CN112047354A - Sodium bentonite, preparation method thereof and ultrasonic roller-pair rolling machine - Google Patents
Sodium bentonite, preparation method thereof and ultrasonic roller-pair rolling machine Download PDFInfo
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- CN112047354A CN112047354A CN201910492551.7A CN201910492551A CN112047354A CN 112047354 A CN112047354 A CN 112047354A CN 201910492551 A CN201910492551 A CN 201910492551A CN 112047354 A CN112047354 A CN 112047354A
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- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical compound O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 229910000280 sodium bentonite Inorganic materials 0.000 title claims abstract description 34
- 229940080314 sodium bentonite Drugs 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 238000005096 rolling process Methods 0.000 title description 6
- 239000011734 sodium Substances 0.000 claims abstract description 42
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 35
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 28
- 229940092782 bentonite Drugs 0.000 claims abstract description 25
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 25
- 239000000440 bentonite Substances 0.000 claims abstract description 25
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000002689 soil Substances 0.000 claims abstract description 25
- 239000011265 semifinished product Substances 0.000 claims abstract description 18
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 17
- 239000002002 slurry Substances 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 14
- 238000002156 mixing Methods 0.000 claims abstract description 13
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000011575 calcium Substances 0.000 claims abstract description 11
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 11
- 238000010298 pulverizing process Methods 0.000 claims abstract description 8
- 239000012528 membrane Substances 0.000 claims abstract description 6
- 238000001035 drying Methods 0.000 claims abstract description 5
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 18
- 239000000843 powder Substances 0.000 claims description 14
- 230000000694 effects Effects 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 9
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 9
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 7
- 239000011707 mineral Substances 0.000 claims description 7
- FQENQNTWSFEDLI-UHFFFAOYSA-J sodium diphosphate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])([O-])=O FQENQNTWSFEDLI-UHFFFAOYSA-J 0.000 claims description 6
- 235000019830 sodium polyphosphate Nutrition 0.000 claims description 6
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 6
- 229940048086 sodium pyrophosphate Drugs 0.000 claims description 5
- 235000019818 tetrasodium diphosphate Nutrition 0.000 claims description 5
- 238000001125 extrusion Methods 0.000 claims description 4
- 238000007873 sieving Methods 0.000 claims description 3
- ZBYSZWDYDUIDAZ-UHFFFAOYSA-M sodium octadec-2-enoate Chemical compound [Na+].CCCCCCCCCCCCCCCC=CC([O-])=O ZBYSZWDYDUIDAZ-UHFFFAOYSA-M 0.000 claims description 3
- 239000002344 surface layer Substances 0.000 claims description 3
- 229910001415 sodium ion Inorganic materials 0.000 claims description 2
- 238000007781 pre-processing Methods 0.000 claims 1
- 238000000527 sonication Methods 0.000 claims 1
- 235000012216 bentonite Nutrition 0.000 description 24
- 230000004048 modification Effects 0.000 description 14
- 238000012986 modification Methods 0.000 description 14
- 229910000281 calcium bentonite Inorganic materials 0.000 description 9
- 235000017550 sodium carbonate Nutrition 0.000 description 8
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 7
- 235000010755 mineral Nutrition 0.000 description 6
- 229910052901 montmorillonite Inorganic materials 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 238000005341 cation exchange Methods 0.000 description 4
- 150000001768 cations Chemical class 0.000 description 4
- BCKXLBQYZLBQEK-KVVVOXFISA-M Sodium oleate Chemical compound [Na+].CCCCCCCC\C=C/CCCCCCCC([O-])=O BCKXLBQYZLBQEK-KVVVOXFISA-M 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000004094 surface-active agent Substances 0.000 description 3
- 238000002835 absorbance Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000012736 aqueous medium Substances 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000002114 nanocomposite Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- ZFXVRMSLJDYJCH-UHFFFAOYSA-N calcium magnesium Chemical compound [Mg].[Ca] ZFXVRMSLJDYJCH-UHFFFAOYSA-N 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 229910052615 phyllosilicate Inorganic materials 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000009490 roller compaction Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- -1 sodium modified bentonite Chemical class 0.000 description 1
- 229910000144 sodium(I) superoxide Inorganic materials 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- 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
- C01B33/36—Silicates having base-exchange properties but not having molecular sieve properties
- C01B33/38—Layered base-exchange silicates, e.g. clays, micas or alkali metal silicates of kenyaite or magadiite type
- C01B33/40—Clays
Abstract
The invention discloses a preparation method of sodium bentonite, which comprises the following steps: pretreating calcium-based bentonite raw soil to obtain fine crushed raw soil; mixing the finely-crushed raw soil with a membrane sodium removal agent to obtain a slurry mixed material; extruding and mixing the mixed materials in an ultrasonic environment to obtain a semi-finished product; and drying and pulverizing the semi-finished product to obtain the sodium bentonite. The sodium treatment time of the sodium bentonite prepared by the method is greatly shortened from about 24 hours of the existing method to about 30 minutes, and the sodium treatment degree is doubled compared with that of the existing method.
Description
Technical Field
The invention relates to the field of nano composite material preparation, and particularly relates to sodium bentonite, a preparation method thereof and an ultrasonic roller rolling machine.
Background
The bentonite mainly comprises montmorillonite which is a 2: 1 layered phyllosilicate mineral composed of two (Si-O) tetrahedral layers and an Al- (O, OH) octahedral layer sandwiched between the two (Si-O) tetrahedral layers, and the interlayer cations of the bentonite have low energy required for desorption and adsorption and can be widely replaced by other cations.
The interlayer cations of the montmorillonite are replaced by other cations to prepare various clay nanocomposites, so the montmorillonite used as the raw material must have better Cation Exchange Capacity (CEC). Among the various types of montmorillonite currently known, sodium-based montmorillonite has a relatively good CEC. The sodium bentonite has the advantages of high water absorption, large expansion capacity, large cation exchange capacity, good dispersibility in an aqueous medium, large colloid value, thixotropy of colloid suspension, good viscosity and lubricity, high pH value, good thermal stability and the like.
Since clay has a greater adsorption capacity for Ca2+ than for Na +, most bentonites in nature are calcium-based bentonites. Therefore, it is necessary to modify calcium-magnesium montmorillonite into sodium montmorillonite by ion exchange. There are many ways to realize the bentonite sodification reaction, and currently known artificial sodification ways include a suspension method, an extrusion sodification method, a storage yard sodification method, an extrusion sodification method and the like.
There are major problems
(1) The mineral powder is coagulated in a water-based system to reduce the sodium treatment efficiency
The sodium modification of calcium bentonite is a salt-base exchange reaction and can be carried out in the presence of water. Under normal conditions, the reaction is not easy to be completed. In order to improve the sodium treatment efficiency of calcium bentonite, extrusion method is often used for grinding and powdering. However, the superfine powder formed by rolling has small particle size, large specific surface area and surface energy, and is easy to agglomerate in water, and the powder suspended in the solution is easy to agglomerate due to van der waals force. The agglomeration effect reduces the contact area of the calcium bentonite and Na +, and reduces the sodium modification speed of the calcium bentonite to a certain extent.
(2) The presence of the water barrier film leads to incomplete internal sodium modification
Calcium bentonite is a water-insoluble flaky crystalline form which can only be suspended in water in the form of a conglomerate aggregate, and the reaction of calcium bentonite with sodium carbonate only proceeds on the surface of the particles. The sodium-modified surface layer forms a water-resisting film due to hydration, and wraps the calcium soil which is not subjected to sodium modification in the particles, and if the sodium-modified film cannot be stripped in time, the sodium modification of the inner layer can be affected, so that the phenomenon of 'entrainment' and the existence of a large amount of unreacted free sodium carbonate are caused.
Disclosure of Invention
Objects of the invention
The invention aims to provide sodium bentonite, a preparation method thereof and an ultrasonic roller-pair rolling machine to solve the problems.
(II) technical scheme
In order to solve the above problems, a first aspect of the present invention provides a method for preparing sodium bentonite, comprising: pretreating calcium-based bentonite raw soil to obtain fine crushed raw soil; mixing the finely-crushed raw soil with a membrane sodium removal agent to obtain a slurry mixed material; extruding and mixing the mixed material in an ultrasonic environment for a preset time to obtain a semi-finished product; and (3) pulverizing the semi-finished product to obtain the sodium bentonite.
Further, the pretreatment is as follows: and crushing the calcium-based bentonite raw soil, and then sieving.
Further, the particle size of the fine raw soil is less than 4 mm.
Further, the film removing sodium treatment agent comprises: the mineral powder surface water-resisting membrane is formed by two or more of sodium carbonate powder, sodium pyrophosphate, sodium polyphosphate and sodium octadecenoate, wherein the sodium carbonate powder is used for providing Na + ions for sodium modification of calcium bentonite, and the rest chemical components eliminate a mineral powder surface water-resisting membrane under the action of a surfactant.
Furthermore, the ultrasonic generator belongs to a piezoelectric ultrasonic generator, and utilizes the resonance of piezoelectric crystals to generate ultrasonic waves, so that relative motion is generated between particles of the bentonite mineral powder aggregate and between layers to disperse, the contact area of calcium bentonite and Na + is increased, and the exchange speed of Ca2+ and Na + is increased.
Further, the ultrasonic environment is a mechanical wave environment with frequency greater than 20 kHz.
Further, the predetermined time is 30 min.
Further, the pulverization treatment is as follows: and sequentially drying and crushing the semi-finished product.
According to another aspect of the invention, the invention provides sodium bentonite prepared by applying the preparation method of the sodium bentonite in any one of the schemes.
According to another aspect of the invention, an ultrasonic double-roller rolling machine is provided, which is used for preparing the sodium bentonite according to the scheme by using the preparation method of the sodium bentonite according to any one of the schemes.
Further, an ultrasonic emitter is arranged at the lower part of the roller of the roll-to-roll machine.
(III) advantageous effects
The technical scheme of the invention has the following beneficial technical effects:
(1) the use of underwater ultrasonic waves can greatly shorten the sodium treatment time. The traditional process generally needs 24 hours, while the method only needs 30 min;
(2) the inorganic surfactant sodium pyrophosphate, sodium polyphosphate and organic surfactant sodium oleate are mixed with the soda ash to form a film removing sodiumizing agent, so that a water-resisting film on the surface layer of the bentonite mineral powder can be greatly removed, and the degree of sodiumization can be obviously improved by 1-2 times compared with the conventional method.
Drawings
Fig. 1 is a flow chart of a method for preparing sodium bentonite according to a first embodiment of the present invention;
FIG. 2 is a flow chart of a sodium bentonite semi-finished product according to an alternative embodiment of the invention;
FIG. 3 is a partial schematic view of a piezoelectric sonotrode according to an alternative embodiment of the invention.
Reference numerals
1: a calcium bentonite fine raw soil feeding hole; 2: a film removing sodium chemical agent solution tank; 3: a liquid flow meter; 4: a slurry mixing barrel; 5: a double-roller machine; 6: an ultrasonic generator; 7: discharging the semi-finished product; 61: a resonance disk; 62: a piezoelectric wafer; 63: and a lead terminal.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Fig. 1 is a flow chart of a method for preparing sodium bentonite according to a first embodiment of the present invention.
As shown in fig. 1, in a first embodiment of the present invention, there is provided a method for preparing sodium bentonite, comprising:
s1: pretreating calcium-based bentonite raw soil to obtain fine crushed raw soil;
optionally, the pretreatment is: the calcium-based bentonite raw soil is subjected to coarse crushing, sieving and fine crushing in sequence. Alternatively, the finely-divided treatment may be carried out by crushing with a crusher. Specifically, the crusher is also a jaw crusher, a reaction crusher, an impact crusher, a ring hammer crusher, a cone crusher, or the like. Preferably, a jaw crusher is adopted, and the jaw crusher has low noise and less dust; the crushing ratio is large, and the product granularity is uniform; the structure is simple, the work is reliable, and the operation cost is low; the lubricating system is safe and reliable, the replacement of parts is convenient, and the maintenance of equipment is simple; the crushing cavity is deep and has no dead zone, so that the feeding capacity and the yield are improved; energy conservation of equipment: the energy of the single machine is saved by 15-30%, and the energy of the system is saved by more than one time; the adjusting range of the discharge opening is large, and the requirements of different users can be met. Preferably, the screen mesh used in the screening step is a 5-mesh screen. Optionally, the particle size of the finely divided raw soil is less than 4 mm.
S2: mixing the finely ground raw soil and a film sodium removal agent to obtain a slurry mixed material;
optionally, the film removing sodium agent comprises: sodium carbonate powder, sodium pyrophosphate (chemical formula is Na)4P2O7) Sodium polyphosphate and sodium octadecenoate (chemical formula C)18H33NaO2) Two or more of them. Preferred phosphates P2O5The content is more than or equal to 60.0 percent. Preferably, the soda ash accounts for 1-4% of the whole slurry mixed material, and the particle size of soda ash powder is less than 10 meshes; 1-3% of the whole slurry mixture of sodium pyrophosphate; 1-3% of the whole slurry mixture of sodium polyphosphate; 1-3% of the whole slurry mixture of sodium oleate. In this range, the sodium treatment time is short and the sodium treatment degree is doubled as compared with the conventional method.
S3: extruding and mixing the mixed materials in an ultrasonic environment to obtain a semi-finished product;
optionally, the ultrasonic environment is a mechanical wave environment with a frequency greater than 20 kHz. Optionally, the predetermined time is 30 min.
S4: and carrying out pulverization treatment on the semi-finished product to obtain the sodium bentonite.
Optionally, the pulverization treatment is: and (4) drying and crushing the semi-finished product in sequence. Optionally, the raw materials are dried in a natural environment, or dried by a dryer and then crushed by a crusher.
The sodium bentonite prepared by the method has the advantages of short sodium modification time and high preparation efficiency, and the sodium modification degree is one time of that of the sodium bentonite prepared by the existing method.
Example 1
Six groups of experimental data of bentonite absorbance, CEC and a group of blank control group data under the conditions of different ultrasonic wave powers and ultrasonic wave environment time are selected in the experiment, and are specifically shown in Table 1.
TABLE 1 ultrasonic double-roller compaction sodium modification experiment
Experiments show that: the absorbance is maximum when the ultrasonic power is 600W and the ultrasonic time is 30 min. Therefore, the ore pulp has the largest number of powder particles, the best dispersion effect, the highest Cation Exchange Capacity (CEC) value and the best sodium modification effect. The Cation Exchange Capacity (CEC) of the sodium modified bentonite in an aqueous medium with the pH value of 7 can be 1.0-1.4mmol/g generally by the conventional method, while the CEC value of the bentonite can be increased to 2.79mmol/g by the method and the device of the patent, and the consumed time is short, so that the efficiency and the efficiency are both due to the traditional method.
Example 2
In the test, under the preset conditions that the ultrasonic power is 600W and the ultrasonic time is 30min, CEC values of the scleral bentonite, Guangxi bentonite and Jiangsu bentonite are detected by selecting different sodiumizing agents, and specific results are shown in Table 2.
TABLE 2 Effect of different types of sodidizing agents on the CEC value of Bentonite
Experiments show that the sodium treatment agent formula (Na) is used under the preset conditions that the ultrasonic power is 600W and the ultrasonic time is 30min2CO3Sodium pyrophosphate, sodium polyphosphate and sodium oleate) and the CEC value of the bentonite in the productive area can be further increased to about 3.0mmol/g, which shows that the traditional Na is used2CO3A single component sodiuzing agent.
In another aspect of the embodiments of the present invention, there is provided a sodium bentonite prepared by applying the method for preparing a sodium bentonite according to any one of the embodiments.
FIG. 2 is a schematic structural view of an ultrasonic counter-roll mill according to an alternative embodiment of the present invention;
fig. 3 is a partial schematic view of an ultrasonic counter-roll mill according to an alternative embodiment of the invention.
As shown in fig. 2 and 3, in still another aspect of the embodiment of the present invention, there is provided an ultrasonic roll mill for preparing the sodium bentonite of the above embodiment by using the method for preparing sodium bentonite of any one of the above embodiments. The film removing sodiumizing agent in the sodiumizing agent solution tank 2 is mixed with the fine raw soil of the calcium-based bentonite fine raw soil feeding port 1 in the slurry mixing barrel 4 through a pipeline to form a slurry mixed material, the slurry mixed material is further mixed through the combined action of a pair roller gear of a pair roller press 5 and an ultrasonic emitter 6 to obtain a semi-finished product of sodium-based bentonite, and the semi-finished product of sodium-based bentonite is output at a semi-finished product discharging port 7. A liquid flow meter 3 is arranged on the pipeline of the film removing sodium agent and is used for recording the adding amount of the film removing sodium agent
Optionally, an ultrasonic emitter 6 is arranged at the lower part of the roller of the roll-to-roll machine 5. As shown in fig. 3, the ultrasonic transmitter 6 includes: a resonator disc 61, a piezoelectric wafer 62 and lead terminals 63.
Example 3
TABLE 3 influence of different mounting positions of ultrasonic waves on the dispersion effect of bentonite slurry
Experiments show that under the preset conditions that the ultrasonic power is 600W and the ultrasonic time is 30min, the ultrasonic generator is arranged at the lower part of the pair rollers, and the dispersion effect on the bentonite slurry is optimal.
The invention aims to protect a preparation method of sodium bentonite, which comprises the following steps: pretreating calcium-based bentonite raw soil to obtain fine crushed raw soil; mixing the finely-crushed raw soil with a membrane sodium removal agent to obtain a mixed material; extruding and mixing the mixed materials in an ultrasonic environment to obtain a semi-finished product; and carrying out pulverization treatment on the semi-finished product to obtain the sodium bentonite. The sodium bentonite prepared by the method has the advantages of short sodium modification time and high preparation efficiency, and the sodium modification degree is one time of that of the sodium bentonite prepared by the existing method.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (10)
1. A preparation method of sodium bentonite is characterized by comprising the following steps:
pretreating calcium-based bentonite raw soil to obtain fine crushed raw soil;
mixing the finely-crushed raw soil with a membrane sodium removal agent to obtain a slurry mixed material;
extruding and mixing the slurry mixed material in an ultrasonic environment to obtain a semi-finished product;
and drying and pulverizing the semi-finished product to obtain the sodium bentonite.
2. The method of claim 1, wherein the pre-processing is: and crushing the calcium-based bentonite raw soil, and then sieving.
3. The method of claim 1, wherein the finely divided raw soil has a particle size of less than 4 mm.
4. The method according to claim 1, wherein the film removing sodium agent has the effects of providing Na + ions and removing a water-resisting film on the surface layer of the mineral powder, and specifically comprises the following steps: two or more of sodium carbonate powder, sodium pyrophosphate, sodium polyphosphate and sodium octadecenoate.
5. The method of claim 1, wherein the extrusion mixing is for a time of 20-50 min.
6. The method according to claim 1, wherein the ultrasonic environment is a mechanical wave environment with a frequency of more than 20kHz and the sonication time is 20-50 min.
7. The method according to claim 1, characterized in that the pulverization treatment is: and sequentially drying and crushing the semi-finished product.
8. A sodium bentonite, which is prepared by the preparation method of the sodium bentonite according to any one of claims 1 to 7.
9. An ultrasonic double-roll roller mill, characterized in that it is used for preparing the sodium bentonite according to claim 8.
10. The counter roller mill according to claim 9, characterized in that an ultrasonic emitter (6) is provided under the roller of the counter roller (5).
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