CN111346594A - Preparation method of magnesium oxide nano particle cluster for adsorbing heavy metal - Google Patents
Preparation method of magnesium oxide nano particle cluster for adsorbing heavy metal Download PDFInfo
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- CN111346594A CN111346594A CN201811580906.XA CN201811580906A CN111346594A CN 111346594 A CN111346594 A CN 111346594A CN 201811580906 A CN201811580906 A CN 201811580906A CN 111346594 A CN111346594 A CN 111346594A
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- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 239000000395 magnesium oxide Substances 0.000 title claims abstract description 43
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 40
- 239000002105 nanoparticle Substances 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 44
- YIXJRHPUWRPCBB-UHFFFAOYSA-N magnesium nitrate Chemical compound [Mg+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O YIXJRHPUWRPCBB-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000003756 stirring Methods 0.000 claims abstract description 27
- 238000001179 sorption measurement Methods 0.000 claims abstract description 26
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims abstract description 16
- 235000011114 ammonium hydroxide Nutrition 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 239000012467 final product Substances 0.000 claims abstract description 4
- 239000002904 solvent Substances 0.000 claims abstract description 4
- 238000005303 weighing Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 27
- 239000002202 Polyethylene glycol Substances 0.000 claims description 8
- 229920001223 polyethylene glycol Polymers 0.000 claims description 8
- 238000001354 calcination Methods 0.000 claims description 7
- 239000008367 deionised water Substances 0.000 claims description 7
- 229910021641 deionized water Inorganic materials 0.000 claims description 7
- 238000001027 hydrothermal synthesis Methods 0.000 claims description 7
- 230000035484 reaction time Effects 0.000 claims description 2
- 239000007864 aqueous solution Substances 0.000 claims 1
- 239000000243 solution Substances 0.000 claims 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 abstract description 10
- 229910052759 nickel Inorganic materials 0.000 abstract description 5
- 239000002351 wastewater Substances 0.000 abstract description 5
- 238000005342 ion exchange Methods 0.000 abstract description 4
- 150000002500 ions Chemical class 0.000 abstract description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 abstract description 3
- 229910052793 cadmium Inorganic materials 0.000 abstract description 3
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052802 copper Inorganic materials 0.000 abstract description 3
- 239000010949 copper Substances 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 abstract description 3
- 238000004064 recycling Methods 0.000 abstract description 3
- 229910052725 zinc Inorganic materials 0.000 abstract description 3
- 239000011701 zinc Substances 0.000 abstract description 3
- 238000009713 electroplating Methods 0.000 abstract description 2
- 239000002923 metal particle Substances 0.000 abstract description 2
- 230000008929 regeneration Effects 0.000 abstract description 2
- 238000011069 regeneration method Methods 0.000 abstract description 2
- 229920006395 saturated elastomer Polymers 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 8
- 239000007787 solid Substances 0.000 description 8
- 238000001035 drying Methods 0.000 description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 238000003917 TEM image Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000003786 synthesis reaction Methods 0.000 description 3
- VEQPNABPJHWNSG-UHFFFAOYSA-N Nickel(2+) Chemical compound [Ni+2] VEQPNABPJHWNSG-UHFFFAOYSA-N 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000005189 flocculation Methods 0.000 description 2
- 230000016615 flocculation Effects 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 229910001453 nickel ion Inorganic materials 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000002306 biochemical method Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000000975 co-precipitation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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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
- B01J20/04—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium
- B01J20/041—Oxides or hydroxides
-
- 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
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
- B01J20/28057—Surface area, e.g. B.E.T specific surface area
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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
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/3078—Thermal treatment, e.g. calcining or pyrolizing
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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- Water Supply & Treatment (AREA)
- Environmental & Geological Engineering (AREA)
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- Life Sciences & Earth Sciences (AREA)
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Abstract
The invention discloses a preparation method of magnesium oxide nano particle groups for adsorbing heavy metals, which relates to the field of heavy metal water body treatment and heavy metal resource enrichment recycling, and comprises the steps of weighing magnesium nitrate, dissolving the magnesium nitrate in a solvent, and fully stirring to obtain a material A; slowly adding ammonia water into the solution A under the stirring condition to obtain a material B; and carrying out heat treatment on the material B to obtain a final product magnesium oxide nano particle group. The magnesium oxide nano particle cluster prepared by the embodiment of the invention has larger specific surface area; the magnesium oxide nano particle cluster prepared by the embodiment of the invention can be used for removing heavy metal particles such as zinc, nickel, copper, cadmium, lead and the like in electroplating wastewater by the principle of ion adsorption or partial ion exchange, and the adsorption capacity of typical heavy metal nickel and lead can reach 1500mg/g or more; the magnesium oxide nano particle clusters prepared by the embodiment of the invention can be further used for adsorbing heavy metals for recovery and regeneration after being adsorbed and saturated, so that secondary pollution is avoided, and the economic benefit is maximized.
Description
Technical Field
The invention relates to the field of heavy metal water body treatment and heavy metal resource enrichment recycling, in particular to a preparation method of magnesium oxide nano particle clusters for adsorbing heavy metals.
Background
With the rapid growth of economy in China, the ecological environment is increasingly worsened, and heavy metal water pollution becomes a serious environmental problem. The heavy metal pollution treatment method mainly comprises three types: the first is the removal of heavy metal ions by chemical reactions, such as neutralization precipitation, sulfide precipitation, ferrite coprecipitation, chemical and electrochemical reduction, and high-molecular heavy metal capture; the second method is that the chemical form of heavy metal is not changed, and the heavy metal is removed by physical methods such as adsorption, extraction, evaporation and solidification, ion exchange, membrane separation and the like; the third category is to remove heavy metals in the wastewater by means of flocculation, selective absorption, enrichment and the like of microorganisms or plants, and specifically comprises biological flocculation, biochemical methods, plant ecological restoration and the like.
At present, the traditional precipitation method is difficult to meet the treatment and discharge requirements from the aspect of water quality, a large amount of solid waste residues are inevitably generated in the treatment process, the essence of the method is pollution transfer, and the recovery and utilization of heavy metal resources are difficult to really achieve. Emerging biological treatment is still in a test stage, and practical application is limited. The existing methods such as ion adsorption, ion exchange, membrane separation and the like have higher heavy metal removal capacity than the traditional precipitation method, and can realize secondary recycling of partial heavy metals, but the existing methods have higher treatment cost and certain difficulty in large-scale application. In recent years, heavy metal adsorbing materials are widely concerned, particularly, nanometer adsorbing materials including iron oxide have strong adsorption capacity which can reach 50-400mg/g, and the iron oxide has magnetism, is convenient to collect after adsorption and avoids nanometer pollution to a certain extent.
Magnesium oxide is another highly appreciated heavy metal adsorption material, and the main reason is that magnesium oxide is non-toxic and harmless and has good heavy metal adsorption capacity. The magnesium oxide surface has a large amount of negative charges, the heavy metal adsorption capacity of the traditionally synthesized nano-scale or submicron-scale magnesium oxide can easily break through 200mg/g, the adsorption capacity of the magnesium oxide adsorbent synthesized in a laboratory with high specific surface area can exceed 1000mg/g, and the conclusion that the adsorption capacity of the magnesium oxide has a great relationship with the specific surface area can be obtained. However, at present, the synthesis process of the nano magnesium oxide with high specific surface area is complex, part of the synthesis process needs special equipment, and the production cost is still high. In addition, the specific surface area of the existing nano-magnesia is 50m2About/g, high energy up to 80m2Per g, but the large-scale synthesis of nano-sized magnesium oxide rarely reaches 100m2/g。
Therefore, those skilled in the art have endeavored to develop a high specific surface area (about 100 m) which is simple in preparation and low in production cost2The preparation method of the magnesium oxide nano particle group is convenient for popularization.
Disclosure of Invention
In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide a method for preparing magnesium oxide nanoparticle clusters for adsorbing heavy metals, such that the preparation process is simple and easy to popularize compared with the prior art, and the prepared magnesium oxide nanoparticle clusters have a larger surface area and a larger adsorption capacity.
In order to achieve the above object, the present invention provides a method for preparing magnesium oxide nanoparticle clusters for adsorbing heavy metals, comprising:
s100, weighing magnesium nitrate, dissolving the magnesium nitrate in a solvent and fully stirring to obtain a material A;
s200, slowly adding ammonia water into the solution A under the stirring condition to obtain a material B;
s300, carrying out heat treatment on the material B to obtain a final product magnesium oxide nano particle group.
Compared with the prior art, the invention has the advantages that:
(1) the embodiment of the invention has simple implementation mode, lower production cost and convenient popularization;
(2) the magnesium oxide nano particle cluster prepared by the embodiment of the invention has higher specific surface area which can reach about 100m2/g；
(3) The magnesium oxide nano particle cluster prepared by the embodiment of the invention can be used for removing heavy metal particles such as zinc, nickel, copper, cadmium, lead and the like in electroplating wastewater by the principle of ion adsorption or partial ion exchange, and the adsorption capacity of typical heavy metal nickel and lead can reach 1500mg/g or more;
(4) the magnesium oxide nano particle clusters prepared by the embodiment of the invention can be further used for adsorbing heavy metals for recovery and regeneration after being adsorbed and saturated, so that secondary pollution is avoided, and the economic benefit is maximized.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 is a flow chart illustrating the preparation of a preferred embodiment of the present invention;
FIGS. 2A to 2B are transmission electron micrographs of magnesium oxide nanoparticle clusters prepared in the example of the present invention at 200nm and 20nm dimensions.
Detailed Description
The technical contents of the preferred embodiments of the present invention will be more clearly and easily understood by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.
As shown in fig. 1, a flow chart of a preferred embodiment of the present invention, the steps of preparing the magnesium oxide nanoparticle clusters include:
s100, weighing 500-600g of magnesium nitrate, dissolving the magnesium nitrate in deionized water or polyethylene glycol, and fully stirring at the speed of 200r/min to obtain a material A, wherein the stirring time is controlled to be 30-60 mins;
s200, slowly adding 5-7% ammonia water into the solution A at a stirring speed of 200r/min at a speed of 45-55ml/min to obtain a material B;
s300, calcining the material B at the temperature of 500-600 ℃ for 2-3 hours to obtain a final product, namely the magnesium oxide nano particle cluster, and performing hydrothermal reaction on the material B before performing heat treatment on the material B, wherein the temperature of the hydrothermal reaction is 120-140 ℃ and the reaction time is 4-5 hours.
The following 5 examples illustrate specific embodiments of the invention
Example 1
(1) Dissolving 500g of magnesium nitrate in 2L of deionized water, and fully stirring for 30mins at the rotating speed of 200r/min to obtain a material A;
(2) after uniformly stirring, slowly adding 1L of 5% diluted ammonia water into the material A at the speed of 45ml/min, and keeping the stirring speed at 200r/min in the ammonia water adding process to obtain a material B;
(3) and drying the material B, calcining the material B in an air atmosphere at 500 ℃ for 2 hours to obtain a white block, namely high-purity magnesium oxide, and crushing the white block to be directly used for adsorbing heavy metals.
Example 2
(1) Dissolving 520g of magnesium nitrate in 2L of deionized water, and fully stirring for 35mins at the rotating speed of 200r/min to obtain a material A;
(2) after stirring uniformly, slowly adding 1L of 5.5% ammonia water into the material A at the speed of 50ml/min, and keeping the stirring speed at 200r/min in the ammonia water adding process to obtain a material B;
(3) and (3) drying the material B, transferring the material B to a reaction kettle, setting the temperature at 120 ℃ for reaction for 4 hours to obtain white colloidal solid, calcining the solid in an air atmosphere at 550 ℃ for 2 hours to obtain a white block, namely high-purity magnesium oxide, and crushing the white block to be directly used for adsorbing heavy metals.
Example 3
(1) Dissolving 550g of magnesium nitrate and 40g of polyethylene glycol in 2L of deionized water, and fully stirring at the rotating speed of 200r/min for 40mins to obtain a material A;
(2) after uniformly stirring, slowly adding 1L of 6% ammonia water into the material A at the speed of 50ml/min, and keeping the stirring speed at 200r/min in the ammonia water adding process to obtain a material B;
(3) and (3) drying the material B, transferring the material B to a reaction kettle, setting the temperature at 130 ℃ for reaction for 4.5 hours to obtain white colloidal solid, calcining the solid in an air atmosphere at 550 ℃ for 2 hours to obtain a white block, namely high-purity magnesium oxide, and crushing the white block to be directly used for adsorbing heavy metals.
Example 4
(1) Dissolving 550g of magnesium nitrate and 80g of polyethylene glycol in 2L of deionized water, and fully stirring for 45mins at the rotating speed of 200r/min to obtain a material A;
(2) after stirring uniformly, slowly adding 1L of 6.5% ammonia water into the material A at the speed of 50ml/min, and keeping the stirring speed at 200r/min in the ammonia water adding process to obtain a material B;
(3) and (3) drying the material B, transferring the material B to a reaction kettle, setting the temperature at 130 ℃ for reaction for 4.5 hours to obtain white colloidal solid, calcining the solid in an air atmosphere at 550 ℃ for 2 hours to obtain a white block, namely high-purity magnesium oxide, and crushing the white block to be directly used for adsorbing heavy metals.
Example 5
(1) Dissolving 600g of magnesium nitrate and 160g of polyethylene glycol in 2L of deionized water, and fully stirring for 60mins at the rotating speed of 200r/min to obtain a material A;
(2) after uniformly stirring, slowly adding 1L of 7% ammonia water into the material A at a speed of 55ml/min, and keeping the stirring speed at 200r/min in the ammonia water adding process to obtain a material B;
(3) and (3) drying the material B, transferring the material B to a reaction kettle, setting the temperature to react for 5 hours at 140 ℃ to obtain white colloidal solid, calcining the solid for 2 hours in the air atmosphere of 600 ℃ to obtain a white block, namely high-purity magnesium oxide, and crushing the white block to be directly used for adsorbing heavy metals.
Fig. 2A to 2B are transmission electron micrographs of magnesium oxide nanoparticle clusters prepared according to an embodiment of the present invention, wherein fig. 2A is a transmission electron micrograph at a size of 200nm, and it can be seen that the magnesium oxide nanoparticle clusters have different morphologies; FIG. 2B is a transmission electron microscope image under 20nm, which shows that there are many voids and defects on the surface of the magnesium oxide nanoparticle clusters.
TABLE 1 comparison of the effect of hydrothermal reaction and polyethylene glycol addition on the adsorption capacity of magnesium oxide nanoparticle clusters
In the above table, it can be seen that in example 1, when no polyethylene glycol is added and no hydrothermal reaction is performed, the adsorption amount of nickel ions is the smallest, and accordingly, the specific surface area of the prepared magnesium oxide nanoparticle groups is the smallest, and as the addition amount of polyethylene glycol is increased and the hydrothermal reaction is performed in examples 2 to 5, the specific surface area of the prepared magnesium oxide nanoparticle groups is also increased rapidly, and at the same time, the adsorption amount of nickel ions is increased accordingly.
TABLE 2 adsorption amounts of magnesium oxide nanoparticle groups prepared in example 4 to various heavy metals (1L of heavy metal wastewater was treated with 1.0g of adsorbent in the experiment)
As can be seen from the above table, when the initial heavy metal wastewater of the magnesium oxide nanoparticle clusters prepared in example 4 is 1L, the adsorption amounts of different heavy metals are different, specifically, after adsorbing for 3 hours, the adsorption amount of nickel can reach 1606mg/g, the adsorption amount of zinc can reach 838mg/g, the adsorption amount of cadmium can reach 1505mg/g, the adsorption amount of copper can reach 1321mg/g, and the adsorption efficiency of lead can reach 2001mg/g, where the adsorption amount of lead is the highest.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (9)
1. A method for preparing magnesium oxide nanoparticle agglomerates for heavy metal adsorption, the method comprising:
s100, weighing magnesium nitrate, dissolving the magnesium nitrate in a solvent and fully stirring to obtain a material A;
s200, slowly adding ammonia water into the solution A under the stirring condition to obtain a material B;
s300, carrying out heat treatment on the material B to obtain a final product magnesium oxide nano particle group.
2. The method as claimed in claim 1, wherein the mass of the magnesium nitrate in the step S100 is preferably 500-600 g.
3. The method of claim 1, wherein the solvent in step S100 is one of deionized water or an aqueous solution of polyethylene glycol.
4. The method according to claim 1, wherein the stirring speed in step S100 is 200 r/min.
5. The method according to claim 1, wherein the stirring time in step S100 is 30-60 mins.
6. The method of claim 1, wherein the stirring speed in step S200 is 200r/min, the ammonia water adding speed is controlled to be 45-55ml/min, and the ammonia water concentration is 5-7%.
7. The method as claimed in claim 1, wherein the heat treatment in S300 is calcining the material B at 500-600 ℃ for 2-3 hours.
8. The method of claim 1, wherein the hydrothermal reaction of the material B is performed before the heat treatment in S300.
9. The method as claimed in claim 1, wherein the hydrothermal reaction temperature is 120-140 ℃ and the reaction time is 4-5 h.
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| CN115814752A (en) * | 2023-01-31 | 2023-03-21 | 成都理工大学 | Calcium carbonate and nano-magnesia composite material and preparation and application methods thereof |
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