CN105664846B - A kind of preparation method of gas dehydration molecular sieve desiccant - Google Patents
A kind of preparation method of gas dehydration molecular sieve desiccant Download PDFInfo
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- CN105664846B CN105664846B CN201610214117.9A CN201610214117A CN105664846B CN 105664846 B CN105664846 B CN 105664846B CN 201610214117 A CN201610214117 A CN 201610214117A CN 105664846 B CN105664846 B CN 105664846B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/16—Alumino-silicates
- B01J20/18—Synthetic zeolitic molecular sieves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/28—Selection of materials for use as drying agents
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/20—Silicates
- C01B33/26—Aluminium-containing silicates, i.e. silico-aluminates
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
- C10L3/101—Removal of contaminants
- C10L3/106—Removal of contaminants of water
Abstract
The invention discloses a kind of preparation methods of gas dehydration molecular sieve desiccant, belong to gas dehydration field.This method comprises: kaolin starting material is ground to 2 μm or less, after carrying out fluosolids roasting in fluidized bed, addition silicon source, sodium source are mixed to form slurry, successively slurry is aged, hydrothermal crystallizing, separation of solid and liquid, obtains isolated solid product, then solid product is successively washed, is dried, obtain molecular screen primary powder, forming processes are carried out then to acid-resisting binder is added in molecular screen primary powder, drying obtains gas dehydration molecular sieve desiccant after roasting again；In slurry, SiO2/Al2O3Molar ratio be 1.7~2.1:1, SiO2/Na2O molar ratio is 0.6~0.9:1, H2O/Na2O molar ratio is 30~50:1.Have many advantages, such as crystallinity height, static water absorption rate height, acid gas, stable product quality using the molecular sieve desiccant that method provided by the invention is prepared.
Description
Technical field
The present invention relates to gas dehydration field, in particular to a kind of preparation side of gas dehydration molecular sieve desiccant
Method.
Background technique
Natural gas from underground reservoir is generally all aqueous, easily condenses into liquid water, shape in collecting defeated and treatment process
The blocking such as cause pipeline, throttle valve and instrument at ice-like crystalline hydrate, reduces production capacity and pipeline capacity, makes when serious
At halt production；In addition, liquid water is also easy to dissolution CO2、H2The sour gas such as S form strong corrosive acid solution and equipment are caused to be corroded.Institute
With it is necessary to be carried out dehydrating to natural gas.Gas dehydration is used for frequently with molecular sieve desiccant at present.Wherein, natural gas
Dehydration is mostly the silicon aluminate crystal of alkali or alkaline earth metal, molecular formula M with molecular sieve desiccant2/nO·Al2O3·
xSiO2·yH2O has very high affinity to the unsaturated molecule such as polar molecule, such as water, is the excellent of gas and liquid
Adsorbent.
The prior art provides a kind of preparation method of gas dehydration molecular sieve desiccant, comprising the following steps:
1) by SiO2/Al2O3Molar ratio is that the kaolin starting material of 2.10~2.35:1 crosses 120~325 meshes；
2) 1~4h is roasted at 500~1000 DEG C using one-step calcinations or dry method alkali roasting method, then by the height after roasting
Ridge soil carries out gelatinization, crystallization；
3) deionized water filtering and washing, drying；
4) it adds bentonite or kaolin raw ore is granulated；
5) gained desiccant particle roasts at 500~800 DEG C.
Inventor discovery in the prior art the prior art has at least the following problems:
It is prepared since raw material activation is uneven, crystallization barrier is high, institutional framework is poor in the method that the prior art provides
The crystallinity of molecular sieve desiccant is lower, easily leads to unstable product quality, and static water absorption rate is low.
Summary of the invention
The technical problem to be solved by the embodiment of the invention is that providing a kind of knot for effectively improving molecular sieve desiccant
Brilliant degree, and then improve the preparation method of the gas dehydration molecular sieve desiccant of its static water absorption rate.Specific technical solution is such as
Under:
A kind of preparation method of gas dehydration molecular sieve desiccant, which comprises
After kaolin starting material is ground to 2 μm hereinafter, carrying out fluosolids roasting in fluidized bed, addition silicon source, sodium source are mixed
Conjunction forms slurry, is successively aged to the slurry, hydrothermal crystallizing, separation of solid and liquid, obtains isolated solid product, so
The solid product is successively washed afterwards, is dried, molecular screen primary powder is obtained, it is anti-then to being added in the molecular screen primary powder
Acid binder carries out forming processes, and drying obtains gas dehydration molecular sieve desiccant after roasting again；
In the slurry, SiO2/Al2O3Molar ratio be 1.7~2.1:1, SiO2/Na2O molar ratio is 0.6~0.9:1,
H2O/Na2O molar ratio is 30~50:1.
Specifically, preferably, the kaolin starting material in soft kaolin, hard kaoline, gangue extremely
Few one kind.
Specifically, preferably, the temperature of the fluosolids roasting is 500~1000 DEG C, the time is 1.5~3 hours.
Specifically, preferably, source of aluminium in aluminum sulfate, aluminium hydroxide, boehmite and sodium aluminate extremely
Few one kind.
Specifically, preferably, the sodium source is selected from least one of sodium hydroxide, sodium carbonate and sodium bicarbonate.
Specifically, preferably, the time of the ageing is at least 12 hours.
Specifically, preferably, the time of the ageing is at least 48 hours.
Specifically, preferably, the temperature of the hydrothermal crystallizing is 70~100 DEG C, the time is at least 3 hours.
Specifically, preferably, the acid-resisting binder is attapulgite and/or sodium metasilicate, the acid-resisting bonding
The addition quality of agent is the 10~35% of the molecular screen primary powder quality.
Specifically, preferably, the temperature of the drying is 120 DEG C, the temperature roasted again is 450~900 DEG C,
Time is 1.5~3 hours.
Technical solution provided in an embodiment of the present invention has the benefit that
The preparation method of molecular sieve desiccant provided in an embodiment of the present invention, by by kaolin starting material be ground to 2 μm with
Under, after fluosolids roasting, raw material activation can be made uniformly, to improve raw material activity and reduce mass transfer barrier, then by setting up separately
Meter addition silicon source, sodium source are mixed to form slurry, to guarantee SiO in slurry2/Al2O3Molar ratio be 1.7~2.1:1, SiO2/
Na2O molar ratio is 0.6~0.9:1, H2O/Na2O molar ratio is 30~50:1, so controllable sial dismounting, after improving
The institutional framework of the continuous desiccant generated.Then slurry is aged, hydrothermal crystallizing, separation of solid and liquid, and to separation after
Solid product wash and molecular screen primary powder is made in drying.Later in molecular screen primary powder be added acid-resisting binder carry out at
Type processing, obtains gas dehydration molecular sieve desiccant after roasting again after drying.Raw material is realized by the above method
Uniform activation, reduce crystallization barrier, improve institutional framework, preparation-obtained gas dehydration molecular sieve desiccant
Have many advantages, such as crystallinity height, static water absorption rate height, acid gas, stable product quality.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is the X-ray diffractogram for the molecular screen primary powder that the embodiment of the present invention 1 provides；
Fig. 2 is the stereoscan photograph for the molecular screen primary powder that the embodiment of the present invention 1 provides.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
The preparation method of molecular sieve desiccant provided in an embodiment of the present invention, by by kaolin starting material be ground to 2 μm with
Under, after carrying out fluosolids roasting in fluidized bed, addition silicon source, sodium source are mixed to form slurry, to guarantee SiO in slurry2/Al2O3
Molar ratio be 1.7~2.1:1, SiO2/Na2O molar ratio is 0.6~0.9:1, H2O/Na2O molar ratio is 30~50:1, then
Slurry is aged, hydrothermal crystallizing, separation of solid and liquid, and washing and dry obtained molecule are carried out to the solid product after separation
Sieve original powder.Acid-resisting binder is added in molecular screen primary powder later and carries out forming processes, is obtained after drying through roasting again
Gas dehydration molecular sieve desiccant.The gas dehydration molecular sieve desiccant being prepared by the above method has knot
The advantages that brilliant degree height, static water absorption rate height, acid gas, stable product quality.
In embodiments of the present invention, SiO2/Al2O3Molar ratio abbreviation silica alumina ratio, SiO2/Na2The molar ratio of O is referred to as
Silicon sodium molar ratio, H2O/Na2O molar ratio abbreviation water sodium molar ratio.
Specifically, the kaolin that kaolin starting material used in the embodiment of the present invention can be common for this field, such as it can
To be selected from, soft kaolin (i.e. earthy kaolin, hardness are generally 1~2), (i.e. kaolinite rock, hardness are general for hard kaoline
Be 3~4), at least one of gangue, above-mentioned kaolin starting material is low in cost and be convenient for forming processes.
Wherein, kaolin starting material can be ground by mortar and/or ball mill, be ground to 2 μm with
Under, such as 1.5 μm, 1 μm, 0.8 μm etc., the raw material granularity to form molecular sieve desiccant structure is provided, to guarantee to be subsequently generated
Molecular sieve desiccant purity with higher.
Wherein, the temperature for carrying out fluosolids roasting in a fluidized bed to the kaolin starting material after grinding is 500~1000 DEG C,
Time is 1.5~3 hours.Fluosolids roasting ensure that uniform temperature fields, and raw material activation is uniform, wherein the temperature of fluosolids roasting
Can be set to 500 DEG C, 650 DEG C, 800 DEG C, 950 DEG C, 1000 DEG C etc., the time of fluosolids roasting can be set to 1.5 hours,
2 hours, 2.5 hours, 3 hours etc., preferably 2 hours can so destroy the crystal structure and composition of kaolin starting material, make its turn
It is melted into the unformed SiO with reactivity2And Al2O3Mixture is finally reached raising and optimizes the crystallization of molecular sieve desiccant
The purpose of degree.
Wherein, silicon source is selected from least one of aluminum sulfate, aluminium hydroxide, boehmite and sodium aluminate, passes through selection
Above-mentioned silicon source, to adjust SiO in slurry2/Al2O3Molar ratio be 1.7~2.1:1, for example, 1.7:1,1.8:1,1.9:1,
2.0:1,2.1:1 etc. optimize the composition of molecular sieve desiccant, regulation sial dismounting, and then it is dry to reach raising molecular sieve
The crystallinity of drying prescription and the purpose of static water absorption rate.
Wherein, sodium source is selected from least one of sodium hydroxide, sodium carbonate and sodium bicarbonate, by selecting above-mentioned sodium source,
To adjust SiO in slurry2/Na2O molar ratio is 0.6~0.9:1, for example, 0.6:1,0.7:1,0.8:1,0.9:1 etc., is made simultaneously
H in slurry2O/Na2O molar ratio is 30~50:1, for example, 30:1,35:1,40:1,45:1,50:1 etc., to molecular sieve desiccant
Composition optimize, and then achieve the purpose that improve molecular sieve desiccant crystallinity and static water absorption rate.
Wherein, the embodiment of the present invention is by being aged slurry, and the time of ageing is made to be at least 12 hours, preferably
At least 48 hours, for example, 15 hours, 20 hours, 30 hours, 40 hours, 50 hours, 55 hours, 60 hours etc., so that fluidised form
Kaolin starting material and silicon source, sodium source after changing roasting are sufficiently mixed uniformly, uniformly carry out hydrothermal crystallizing reaction convenient for the later period.
After the completion of to be aged, the slurry after ageing is placed in crystallization device and carries out at hydrothermal crystallizing by the embodiment of the present invention
Reason, and guarantee that the temperature of hydrothermal crystallizing is 70~100 DEG C, for example, 70 DEG C, 80 DEG C, 90 DEG C, 100 DEG C etc., it is small that the time is at least 3
When, such as 1 hour, 1.5 hours, 2 hours, 2.5 hours, 3 hours etc..By being as above arranged, can make each intermolecular strong in slurry
Strong effect controls dissolving crystallized molecular screen primary powder with formation with desired crystal structure.
After hydrothermal crystallizing treatment process, the embodiment of the present invention is separated by solid-liquid separation reflection raw material using suction method,
Isolated solid product is obtained, then deionized water etc. can be used to wash the solid product after separation, with removal
Remaining impurity on solid product, and then ensure that molecular sieve desiccant purity with higher.
Further, the embodiment of the present invention forms molecular screen primary powder by using acid-resisting binder, it is preferable that this is viscous
Tying agent is attapulgite and/or sodium metasilicate, wherein the addition quality of binder is the 10~35% of molecular screen primary powder quality, example
For example 10%, 15%, 20%, 25%, 30% etc..The addition of above-mentioned binder can make molecular screen primary powder have certain glue
Degree, convenient for molding, meanwhile, which can reside in molecular sieve desiccant, molecular sieve desiccant acid resistance is assigned, thus
Improve service life of the molecular sieve desiccant in natural gas.
After above-mentioned forming processes, product after molding is dried, such as drying temperature can be 100~150 DEG C,
Preferably 120 DEG C, to remove moisture therein.It is subsequently placed in Muffle furnace and is roasted again, and control and roast again
Temperature is 450~900 DEG C, for example, 450 DEG C, 550 DEG C, 650 DEG C, 750 DEG C, 850 DEG C etc., while the time that control roasts again
It is 1~3 hour, preferably 2 hours, so set, can be further by the incomplete substance of non-crystallized in molecular screen primary powder or crystallization
Crystallization is carried out, to improve the crystallinity and static water absorption rate of molecular sieve desiccant.
Hereinafter the present invention will be further described through by specific embodiment.
In following specific embodiments, condition person is not specified in related operation, according to normal conditions or manufacturer
It is recommended that condition carry out.It is raw materials used production firm is not specified and specification person be can be with conventional products that are commercially available.
Embodiment 1
It is 1.5 μm that soft kaolin, which is ground to average grain diameter,；Then it places it in fluidized bed and is roasted in 800 DEG C of fluidizations
It burns 2 hours；Fluosolids roasting mineral are taken out after cooling, and are added in sodium hydroxide solution together with sodium aluminate, stirring is equal
It is even, form slurry.Wherein, silica alumina ratio is 2.0:1 in the slurry, and silicon sodium molar ratio is 0.8:1, and water sodium molar ratio is 45:
1, which is aged 24 hours under room temperature (25 DEG C)；Then the slurry after ageing is placed in crystallization device, with 150r/
The mixing speed of min stirs strongly, and hydrothermal crystallizing 3 hours at 100 DEG C；After crystallization product is cooling, using suction method into
Row is separated by solid-liquid separation, and is obtained solid product, and solid is washed with deionized 3 times, is then dried 2 at 120 DEG C in an oven
Hour to get arrive molecular screen primary powder.Then molecular screen primary powder is mixed with sodium metasilicate (quality of sodium metasilicate be molecular screen primary silty
Amount 20%), then into mixture be added mass fraction for 10% water granulation (water being added herein is so that mixture
Modest viscosity is advisable convenient for molding), and the partical of acquisition is dried at 120 DEG C, by the product after drying at 550 DEG C
Under roast again 2 hours to get arrive the desired molecular sieve desiccant of the present embodiment finished product.
The present embodiment also observes the structure of resulting molecular screen primary powder, the XRD diagram of the molecular screen primary powder such as Fig. 1
It is shown, occur a large amount of sharp peak as shown in Figure 1, it is known that molecular screen primary powder crystallinity with higher；Scanning electron microscope is shone
As shown in Fig. 2, as shown in Figure 2, molecular screen primary powder is mostly the cubic particulate matter that side length is about 2 μm, this shows to utilize this reality piece
The method for applying example offer forms desired molecular sieve structure.The present embodiment is respectively to molecular screen primary powder and molecular sieve desiccant
The static water absorption rate of finished product is determined, the results show that the static water absorption rate of molecular screen primary powder is 25.8%, molecular sieve is dry
The static water absorption rate of agent is 22%.
Embodiment 2
It is 1.8 μm that soft kaolin, which is ground to average grain diameter, then places it in fluidized bed and roasts in 850 DEG C of fluidizations
It burns 2 hours, takes out fluosolids roasting mineral after cooling, and be added in sodium bicarbonate solution together with sodium aluminate, stirring is equal
It is even, form slurry.Wherein, silica alumina ratio is 1.9:1 in the slurry, and silicon sodium molar ratio is 0.8:1, and water sodium molar ratio is 39:
1.The slurry is aged 24 hours under room temperature (23 DEG C), then the slurry after ageing is placed in crystallization device, with 160r/
The mixing speed of min stirs strongly, and hydrothermal crystallizing 4 hours at 100 DEG C；After crystallization product is cooling, using suction method into
Row is separated by solid-liquid separation, and is obtained solid product, and solid is washed with deionized 3 times, is then dried 2 at 120 DEG C in an oven
Hour to get arrive molecular screen primary powder.Then, molecular screen primary powder is mixed to (sodium silicate and attapulgite with compound binding agent
Mass ratio is 1:1, and the quality of compound binding agent is the 15% of molecular screen primary powder quality), quality is then added into mixture
The water that score is 12% is granulated, and the partical of acquisition is dried at 120 DEG C, at 600 DEG C again by the product after drying
Secondary roasting 2 hours to get the finished product for arriving the desired molecular sieve desiccant of the present embodiment.Then respectively to the molecule in the present embodiment
The static water absorption rate of the finished product of sieve original powder and molecular sieve desiccant is determined, the results show that the static of molecular screen primary powder is inhaled
Water rate is 26%, and the static water absorption rate of molecular sieve desiccant is 23%.
Embodiment 3
It is 1.5 μm that gangue, which is ground to average grain diameter,；Then it places it in fluidized bed in 850 DEG C of fluosolids roastings 2
Hour；Fluosolids roasting mineral are taken out after cooling, and are added in sodium hydroxide solution together with aluminium hydroxide, stirring is equal
It is even, form slurry.Wherein, silica alumina ratio is 1.9:1 in the slurry, and silicon sodium molar ratio is 0.8:1, and water sodium molar ratio is 50:
1.The slurry is aged 48 hours under room temperature (24 DEG C), then the slurry after ageing is placed in crystallization device, with 170r/
The mixing speed of min stirs strongly, and hydrothermal crystallizing 4 hours at 100 DEG C；After crystallization product is cooling, using suction method into
Row is separated by solid-liquid separation, and is obtained solid product, and solid is washed with deionized 3 times, is then dried 2 at 120 DEG C in an oven
Hour to get arrive molecular screen primary powder.Then, molecular screen primary powder is mixed to (sodium silicate and attapulgite with compound binding agent
Mass ratio is 1:1, and the quality of compound binding agent is the 10% of molecular screen primary powder quality), quality is then added into mixture
The water that score is 15% is granulated, and the partical of acquisition is dried at 120 DEG C, at 600 DEG C again by the product after drying
Secondary roasting 2 hours to get the finished product for arriving the desired molecular sieve desiccant of the present embodiment.Then respectively to the molecule in the present embodiment
The static water absorption rate of the finished product of sieve original powder and molecular sieve desiccant is determined, the results show that the static of molecular screen primary powder is inhaled
Water rate is 26.5%, and the static water absorption rate of molecular sieve desiccant is 23%.
Embodiment 4
It is 1.8 μm that hard kaoline, which is ground to average grain diameter, then places it in fluidized bed and roasts in 900 DEG C of fluidizations
It burns 2 hours, takes out fluosolids roasting mineral after cooling, and be added in sodium hydroxide solution together with sodium aluminate, stirring is equal
It is even, form slurry.Wherein, silica alumina ratio is 2.1:1 in the slurry, and silicon sodium molar ratio is 0.8:1, and water sodium molar ratio is 55:
1.The slurry is aged 48 hours under room temperature (25 DEG C), then the slurry of ageing is placed in crystallization device, with 180r/
The mixing speed of min stirs strongly and hydrothermal crystallizing 4 hours at 100 DEG C.After crystallization product is cooling, carried out using suction method
It is separated by solid-liquid separation, obtains solid product, and solid is washed with deionized 3 times, then in an oven in 120 DEG C of drying 2h, i.e.,
Obtain molecular screen primary powder.Then molecular screen primary powder is mixed with attapulgite (quality of attapulgite be molecular screen primary powder quality
10%), the water that mass fraction is 18% is then added into mixture and is granulated, and by the partical of acquisition at 120 DEG C
Product after drying is roasted 2 hours again at 600 DEG C to get the desired molecular sieve desiccant of the present embodiment is arrived by drying
Finished product.Then the static water absorption rate of the finished product of molecular screen primary powder and molecular sieve desiccant in the present embodiment is surveyed respectively
Fixed, the results show that the static water absorption rate of molecular screen primary powder is 25.5%, the static water absorption rate of molecular sieve desiccant is 22.5%.
The foregoing is merely presently preferred embodiments of the present invention, the protection scope being not intended to limit the invention, all in this hair
Within bright spirit and principle, any modification, equivalent replacement, improvement and so on should be included in protection scope of the present invention
Within.
Claims (5)
1. a kind of preparation method of gas dehydration molecular sieve desiccant, which is characterized in that the described method includes:
After kaolin starting material is ground to 2 μm hereinafter, carrying out fluosolids roasting in fluidized bed, addition silicon source, sodium source mix shape
At slurry, successively the slurry is aged, hydrothermal crystallizing, separation of solid and liquid, obtains isolated solid product, it is then right
The solid product is successively washed, is dried, and molecular screen primary powder is obtained, then to acid-resisting is added in the molecular screen primary powder
Binder carries out forming processes, and drying obtains gas dehydration molecular sieve desiccant after roasting again；
In the slurry, SiO2/Al2O3Molar ratio be 2.0~2.1:1, SiO2/Na2O molar ratio is 0.6~0.8:1, H2O/
Na2O molar ratio is 30~45:1；
The acid-resisting binder is attapulgite and/or sodium metasilicate, and the addition quality of the acid-resisting binder is described point
The 10%~35% of son sieve original powder quality；
The kaolin starting material is selected from least one of soft kaolin, hard kaoline, gangue；
The temperature of the fluosolids roasting is 850~1000 DEG C, and the time is 1.5~3 hours；
The time of the ageing is at least 12 hours；
The temperature of the hydrothermal crystallizing is 70~100 DEG C, and the time is 3 or 4 hours.
2. preparation method according to claim 1, which is characterized in that source of aluminium be selected from aluminum sulfate, aluminium hydroxide, intend it is thin
At least one of diaspore and sodium aluminate.
3. preparation method according to claim 1, which is characterized in that the sodium source is selected from sodium hydroxide, sodium carbonate and carbon
At least one of sour hydrogen sodium.
4. preparation method according to claim 1, which is characterized in that the time of the ageing is at least 48 hours.
5. preparation method according to claim 1, which is characterized in that the temperature of the drying is 120 DEG C, described to roast again
The temperature of burning is 450~900 DEG C, and the time is 1.5~3 hours.
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