CN107285337A - A kind of 4A molecular sieves and preparation method thereof - Google Patents
A kind of 4A molecular sieves and preparation method thereof Download PDFInfo
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- CN107285337A CN107285337A CN201610228003.XA CN201610228003A CN107285337A CN 107285337 A CN107285337 A CN 107285337A CN 201610228003 A CN201610228003 A CN 201610228003A CN 107285337 A CN107285337 A CN 107285337A
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- C01B39/00—Compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites; Their preparation; After-treatment, e.g. ion-exchange or dealumination
- C01B39/02—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof; Direct preparation thereof; Preparation thereof starting from a reaction mixture containing a crystalline zeolite of another type, or from preformed reactants; After-treatment thereof
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Abstract
Field is utilized the present invention relates to coal resource, a kind of 4A molecular sieves and preparation method thereof are disclosed, this method includes：White clay is reacted with alkali lye, Silicon-rich filtrate is obtained；And liquor alumini chloridi is crystallized and is calcined successively, obtain the solid product of rich aluminium；Then under the conditions of hydrothermal synthesis reaction, the solid product of the Silicon-rich filtrate and the rich aluminium is contacted, and the product obtained after the contact is subjected to crystallization and filtering successively, wherein, the liquor alumini chloridi and the white clay are respectively and carry out acid system successively by the material containing flyash to carry the filtrate obtained after aluminium and filtering and filter residue.The method of the present invention can make full use of flyash acid system to carry the by-product after aluminium on the premise of avoiding or reducing NaCl generation, obtain the 4A molecular sieves of high heap density, significantly reduce production cost, and improve the comprehensive utilization ratio of flyash.
Description
Technical field
Field is utilized the present invention relates to coal resource, in particular it relates to a kind of method for preparing 4A molecular sieves
And the 4A molecular sieves prepared by this method.
Background technology
The three-dimensional framework shape structural compounds that 4A zeolites are made up of silica and aluminum-oxygen tetrahedron, category cube
Crystallographic system, structure cell center is one a diameter ofHole, it is similar by 8 yuan of rings and 6
Hole is formed by connecting, and the free hole of this 8 ring structure formation is a diameter ofTherefore referred to as 4A
Zeolite.It is a kind of nontoxic, odorless, the preferable white powder of tasteless and mobility, adsorption ability
By force, it is preferable adsorbent and drier.
Flyash is the main discarded object of firepower electrical plant, and its discharge capacity increases year by year.The profit of China's flyash
Not high with rate, the flyash of substantial amounts of accumulation causes to seriously endanger to environment.In some coalfields, coal and
There is very high aluminium content in kaolin association, the obtained flyash after such coal burning, reached
Aluminium content in medium taste bauxite.
The mineral resources such as aluminum oxide are extracted from flyash numerous studies, and wherein acidity extraction is aoxidized
Aluminium has the features such as technique is simple, recovery rate is high, is widely used.This method is extracted after aluminum oxide, is remained
Remaining about 56% residue, usual residue is referred to as white clay, therefore effective utilization of white clay and dissolves and be also
The problem of urgent need to resolve.
The main component of white clay is SiO2And Al2O3And the oxide after inorganic mineral calcination etc., wherein
SiO2Content be up to about 70%, be the suitable silicon sources of synthesis zeolite.Meanwhile, the filter after acidleach
Contain substantial amounts of Al in liquid, and with AlCl3Form is present in filtrate.
Current synthesis technique is directly to use AlCl3Molecular sieve is prepared as silicon source, but the reaction is in generation
While molecular sieve, substantial amounts of salt can be produced, when generating 1 ton of 4A zeolite, while generating 1.2 tons of NaCl.
It is shown below：
2SiO2+2AlCl3+ 8NaOH=Na2Si2Al2O8(Na-A)+6NaCl+4H2O
CN103738977A disclose a kind of method that 4A type molecular sieves are prepared by raw material of white clay and by
Product prepared by this method, and specifically disclose the method that uses additional sodium metaaluminate for silicon source to avoid
NaCl generation is with synthetic zeolite.However, the 4A molecules obtained using the method synthesis of the prior art
The heap density of sieve is generally in the range of 0.43-0.72g/mL, and this method production cost is higher.
The content of the invention
The purpose of the present invention is to overcome the 4A prepared points existed when preparing 4A molecular sieves by white clay
The relatively low defect of the sub heap density sieved, is prepared on the premise of avoiding producing a large amount of sodium chloride there is provided one kind
The method of the 4A molecular sieves of higher heap density.
To achieve these goals, in a first aspect, the present invention provides a kind of method for preparing 4A molecular sieves,
This method includes：White clay is reacted with alkali lye, Silicon-rich filtrate is obtained；And by liquor alumini chloridi according to
It is secondary to be crystallized and be calcined, obtain the solid product of rich aluminium；Then, will be described under the conditions of hydrothermal synthesis reaction
Silicon-rich filtrate is contacted with the solid product of the rich aluminium, and the product obtained after the contact is carried out successively
Crystallization and filtering, wherein, the liquor alumini chloridi and the white clay are respectively by the material containing flyash
Acid system is carried out successively carries the filtrate obtained after aluminium and filtering and filter residue.
Second aspect, the present invention provides the 4A molecular sieves prepared by preceding method.
The present invention by using by coal ash for manufacturing for the AlCl obtained during white clay3By-product and acid system are carried
The white clay obtained during aluminium prepare obtaining 4A molecular sieves.The 4A obtained by this method
The heap density of molecular sieve is higher, and the Static Water of the 4A molecular sieves obtained by this method of the present invention is adsorbed
Rate is higher.
The present inventor passes through one of many experiments and research discovery, important factor in order of heap density
To control its particle diameter distribution, that is, prepare existing big particle diameter also have one of small particle 4A molecular sieves it is suitable
Particle size distribution range.The crystallization and roasting of solid-state silicon source are optimized with it is improved on the basis of, throw
Plus controlling crystallizing condition, in preferred scope, enables to the method for the present invention to prepare during silicon source
4A molecular sieves heap density it is higher.
In addition, the preceding method of the present invention can fill on the premise of avoiding or reducing NaCl generation
Divide and carry the by-product after aluminium using flyash acid system, significantly reduce production cost, and improve flyash
Comprehensive utilization ratio.
For the existing technology for preparing 4A molecular sieves, method of the invention significantly improves work
The heap density of 4A molecular sieves, has the advantages that economic, practical in industry reactor.In addition, in this hair
Without additional sodium metaaluminate in bright, so as to reduce further production cost.
The preceding method of the present invention is also with technique is simple, output per single reactor is high, with low cost and environment-friendly
The advantages of.
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 embodiment is used to explain the present invention together, but is not construed as limiting the invention.
In accompanying drawing：
Fig. 1 is the XRD of the 4A molecular sieves prepared by the method for embodiments of the invention 1.
Fig. 2 is the SEM figures of the 4A molecular sieves prepared by the method for embodiments of the invention 1.
Embodiment
The embodiment to the present invention is described in detail below.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.
The end points and any value of disclosed scope are not limited to the accurate scope or value herein, this
A little scopes or value should be understood to comprising the value close to these scopes or value.For number range, respectively
Between the endpoint value of individual scope, between the endpoint value of each scope and single point value, and individually point
Can be combined with each other between value and obtain one or more new number ranges, these number ranges should by regarding
For specific disclosure herein.
In a first aspect, the invention provides a kind of method for preparing 4A molecular sieves, this method includes：Will
White clay is reacted with alkali lye, obtains Silicon-rich filtrate；And liquor alumini chloridi is crystallized and roasted successively
Burn, obtain the solid product of rich aluminium；Then under the conditions of hydrothermal synthesis reaction, by the Silicon-rich filtrate with it is described
The solid product of rich aluminium is contacted, and the product obtained after the contact is carried out into crystallization and filtering successively, its
In, the liquor alumini chloridi and the white clay are respectively to carry out acid system successively by the material containing flyash to carry
The filtrate obtained after aluminium and filtering and filter residue.
Contain the substantial amounts of SiO with reactivity in the white clay2, by with alkaline reaction and filter
Afterwards, filtrate is containing a large amount of Na2SiO3Solution.
Preferably, the condition liquor alumini chloridi crystallized includes：Temperature is 100-160 DEG C,
More preferably 120-140 DEG C.
Preferably, the condition that products therefrom is calcined after the liquor alumini chloridi is crystallized includes：
Temperature is 150-400 DEG C, and the time is 10-100min.It is further preferred that the liquor alumini chloridi is crystallized
The condition that products therefrom is calcined afterwards includes：Temperature is 200-350 DEG C, and the time is 20-60min.
After the solid product of the Silicon-rich filtrate and the rich aluminium is contacted under the conditions of hydrothermal synthesis reaction
The product of acquisition is silicon-aluminum sol.Preferably, in the hydrothermal synthesis reaction, the Silicon-rich filtrate
To contain in the product (i.e. silicon-aluminum sol) obtained after the contact with the consumption of the solid product of the rich aluminium
Respectively with Na2O、Al2O3And SiO2The mol ratio of meter is 1.2-7：1：1.2-2.5 Na elements, Al
Element and Si elements；It is further preferred that containing in the silicon-aluminum sol respectively with Na2O、Al2O3And SiO2
The mol ratio of meter is 2.4-3.2：1：1.8-2.1 Na elements, Al elements and Si elements；And institute
State in the product obtained after contact, with Al2O3The Al elements and H of meter2O mol ratio is 1：40-420；
More preferably 1：190-375.
The Silicon-rich filtrate can be contacted in the basic conditions with the solid product of the rich aluminium.Preferably,
The condition that the solid product of the Silicon-rich filtrate and the rich aluminium is contacted includes：Temperature is 0-50 DEG C, when
Between be 2-60min；The condition of more preferably described contact includes：Temperature is 15-40 DEG C, and the time is
15-30min。
Preferably, the condition for the product obtained after the contact being carried out into crystallization includes：Temperature is
80-120 DEG C, the time is 6-24h.
The step of acid system carries aluminium can include：Material containing flyash is carried out in acid condition
Mixing.Preferably, the acid condition is formed by the presence of acid solution, and the hydrogen in the acid condition
Ion concentration is 1-12mol/L.The acid solution can produce hydrionic solution to be various, for example
Can be hydrochloric acid, sulfuric acid, nitric acid etc..The preferably acid solution of the invention is hydrochloric acid and/or sulfuric acid.To hydrochloric acid
There is no particular limitation with the concentration of sulfuric acid, as long as can to obtain this hair by the hydrochloric acid and/or sulfuric acid
Bright foregoing acid condition.
Preferably, the condition material containing flyash mixed in acid condition includes：Temperature
For 60-200 DEG C, the time is 0.2-2h.
The reaction that the white clay and alkali lye are carried out can by by white clay and alkaline matter in solvent such as water
In the presence of reacted to realize.Preferably, the condition that white clay and alkali lye are reacted is included：Temperature
Spend for 40-200 DEG C, the time is 5-150min；More preferably the condition that white clay and alkali lye are reacted is included：
Temperature is 80-120 DEG C, and the time is 15-60min.
Preferably, the consumption of the alkali lye make it that element silicon is with SiO in the Silicon-rich filtrate prepared2Meter
Content be 80-160g/L.
Preferably, method of the invention further comprises：Before hydrothermal synthesis reaction is carried out, institute is adjusted
The basicity for stating Silicon-rich filtrate is 1-5mol/L；Preferably 2.9-3.3mol/L.
Preferably, contain in the white clay with the 15-45 weight % of white clay gross weight meter Al2O3、40-70
Weight % SiO2, 0-5 weight % P2O5, 0-3 weight % K2O, 0-4 weight % CaO,
0-5 weight % TiO2, 0-3 weight % Fe2O3, 0-2 weight % SrO, 0-2 weight % ZrO2、
0-3 weight % Na2O and 0.01-8 weight % C.
Preferably, contain in the flyash with the 20-55 weight % of flyash gross weight meter Al2O3、
10-45 weight % SiO2, 0-5 weight % P2O5, 0-3 weight % K2O, 0-10 weight %'s
CaO, 0-5 weight % TiO2, 0-5 weight % Fe2O3, 0-2 weight % SrO, 0-1 weight %
ZrO2, 0-2 weight % Na2O and 0.01-30 weight % C.
Second aspect, the invention provides the 4A molecular sieves prepared by preceding method.
Preferably, the unit volume water absorption rate of the 4A molecular sieves is 230-290g/L, and heap density is
0.8-1.0g/mL, the unit volume water absorption rate passes through by the molecular sieve Static Water determining adsorptions of GB/T 6287
The static water absorption that method is measured is calculated and obtained.
The present invention will be described in detail by way of examples below.
In case of no particular description, various raw materials used below are all from commercially available.
Every part represents 1g below.
Flyash used below comes from the quasi- Ge Er limited energies company Gangue Power Plant of Shenhua.
The composition and its content (weight %) of flyash used below are shown in table 1.
The heap density of following molecular sieve is used《The molecular sieve sedimentating density measuring methods of GB/T 6286》Determine；
Static water absorption is used《The molecular sieve Static Water determining adsorption methods of GB/T 6287》Determine.
Table 1
| Element | Al2O3 | SiO2 | P2O5 | K2O | CaO | TiO2 | Fe2O3 | Na2O | C | It is other |
| Content | 51.99 | 38.83 | 0.80 | 0.26 | 1.79 | 2.15 | 0.56 | 0.48 | 2.49 | 0.65 |
Preparation example 1-3 is used for by coal ash for manufacturing for white clay；Embodiment 1-6 is used for the preparation for illustrating the present invention
The method of 4A molecular sieves and the 4A molecular sieves prepared by this method.
Preparation example 1
Flyash in 100 parts of table 1 is placed in 400 parts of 28 weight % aqueous hydrochloric acid solution
Row reaction, the temperature of reaction is 80 DEG C, and the time is 1h；Then the mixture obtained after reaction is carried out
Filtering, respectively obtains the liquor alumini chloridi as filtrate and the white clay as filter residue, the composition of the white clay
And content (weight %) is shown in table 2.
Preparation example 2
Flyash in 100 parts of table 1 is placed in 400 parts of 25 weight % aqueous hydrochloric acid solution
Row reaction, the temperature of reaction is 60 DEG C, and the time is 2h；Then the mixture obtained after reaction is carried out
Filtering, respectively obtains the liquor alumini chloridi as filtrate and the white clay as filter residue, the composition of the white clay
And content (weight %) is shown in table 2.
Preparation example 3
Flyash in 100 parts of table 1 is placed in 400 parts of 40 weight % aqueous sulfuric acid
Row reaction, the temperature of reaction is 120 DEG C, and the time is 0.8h；Then the mixture obtained after reaction is entered
Row filtering, respectively obtains the liquor alumini chloridi as filtrate and the white clay as filter residue, the group of the white clay
Into and content (weight %) shown in table 2.
Table 2
| Al2O3 | SiO2 | P2O5 | K2O | CaO | TiO2 | TFe2O3 | Na2O | C | It is other | |
| Preparation example 1 | 27.87 | 63.66 | 1.10 | 0.40 | 2.03 | 2.74 | 0.62 | 0.52 | 0.35 | 0.71 |
| Preparation example 2 | 27.52 | 63.98 | 1.08 | 0.50 | 1.98 | 2.78 | 0.71 | 0.49 | 0.31 | 0.65 |
| Preparation example 3 | 27.34 | 64.02 | 1.12 | 0.45 | 2.09 | 2.70 | 0.68 | 0.56 | 0.36 | 0.68 |
Embodiment 1
White clay that 50 parts are obtained by preparation example 1,40 parts of solid NaOH (also referred to as piece alkali), 200
Part water is mixed (quality meter), in reacting 30min at 95 DEG C, is filtered, is obtained element silicon with SiO2
The content of meter is 120g/L Silicon-rich filtrate.Using triple effect evaporation by the liquor alumini chloridi in preparation example 1
Progress is crystallized at 120 DEG C, obtains Aluminium chloride hexahydrate；Then the Aluminium chloride hexahydrate is existed
60min is calcined at 300 DEG C, the solid product of rich aluminium is obtained.
The Silicon-rich filtrate of 9.5 parts of the present embodiment is mixed with 34 parts of water, and adds 0.4 part of piece alkali, stirring
After uniform, the solid product of rich aluminium of 1 part of the present embodiment is added, stirring reaction 25min, is obtained at 25 DEG C
Respectively with Na in silicon-aluminum sol, gained silicon-aluminum sol2O、Al2O3And SiO2Na elements, the Al of meter
Element and Si elements and H2O molar ratio is 2.8：1：2：280；By gained silicon-aluminum sol after
Continuous stirring, in crystallization 10h at 95 DEG C, filters, washs, dry, obtain 4A molecular sieves Z1.
As a result：4A molecular sieves Z1 XRD by XRD interpretations of result as shown in figure 1, obtained
Z1 crystallinity is 99.2%；And understand to contain with oxygen in 4A molecular sieves Z1 by XRF analysis
The weight % of compound meter 21.22 Na elements, in terms of oxide 36.87 weight % Al elements, with oxygen
The weight % of compound meter 41.31 Si elements, 0.38 weight % chlorine element, with Fe2O3Count 0.018 weight %
Fe elements, in terms of oxide 0.011 weight % Ca elements and 0.19 weight % other materials；
4A molecular sieves Z1 SEM figures are as shown in Figure 2.4A molecular sieves Z1 is prepared by the method for the present embodiment
When obtain 0.07 part of byproduct sodium chloride.Z1 heap density is 1.0g/mL, and unit volume water absorption rate is
281.0g/L。
The heap density of commercially available 4A molecular screen primary powders is tested using identical assay method generally not higher than
0.72g/mL, typically in the range of 0.4-0.72g/mL, unit volume water absorption rate is generally in 50-195g/L
In the range of.
By contrast as can be seen that the unit volume of the 4A molecular sieves obtained using the method for the present embodiment
Water absorption rate is substantially higher than the unit volume water absorption rate of commercially available 4A molecular screen primary powders, is illustrated by the present invention
Method obtain 4A molecular sieves quality it is higher compared with the quality of commercially available prod.
Embodiment 2
White clay, 35 parts of solid NaOH, the 200 parts of water that 50 parts are obtained by preparation example 2 are mixed
Close (quality meter), in reacting 55min at 85 DEG C, filter, obtain element silicon with SiO2The content of meter is
117g/L Silicon-rich filtrate.The liquor alumini chloridi in preparation example 2 is carried out at 130 DEG C using triple effect evaporation
It is lower to be crystallized, obtain Aluminium chloride hexahydrate；Then the Aluminium chloride hexahydrate is calcined at 200 DEG C
60min, obtains the solid product of rich aluminium.
The Silicon-rich filtrate of 6.4 parts of the present embodiment is mixed with 24 parts of water, and adds 0.4 part of piece alkali, stirring
After uniform, the solid product of rich aluminium of 1 part of the present embodiment is added, stirring reaction 15min, is obtained at 30 DEG C
Respectively with Na in silicon-aluminum sol, gained silicon-aluminum sol2O、Al2O3And SiO2Na elements, the Al of meter
Element and Si elements and H2O molar ratio is 2.4：1：1.8：190；By gained silicon-aluminum sol
Continue to stir, in crystallization 8h at 110 DEG C, filter, wash, dry, obtain 4A molecular sieves Z2.
As a result：4A molecular sieves Z2 XRD and SEM figure divides with the 4A in embodiment 1 respectively
Son sieve Z1 Fig. 1 is similar with Fig. 2, and crystallinity is 99.1%.4A points are prepared by the method for the present embodiment
0.08 part of byproduct sodium chloride is obtained during son sieve Z2.The heap density of the 4A molecular sieves is 1.0g/mL, unit
Volume water absorption rate is 280.2g/L.
Embodiment 3
White clay, 45 parts of solid NaOH, the 200 parts of water that 50 parts are obtained by preparation example 3 are mixed
Close (quality meter), in reacting 20min at 100 DEG C, filter, obtain element silicon with SiO2The content of meter
For 125g/L Silicon-rich filtrate.Liquor alumini chloridi in preparation example 3 is carried out to be crystallized at 140 DEG C,
Obtain Aluminium chloride hexahydrate；Then the Aluminium chloride hexahydrate is calcined 20min at 350 DEG C, obtains richness
The solid product of aluminium.
The Silicon-rich filtrate of 7.5 parts of the present embodiment is mixed with 51 parts of water, and adds 0.7 part of piece alkali, stirring
After uniform, the solid product of rich aluminium of 1 part of the present embodiment is added, in 20 times stirring reaction 30min, is obtained
Respectively with Na in silicon-aluminum sol, gained silicon-aluminum sol2O、Al2O3And SiO2Na elements, the Al of meter
Element and Si elements and H2O molar ratio is 3.2：1：2.1：375；By gained silicon-aluminum sol
Continue to stir, in crystallization 12h at 90 DEG C, filter, wash, dry, obtain 4A molecular sieves Z3.
As a result：4A molecular sieves Z3 XRD and SEM figure divides with the 4A in embodiment 1 respectively
Son sieve Z1 Fig. 1 is similar with Fig. 2, and crystallinity is 99.2%.4A points are prepared by the method for the present embodiment
0.08 part of byproduct sodium chloride is obtained during son sieve Z3.The heap density of the 4A molecular sieves is 1.0g/mL, unit
Volume water absorption rate is 279.3g/L.
Embodiment 4
The present embodiment is carried out using method similar to Example 1, except that：
The Silicon-rich filtrate of 4.3 parts of the present embodiment is mixed with 3 parts of water, and adds 0.01 part of piece alkali, stirring
After uniform, the solid product of rich aluminium of 1 part of the present embodiment is added, stirring reaction 25min, is obtained at 25 DEG C
Respectively with Na in silicon-aluminum sol, gained silicon-aluminum sol2O、Al2O3And SiO2Na elements, the Al of meter
Element and Si elements and H2O molar ratio is 1.2：1：1.2：40；By gained silicon-aluminum sol after
Continuous stirring, in crystallization 10h at 95 DEG C, filters, washs, dry, obtain 4A molecular sieves Z4.
As a result：4A molecular sieves Z4 XRD and SEM figure divides with the 4A in embodiment 1 respectively
Son sieve Z1 Fig. 1 is similar with Fig. 2, and crystallinity is 99.0%.4A points are prepared by the method for the present embodiment
0.08 part of byproduct sodium chloride is obtained during son sieve Z4.The heap density of the 4A molecular sieves is 0.9g/mL, unit
Volume water absorption rate is 252.4g/L.
The product and commercial goods for contrasting the present embodiment understand that the heap density of the product of the present embodiment is higher,
And the water absorption rate of unit volume is higher.
The product for contrasting the present embodiment and embodiment 1 is understood, in byproduct sodium chloride yield on the premise of,
The product of embodiment 1 is higher compared with the heap density and unit volume water absorption rate of the product of the present embodiment.
Embodiment 5
The present embodiment is carried out using method similar to Example 2, except that：
In the present embodiment, Aluminium chloride hexahydrate is calcined 60min at 400 DEG C.
Remaining is in the same manner as in Example 2.Obtain 4A molecular sieves Z5.
As a result：4A molecular sieves Z5 XRD and SEM figure divides with the 4A in embodiment 1 respectively
Son sieve Z1 Fig. 1 is similar with Fig. 2, and crystallinity is 99.0%.4A points are prepared by the method for the present embodiment
0.11 part of byproduct sodium chloride is obtained during son sieve Z5.The heap density of the 4A molecular sieves is 0.81g/mL, single
Volume water absorption rate in position is 241.75g/L.
The product and commercial goods for contrasting the present embodiment understand that the heap density of the product of the present embodiment is higher.
Knowable to the product for contrasting the present embodiment and embodiment 2, production of the product compared with the present embodiment of embodiment 2
The heap density of product is higher, and byproduct sodium chloride yield is lower.
Embodiment 6
The present embodiment is carried out using method similar to Example 5, except that：
In the present embodiment, Aluminium chloride hexahydrate is calcined 20min at 400 DEG C.
Remaining is in the same manner as in Example 5.Obtain 4A molecular sieves Z6.
As a result：4A molecular sieves Z6 XRD and SEM figure divides with the 4A in embodiment 1 respectively
Son sieve Z1 Fig. 1 is similar with Fig. 2, and crystallinity is 99.0%.4A points are prepared by the method for the present embodiment
0.11 part of byproduct sodium chloride is obtained during son sieve Z6.The heap density of the 4A molecular sieves is 0.8g/mL, unit
Volume water absorption rate is 241.38g/L.
The product and commercial goods for contrasting the present embodiment understand that the heap density of the product of the present embodiment is higher.
Knowable to the product for contrasting the present embodiment and embodiment 2, production of the product compared with the present embodiment of embodiment 2
The heap density of product is higher, and the byproduct sodium chloride yield of the product of embodiment 2 is lower.
Knowable to the product for contrasting the present embodiment and embodiment 5, both unit volume water absorption rates and by-product
Sodium chloride output is suitable.
Comparative example 1
This comparative example is carried out using method similar to Example 1, except that：
By the Aluminium chloride hexahydrates of the Silicon-rich filtrate of 9.5 parts of embodiments 1 and 4.8 parts of embodiments 1 (without
Roasting) it is stirred reaction.
Remaining is in the same manner as in Example 1.Obtain 4A molecular sieves D-Z1.
As a result：4A molecular sieves D-Z1 XRD and SEM figure respectively with the 4A in embodiment 1
Molecular sieve Z1 Fig. 1 is similar with Fig. 2, and crystallinity is 99.0%.4A is prepared by the method for this comparative example
3.5 parts of byproduct sodium chloride is obtained during molecular sieve D-Z1.The heap density of the 4A molecular sieves is 0.72g/mL,
Unit volume water absorption rate is 198.0g/L.
Comparative example 2
This comparative example is carried out using method similar to Example 1, except that：
The Silicon-rich filtrate of 9.5 parts of embodiments 1 and the Aluminium chloride hexahydrate (not fired) of 3.2 parts of embodiments 1
It is stirred reaction.
Remaining is in the same manner as in Example 1.Obtain 4A molecular sieves D-Z2.
As a result：4A molecular sieves D-Z2 XRD and SEM figure respectively with the 4A in embodiment 1
Molecular sieve Z1 Fig. 1 is similar with Fig. 2, and crystallinity is 99.0%.4A is prepared by the method for this comparative example
3.5 parts of byproduct sodium chloride is obtained during molecular sieve D-Z2.The heap density of the 4A molecular sieves is 0.46g/mL,
Unit volume water absorption rate is 112.7g/L.
The method provided it can be seen from the result of above-described embodiment and comparative example using the present invention is prepared into
The condition of the 4A molecular sieves arrived is preferable, and heap density is high compared with prior art；And, using the present invention's
It is substantially lower compared with prior art that method prepares the sodium chloride by-product obtained during 4A molecular sieves；Moreover, this hair
Bright method avoids additional sodium metaaluminate by using the by-product during carrying aluminium by flyash acid system,
So as to further save production cost.
The preferred embodiment of the present invention described in detail above, still, the present invention are not limited to above-mentioned reality
The detail in mode is applied, can be to technical side of the invention in the range of the technology design of the present invention
Case carries out a variety of simple variants, and these simple variants belong to protection scope of the present invention.
It is further to note that each particular technique described in above-mentioned embodiment is special
Levy, in the case of reconcilable, can be combined by any suitable means, in order to avoid need not
The repetition wanted, the present invention no longer separately illustrates to various possible combinations.
In addition, various embodiments of the present invention can be combined randomly, as long as its
Without prejudice to the thought of the present invention, it should equally be considered as content disclosed in this invention.
Claims (15)
1. a kind of method for preparing 4A molecular sieves, it is characterised in that this method includes：By white clay and alkali
Liquid is reacted, and obtains Silicon-rich filtrate；And liquor alumini chloridi is crystallized and is calcined successively, obtain
The solid product of rich aluminium；Then under the conditions of hydrothermal synthesis reaction, the Silicon-rich filtrate is produced admittedly with the rich aluminium
Thing is contacted, and the product obtained after the contact is carried out into crystallization and filtering successively, wherein, it is described
Liquor alumini chloridi and the white clay are respectively to carry out acid system successively by the material containing flyash to carry aluminium and mistake
The filtrate obtained after filter and filter residue.
2. according to the method described in claim 1, wherein, the liquor alumini chloridi is crystallized
Condition includes：Temperature is 100-160 DEG C, preferably 120-140 DEG C.
3. according to the method described in claim 1, wherein, after the liquor alumini chloridi is crystallized
The condition that products therefrom is calcined includes：Temperature is 150-400 DEG C, and the time is 10-100min；It is preferred that
Ground
The condition that products therefrom is calcined after the liquor alumini chloridi is crystallized includes：Temperature is
200-350 DEG C, the time is 20-60min.
4. the method according to any one in claim 1-3, wherein, in the Hydrothermal Synthesiss
In reaction, the Silicon-rich filtrate and the consumption of the solid product of the rich aluminium cause the product obtained after the contact
In contain respectively with Na2O、Al2O3And SiO2The mol ratio of meter is 1.2-7：1：1.2-2.5 Na member
Element, Al elements and Si elements；Preferred molar ratio is 2.4-3.2：1：1.8-2.1；And
In the product obtained after the contact, with Al2O3The Al elements and H of meter2O mol ratio is
1：40-420；Preferably 1：190-375.
5. the method according to any one in claim 1-4, wherein, by the Silicon-rich filtrate
The condition contacted with the solid product of the rich aluminium includes：Temperature is 0-50 DEG C, and the time is 2-60min；
It is preferred that the condition of the contact includes：Temperature is 15-40 DEG C, and the time is 15-30min.
6. the method according to claim 1-4 kind any one, wherein, it will be obtained after the contact
To product carry out crystallization condition include：Temperature is 80-120 DEG C, and the time is 6-24h.
7. according to the method described in claim 1, wherein, the step of acid system carries aluminium includes：Will
Material containing flyash is mixed in acid condition；Preferably
The acid condition is formed by the presence of acid solution, and the hydrogen ion concentration in the acid condition is
1-12mol/L。
8. method according to claim 7, wherein, by the material containing flyash in acid bar
The condition mixed under part includes：Temperature is 60-200 DEG C, and the time is 0.2-2h.
9. the method according to any one in claim 1-4, wherein, white clay is entered with alkali lye
The condition of row reaction includes：Temperature is 40-200 DEG C, and the time is 5-150min；Preferably
The condition that white clay and alkali lye are reacted is included：Temperature is 80-120 DEG C, and the time is 15-60min.
10. the method according to any one in claim 1-4 and 9, wherein, the alkali lye
Consumption make it that element silicon is with SiO in the Silicon-rich filtrate prepared2The content of meter is 80-160g/L.
11. according to the method described in claim 1, wherein, this method further comprises：Entering water-filling
Before thermal synthesis reaction, the basicity for adjusting the Silicon-rich filtrate is 1-5mol/L；Preferably
2.9-3.3mol/L。
12. according to the method described in claim 1, wherein, in the white clay contain with white clay gross weight
The 15-45 weight % of meter Al2O3, 40-70 weight % SiO2, 0-5 weight % P2O5, 0-3 weight
Measure % K2O, 0-4 weight % CaO, 0-5 weight % TiO2, 0-3 weight % Fe2O3、0-2
Weight % SrO, 0-2 weight % ZrO2, 0-3 weight % Na2O and 0.01-8 weight % C.
13. according to the method described in claim 1, wherein, in the flyash contain with flyash it is total
The 20-55 weight % of weight meter Al2O3, 10-45 weight % SiO2, 0-5 weight % P2O5、
0-3 weight % K2O, 0-10 weight % CaO, 0-5 weight % TiO2, 0-5 weight % Fe2O3、
0-2 weight % SrO, 0-1 weight % ZrO2, 0-2 weight % Na2O and 0.01-30 weight %
C.
14. the 4A molecular sieves prepared as the method described in any one in claim 1-13.
15. 4A molecular sieves according to claim 14, wherein, the unit bodies of the 4A molecular sieves
Product water absorption rate be 230-290g/L, heap density be 0.8-1.0g/mL, the unit volume water absorption rate by by
The static water absorption that the molecular sieve Static Water determining adsorption methods of GB/T 6287 are measured is calculated and obtained.
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| CN109437223A (en) * | 2018-11-06 | 2019-03-08 | 中国神华能源股份有限公司 | It is a kind of to utilize Al-SBA-15 molecular sieve made from white clay and preparation method thereof |
| CN113144818A (en) * | 2021-04-29 | 2021-07-23 | 华电宁夏灵武发电有限公司 | Fly ash-based carbon dioxide absorption system and fly ash recycling method for absorbing carbon dioxide |
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| CN101367529A (en) * | 2008-09-28 | 2009-02-18 | 西安建筑科技大学 | Method for synthesis of 4A molecular sieve with coal ash alkali melting method |
| CN101406825A (en) * | 2008-11-07 | 2009-04-15 | 中南大学 | Method for synthesizing 4A molecular sieve drier using kaoline |
| CN101445254A (en) * | 2008-12-31 | 2009-06-03 | 平朔煤炭工业公司 | Method for producing 4A molecular sieve |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101367529A (en) * | 2008-09-28 | 2009-02-18 | 西安建筑科技大学 | Method for synthesis of 4A molecular sieve with coal ash alkali melting method |
| CN101406825A (en) * | 2008-11-07 | 2009-04-15 | 中南大学 | Method for synthesizing 4A molecular sieve drier using kaoline |
| CN101445254A (en) * | 2008-12-31 | 2009-06-03 | 平朔煤炭工业公司 | Method for producing 4A molecular sieve |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109437223A (en) * | 2018-11-06 | 2019-03-08 | 中国神华能源股份有限公司 | It is a kind of to utilize Al-SBA-15 molecular sieve made from white clay and preparation method thereof |
| CN113144818A (en) * | 2021-04-29 | 2021-07-23 | 华电宁夏灵武发电有限公司 | Fly ash-based carbon dioxide absorption system and fly ash recycling method for absorbing carbon dioxide |
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