CN106032285B - A kind of recovery method of aluminum oxide - Google Patents
A kind of recovery method of aluminum oxide Download PDFInfo
- Publication number
- CN106032285B CN106032285B CN201510112638.9A CN201510112638A CN106032285B CN 106032285 B CN106032285 B CN 106032285B CN 201510112638 A CN201510112638 A CN 201510112638A CN 106032285 B CN106032285 B CN 106032285B
- Authority
- CN
- China
- Prior art keywords
- alkali
- solution
- aluminium
- alcohol
- hydroxide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention discloses a kind of recovery method of aluminum oxide, this method includes：Waste residue containing aluminum i ndustry and/or associated minerals containing aluminium are carried out after dissolution processing in the solution of containing alcohol alkali, washing, desiliconization removal of impurities processing, crystallization treatment and calcination process is sequentially passed through, has obtained aluminum oxide.The alumina recovery method of the present invention is compared with existing alumina recovery method, with higher alumina recovery rate and relatively low energy consumption.
Description
Technical field
The present invention relates to a kind of recovery method of aluminum oxide.
Background technology
Chinese bauxite resource is very short, and China is to account for the oxygen that the resource reserve in the world 3% maintains the world about 30%
Change aluminium output, resource consumption is very serious, ensure the time limit less than 10 years；In addition, the bauxite resource of high-quality is also extremely short,
Alumina/silica mass ratio (A/S) accounts for the 60% of gross reserves for 4-6 middle and low grade bauxite.Therefore, China especially pay attention to from containing
The technical research of aluminum oxide is reclaimed in aluminum i ndustry waste residue and associated minerals containing aluminium.
Current China is broadly divided into alkaline process and acid from waste residue containing aluminum i ndustry or containing the method that aluminum oxide is reclaimed in the rawore of aluminium half
Method, wherein alkaline process have pyrogenic process and wet method, and acid system has ammonium sulfate method and hydrochloric acid method.
● alkaline process
Alkaline process is (to be produced with reference to process for making alumina by bauxite), is slightly improved.Pyrogenic process and wet method difference
Roasting method and Bayer process in correspondence alumina technology.The substantially technique of pyrogenic process be by Aluminiferous waste slag or associated minerals high-temperature roasting,
Al is activated, the solidification of other impurities element, then fired slags are leached Al with alkali lye, and recrystallization obtains Al (OH)3, by Al (OH)3
Al is obtained after roasting2O3.Wet method is substantially that high-concentration alkali liquor is leached, and then crystallization obtains crude sodium aluminate/potassium, then by crude sodium aluminate/
Potassium is dissolved in sig water, is recrystallized after removal of impurities, is obtained Al (OH)3, by Al (OH)3Al is obtained after roasting2O3。
Contain substantial amounts of Si in general Aluminiferous waste slag or associated minerals, and Al and Si have certain dissolving in aqueous slkali
Degree, therefore, impurity Si separation is alkali method process design focal point.In pyrogenic process, because Si is calcined solidification, so in pyrogenic process Al and
Si separation rate is that comparison is high, therefore, has a large amount of patents to be used for alum recovery, such as CN201110117710.9 using this method.
But, because the sintering temperature of roasting method is higher, energy consumption is 2-4 times of Bayer process, does not have economy in aluminum oxide industry,
Gradually it is eliminated.And Al content is generally significantly less than bauxite in Aluminiferous waste slag and associated minerals, therefore, contained using pyrogenic process to handle
Waste slag of aluminum or associated minerals, it is also difficult to economical.
Bayer process is the prevailing technology of current alumina producing, but is equally to be limited by separation Si impurity, is only applicable to A/S
Higher mineral, because Si and Al can form more stable insoluble matter in alkali lye, except Si can cause Al to lose, and substantially
Upper removal Si can lose equimolar Al.In order to avoid such case, there are document and patent using crystallizing twice to reduce alkali lye
In Si contents, lost with the Al reduced except Si processes, i.e. hydrometallurgic recovery aluminum oxide, such as CN201010565571.1 and
CN200810102216.3.But, the concentration of alkali lye differs greatly in two sections of crystallizations, and alkali lye is to recycle in wet method,
So each circulation is directed to the dilution and evaporation of alkali lye, and energy consumption is very big, substantially suitable with roasting method；And high-alkali part
Alkali concn is very high, often leads to the seriously corroded of evaporation equipment and the leaching equipment of high-alkali part.
Therefore, in alkaline process no matter pyrogenic process or wet method, the problem of due to energy consumption and equipment corrosion, it is difficult on a large scale should
With.
● acid system
Si is the major impurity of Aluminiferous waste slag or associated minerals, and Si is insoluble in an acidic solution, in addition, general Aluminiferous waste slag
Or half Fe contents in rawore it is also fewer, so, have document and patent and aluminum oxide reclaimed using acid system, acid system is divided into ammonium sulfate
Method and hydrochloric acid method.
The general step of ammonium sulfate method is that first ammonium sulfate is incorporated in Aluminiferous waste slag or associated minerals to be calcined, then will roasting
Slag leaches the solution for obtaining sulfur acid aluminium ammonium, and the solution obtains refined aluminum ammonium sulfate solution by being redissolved after crystallization, so
Ammonia, which is passed through, in backward solution obtains Al (OH)3And ammonium sulfate.By Al (OH)3Al is obtained after roasting2O3；Ammonium sulfate
After evaporation, continue cycling through and use.Related patent such as CN200910187282.x and CN200710118679.4 etc..
The drawbacks of this method is present has：Moisture evaporation amount is big when the 1st, reclaiming ammonium sulfate；2nd, ammonia loss amount is big in course of reaction,
Timing is needed to mend ammonia；3rd, the rate of recovery of aluminium is low.
Aluminiferous waste slag or associated minerals are leached with hydrochloric acid solution, the solution crystallization of formation obtains AlCl3Solid, solid is fired
Hydrochloric acid and thick aluminum oxide are obtained, hydrochloric acid reuse, the process step of thick aluminum oxide is crystallized after being leached to Bayer process similar-alkali substantially.
Related patent such as CN201110103782.8 and CN201010294267.8 etc..
This method be related to simultaneously acid, alkali, during inevitably acid-base neutralization cause acid, alkali loss amount it is big；In addition,
AlCl3Roasting is reclaimed during hydrochloric acid, serious corrosion can be caused to roaster and subsidiary conduit, the requirement to material is very high.
The content of the invention
It is an object of the invention to provide a kind of recovery method of aluminum oxide, this method is handled from work containing aluminium using wet method dissolution
Aluminum oxide is reclaimed in industry waste residue and/or associated minerals containing aluminium, the solvent handled using the solution of containing alcohol alkali as dissolution improves oxygen
Change the rate of recovery of aluminium and reduce the energy consumption in removal process.
To achieve these goals, the present invention provides a kind of recovery method of aluminum oxide, and this method includes：
A, waste residue containing aluminum i ndustry and/or associated minerals containing aluminium are subjected to dissolution processing with the solution of containing alcohol alkali and filtered, obtained
Filtrate and the filter residue containing aluminium；The solution of the containing alcohol alkali is the alcoholic solution of alkali metal containing alkoxide or the alcohol and water of alkali metal containing alkoxide
Solution；
B, the filter residue of gained in step a washed and filtered with the aqueous solution of alkali, obtain thick richness aluminium liquid and slag；
C, the thick rich aluminium liquid progress desiliconization removal of impurities processing by gained in step b, obtain smart rich aluminium liquid and white residue；
D, the essence richness aluminium liquid progress crystallization treatment by gained in step c, obtain crystalline mother solution and aluminium hydroxide；
E, the aluminium hydroxide progress calcination process by gained in step d, obtain aluminum oxide.
Preferably, wherein, the matter of the alumina/silica of waste residue containing aluminum i ndustry described in step a and/or the associated minerals containing aluminium
Amount is than being 0.6~1.5.The waste residue containing aluminum i ndustry is selected from flyash, red mud, coal gasification lime-ash, aluminium ash, FCC poising agents and coal
At least one of spoil, the associated minerals containing aluminium are selected from least one of kaolin, clay and dawsonite.
Preferably, wherein, alcohol described in step a described in the solution of containing alcohol alkali is selected from C1-C4 monohydric alcohol and C2-C4
At least one of polyalcohol；Alkali metal alcoholates and C2-C4 polyalcohol of the alkali metal alcoholates selected from C1-C4 monohydric alcohols
At least one hydroxyl hydrogen atom replaced by alkali metal atom obtained by least one of alkoxide.
Preferably, wherein, alcohol described in step a described in the solution of containing alcohol alkali is methanol and/or ethanol, the alcohol alkali
Selected from least one of sodium methoxide, potassium methoxide, caustic alcohol and potassium ethoxide.
Preferably, wherein, the solution of the containing alcohol alkali described in step a by alkali metal oxide or alkali metal hydroxide with
Alcohol reaction is made, or reacts obtained by the mixed liquor of alkali metal oxide or alkali metal hydroxide and alcohol and water.
Preferably, wherein, dissolution described in step a processing condition include：The temperature of dissolution processing is 160-300 DEG C,
The time of dissolution processing is 15-300 minutes, and the volume of the solution of the containing alcohol alkali is with the waste residue containing aluminum i ndustry and/or containing aluminium
The ratio between gross mass of associated minerals be 4-10 liters/kilogram, in the solution of the containing alcohol alkali total concentration of alkali metal be 1-12 mol/Ls
And the ratio between volume of water and alcohol is less than 3:7.
Preferably, wherein, dissolution described in step a processing condition include：The temperature of dissolution processing is 210-260 DEG C,
The time of dissolution processing is 90-150 minutes, and the volume of the solution of the containing alcohol alkali is with the waste residue containing aluminum i ndustry and/or containing aluminium
The ratio between gross mass of associated minerals be 5-8 liters/kilogram, in the solution of the containing alcohol alkali total concentration of alkali metal be 2-6 mol/Ls simultaneously
And the ratio between the volume of water and alcohol is less than 1：4.
Preferably, wherein, this method also includes：Using in step a gained filtrate as the containing alcohol alkali solution extremely
Few a part of reuse (return) is into dissolution processing.
Preferably, wherein, this method also includes：The reuse is carried out again after solid silicea is added in the filtrate, or
Directly added in the solution of the containing alcohol alkali after solid silicea, then carry out the dissolution processing.
Preferably, wherein, the aqueous solution of alkali described in step b is the aqueous solution of sodium hydroxide and/or potassium hydroxide.
Preferably, wherein, the condition washed described in step b includes：Wash temperature is 40-80 DEG C, and wash time is 10-
40 minutes；In terms of the quality of oxide, the concentration of alkali is 90-130 g/l in the aqueous solution of the alkali；The aqueous solution of the alkali
Volume and the filter residue mass ratio for 1.5-3 liters/kilogram.
Preferably, wherein, this method also includes：Described take off is carried out to the thick rich aluminium liquid using solid silicea in step c
Silicon removal of impurities is handled.
Preferably, wherein, the solid silicea is the oxide and/or hydroxide of calcic；Solid silicea described in step a
Addition is the waste residue containing aluminum i ndustry and/or the 1-5 mass % of the quality of associated minerals containing aluminium.
Preferably, wherein, the condition of crystallization treatment is described in step d：The temperature of crystallization treatment is 30-50 DEG C, crystallization
The time of processing is 60-120 hours, and the concentration of alkali is 70-100 g/l in essence richness aluminium liquid during crystallization treatment, and crystal seed coefficient is
1.5-2。
Preferably, wherein, using in step d gained crystalline mother solution be used as at least one of the aqueous solution of alkali described in step b
Part is back to use in the washing.
The alumina recovery method of the present invention, due to using dissolution handle waste residue containing aluminum i ndustry and/or associated minerals containing aluminium and
Two Liquid Phases circulation technology, with higher desilication efficiency, improves the rate of recovery of aluminum oxide；In addition, being followed using Two Liquid Phases
Ring avoids the alkali concn fluctuation of conventional wet list liquid phase circulation, reduces evaporation energy consumption.
Other features and advantages of the present invention will be described in detail in subsequent embodiment part.
Brief description of the drawings
Accompanying drawing is, for providing a further understanding of the present invention, and to constitute a part for specification, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings：
Fig. 1 is a kind of schematic flow sheet of embodiment of alumina recovery method of the present invention；
Fig. 2 is the XRD spectra that the embodiment of the present invention uses red mud；
Fig. 3 is to be reclaimed using the method for the present invention in alumina process, the filter obtained by red mud is carried out after dissolution processing
The XRD spectra (i.e. the XRD of the gained filter residue of embodiment 3) of slag.
Embodiment
The embodiment of the present invention is described in detail below in conjunction with accompanying drawing.It should be appreciated that this place is retouched
The embodiment stated is merely to illustrate and explain the present invention, and is not intended to limit the invention.
According to the present invention, the waste residue containing aluminum i ndustry and associated minerals containing aluminium are well-known to those skilled in the art, steps
The mass ratio of the alumina/silica of waste residue containing aluminum i ndustry and/or the associated minerals containing aluminium described in rapid a can be 0.6~1.5, example
Such as, waste residue containing aluminum i ndustry described in step a can be selected from flyash, red mud, coal gasification lime-ash, aluminium ash, FCC poising agents and coal
At least one of spoil, the associated minerals containing aluminium can be selected from least one of kaolin, clay and dawsonite.
According to the present invention, the solution of the containing alcohol alkali for the alcoholic solution of alkali metal containing alkoxide or the alcohol of alkali metal containing alkoxide and
The solution of water, refers to the class compound that the hydroxyl hydrogen atom in alcohol is formed after being replaced by alkali metal atom, and alcohol therein can be with
The number for being the hydroxyl hydrogen atom being substituted in monohydric alcohol or polyalcohol, polyalcohol can be one, or multiple.Step
The solution of containing alcohol alkali described in a can be reacted by alkali metal oxide or alkali metal hydroxide with alcohol to be made, or can be by
The mixed liquor reaction of alkali metal oxide or alkali metal hydroxide and alcohol and water is made.Preferably, containing alcohol alkali described in step a
Solution described in alcohol can be selected from C1-C4 monohydric alcohol and C2-C4 at least one of polyalcohol；Described alkali metal
The alkali metal alcoholates and at least one hydroxyl hydrogen atom of C2-C4 polyalcohols that alkoxide can be selected from C1-C4 monohydric alcohols are by alkali metal
At least one of alkoxide obtained by atom substitution；It is further preferred that the alcohol described in step a described in the solution of containing alcohol alkali
Can be methanol and/or ethanol, the alcohol alkali can be selected from least one of sodium methoxide, potassium methoxide, caustic alcohol and potassium ethoxide.
The present inventor according to the salt containing aluminium solubility is low in the solution of containing alcohol the characteristics of, aluminum i ndustry waste residue will be contained
And/or associated minerals containing aluminium carry out dissolution processing in the solution of containing alcohol alkali.The dissolution processing refers in the solution of containing alcohol alkali
The crystal structure of waste residue containing aluminum i ndustry and/or the associated minerals containing aluminium is destroyed, is difficult to so as to be formed in the solution of containing alcohol alkali
Dissolution and the component containing aluminium for being easy to dissolution in the aqueous solution of alkali, reach the alumina recovery effect similar with roasting method but oxidation
Energy consumption during alum recovery is less than Bayer process again.Wherein, the condition of the processing of dissolution described in step a can include：At dissolution
The temperature of reason is 160-300 DEG C, and the time of dissolution processing is 15-300 minutes, and the volume of the solution of the containing alcohol alkali contains with described
The ratio between gross mass of aluminum i ndustry waste residue and/or the associated minerals containing aluminium (liquid-solid ratio can be referred to as) be 4-10 liters/kilogram, the containing alcohol
The total concentration of alkali metal is that the ratio between 1-12 mol/Ls and the volume of water and alcohol are less than 3 in the solution of alkali:7；Described in step a
The optimum condition of dissolution processing can include：The temperature of dissolution processing is 210-260 DEG C, and the time of dissolution processing is 90-150 points
Clock, the ratio between the volume and the waste residue containing aluminum i ndustry of the solution of the containing alcohol alkali and/or the gross mass of the associated minerals containing aluminium are 5-8
Rise/kilogram, the total concentration of alkali metal is that the ratio between 2-6 mol/Ls and the volume of water and alcohol are less than in the solution of the containing alcohol alkali
2:8。
According to the present invention, waste residue containing aluminum i ndustry and/or silicon and aluminium in associated minerals containing aluminium are difficult molten after being handled due to dissolution
The composition of the solution of containing alcohol alkali does not produce too big change to solution in alcoholic solution, therefore after dissolution processing, therefore, it can step
During the filtrate of gained is handled as at least a portion reuse (recycling) of the solution of the containing alcohol alkali to the dissolution in a.
Preferably, the reuse is carried out again after solid silicea can be added in the filtrate, or can be directly in the containing alcohol alkali
Added in solution after solid silicea, then carry out the dissolution processing.The solid silicea be it is well-known to those skilled in the art, mainly
It, for precipitating a small amount of silicon containing component being dissolved in alkali lye, can be the oxide and/or hydroxide of calcic that effect, which is,；Step
The addition of solid silicea described in a can be the waste residue containing aluminum i ndustry and/or the 1-5 mass % of the weight of associated minerals containing aluminium.
According to the present invention, the aqueous solution of alkali is well-known to those skilled in the art described in step b, as long as can be from filter
The aqueous solution that the alkali of Aluminum is washed in slag can be used, for example, can be the aqueous solution of sodium hydroxide and/or potassium hydroxide.Step
The condition washed described in rapid b can be determined according to wash conditions conventional in the prior art, for example, the condition of the washing
It can include：Wash temperature is 40-80 DEG C, and wash time is 10-40 minutes；In terms of the quality of oxide, the alkali it is water-soluble
The concentration of alkali is 90-130 g/l in liquid；The volume of the aqueous solution of the alkali and the mass ratio of the filter residue (can also be referred to as
For liquid-solid ratio) be 1.5-3 liters/kilogram.
It will be appreciated by persons skilled in the art that this method can also include：By in step b gained the slag and
The white residue of gained is used for the preparation of construction material in step c, and the present invention is repeated no more.
According to the present invention, desiliconization removal of impurities described in step c processing be it is well-known to those skilled in the art, can be in step
The desiliconization removal of impurities is carried out to the thick rich aluminium liquid using solid silicea in c to handle, the solid silicea can with it is used solid in step a
Silicea is identical, the siliceous modulus in thick rich aluminium liquid is promoted to more than 200.Siliceous modulus described herein is those skilled in the art
Known, it is the mass ratio of aluminum oxide and silica in solution.Furthermore it is also possible to which the alkali concn for reducing the aqueous solution of alkali enters
Row desiliconization is handled, and may be referred to the desiliconization removal step of the prior art such as Bayer process and treatment conditions, in the life of existing sintering process
Also used during production aluminum oxide, the present invention is repeated no more.
According to the present invention, crystallization treatment described in step d is well-known to those skilled in the art, can add hydroxide
Aluminium crystal seed is passed through carbon dioxide, can also directly cool down dilution crystallization, aluminium hydroxide crystal seed is cold present invention preferably employs adding
But dilution crystallization.Because the temperature of washing of the present invention is relatively low, the condition of crystallization treatment is gentleer described in step d, example
Such as can be：The temperature of crystallization treatment is 30-50 DEG C, and the time of crystallization treatment is 60-120 hours, essence richness aluminium during crystallization treatment
The concentration of alkali is 70-100 g/l in liquid, and crystal seed coefficient is 1.5-2, wherein the crystal seed coefficient is those skilled in the art institute
It is well known, for the ratio of alumina content and alumina content in solution in addition crystal seed.In addition, the present invention can also be by step
The crystalline mother solution of gained is back to use in the washing as at least a portion of the aqueous solution of alkali described in step b in d, is returned
Crystalline mother solution can be adjusted before, for example, add alkali or carry out removal of impurities, make up to the water of step b residue washing alkali
The standard of solution.
According to the present invention, calcination process described in step e is well-known to those skilled in the art, and general sintering temperature can
Think 950-1100 DEG C, roasting time can be 15-30 hours, and the present invention is repeated no more.
The method of the present invention will be further detailed by embodiment below, but therefore do not limit this hair
It is bright.Instrument and equipment used is routine instrument device in prior art unless otherwise instructed.
Following examples are tested using red mud, flyash, FCC poising agents and coal gasification lime-ash, and what is be related to is above-mentioned
Raw material chemical element composition using x ray fluorescence spectrometry according to YS/T575.23-2009 standard methods (《Bauxite petrochemical industry
Learn analysis method》, the Ministry of Industry and Information Technology of the People's Republic of China (PRC) writes, issue on December 4th, 2009) determine, composition difference
As shown in table 1-4.The XRD spectrum of red mud is as shown in Fig. 2 XRD spectra uses Philips XPERT Series X-ray powder diffractions
Instrument, test condition is：Co K alpha rays (λ=0.17903nm), Fe wave filters, voltage 40kV, electric current 30mA, scanning range is 5-
70°。
The rate of recovery computational methods of aluminum oxide are：The quality of alumina recovery rate=alumina product/(waste residue containing aluminum i ndustry
And/or in quality × waste residue containing aluminum i ndustry of the associated minerals containing aluminium and/or associated minerals containing aluminium aluminum oxide content) × 100%.
Embodiment 1-7 provides the embodiment and result of the alumina recovery method of the present invention.
Embodiment 1
Allocate the solution of containing alcohol alkali by a certain percentage with ethanol, potassium hydroxide and water, wherein, second alcohol and water by volume 9:
1 proportional arrangement, potassium hydroxide reaches that 6mol/L amount is added by the concentration of potassium in the solution for making containing alcohol alkali.
Broken, the levigate flyash to less than 80 μm is added in the solution of deployed containing alcohol alkali, makes containing alcohol alkali
The volume of solution and the mass ratio of flyash are 5 liters/kilogram (liquid-solid ratio).Then dissolution handles 150min at 210 DEG C.Dissolution
Processing is filtered after terminating, and obtains filtrate and filter residue.
Filtrate after making each parameter consistent with the solution of containing alcohol alkali, is back to by filling into appropriate potassium hydroxide, second alcohol and water
Flyash dissolution is handled.Filter residue is washed with the aqueous solution of alkali, and the aqueous solution of alkali is water-soluble for concentration 130g/L potassium hydroxide
Liquid, the volume of the aqueous solution of alkali and the mass ratio of filter residue are 1.5 liters/kilogram (liquid-solid ratio), and 40min is washed at 40 DEG C.Washing
Filtered after end, obtain thick rich aluminium liquid and slag.
Thick richness aluminium liquid adds solid silicea calcium oxide and carries out desiliconization removal of impurities, make solution by adjusting alkali concn to after 100g/L
Siliceous modulus reaches 300, then obtains smart rich aluminium liquid and white residue.White residue and slag are together outer to be arranged, and is used as construction material.Essence
Rich aluminium liquid obtains aluminium hydroxide and crystalline mother solution by crystallization, and crystallization temperature is 50 DEG C, and crystallization time is 70 hours, smart during crystallization
The concentration of alkali is 100 g/l, crystal seed coefficient 1.5 in rich aluminium liquid.Crystalline mother solution makes the aqueous solution of each parameter and alkali by adjustment
After consistent, residue washing is back to；Aluminium hydroxide is by 950 DEG C, and the roasting of 30 minutes obtains aluminum oxide.
The rate of recovery of aluminum oxide is up to 62 mass % in the embodiment.
Embodiment 2
The solution of containing alcohol alkali is allocated with sodium methoxide and methanol, sodium methoxide is reached by the concentration of sodium in the solution for making containing alcohol alkali
2mol/L amount is added.
Broken, the levigate flyash to less than 80 μm is added in the solution of deployed containing alcohol alkali, makes containing alcohol alkali
The volume of solution and the mass ratio of flyash are 8 liters/kilogram (liquid-solid ratio).Then dissolution handles 90min under the conditions of 260 DEG C.
Dissolution processing is filtered after terminating, and obtains filtrate and filter residue.
Filtrate after making each parameter consistent with the solution of containing alcohol alkali, is back to fine coal by filling into proper amount of methanol sodium and methanol
Grey dissolution processing.Filter residue is washed with the aqueous solution of alkali, and the aqueous solution of alkali is concentration 90g/L sodium hydrate aqueous solution, the water of alkali
The volume of solution and the mass ratio of filter residue are 3 liters/kilogram (liquid-solid ratio), and 10min is washed at 80 DEG C.Washing is filtered after terminating,
Obtain thick rich aluminium liquid and slag.
Thick richness aluminium liquid adds solid silicea calcium oxide and carries out desiliconization removal of impurities, make solution silicon by adjusting alkali concn to after 70g/L
Volume index reaches 300, then obtains smart rich aluminium liquid and white residue.White residue and slag are together exclusive and are used as construction material.Essence
Rich aluminium liquid obtains aluminium hydroxide and crystalline mother solution, 30 DEG C of crystallization temperature, crystallization time 60 hours, essence richness aluminium during crystallization by crystallization
Alkali concn in liquid is 70g/L, crystal seed coefficient 2.Crystalline mother solution after making each parameter consistent with the aqueous solution of alkali, is returned by adjustment
It is back to residue washing；Aluminium hydroxide is by 1100 DEG C, and the roasting of 15 minutes obtains aluminum oxide.
The rate of recovery of aluminum oxide is up to 69 mass % in the embodiment.
Embodiment 3
The solution of containing alcohol alkali is allocated with methanol, sodium hydroxide and water, wherein, first alcohol and water by volume 7:3 ratio is matched somebody with somebody
Put, sodium hydroxide reaches that 12mol/L amount is added by the concentration of sodium in the solution for making containing alcohol alkali；And add in the solution of containing alcohol alkali
Enter solid silicea calcium oxide, Gu the addition of silicea is 1 mass % of follow-up red mud addition.
Broken, the levigate red mud to less than 80 μm is added in the solution of deployed containing alcohol alkali, makes the molten of containing alcohol alkali
The volume of liquid and the mass ratio of red mud are 7 liters/kilogram (liquid-solid ratio).Then dissolution handles 15min under the conditions of 240 DEG C.Dissolution
Processing is filtered after terminating, and obtains filtrate and filter residue.Shown in filter residue XRD spectrum Fig. 3.
Filtrate makes each parameter consistent with the solution of containing alcohol alkali and adds solid silicon by filling into proper amount of methanol, sodium hydroxide, water
After agent calcium oxide, red mud dissolution processing is back to.Filter residue is washed with the aqueous solution of alkali, and the aqueous solution of alkali is concentration 120g/L hydrogen
Aqueous solution of sodium oxide, the volume of the aqueous solution of alkali and the mass ratio of filter residue are 2.5 liters/kilogram (liquid-solid ratio), are washed at 70 DEG C
30min.Washing is filtered after terminating, and obtains thick rich aluminium liquid and slag.
Thick richness aluminium liquid adds solid silicea calcium oxide and carries out desiliconization removal of impurities, make solution silicon by adjusting alkali concn to after 90g/L
Volume index reaches 300, then obtains smart rich aluminium liquid and white residue.White residue and slag are together exclusive and are used as construction material.Essence
Rich aluminium liquid obtains aluminium hydroxide and crystalline mother solution, 40 DEG C of crystallization temperature, crystallization time 70 hours, essence richness aluminium during crystallization by crystallization
Alkali concn in liquid is 90g/L, crystal seed coefficient 1.7, and crystalline mother solution is by adjustment, after making each parameter consistent with the aqueous solution of alkali,
It is back to residue washing；Aluminium hydroxide is by 1000 DEG C, and the roasting of 25 minutes obtains aluminum oxide.
Alumina recovery rate is up to 61 mass % in the embodiment.
Embodiment 4
The solution of containing alcohol alkali is allocated with ethanol, sodium hydroxide, sodium hydroxide is reached by the concentration of sodium in the solution for making containing alcohol alkali
Amount to 4mol/L is added.
Broken, the levigate red mud to less than 80 μm is added in the solution of deployed containing alcohol alkali, makes the molten of containing alcohol alkali
The volume of liquid and the mass ratio of red mud are 7 liters/kilogram (liquid-solid ratio).Then dissolution handles 300min under the conditions of 240 DEG C.Dissolution
Processing is filtered after terminating, and obtains filtrate and filter residue.
Filtrate is by filling into ethanol in proper amount, sodium hydroxide, after making each parameter consistent with the solution of containing alcohol alkali, adds follow-up red
After 5 mass % of mud addition solid silicea calcium hydroxide, red mud dissolution processing is back to.Filter residue is washed with the aqueous solution of alkali,
The aqueous solution of alkali is concentration 120g/L sodium hydrate aqueous solution, the volume of the aqueous solution of alkali and the mass ratio of filter residue be 2.5 liters/
Kilogram (liquid-solid ratio), 30min is washed at 70 DEG C.Washing is filtered after terminating, and obtains thick rich aluminium liquid and slag.
Thick richness aluminium liquid adds solid silicea calcium oxide and carries out desiliconization removal of impurities, make solution silicon by adjusting alkali concn to after 90g/L
Volume index reaches 300, then obtains smart rich aluminium liquid and white residue.White residue and slag are together exclusive and are used as construction material.Essence
Rich aluminium liquid obtains aluminium hydroxide and crystalline mother solution, 40 DEG C of crystallization temperature, crystallization time 70 hours, essence richness aluminium during crystallization by crystallization
Alkali concn in liquid is 90g/L, crystal seed coefficient 2.Crystalline mother solution after making each parameter consistent with the aqueous solution of alkali, is returned by adjustment
It is back to residue washing；Aluminium hydroxide is by 1000 DEG C, and the roasting of 25 minutes obtains aluminum oxide.
The rate of recovery of aluminum oxide is up to 65 mass % in the embodiment.
Embodiment 5
The solution of containing alcohol alkali is allocated with butanol, sodium hydroxide, sodium hydroxide is reached by the concentration of sodium in the solution for making containing alcohol alkali
Amount to 4mol/L is added；And silicea calcium hydroxide is consolidated in addition in the solution of containing alcohol alkali, Gu the addition of silicea is follow-up FCC
3 mass % of poising agent addition.
Broken, levigate to less than 80 μm FCC poising agents are added in the solution of deployed containing alcohol alkali, make containing alcohol alkali
The mass ratio of volume and FCC poising agents of solution be 7 liters/kilogram (liquid-solid ratio).Then dissolution is handled under the conditions of 240 DEG C
120min.Dissolution processing is filtered after terminating, and obtains filtrate and filter residue.
Filtrate makes each parameter consistent with the solution of containing alcohol alkali and adds solid silicea by filling into appropriate butanol, sodium hydroxide
After calcium hydroxide, FCC poising agents dissolution processing is back to.Filter residue is washed with the aqueous solution of alkali, and the aqueous solution of alkali is concentration 120g/
L sodium hydrate aqueous solution, the volume of the aqueous solution of alkali and the mass ratio of filter residue are 2.5 liters/kilogram (liquid-solid ratio), at 70 DEG C
Wash 30min.Washing is filtered after terminating, and obtains thick rich aluminium liquid and slag.
Thick richness aluminium liquid adds solid silicea sodium oxide molybdena and carries out desiliconization removal of impurities, make solution by adjusting alkali concn to after 90g/L
Siliceous modulus reaches 300, then obtains smart rich aluminium liquid and white residue.White residue and slag are together exclusive and are used as construction material.
Smart richness aluminium liquid obtains aluminium hydroxide and crystalline mother solution, 40 DEG C of crystallization temperature, crystallization time 70 hours, essence richness during crystallization by crystallization
Alkali concn in aluminium liquid is 90g/L, crystal seed coefficient 1.7.Crystalline mother solution makes each parameter consistent with the aqueous solution of alkali by adjustment
Afterwards, it is back to residue washing；Aluminium hydroxide is by 1000 DEG C, and the roasting of 25 minutes obtains aluminum oxide.
The rate of recovery of aluminum oxide is up to 50 mass % in the embodiment.
Embodiment 6
The solution of containing alcohol alkali is allocated with ethanol, sodium oxide molybdena, sodium oxide molybdena is reached by the concentration of sodium in the solution for making containing alcohol alkali
1mol/L amount is added.
Broken, levigate to less than 80 μm coal gasification lime-ash are added in the solution of deployed containing alcohol alkali, make containing alcohol
The volume of the solution of alkali is 4 liters/kilogram (liquid-solid ratio) with the mass ratio of coal gasification lime-ash.Then under the conditions of 160 DEG C at dissolution
Manage 45min.Dissolution processing is filtered after terminating, and obtains filtrate and filter residue.
Filtrate after making each parameter consistent with the solution of containing alcohol alkali, is back to coal gasification by filling into ethanol in proper amount, sodium oxide molybdena
Lime-ash dissolution is handled.Filter residue is washed with the aqueous solution of alkali, and the aqueous solution of alkali is concentration 120g/L sodium hydrate aqueous solution, alkali
The volume of the aqueous solution and the mass ratio of filter residue are 2.5 liters/kilogram (liquid-solid ratio), and 30min is washed at 70 DEG C.Mistake after washing terminates
Filter, obtains thick rich aluminium liquid and slag.
Thick richness aluminium liquid adds solid silicea calcium oxide and carries out desiliconization removal of impurities, make solution silicon by adjusting alkali concn to after 90g/L
Volume index reaches 300, then obtains smart rich aluminium liquid and white residue.White residue and slag are together exclusive and are used as construction material.Essence
Rich aluminium liquid obtains aluminium hydroxide and crystalline mother solution, 40 DEG C of crystallization temperature, crystallization time 70 hours, essence richness aluminium during crystallization by crystallization
Alkali concn in liquid is 90g/L, crystal seed coefficient 1.7.Crystalline mother solution is by adjustment, after making each parameter consistent with the aqueous solution of alkali,
It is back to residue washing；Aluminium hydroxide is by 1000 DEG C, and the roasting of 25 minutes obtains aluminum oxide.
The rate of recovery of aluminum oxide is up to 63 mass % in the embodiment.
Embodiment 7
Spent glycol, potassium hydroxide allocate containing alcohol alkali solution, potassium hydroxide by potassium in the solution for making containing alcohol alkali concentration
Reach that 4mol/L amount is added.
It is 1 by broken, levigate to less than 80 μm mass ratioes:1 red mud and mixture of fly ash is added to deployed
In the solution of containing alcohol alkali, the volume of solution and the mass ratio of red mud and mixture of fly ash for making containing alcohol alkali are 10 liter/kilogram (liquid
Gu ratio).Then dissolution handles 120min under the conditions of 300 DEG C.Dissolution processing is filtered after terminating, and obtains filtrate and filter residue.
Filtrate after making each parameter consistent with the solution of containing alcohol alkali, is back to red by filling into proper amount of glycol, potassium hydroxide
Mud and mixture of fly ash dissolution processing.Filter residue is washed with the aqueous solution of alkali, and the aqueous solution of alkali is concentration 120g/L hydroxide
Aqueous solutions of potassium, the volume of the aqueous solution of alkali and the mass ratio of filter residue are 2.5 liters/kilogram (liquid-solid ratio), are washed at 70 DEG C
30min.Washing is filtered after terminating, and obtains thick rich aluminium liquid and slag.
Thick richness aluminium liquid adds solid silicea and carries out desiliconization removal of impurities, refer to the silicon amount of solution by adjusting alkali concn to after 90g/L
Number reaches 300, then obtains smart rich aluminium liquid and white residue.White residue and slag are together exclusive and are used as construction material.Smart richness aluminium
Liquid obtains aluminium hydroxide and crystalline mother solution, 40 DEG C of crystallization temperature, crystallization time 70 hours, during crystallization in essence richness aluminium liquid by crystallization
Alkali concn be 90g/L, crystal seed coefficient 1.7.Crystalline mother solution is by adjustment, after making each parameter consistent with the aqueous solution of alkali, returns
To residue washing；Aluminium hydroxide is by 1000 DEG C, and the roasting of 25 minutes obtains aluminum oxide.
The rate of recovery of aluminum oxide is up to 58 mass % in the embodiment.
Comparative example 1 provides the embodiment and its result that aluminum oxide is reclaimed using Bayer process.
With sodium hydroxide, aluminium hydroxide allotment sodium aluminate solution, the alkali concn in solution is set to reach 230g/L (by sodium oxide molybdena
Meter), the mol ratio of sodium hydroxide and aluminium hydroxide is 3 in solution.
Broken, the levigate red mud to less than 80 μm is added in deployed sodium aluminate solution, makes sodium aluminate solution
The mass ratio of volume and red mud is 6 liters/kilogram, and adds the solid silicea calcium oxide for accounting for 2 mass % red mud quality, then 240
Dissolution handles 120min under the conditions of DEG C.Dissolution processing is filtered after terminating, and obtains filtrate and filter residue.
Using pure water filter residue, and rear liquid will be washed mixed with filtrate, and the alkali concn of filtrate is dropped to 90g/L, and again
Add solid silicea calcium oxide and carry out desiliconization removal of impurities, the siliceous modulus of filtrate is reached 300.Then filtrate obtains hydrogen-oxygen by crystallization
Change aluminium and crystalline mother solution, 40 DEG C of crystallization temperature, crystallization time 70 hours, crystal seed coefficient 2.
Crystalline mother solution after making alkali concn consistent with the sodium aluminate solution for exsolution red mud, is back to red mud by evaporation
Dissolution；Aluminium hydroxide is by 1000 DEG C, and the roasting of 25 minutes obtains aluminum oxide.
The rate of recovery of aluminum oxide is 6 mass % in the comparative example.
Method of the invention is can be seen that from embodiments of the invention and comparative example compared with prior art, aluminum oxide
The rate of recovery it is high, and structure without roasting destruction waste residue containing aluminum i ndustry and/or the associated minerals containing aluminium and avoid dissolution
The wide fluctuations of alkali concn in journey and crystallization process, so as to reduce energy consumption.
Table 1 is the content (quality %) of the element in terms of oxide in the red mud that the embodiment of the present invention is used.
| Al2O3 | Fe2O3 | SiO2 | Na2O | CaO | TiO2 |
| 21.49 | 22.13 | 18.46 | 10.46 | 6.89 | 3.14 |
Table 2 is the content (quality %) of the element in terms of oxide in the flyash that the embodiment of the present invention is used.
| Al2O3 | SiO2 | CaO | Fe2O3 | TiO2 |
| 30.79 | 37.80 | 9.41 | 2.91 | 1.12 |
Table 3 is the content (quality %) of the element in terms of oxide in the FCC poising agents that the embodiment of the present invention is used.
| Al2O3 | SiO2 | La2O3 | CeO2 | Fe2O3 | NiO |
| 49.80 | 40.05 | 1.34 | 2.81 | 1.44 | 1.16 |
Table 4 is the content (quality %) of the element in terms of oxide in the coal gasification lime-ash that the embodiment of the present invention is used.
| Al2O3 | SiO2 | Fe2O3 | CaO | MgO | TiO2 | K2O |
| 27.90 | 41.00 | 5.71 | 5.81 | 2.05 | 2.07 | 1.01 |
Claims (16)
1. a kind of recovery method of aluminum oxide, this method includes：
A, waste residue containing aluminum i ndustry and/or associated minerals containing aluminium are subjected to dissolution processing with the solution of containing alcohol alkali and filtered, obtain filtrate
With the filter residue containing aluminium；The solution of the containing alcohol alkali for alkali metal containing alkoxide alcoholic solution or alkali metal containing alkoxide alcohol and water it is molten
Liquid；
B, the filter residue of gained in step a washed and filtered with the aqueous solution of alkali, obtain thick richness aluminium liquid and slag；
C, the thick rich aluminium liquid progress desiliconization removal of impurities processing by gained in step b, obtain smart rich aluminium liquid and white residue；
D, the essence richness aluminium liquid progress crystallization treatment by gained in step c, obtain crystalline mother solution and aluminium hydroxide；
E, the aluminium hydroxide progress calcination process by gained in step d, obtain aluminum oxide.
2. method according to claim 1, wherein, the oxidation of waste residue containing aluminum i ndustry described in step a and/or the associated minerals containing aluminium
The mass ratio of aluminium/silica is 0.6~1.5.
3. method according to claim 1, wherein, waste residue containing aluminum i ndustry described in step a is selected from flyash, red mud, coal gas
At least one of ashing slag, aluminium ash, FCC poising agents and gangue, the associated minerals containing aluminium are selected from kaolin, clay and silk
At least one of sodium aluminium stone.
4. method according to claim 1, wherein, the alcohol described in step a described in the solution of containing alcohol alkali is selected from the one of C1-C4
At least one of polyalcohol of first alcohol and C2-C4；The alkali metal alcoholates be selected from C1-C4 monohydric alcohols alkali metal alcoholates and
At least one hydroxyl hydrogen atom of C2-C4 polyalcohols replaced by alkali metal atom obtained by least one of alkoxide.
5. method according to claim 1, wherein, the alcohol described in step a described in the solution of containing alcohol alkali is methanol and/or second
Alcohol, the alcohol alkali is selected from least one of sodium methoxide, potassium methoxide, caustic alcohol and potassium ethoxide.
6. method according to claim 1, wherein, the solution of the containing alcohol alkali described in step a is by alkali metal oxide or alkali gold
Belong to hydroxide to be made with alcohol reaction, or made by the mixed liquor reaction of alkali metal oxide or alkali metal hydroxide and alcohol and water
.
7. method according to claim 1, wherein, the condition of the processing of dissolution described in step a includes：Dissolution processing temperature be
160-300 DEG C, the time of dissolution processing is 15-300 minutes, volume and the waste residue containing aluminum i ndustry of the solution of the containing alcohol alkali
And/or the ratio between the gross mass of the associated minerals containing aluminium for 4-10 liters/kilogram, the total concentration of alkali metal is 1- in the solution of the containing alcohol alkali
The ratio between 12 mol/Ls and the volume of water and alcohol are less than 3:7.
8. method according to claim 7, wherein, the condition of the processing of dissolution described in step a includes：Dissolution processing temperature be
210-260 DEG C, the time of dissolution processing is 90-150 minutes, volume and the waste residue containing aluminum i ndustry of the solution of the containing alcohol alkali
And/or the ratio between the gross mass of the associated minerals containing aluminium for 5-8 liters/kilogram, the total concentration of alkali metal is 2-6 in the solution of the containing alcohol alkali
The ratio between mol/L and the volume of water and alcohol are less than 1：4.
9. method according to claim 1, wherein, this method also includes：It regard the filtrate of gained in step a as the containing alcohol alkali
At least a portion of solution be back to use in dissolution processing.
10. method according to claim 9, wherein, this method also includes：Institute is carried out again after solid silicea is added in the filtrate
Reuse is stated, or is directly added in the solution of the containing alcohol alkali after solid silicea, then carries out the dissolution processing.
11. method according to claim 1, wherein, the aqueous solution of alkali described in step b is sodium hydroxide and/or potassium hydroxide
The aqueous solution.
12. method according to claim 1, wherein, the condition washed described in step b includes：Wash temperature is 40-80 DEG C,
Wash time is 10-40 minutes；In terms of the quality of oxide, the concentration of alkali is 90-130 g/l in the aqueous solution of the alkali；Institute
State the aqueous solution of alkali volume and the filter residue mass ratio for 1.5-3 liters/kilogram.
13. method according to claim 1, wherein, this method also includes：Using solid silicea to the thick rich aluminium in step c
Liquid carries out the desiliconization removal of impurities processing, and the solid silicea is the oxide and/or hydroxide of calcic.
14. method according to claim 10, wherein, the solid silicea is the oxide and/or hydroxide of calcic；Step a
Described in the addition of solid silicea be the waste residue containing aluminum i ndustry and/or the 1-5 mass % of the quality of associated minerals containing aluminium.
15. method according to claim 1, wherein, the condition of crystallization treatment is described in step d：The temperature of crystallization treatment is
30-50 DEG C, the time of crystallization treatment is 60-120 hours, and the concentration of alkali is 70-100 g/l in essence richness aluminium liquid during crystallization treatment,
Crystal seed coefficient is 1.5-2.
16. method according to claim 1, wherein, using the crystalline mother solution of gained in step d as alkali described in step b water
At least a portion of solution is back to use in the washing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510112638.9A CN106032285B (en) | 2015-03-13 | 2015-03-13 | A kind of recovery method of aluminum oxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510112638.9A CN106032285B (en) | 2015-03-13 | 2015-03-13 | A kind of recovery method of aluminum oxide |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106032285A CN106032285A (en) | 2016-10-19 |
| CN106032285B true CN106032285B (en) | 2017-10-03 |
Family
ID=57150716
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510112638.9A Active CN106032285B (en) | 2015-03-13 | 2015-03-13 | A kind of recovery method of aluminum oxide |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106032285B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108722422B (en) * | 2017-04-21 | 2020-10-30 | 中国石油化工股份有限公司 | Red mud activation modification method and application |
| CN107215884A (en) * | 2017-06-07 | 2017-09-29 | 佛山市吉力达铝材科技有限公司 | A kind of processing method of alumina waste water slag |
| CN111203425B (en) * | 2020-01-10 | 2021-10-29 | 泉州丰鹏环保科技有限公司 | Process and device for crushing and recovering alumina framework of waste FCC catalyst |
| CN114717417A (en) * | 2020-12-21 | 2022-07-08 | 青岛惠城环保科技股份有限公司 | Treatment method of heavy metal-containing silicon-aluminum-based waste residue, amorphous silicon-aluminum powder and application thereof |
| CN112645372B (en) * | 2021-01-19 | 2023-05-05 | 广西化工研究院有限公司 | Method for recycling waste activated alumina regenerant for hydrogen peroxide |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4280987A (en) * | 1978-07-11 | 1981-07-28 | Showa Aluminum Industries K.K. | Method for treatment of Bayer liquor |
| CN1217294A (en) * | 1997-11-07 | 1999-05-26 | 中南工业大学 | Wet chemical pretreatment process |
| CN1287972A (en) * | 2000-11-01 | 2001-03-21 | 中国长城铝业中州铝厂 | Method for improving clinker alumina stripping ratio for agglutination method alumina prodn. |
| CN101767807A (en) * | 2010-01-20 | 2010-07-07 | 潘爱芳 | Method for extracting high-purity aluminum oxide and silica gel from beauxite |
| CN102795647A (en) * | 2011-05-26 | 2012-11-28 | 中国石油化工股份有限公司 | Macro-porous aluminum oxide and preparation method thereof |
| CN103288112A (en) * | 2013-05-29 | 2013-09-11 | 如皋市乐恒化工有限公司 | Method for preparing high-purity aluminum oxide by alkaline process |
-
2015
- 2015-03-13 CN CN201510112638.9A patent/CN106032285B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4280987A (en) * | 1978-07-11 | 1981-07-28 | Showa Aluminum Industries K.K. | Method for treatment of Bayer liquor |
| CN1217294A (en) * | 1997-11-07 | 1999-05-26 | 中南工业大学 | Wet chemical pretreatment process |
| CN1287972A (en) * | 2000-11-01 | 2001-03-21 | 中国长城铝业中州铝厂 | Method for improving clinker alumina stripping ratio for agglutination method alumina prodn. |
| CN101767807A (en) * | 2010-01-20 | 2010-07-07 | 潘爱芳 | Method for extracting high-purity aluminum oxide and silica gel from beauxite |
| CN102795647A (en) * | 2011-05-26 | 2012-11-28 | 中国石油化工股份有限公司 | Macro-porous aluminum oxide and preparation method thereof |
| CN103288112A (en) * | 2013-05-29 | 2013-09-11 | 如皋市乐恒化工有限公司 | Method for preparing high-purity aluminum oxide by alkaline process |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106032285A (en) | 2016-10-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106032285B (en) | A kind of recovery method of aluminum oxide | |
| US7871583B2 (en) | Process for recovery of silica followed by alumina from coal fly ash | |
| CA2631190C (en) | Recovery of rare earth elements | |
| CN106319218A (en) | Method for recovering rare earth, aluminum and silicon from rare earth-containing aluminum and silicon wastes | |
| CN106830030A (en) | A kind of method of the safe and efficient production sandy alumina of utilization aluminium ash | |
| CN102586610B (en) | Cleaner production process for synchronously extracting vanadium and aluminum from aluminothermic vanadium iron slag | |
| CN102643985B (en) | Method for extracting valuable metals from high-iron bauxite with step-by-step acid leaching | |
| CN102312098A (en) | Method for separation and purification of fluorescent grade yttrium oxide and europium oxide from waste phosphor powder | |
| Pan et al. | Pre-desilication and digestion of gibbsitic bauxite with lime in sodium aluminate liquor | |
| CN110395757B (en) | Method for removing alkali metal and alkaline earth metal impurities in acid-process alumina | |
| CN102674477A (en) | Method for co-production of superfine ferroferric oxide and aluminum oxide by red mud of Bayer process | |
| CN102502733A (en) | Method for treating gibbsite by using high-concentration alkali liquor under normal pressure | |
| CN103121700A (en) | Method for preparing ultrafine alumina and coproducing and white carbon black by utilizing coal series kaolin | |
| CN111647751B (en) | Method for enriching platinum group metals from automobile waste catalyst | |
| Yaowu et al. | Study on extracting aluminum hydroxide from reduction slag of magnesium smelting by vacuum aluminothermic reduction | |
| CN101987735B (en) | Method for extracting alumina from coal gasification fly ash at low temperature | |
| CN109721081A (en) | A method of extracting lithium from rich lithium flyash alkaline process mother liquor | |
| CN104445310A (en) | Novel process for treating middle-low bauxite in complete wet method alkali system | |
| CN112777620A (en) | Method for recycling aluminum ash or aluminum slag by using alkaline leaching method | |
| CN100593018C (en) | Technological process method of producing aluminium oxide using high aluminium slag | |
| CN106032286B (en) | A kind of production method of aluminum oxide | |
| RU2562183C1 (en) | Method of producing of scandium concentrate from red slime | |
| CN115072749A (en) | Method for extracting lithium from spodumene without slag | |
| Tian et al. | An Improved Lime Sinter Process to Produce Al2O3 from Low‐Grade Al‐Containing Resources | |
| CN103964478B (en) | The method of a kind of calcification-carborization process middle-low grade aluminum-containing raw material and aluminium circulation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |