CN106315642B - A kind of preparation method of boehmite and the preparation method of gamma-alumina - Google Patents
A kind of preparation method of boehmite and the preparation method of gamma-alumina Download PDFInfo
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Abstract
The invention discloses a kind of preparation method of boehmite and the preparation method of gamma-alumina, the preparation method of the boehmite includes contacting the solution of sodium metaaluminate or sodium aluminate with carbonated gas, plastic in continuous or intermittent manner, and concentrated the mixture obtained after plastic, gained concentrate is then added into water or carries out aging after being not added with water.Method according to the invention it is possible to gamma-alumina of the pore volume more than 0.6 ml/g is readily available, and the method for the present invention can reduce the load capacity of aging by being concentrated before ageing, so as to reduce the energy consumption of aging and reduce the volume of aging equipment.
Description
Technical field
The present invention relates to a kind of preparation method of boehmite and the gama-alumina including the preparation method preparation
Method.
Background technology
Sodium metaaluminate (or sodium aluminate)-carbon dioxide process be prepare boehmite and gama-alumina common method it
One.Because this method can combine aluminium manufacturer's industry actual conditions, can with bauxite produce sodium metaaluminate (or sodium aluminate) solution and
CO 2 waste gas prepares boehmite and gama-alumina as raw material, is a kind of cheap method, therefore this method is industrial
It is widely used.
Sodium metaaluminate (or sodium aluminate)-carbon dioxide process prepares boehmite and generally comprises two mistakes of plastic and aging
Journey.In the prior art, the plastic of sodium metaaluminate (or sodium aluminate) solution and carbon dioxide (or neutralization) reaction can interval or company
Continuous progress.It is that carbon dioxide is passed into substantial amounts of sodium metaaluminate (or sodium aluminate) solution in the reaction of interval plastic
In, the endpoint pH of plastic reaction is controlled 9.5, best more than 10.In continuous gel formation reaction, sodium metaaluminate (or sodium aluminate)
Solution and carbon dioxide are each contacted with certain speed, and the pH value (process pH value) of plastic reaction is also controlled 9.5, most
More than 10.Plastic reaction is carried out under the conditions of this high ph-values, can obtain the higher boehmite of crystallinity, but due to
Its grain shape is solid spherical, and intercrystalline accumulation is close, therefore the pore volume of the gama-alumina obtained after being calcined is smaller, typically
Less than 0.5 ml/g.This significantly limit its answering in distillate hydrogenation, particularly heavy oil, residual oil hydrocatalyst
With.To obtain the gama-alumina of higher pore volume, prior art needs using special preparation technology or adds additive.This
On the one hand cost is added, on the other hand causes production technology to become complicated.And ageing process is usually then that will be obtained after plastic
Mixture be directly warming up to aging temperature carry out aging.
For example, CN103449484A discloses a kind of method of continuous production boehmite.Methods described includes will be dense
Spend for 15-80 grams of aluminum oxide/liter sodium aluminate solution be continuously added in reaction unit, while be passed through carbonated 30
More than volume % air carbon dioxide gas mixture is sufficiently mixed, and controls the stream of mixed gas and sodium aluminate solution
Amount makes reaction temperature be 25-55 DEG C, pH value 9.5-11, and slurries after the pipeline with multiple U-tubes by carrying out aging, aging
Temperature is not less than 90 DEG C, and the slurry filtration after aging is heated up simultaneously is washed to neutrality, by the filter cake after washing at 100-120 DEG C
Under conditions of dry, obtain boehmite.The pore volume scope of gained aluminum oxide is in 0.30- in the embodiment that this method provides
Between 0.33 ml/g.
CN1583568A discloses a kind of method that improved sodium metaaluminate-carbon dioxide prepares boehmite, and it is made
Standby process include to be passed through in the water of concentration 35-60 volume % carbon dioxide add 70-200 grams of aluminum oxide of concentration/liter, causticity system
Number 1.1-1.8 sodium aluminate solution, the addition time of sodium aluminate solution is 0.5-10 minutes.By controlling carbon dioxide
It is 10-13 that throughput, which controls the pH value of solution, the throughput for the carbon dioxide that increased sharply after addition, makes solution ph rapid
9.5-10.5 is reduced to, obtains reacting slurry, carbonation temperature is controlled at 10-35 DEG C.Reacting slurry is separated, by the knot of separation
Crystalline substance washing, dry post processing obtain product.In the embodiment that this method provides, the pore volume scope of aluminum oxide for 0.9-1.2 milliliters/
Gram.
CN103601226A discloses a kind of preparation method of boehmite.It in concentration is 200-450 that methods described, which is,
Gram aluminum oxide/liter sodium aluminate solution in add soluble cellulose derivative include carboxymethyl cellulose, methylcellulose,
Ethyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl cellulose and their sodium salt, or soluble starch derivative include
CMS, hydroxypropul starch and its sodium salt etherification starch or dextrin, addition are the 2-5% of quality of alumina.With concentration
For 30-80 volumes % carbon dioxide, to be neutralized to solution ph be 10-11.And sodium aluminate solution is diluted to 10-80 grams of oxygen
Change aluminium/liter, add the urea equivalent to quality of alumina 1-3%, stir, continue to be passed through carbon dioxide being neutralized to
Solution ph is 9-10, and in 20-60 DEG C of aging 0.5-6 hour, separation of solid and liquid, solid wash, are dried to obtain and intend thin water aluminium solution
Stone.In the embodiment that this method provides, the pore volume scope of aluminum oxide is 1.7-2.3 mls/g.
When producing boehmite and gama-alumina with sodium metaaluminate (or sodium aluminate)-carbon dioxide process, for obtain compared with
High pore volume, prior art using special preparation technology or add additive.In order to reduce cost, life should be simplified as far as possible
Production. art and avoid add additive.Therefore, CN1091428C discloses a kind of preparation method of boehmite, this method makes
With concentration be 5-120 grams of aluminum oxide/liter sodium aluminate solution and carbon dioxide content more than 20 volume % gas contact, with
Mode plastic intermittently or serially, 10-100 DEG C of gelling temperature, plastic terminal (or process) pH value in 6-9.5, plastic reaction
Time or residence time are no more than 40 minutes.Added after cemented into bundles inorganic base, organic base and one kind in their aqueous solution or
It is several, slurry pH value is risen to 9.5-11.5 or rapid and carry out separation of solid and liquid and wash.It can be prepared in fiber using this method
Shape, and with high-crystallinity boehmite, it is fired after formed gama-alumina pore volume 0.5-2.0 mls/g it
Between.But relatively low plastic terminal (or process) pH value is easily caused the generation of dawsonite, because dawsonite is not soluble in water, is washing
It can not be removed during washing, the content of sodium oxide molybdena is too high in the product because obtained from, this serious property that have impact on product.
In order to avoid the generation of dawsonite under relatively low plastic terminal (or process) pH value, this method needs to add in ageing process
Alkaline matter or carry out separation of solid and liquid immediately after plastic and washed to carry out aging again, this not only adds be produced into
This, while limit the flexibility of production technology.
The content of the invention
It is an object of the invention to provide a kind of new method for preparing boehmite and gama-alumina, this method energy
Enough it is readily available gama-alumina of the pore volume more than 0.6 ml/g.
It was found by the inventors of the present invention that by increasing concentration step on the basis of existing technology, plastic is obtained mixed
Aging is carried out to gained concentrate after compound concentration, pore volume can be obtained 0.6 therefore without any additive is additionally added
Gama-alumina more than ml/g.And inventor by further study show that, by adding deionization into concentrate
Water, it can controllably obtain different pore volumes of the pore volume in the range of 0.6-1.5 mls/g by adjusting the amount of the water added
Gama-alumina.
According to an aspect of the present invention, the invention provides a kind of preparation method of boehmite, this method includes will
Sodium metaaluminate or the contact of the solution of sodium aluminate and carbonated gas, plastic in continuous or intermittent manner, and by plastic
The mixture obtained afterwards is concentrated, and gained concentrate then is added into water or carries out aging after being not added with water.
According to another aspect of the present invention, the invention provides a kind of preparation method of gama-alumina, this method to include system
The boehmite of standby boehmite, then roasting gained, wherein, the method for preparing boehmite is that above-mentioned plan is thin
The preparation method of diaspore.
Method according to the invention it is possible to it is readily available gama-alumina of the pore volume more than 0.6 ml/g, Er Qieben
The method of invention can reduce the load capacity of aging by being concentrated before ageing, so as to reduce the energy consumption of aging and reduction
The volume of aging equipment.In addition, by adding deionized water into concentrate, can be by adjusting the amount of the water added come controllable
Ground obtains the gama-alumina of different pore volumes of the pore volume in the range of 0.6-1.5 mls/g.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Embodiment
The embodiment of the present invention is described in detail below.It is it should be appreciated that described herein specific
Embodiment is merely to illustrate and explain the present invention, and is not intended to limit the invention.
According to an aspect of the present invention, the invention provides a kind of preparation method of boehmite, this method includes will
The solution of sodium metaaluminate or sodium aluminate contacts with carbonated gas, in continuous or intermittent manner plastic, and by plastic
The mixture obtained afterwards is concentrated, and gained concentrate then is added into water or carries out aging after being not added with water.
According to the present invention, by before aging being concentrated the mixture obtained after plastic, can be readily available
Pore volume is more than 0.6 ml/g of aluminum oxide.Preferably, the multiple of concentration is 2-10 times, more preferably 3-8 times.The present invention
In, the multiple of concentration is calculated according to the mass concentration before mass concentration/concentration after concentration, such as the concentration before concentration is
10 g/l, the concentration after concentration is 30 g/l, then cycles of concentration is 3 times.Concentration therein is the quality in terms of aluminum oxide
Concentration.Usually, before concentration, the concentration of the mixture obtained after plastic is calculated as 5-40 g/l with aluminum oxide.And concentrate is dense
Degree is then generally 15-180 g/l in terms of aluminum oxide, and the concentration of further preferred concentrate is 20-150 g/l.
In the method for the present invention, the mode of concentration can be various partly or entirely removing wherein solution or clear liquid component
The mode of (solid constituent obtained relative to plastic), such as the mode of part or all of supernatant is settled and then removes, specifically
The mode of sedimentation for example can be the one or more in standing sedimentation and centrifugation.
In the present invention, content or concentration in terms of aluminum oxide refer to that the content of wherein aluminium-containing substance is converted to containing for aluminum oxide
Amount, and it is not offered as the only wherein content or concentration of aluminum oxide in itself.
According to the preparation method of the boehmite of the present invention and gama-alumina, inventors of the present invention have surprisingly found that,
The pore volume of gama-alumina obtained by after can accordingly regulating and controlling roasting as the amount of control plus water.For example, the amount for adding water by controlling is
At 0.5 times of the volume of concentrate, the pore volume of gained gama-alumina is 1.0 mls/g；The amount for adding water by controlling is concentrate
At 3 times of volume, the pore volume of gained gama-alumina is 1.5 mls/g.But further the amount of increase water is not bright to pore volume
Aobvious influence.Therefore, in order to obtain the gama-alumina of larger pore volume, it is preferable that the concentrate carries out aging after adding water, and
The amount of the water of addition and the volume ratio of concentrate are 1：0.2-3.5, preferably 1：0.5-3.
In order to prevent other impurities from intending thin to the gama-alumina obtained below and the influence of subsequent catalyst, the present invention
Water used is deionized water in diaspore and gama-alumina preparation process.
According to method provided by the invention, using continuation mode plastic, a certain amount of go is previously added in plastic cans first
Ionized water, while carbon dioxide containing gas is passed through from the bottom of tank, and to be passed through at the top of tank sodium metaaluminate (or sodium aluminate) molten
Liquid.Gelling temperature is controlled, and controls the concentration and the concentration and flow of flow and carbon dioxide containing gas of sodium aluminate solution, with
Plastic process pH value and plastic reaction time are controlled, the slurries of plastic process generation continuously flow out from plastic cans, controlled
Liquid level is constant in plastic cans processed, is delivered to after slurries concentration and aging is carried out in ageing can.
Routinely condition is carried out for the aging, and the mode for typically using temperature to be 3 hours for 90 DEG C of times at present is old
Change, if because temperature is too low, under low temperature aging easily generate dawsonite.But it was found by the inventors of the present invention that using the present invention first
The mode of aging again is concentrated, prolonged aging is carried out in the case of aging temperature as little as 40 DEG C, also without silk sodium aluminium
Stone generates, while remains to, with more than 0.6 ml/g of pore volume, thus drop significantly after the boehmite sintering being achieved in that
The energy consumption of low aging.Therefore, according to the present invention, the aging temperature can be 40-100 DEG C, preferably 50-100 DEG C, ageing time
More than 0.5 hour, preferably 30-1000 minutes, more preferably 1-10 hours.
Preferably, the concentration of the solution of the sodium metaaluminate or sodium aluminate is calculated as 5-40 g/l with aluminum oxide before plastic, more
Preferably 5-35 g/l.
The pH value of plastic is referred to prior art progress.Using the method for prior art, when plastic terminal (or process)
When pH value is less than 10, especially less than 9.5, the aluminium hydroxide and reaction of sodium bicarbonate generation dawsonite of the generation of plastic process
(NaAl(OH)2CO3).Therefore, the pH of prior art general control plastic process is higher than 10.
But it was found by the inventors of the present invention that by concentrated slurry, and relatively low sodium aluminate solution concentration is controlled, even if into
Glue terminal (or process) pH value is relatively low, and the bicarbonate concentration in slurries is also not enough to cause dawsonite to generate.Therefore use
The method of concentrated slurry, by controlling suitable sodium aluminate solution concentration, relatively low plastic terminal (or process) pH value can be avoided
The generation of lower dawsonite, while obtain higher aluminum oxide pore volume.
It is therefore preferred that in terms of aluminum oxide, the concentration of the solution of the sodium metaaluminate and/or sodium aluminate be no more than 40 grams/
Rise, more preferably 5-35 g/l, be even more preferably 5-30 g/l.The plastic process pH value control is in the preferred of 7-10
In the range of 7.5-9.5.
Usually, the content of the carbonated carbon dioxide in gas is more than 5 volume %, preferably greater than 20 bodies
Product %, more preferably higher than 30 volume %.The concentration of carbon dioxide is too low, can unnecessarily extend the production time, reduces efficiency.
Preferably, the control of plastic reaction time is controlled in 30-95 in 2-60 minutes preferred 7-50 minutes, gelling temperature
Preferably 35-90 DEG C in the range of DEG C.
Preferably, the preparation method of boehmite provided by the invention also includes carrying out in the mixture obtained after aging
Separation of solid and liquid, and gained solid product is washed and dried.The mode of separation of solid and liquid for example can be sedimentation, filtering and centrifugation point
One or more modes from.Washing can be carried out using deionized water.The washing is carried out according to a conventional method, the mesh of washing
Be to remove wherein foreign ion, wherein sodium oxide content is less than 0.1 weight %.
The drying is carried out according to a conventional method, and dry purpose is to remove trip contained in boehmite as far as possible
From water, therefore the temperature dried can be that room temperature turns below brilliant temperature to boehmite, preferably 100-200 DEG C.
According to another aspect of the present invention, the invention provides a kind of preparation method of gama-alumina, this method to include system
The boehmite of standby boehmite, then roasting gained, wherein, the method for preparing boehmite is that above-mentioned plan is thin
The preparation method of diaspore.
The temperature of the roasting can be 500-1200 DEG C, and the time of roasting can be 2-8 hours；Preferably, the roasting
The temperature of burning is 550-850 DEG C, and the time of roasting is 3-6 hours.
According to the preparation method of gama-alumina provided by the invention, before the roasting, boehmite can be first molded
Or it is not molded.The shaping is carried out according to a conventional method, such as can be mixed boehmite with suitable quantity of water, extrusion molding, or
Boehmite is mixed with appropriate extrusion aid and/or adhesive and suitable quantity of water, then extrusion molding.The extrusion aid, peptization
Agent can be species and dosage commonly used in the art.
Gama-alumina prepared by method provided by the invention can be directly as various adsorbents and various catalyst as added
The carrier or matrix of the catalyst such as hydrogen is handled, is hydrocracked, catalytic cracking, reformation, isomerization, alkylation, disproportionation.
Gama-alumina prepared by method provided by the invention is be especially suitable for heavy oil (including residual oil) and various distillates
Hydrotreating or the carrier of hydrocracking catalyst.
The present invention will be further described for the following examples.In following examples, the crystallinity of boehmite, crystalline substance
Grain size and the content of dawsonite are determined using X-ray diffraction method (XRD), and the crystallization degree of pseudo-boehmite is relative crystallization
Degree, the aluminium hydroxide that the German Condea companies using the trade mark as SB produce is standard specimen, and SB crystallinity is 100%, in Germany
It is measured on Siemens companies D5005 type diffractometers.Sodium oxide content is managed in Japan with x ray fluorescence spectrometry (XRF)
Learn and determined on the type Xray fluorescence spectrometer of electric machine industry Co., Ltd. 3271.Than surface, pore volume U.S. Micromeritics
The ASAP2420 types n2 absorption apparatus measure of company's production.
Embodiment 1
Deionized water is filled it up with advance in one 3 liters of plastic cans, and it is big to be passed through carbon dioxide content from the bottom of plastic cans
In 99 volume % carbon dioxide and the mixed gas of air, be passed through above plastic cans concentration for 20 grams of aluminum oxide/liter
Sodium aluminate solution, make sodium aluminate solution and mixed gas counter current contacting, the flow of sodium metaaluminate liquid is 60 ml/mins
(reaction time 50 minutes), by adjusting mixed gas flow, it is 7.5 ± 0.2 to control plastic process pH value, plastic reaction
Temperature maintain 35 ± 2 DEG C, reacted slurries flow out from the overflow pipe of plastic cans, and liquid level maintains not in plastic cans
Become, after the deionized water being previously added is replaced by plastic reacting slurry, start to collect in slurries, standing sedimentation, and remove
Clear liquid, using obtain 150 grams of aluminum oxide/liter concentrate (i.e. cycles of concentration is 7.5), added in concentrate and the body such as concentrate
Long-pending deionized water, it is then fed into ageing can and carries out heating aging.By the slurries in ageing can under conditions of 90 ± 2 DEG C it is old
Change 1 hour, filtering, washed with 60 times of deionized water, dried 8 hours at 120 DEG C and obtain boehmite N1.The plan that will be obtained
Boehmite is calcined 5 hours gama-alumina A at 550 DEG C1, table 1 gives N1And A1Physico-chemical property.
Embodiment 2
Deionized water is filled it up with advance in one 3 liters of plastic cans, and it is big to be passed through carbon dioxide content from the bottom of plastic cans
In 99 volume % carbon dioxide and the mixed gas of air, be passed through above plastic cans concentration for 10 grams of aluminum oxide/liter
Sodium aluminate solution, make sodium aluminate solution and mixed gas counter current contacting, the flow of sodium metaaluminate liquid is 300 ml/mins
(reaction time 10 minutes), by adjusting mixed gas flow, it is 9.5 ± 0.2 to control plastic process pH value, plastic reaction
Temperature maintain 50 ± 2 DEG C, reacted slurries flow out from the overflow pipe of plastic cans, and liquid level maintains not in plastic cans
Become, after the deionized water being previously added is replaced by plastic reacting slurry, start to collect in slurries, standing sedimentation, and remove
Clear liquid, using obtain 30 grams of aluminum oxide/liter concentrate (i.e. cycles of concentration is 3), 0.5 times of body of concentrate is incorporated as in concentrate
Long-pending deionized water, it is then fed into ageing can and carries out heating aging.By the slurries in ageing can under conditions of 70 ± 2 DEG C it is old
Change 2 hours, filtering, washed with 60 times of deionized water, dried 8 hours at 120 DEG C and obtain boehmite N2.The plan that will be obtained
Boehmite is calcined 3 hours gama-alumina A at 850 DEG C2, table 1 gives N2And A2Physico-chemical property.
Embodiment 3
Deionized water is filled it up with advance in one 3 liters of plastic cans, and it is big to be passed through carbon dioxide content from the bottom of plastic cans
In 99 volume % carbon dioxide and the mixed gas of air, be passed through above plastic cans concentration for 40 grams of aluminum oxide/liter
Sodium aluminate solution, make sodium aluminate solution and mixed gas counter current contacting, the flow of sodium metaaluminate liquid is 100 ml/mins
(reaction time 30 minutes), by adjusting mixed gas flow, it is 8.0 ± 0.2 to control plastic process pH value, plastic reaction
Temperature maintain 90 ± 2 DEG C, reacted slurries flow out from the overflow pipe of plastic cans, and liquid level maintains not in plastic cans
Become, after the deionized water being previously added is replaced by plastic reacting slurry, start to collect in slurries, standing sedimentation, and remove
Clear liquid, using obtain 180 grams of aluminum oxide/liter concentrate (i.e. cycles of concentration is 4.5), 3 times of concentrate is incorporated as in concentrate
The deionized water of volume, it is then fed into ageing can and carries out heating aging.By the slurries in ageing can under conditions of 50 ± 2 DEG C
Aging 5 hours, filtering, is washed with 60 times of deionized water, is dried 8 hours at 120 DEG C and is obtained boehmite N2.By what is obtained
Boehmite is calcined 4.5 hours at 700 DEG C, obtains boehmite N3With aluminum oxide A3.Table 1 gives N3And A3Thing
Change property.
Embodiment 4
Boehmite and gama-alumina are prepared as described in Example 3, unlike, water is not added into concentrate,
And concentrate is directly carried out to aging under the same conditions as example 1 after concentration, obtain boehmite N4And oxidation
Aluminium A4.Table 1 gives N4And A4Physico-chemical property.
Embodiment 5
Boehmite and gama-alumina are prepared as described in Example 3, unlike, cycles of concentration 2, intended
Boehmite N5With aluminum oxide A5.Table 1 gives N5And A5Physico-chemical property.
Embodiment 6
Prepare boehmite and gama-alumina as described in Example 3, unlike, the solution of sodium metaaluminate it is dense
Spend for 45 g/l, obtain boehmite N6With aluminum oxide A6.Table 1 gives N6And A6Physico-chemical property.
Embodiment 7
Boehmite and gama-alumina are prepared as described in Example 3, unlike, plastic pH is 10.5, is intended
Boehmite N7With aluminum oxide A7.Table 1 gives N6And A6Physico-chemical property.
Embodiment 8
Boehmite and gama-alumina are prepared as described in Example 3, unlike, gelling temperature is 30 DEG C, is obtained
Boehmite N8With aluminum oxide A8.Table 1 gives N8And A8Physico-chemical property.
Comparative example 1
Prepare boehmite and gama-alumina as described in Example 3, unlike, slurries without standing sedimentation and
Remove supernatant (i.e. not concentrated) the step of and be sent directly into ageing can and carry out heating aging, obtain reference boehmite
CN1With aluminum oxide CA1.Table 1 provides CN1And CA1Physico-chemical property.
Comparative example 2
Boehmite and gama-alumina are prepared by the method for comparative example 1, unlike, aging temperature is 50 ± 2 DEG C,
Ageing time is 5 hours, obtains reference boehmite CN2With aluminum oxide CA2.Table 1 gives CN2And CA2Physico-chemical property.
Comparative example 3
Prepare boehmite and gama-alumina by the method for comparative example 1, unlike, the pH of plastic reaction for 8.0 ±
0.2, the temperature of plastic reaction is 50 ± 2 DEG C, 30 minutes residence times of plastic reaction, obtains reference boehmite CN3With
Aluminum oxide CA3.Table 1 gives CN3And CA3Physico-chemical property.
From the results shown in Table 1, use the present invention method can be readily available pore volume for 0.6 ml/g with
Upper and specific surface area 200-270 meters squared per grams gama-alumina, without extra any additive of addition.In addition, pass through
Deionized water is added after concentration, the size of pore volume can be adjusted by adjusting the addition of deionized water, so as to there is pin
The gama-alumina of pore volume needed for being prepared to property.
The preferred embodiment of the present invention described in detail above, still, the present invention are not limited in above-mentioned embodiment
Detail, in the range of the technology design of the present invention, a variety of simple variants can be carried out to technical scheme, this
A little simple variants belong to protection scope of the present invention.
It is further to note that each particular technique feature described in above-mentioned embodiment, in not lance
In the case of shield, it can be combined by any suitable means.In order to avoid unnecessary repetition, the present invention to it is various can
The combination of energy no longer separately illustrates.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should equally be considered as content disclosed in this invention.
Claims (14)
1. a kind of preparation method of boehmite, the preparation method includes the solution of sodium metaaluminate or sodium aluminate and contains dioxy
Change the gas contact of carbon, plastic, and the mixture obtained after plastic is concentrated in continuous or intermittent manner, then by institute
Obtain concentrate to add water or carry out aging after being not added with water, the temperature of the aging is 40-100 DEG C, and the time is 30-1000 minutes.
2. preparation method according to claim 1, wherein, the mode of concentration is that the mixture obtained after plastic is sunk
Drop, and remove which part or whole supernatants.
3. preparation method according to claim 1 or 2, wherein, the multiple of concentration is 2-10.
4. preparation method according to claim 1 or 2, wherein, the concentrate carries out aging after adding water, the water of addition
Amount and the volume ratio of concentrate are 1：0.2-3.5.
5. preparation method according to claim 1 or 2, wherein, the concentrate carries out aging after adding water, the water of addition
Amount and the volume ratio of concentrate are 1：0.5-3.
6. preparation method according to claim 1 or 2, wherein, the water is deionized water.
7. preparation method according to claim 1 or 2, wherein, in terms of aluminum oxide, the sodium metaaluminate or sodium aluminate it is molten
The concentration of liquid is 5-40 g/l.
8. preparation method according to claim 1 or 2, wherein, the carbonated carbon dioxide in gas contains
Amount is more than 20 volume %.
9. preparation method according to claim 1 or 2, wherein, the carbonated carbon dioxide in gas contains
Amount is more than 30 volume %.
10. preparation method according to claim 1 or 2, wherein, the pH value of plastic process was controlled in 7-10, residence time
Control in 2-60 minutes, temperature control is at 30-95 DEG C.
11. preparation method according to claim 1 or 2, wherein, this method also includes entering in the mixture obtained after aging
Row separation of solid and liquid, and gained solid product is washed and dried.
12. a kind of preparation method of gama-alumina, this method includes preparing boehmite, then the thin water of plan of roasting gained
Aluminium stone, it is characterised in that the method for preparing boehmite is the method described in any one in claim 1-11.
13. according to the method for claim 12, wherein, the temperature of the roasting is 500-1200 DEG C, the time of roasting is
2-8 hours.
14. according to the method for claim 13, wherein, the temperature of the roasting is 550-850 DEG C, and the time of roasting is 3-
6 hours.
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| CN111468047A (en) * | 2020-04-23 | 2020-07-31 | 河南兴浩新材料科技股份有限公司 | Continuous preparation method of aluminum sol |
| CN112978773B (en) * | 2021-03-05 | 2023-04-18 | 天津众智科技有限公司 | High-performance aluminum oxide material and preparation method thereof |
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| CN85100161A (en) * | 1985-04-01 | 1986-07-30 | 山东省铝厂 | Carbonating technology (CO 2Method) produces pseudo-boehmite |
| CN1076318C (en) * | 1997-09-19 | 2001-12-19 | 中国科学院山西煤炭化学研究所 | Method for preparing active aluminum oxide by sodium aluminate carbonating process |
| CN1164494C (en) * | 2002-05-31 | 2004-09-01 | 中国石油化工集团公司 | Prepn of gamma-alumina |
| CN1221315C (en) * | 2003-05-31 | 2005-10-05 | 中国石油化工股份有限公司 | Silicon-phosphorus contained aluminum hydrate and its preparation |
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| CN103145161B (en) * | 2013-01-08 | 2015-04-01 | 大唐国际发电股份有限公司高铝煤炭资源开发利用研发中心 | Method for preparing pseudo-boehmite co-preparation white carbon black by coal gangue |
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