used for cooling produce water vapor (that is, as stream 50) or these current may be used for supplementary recycled water vapour stream 34.
In the gas suspension calciner of routine, the product from the burning of calcination stage is used to dry and preheating aluminium hydroxide.The product of burning also for providing part counterflow heat exchange in calcining portion.When the present invention adopts the second calcination stage utilized from the products of combustion of gas suspension calciner, products of combustion can not provide part counterflow heat exchange in calcining portion.Therefore, as shown in Figure 2, the water vapor needed for reheat pressure calcining portion is used to from the products of combustion of the second calcination stage.Temperature due to gas suspension calciner is about 850 DEG C, so the energy of available abundance may be there is no to provide all water vapors in the product of burning, and may need to provide other fuel and air to provide the heat needed for recycled water steam reheating.
As shown in Figure 2, water vapor passes through water vapor reheater 46 from the recirculation of pressure calcination stage.In order to obtain suitable thermal equilibrium, need the water vapor of 480 to 650 DEG C of significant quantity.In order to provide sufficient heat to pressure calcining portion, water vapor should be recycled, and in the process done like this, the temperature in that water vapor enters water vapor reheater is low in fact as far as possible.
Another problem is, according to the degree of decomposition reached in the first pressure stage, can consume less energy in gas suspension room.When degree of decomposition height in the pressure stage, in subordinate phase by needing less energy, therefore need less air, thus do not have sufficient air to be cooled to by aluminum oxide enough low temperature to be discharged into travelling belt etc.Therefore, heat must be reclaimed from the product of part cooling, and this also can be in the form of producing water vapor or heating boiler feed water.
Will be appreciated that, many heat recovery equipments to may be used for from aluminum oxide in addition by waste heat recovery to the normal flue temperature in the scope of 150 DEG C.All these heat recovery equipments can be single waste heat boilers with regional.
Embodiment of the present invention utilize the unitized design of indoor model, evaluation and improvement based on chemical industry First Principles, and be adjusted to the ASPENPlus of the physical properties routine package (package) with the present art
tMthe mass data storehouse of the existing Bayer device operation of setting up in ASPEN Technology Co., Ltd. software processes simulation software, Bayer character and thermodynamic data, Bayer operating experience and flow chart model, comprise the Bayer process character of increase and inner device operation of setting up.
Will be appreciated that following the provided data about flow and temperature are specific for used model and embodiment, and the impact of parameter by input model.
The practical application that research has highlighted the calcining of direct water vapor can prepare in the plant water steam of about 0.39 tonne, PMT (Per metric ton) aluminum oxide (0.32 tonne directly from the decomposition of aluminium hydroxide, and other 0.07 tonne of water vapor from feed material 4.5% unconjugated water).It should be pointed out that water vapor from waste heat recovery is not included in the water vapor of the generation of above-mentioned 0.39 tonne.
When whole Bound moisture was removed in the pressure period, obtain the water vapor of the maximum produced, but the condition of required water vapor and flow make this be unpractical.Preliminary research has highlighted (see table 1) in the performance obtaining near optimal when the Bound moisture of about 60% is released in pressure calcining portion from the decomposition of aluminium hydroxide, and when the factory for the alumina producing amount with 100tph provides following result, obtain actual minimum limit.
The plant water steam 32tph produced is 8 bar (definitely) and 220 DEG C
In conventional gas suspension calcining furnace operating, produce aluminum oxide with the benchmark of about 3.0GJ/t (for Shao Qi factory), and produce water vapor with about 2.57GJ/t.Therefore, utilize current equipment to produce aluminum oxide and the water vapor of par, the energy of consumption is:
Therefore, the energy producing above-mentioned water vapor is reduced to 2.57*0.39=1.0GJ/t aluminum oxide
Based on above-mentioned calculating, the invention provides the remarkable potentiality reducing plant capacity cost.
Although highlighted significant saving above-mentioned, expection can obtain more saving by further optimizing.
Table 1 below shows the result from data and process modeling.In each case, the target water steam condition leaving factory from system is 8 bar pressures and 220 DEG C.
Table 1. data and process modeling result.
3GJ/tAl is about with for burning device of air energy consumption
2o
3the conventional gas suspension calcining stove of (be 2.9 for oil firing device) is compared, and above-mentionedly shows significant energy saving.
Save and need to add that the contrast preparing the energy of the water vapor of equivalent in conventional boiler operation is evaluated as the energy preparing aluminum oxide in Conventional calcination stove.
Utilizing wherein by directly contacting with water vapor, being counted the model of the water vapor of 0.39 tonne by the aluminum oxide of PMT (Per metric ton) from pressure stage preparation by feed hydrogen aluminum oxide, the water vapor that 100tph calcining furnace will need recirculation to be about about 650 DEG C of 248tph.The diameter of main heat exchanger tube is about 1.3m, and target velocity is 10ms
-1.For in the conventional gas suspension calcining stove of 100tph factory, typically have a diameter from about 2.7m.In addition, subordinate phase equipment is also less.Will be appreciated that, compared with conventional gas suspension calcining stove technology, the present invention utilizes less equipment.The recirculation of a large amount of high-temperature water vapors is considered to by using turbine to realize best.Turbine will be appreciated that because should have clean water vapor, so may need filtering water vapor.
Calculating and demonstrate, utilizing the calcining of direct steam heating to have by producing the potentiality reclaiming the energy of about 1GJ/t aluminum oxide by the production water vapor of PMT (Per metric ton) aluminum oxide up to 0.39 tonne.
Claims (26)
1., for a method for calcinations of aluminum hydroxide, said method comprising the steps of:
Aluminium hydroxide is directly contacted with water vapor, and the temperature of wherein said water vapor is at least about 250 DEG C; With
Described aluminium hydroxide is sintered into aluminum oxide and/or aluminum oxyhydroxide at least partially,
Wherein from described calcining at least partially described in described aluminium hydroxide, obtain described water vapor at least partially.
2. the method for calcinations of aluminum hydroxide according to claim 1, wherein said method comprises following other step:
Described aluminium hydroxide is heated by making described aluminium hydroxide directly contact with water vapor.
3., according to the method for calcinations of aluminum hydroxide of claim 1 or claim 2, wherein said method comprises following other step:
Make before described aluminium hydroxide directly contacts with described water vapor, processing the water vapor that obtains to improve its temperature and/or pressure.
4., according to the method for calcinations of aluminum hydroxide of arbitrary aforementioned claim, the temperature of wherein said water vapor is at least about 480 DEG C.
5. according to the method for calcinations of aluminum hydroxide of arbitrary aforementioned claim, the temperature of wherein said water vapor about 480 DEG C to 650 DEG C between.
6., according to the method for calcinations of aluminum hydroxide of arbitrary aforementioned claim, the pressure of wherein said water vapor is greater than normal atmosphere.
7., according to the method for calcinations of aluminum hydroxide of arbitrary aforementioned claim, the pressure of wherein said water vapor is greater than about 6 bar.
8., according to the method for calcinations of aluminum hydroxide of arbitrary aforementioned claim, the pressure wherein leaving the water vapor of roasting assembly is greater than about 6 bar.
9., according to the method for calcinations of aluminum hydroxide of arbitrary aforementioned claim, wherein said water vapor is superheated vapour.
10., according to the method for calcinations of aluminum hydroxide of arbitrary aforementioned claim, wherein said method comprises following other step:
When there is described aluminium hydroxide, the mixture of described aluminium hydroxide and aluminum oxide and aluminum oxyhydroxide is carried out the second calcination stage.
11. methods for calcinations of aluminum hydroxide according to claim 10, wherein carry out the step of the second calcination stage by using the dinectly bruning of combustion fuel gas, using the indirect calcination of combustion fuel gas, use the dinectly bruning of water vapor, using the indirect calcination of water vapor, sun power, resistance and microwave calcination and carry out by the mixture of described aluminium hydroxide and described aluminum oxide and aluminum oxyhydroxide.
12. according to the method for calcinations of aluminum hydroxide of claim 10 or claim 11, and the step of wherein mixture of described aluminium hydroxide and described aluminum oxide and aluminum oxyhydroxide being carried out the second calcination stage is carried out in independently roasting assembly.
13. according to claim 10 to the method for calcinations of aluminum hydroxide any one of 12, and wherein said second calcination stage carries out in gas suspension calciner.
14. methods for calcinations of aluminum hydroxide according to claim 13, wherein said second calcination stage carries out at about 850 DEG C.
15. according to claim 10 to the method for calcinations of aluminum hydroxide any one of 14, and wherein said method comprises following other step:
Heat is reclaimed from described second calcination stage.
16. methods for calcinations of aluminum hydroxide according to claim 15, the step wherein reclaiming heat from described second calcination stage comprises:
Reclaim heat in the boiler, to produce and the step of hot water and steam again.
17. methods for calcinations of aluminum hydroxide according to claim 16, wherein utilize this water vapor in the step making described aluminium hydroxide and water vapor directly contact.
18. according to the method for calcinations of aluminum hydroxide of arbitrary aforementioned claim, and wherein said method comprises following other step:
Aluminium hydroxide described in preheating.
19. methods for calcinations of aluminum hydroxide according to claim 18, wherein the step of aluminium hydroxide described in preheating is carried out with the step making described aluminium hydroxide and water vapor directly contact simultaneously.
20. methods for calcinations of aluminum hydroxide according to claim 18, wherein the step of aluminium hydroxide described in preheating was carried out before the step making described aluminium hydroxide and water vapor directly contact.
21. according to the method for calcinations of aluminum hydroxide of arbitrary aforementioned claim, and wherein said method comprises following other step:
Dry described aluminium hydroxide.
22. methods for calcinations of aluminum hydroxide according to claim 21, wherein the step of dry described aluminium hydroxide is carried out with the step making described aluminium hydroxide and water vapor directly contact simultaneously.
23. methods for calcinations of aluminum hydroxide according to claim 21, wherein the step of dry described aluminium hydroxide was carried out before the step making described aluminium hydroxide and water vapor directly contact.
24. according to the method for calcinations of aluminum hydroxide of arbitrary aforementioned claim, and wherein said method comprises following other step:
Before the step making described aluminium hydroxide and water vapor directly contact, make described aluminium hydroxide dehydration.
25. methods for calcinations of aluminum hydroxide according to claim 24, wherein make the step of described aluminium hydroxide dehydration comprise:
Make the step that described aluminium hydroxide dewaters in pressure filter, it can comprise use water vapor.
26. as the method for calcinations of aluminum hydroxide that describes with reference to the accompanying drawings above.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2006906025A AU2006906025A0 (en) | 2006-10-30 | Method for Alumina Production | |
| AU2006906025 | 2006-10-30 | ||
| CNA2007800405966A CN101595057A (en) | 2006-10-30 | 2007-10-24 | Be used for the production method of alumina |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007800405966A Division CN101595057A (en) | 2006-10-30 | 2007-10-24 | Be used for the production method of alumina |
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| CN105236458A true CN105236458A (en) | 2016-01-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510537457.0A Pending CN105236458A (en) | 2006-10-30 | 2007-10-24 | Method for the calcination of aluminium trihvdroxide |
| CNA2007800405966A Pending CN101595057A (en) | 2006-10-30 | 2007-10-24 | Be used for the production method of alumina |
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| CNA2007800405966A Pending CN101595057A (en) | 2006-10-30 | 2007-10-24 | Be used for the production method of alumina |
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| CN (2) | CN105236458A (en) |
| AU (1) | AU2007314134B2 (en) |
| BR (1) | BRPI0718257B1 (en) |
| WO (1) | WO2008052249A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109065810A (en) * | 2018-08-15 | 2018-12-21 | 寿光众新晶体材料有限公司 | A kind of preparation method of aluminum oxyhydroxide slurry |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103771476B (en) * | 2014-01-26 | 2015-07-08 | 郑州金阳光陶瓷有限公司 | Method for producing alpha-aluminum oxide by utilizing gas-suspension roasting furnace |
| CN109612298A (en) * | 2018-12-27 | 2019-04-12 | 广西华银铝业有限公司 | A kind of pre-heating system convenient for recovered steam steam exhaust heat |
| WO2021144694A1 (en) * | 2020-01-13 | 2021-07-22 | Rio Tinto Alcan International Limited | Calcination apparatus and process using hydrogen |
| IL303311A (en) | 2020-11-30 | 2023-07-01 | Rondo Energy Inc | Energy storage system and applications |
| US11913361B2 (en) | 2020-11-30 | 2024-02-27 | Rondo Energy, Inc. | Energy storage system and alumina calcination applications |
| US11913362B2 (en) | 2020-11-30 | 2024-02-27 | Rondo Energy, Inc. | Thermal energy storage system coupled with steam cracking system |
| CN117980683A (en) * | 2021-06-17 | 2024-05-03 | 阿德莱德大学 | Method and device for calcining alumina |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5141734A (en) * | 1983-11-07 | 1992-08-25 | Aluminum Company Of America | Steam producing process |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1646990A1 (en) * | 1988-10-03 | 1991-05-07 | Всесоюзный Научно-Исследовательский И Проектно-Конструкторский Институт Металлургической Теплотехники И Огнеупоров "Внииэнергоцветмет" | Unit for calcination of aluminium hydroxide |
| RU2064893C1 (en) * | 1993-10-27 | 1996-08-10 | Акционерное общество "Богословский алюминиевый завод" | Method of isolation of aluminium hydroxide from aluminate solution |
| RU2092438C1 (en) * | 1996-03-06 | 1997-10-10 | Химический факульткт МГУ им.М.В.Ломоносова | Method of preparing fine crystalline corundum |
| JP3665186B2 (en) * | 1997-08-21 | 2005-06-29 | 仲道 山崎 | Continuous hydrothermal synthesis of alumina particles |
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2007
- 2007-10-24 CN CN201510537457.0A patent/CN105236458A/en active Pending
- 2007-10-24 WO PCT/AU2007/001617 patent/WO2008052249A1/en active Application Filing
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5141734A (en) * | 1983-11-07 | 1992-08-25 | Aluminum Company Of America | Steam producing process |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109065810A (en) * | 2018-08-15 | 2018-12-21 | 寿光众新晶体材料有限公司 | A kind of preparation method of aluminum oxyhydroxide slurry |
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| Publication number | Publication date |
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| AU2007314134A1 (en) | 2008-05-08 |
| BRPI0718257B1 (en) | 2021-02-17 |
| AU2007314134B2 (en) | 2013-11-07 |
| BRPI0718257A2 (en) | 2014-01-21 |
| WO2008052249A9 (en) | 2008-07-17 |
| CN101595057A (en) | 2009-12-02 |
| WO2008052249A1 (en) | 2008-05-08 |
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