CN105271319A - Method for preparing nanometer MgO - Google Patents
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- CN105271319A CN105271319A CN201510710486.2A CN201510710486A CN105271319A CN 105271319 A CN105271319 A CN 105271319A CN 201510710486 A CN201510710486 A CN 201510710486A CN 105271319 A CN105271319 A CN 105271319A
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Abstract
The invention provides a method for preparing nanometer MgO, and belongs to the technical field of material preparation. The method sequentially comprises the following steps: A, preparation of organic emulsion; B, preparation of a compound; C, roasting of the compound. According to the method for preparing the nanometer MgO provided by the invention, through the steps of the preparation of the organic emulsion, the preparation of the compound and the roasting of the compound, compared with a current preparation method, the method is simple to operate, the yield and grade of nanometer MgO products are improved, the pollution of waste residues and pollutants to environment due to directly calcining magnesite and dolomite, or using precipitants such as limestone is avoided, and the production cost is reduced.
Description
Technical field
The present invention relates to technical field of material, in particular to a kind of method preparing nano-MgO.
Background technology
China has abundant magnesium resource, is also big producing country and the consumption big country of magnesium salts product.According to pertinent data incomplete statistics, the industrial scale of China's reheating magnesia and consumption are about 2,500,000 tons/year and 1,000,000 tons/year respectively, the industrial scale of caustic-calcined magnesite and consumption are about 1,000,000 tons/year and 600,000 tons/year respectively, and the industrial scale of fire-resistant level magnesia and consumption are about 1,500,000 tons/year and 1,400,000 tons/year respectively.These common magnesia mainly come from calcined magnesite, and highly-purity magnesite breach is huge.Pertinent data shows, domestic high-purity MgO market demand about 100,000 tons/year, and output about 1.0 ten thousand tons/year; The price of light MgO 0.7 ~ 0.8 ten thousand yuan/ton, pharmaceutical grade MgO is up to 3.8 ten thousand yuan/ton.Within 2013, customs's data presentation imported and exported by China's magnesium salts, the MgO export volume 84.6 ten thousand tons that magnesite calcining is produced and beautiful yuan/ton of outlet average price 150, and import volume about 0.4 ten thousand tons and beautiful yuan/ton of import price 1190; Synthesis method MgO export volume 573 tons and beautiful yuan/ton of outlet average price 3310, and import volume 7135 tons and beautiful yuan/ton of import price 3900.This exposes the drawback of magnesium salts industry long-term existence " first-class resource, second-class processing and third-class price " undoubtedly, it is sacrifice Mineral resources and ecotope to obtain economic worth that magnesium oxide is produced, and the high-purity magnesium oxide of high-performance, high added value and super-refinement depends on import.
And prior art produces MgO mainly through magnesite and dolomite calcination, or utilize magnesium salts and milk of lime to react to generate Mg (OH)
2, then obtain MgO through high-temperature roasting process, but not only there is complex process in it, and cost is high, the problem that the productive rate of magnesium oxide product and grade are all lower, but also can produce a large amount of waste residue and pollutent.
Summary of the invention
In order to solve the problem, the object of the present invention is to provide a kind of method preparing nano-MgO, to improve productive rate and the grade of magnesium oxide product, reduce the discharge of waste residue and pollutent, and relative to existing preparation method, it be simple to operate.
The technical solution adopted in the present invention is:
Prepare a method for nano-MgO, comprise the following steps:
A. organic emulsion preparation: by carbonatoms be 20 ~ 100 long-chain organism and tensio-active agent join in the mixing solutions of distilled water and ethanol and carry out stirring and emulsifying, prepare organic emulsion;
B. the preparation of mixture: in the described organic emulsion that steps A obtains, add sodium carbonate solution and magnesium salt solution simultaneously, and make the pH value of reaction system maintain 5.0 ~ 11.0, then reaction, to completely, obtains suspended emulsion under agitation; Described suspended emulsion after filtration, washing obtain filtrate and filter cake respectively, described filter cake obtains the mixture be made up of magnesium basic carbonate/organism after drying;
C. the roasting of mixture: the described mixture obtained by step B obtains nano magnesia and CO after calcination process
2gas.
The above-mentioned method preparing nano-MgO, it comprises organic emulsion preparation process, the preparation process of mixture and calcination steps, make it relative to existing preparation method, simple to operate, improve productive rate and the grade of nano-MgO product, and avoid because of dinectly bruning magnesite and rhombspar, or the use of the precipitation agent such as Wingdale and cause waste residue and pollutent to the pollution of environment, reduce production cost.
Further, the mass ratio of described long-chain organism and described tensio-active agent is 100:5 ~ 30; Described distilled water in described mixing solutions and the volume ratio of described ethanol are 100:1 ~ 50.
Preferably, the mass ratio of described long-chain organism and described tensio-active agent is 100:20; Described distilled water in described mixing solutions and the volume ratio of described ethanol are 100:25.
Further, described long-chain organism is selected from paraffin, stearic acid, sodium stearate, Magnesium Stearate, paraffin crystallite and polyoxyethylene glycol; Described tensio-active agent selects polyoxyethylene sorbitan monooleate, glycerol, cetyl trimethylammonium bromide, sodium lauryl sulphate, Sodium dodecylbenzene sulfonate and polyvinylpyrrolidone.
Further, step C comprises vent gas treatment step: by the described CO obtained
2gas passes in NaOH solution, is prepared into sodium carbonate solution needed for step B after absorbing, and returns step B and recycle.
More friendly to environment in order to be this preparation method, preferably, step C comprises vent gas treatment step, CO roasting produced by vent gas treatment step
2gas is passed in NaOH solution, makes CO
2gas and NaOH solution are reacted and are produced sodium carbonate solution, thus avoid CO
2gas purging; Meanwhile, sodium carbonate solution can also return the preparation for mixture in step B, thus is conducive to the recycling of resource.
Further, the described sodium carbonate solution in step B is equal with the volume of described magnesium salt solution, and concentration ratio is 0.5 ~ 2.5:1; The amount concentration of described sodium carbonate solution is 0.1 ~ 1.0mol/L.
Preferably, the described sodium carbonate solution in step B and the concentration ratio of described magnesium salt solution are 1:1; The amount concentration of described sodium carbonate solution is 0.5mol/L.
Further, the magnesium salt solution described in step B is MgCl
2solution; Step B comprises filtrate treatment step: concentrated by described filtrate carrying out, obtain technical grade NaCl after drying treatment.
Step B is by selecting MgCl
2solution is as magnesium salt solution; the filtrate obtained after such reacting liquid filtering is NaCl solution; by filtrate treatment step, filtrate carrying out is concentrated simultaneously, dry; thus obtain technical grade NaCl; therefore, not only avoid filtrate discharge and advantageously in environment protection, simultaneously; also prepare technical grade NaCl, improve the added value of the method preparing nano-MgO.
In above-mentioned preparation method, the emulsifying temperature of steps A is 55 ~ 90 DEG C, and emulsification stirring speed is 2000 ~ 10000r/min; The maturing temperature of step C can be 600 ~ 1100 DEG C.And, in preparation process, the shape of the crystal grain of nano-MgO can be controlled by the adjustment to the parameter of reaction conditions in reactions steps.
Further, the emulsifying temperature of steps A is 25 ~ 90 DEG C, and emulsification stirring speed is 2000 ~ 10000r/min; The maturing temperature of step C is 600 ~ 750 DEG C, and the grain shape of described nano-MgO is flower-shaped.
Further, the emulsifying temperature of steps A is 25 ~ 90 DEG C, and emulsification stirring speed is 2000 ~ 10000r/min; The maturing temperature of step C is 750 ~ 1100 DEG C, and the grain shape of described nano-MgO is hexagonal plate.
Further, the emulsifying temperature of steps A is 25 ~ 90 DEG C, and emulsification stirring speed is 2000 ~ 10000r/min; Described magnesium salts in step B is magnesium sulfate; The maturing temperature of step C is the grain shape of 700 ~ 950 DEG C of described nano-MgOs is bar-shaped.
Under the condition that other conditions are constant, by changing the parameter of reaction conditions, thus the nano-MgO of diverse microcosmic structure and morphology can be obtained.
Further, the magnesium salts in the described magnesium salt solution in step B is carried by salt lake the magnesium resource that potassium industrial by-product gives up in halogen and is obtained.
Above-mentioned magnesium salt solution can use to be carried by lake the magnesium resource that potassium industrial by-product gives up in halogen and obtains magnesium salts, therefore, resource is fully used, avoids the wasting of resources.
Beneficial effect of the present invention:
The method preparing nano-MgO provided by the present invention, by the preparation process of organic emulsion preparation process, mixture and the calcination steps of mixture, make it relative to existing preparation method, simple to operate, improve productive rate and the grade of nano-MgO product, and avoid because of dinectly bruning magnesite and rhombspar, or the use of the precipitation agent such as Wingdale and cause waste residue and pollutent to the pollution of environment, reduce production cost.
Accompanying drawing explanation
Fig. 1 is the schema preparing the method for nano-MgO in embodiment.
Embodiment
Embodiment 1
Present embodiments provide a kind of method preparing nano-MgO, it comprises the following steps:
A. paraffin and tensio-active agent are joined in the mixing solutions of distilled water and ethanol and carry out stirring and emulsifying reaction in 100:5 ~ 30 in mass ratio, its temperature of reaction is 25 ~ 90 DEG C, its stirring velocity is 500 ~ 10000r/min for the speed of mixing, and prepares organic emulsion after emulsion reaction 20 ~ 50min.
B. in the described organic emulsion obtained in steps A, constant speed adds isopyknic sodium carbonate solution and magnesium salt solution simultaneously, the concentration of sodium carbonate solution is 0.1 ~ 1.0mol/L, the concentration ratio of sodium carbonate solution and magnesium salt solution is 0.5:1 ~ 2:1, the pH value of reaction system is made to maintain 5.0 ~ 11.0, then at 45 ~ 85 DEG C, under the agitation condition of 500 ~ 1000r/min, reaction is to completely, obtains suspended emulsion; Described suspended emulsion after filtration, washing obtain filtrate and filter cake respectively, described filter cake obtains the mixture be made up of magnesium basic carbonate/paraffin after drying.
C. the described mixture obtained by step B obtains nano magnesia and CO in 600 ~ 1100 DEG C after calcination process
2gas.
In the present embodiment paraffin can also select other carbonatomss be 20 ~ 100 long-chain organism replace, such as stearic acid, sodium stearate, Magnesium Stearate, paraffin crystallite and polyoxyethylene glycol etc.
Tensio-active agent in the present embodiment selects polyoxyethylene sorbitan monooleate, glycerol, cetyl trimethylammonium bromide, sodium lauryl sulphate, Sodium dodecylbenzene sulfonate and polyvinylpyrrolidone etc.
Magnesium salts in the present embodiment is selected from magnesium chloride and magnesium sulfate etc.
A kind of preferred version as the present embodiment: above-mentioned steps C comprises vent gas treatment step: by the described CO obtained
2gas passes in NaOH solution, is prepared into sodium carbonate solution needed for step B after absorbing, and returns step B and recycle.
Preferably, the magnesium salt solution described in step B is MgCl solution, and step B comprises filtrate treatment step: concentrated by described filtrate carrying out, obtain technical grade NaCl after drying treatment.
The magnesium salt solution described in step B that solution is understood also can adopt other solution, and is prepared into other sodium salt products through filtrate treatment step.
In order to avoid Fe, Al, Ca, B, Li plasma in magnesium salts is on the impact of subsequent reactions, preferably, above-mentioned magnesium salts is the magnesium salts through removal of impurities process, therefore advantageously in the preparation of nano-MgO.
As shown in Figure 1, be the schema of the present embodiment preferred version, first long-chain organism and tensio-active agent joined in the mixing solutions of distilled water and ethanol and carry out emulsion reaction, prepare organic emulsion.
Then join through the magnesium salts of removal of impurities process and sodium carbonate solution in organic emulsion simultaneously, reaction prepares magnesium basic carbonate/paraffin suspended emulsion and carries out filtration treatment, and obtain sodium salt solution and filter cake respectively, and filter cake is repeatedly washed, to remove residual salt.Through concentrated, dry and be prepared into sodium salt product after washings and sodium salt solution merge; Filter cake prepares magnesium basic carbonate/organism mixture after super-dry.
Finally above-mentioned magnesiumcarbonate/organism mixture is carried out roasting and prepares nano-MgO, and produces CO
2gas.Then the CO will produced
2gas is passed in sodium hydroxide solution and carries out absorption process, and the sodium carbonate solution be prepared into needed for step B and returning in step B recycles.
Paraffin in the present embodiment can also select other carbonatomss be 20 ~ 100 long-chain organism replace, such as stearic acid, sodium stearate, Magnesium Stearate, paraffin crystallite and polyoxyethylene glycol etc.
Tensio-active agent in the present embodiment can select the one in polyoxyethylene sorbitan monooleate, glycerol, cetyl trimethylammonium bromide, sodium lauryl sulphate, Sodium dodecylbenzene sulfonate and polyvinylpyrrolidone etc., also can select the compound be made up of two or more tensio-active agents.
Magnesium salts in the present embodiment is selected from magnesium chloride and magnesium sulfate etc.
Embodiment 2
Present embodiments provide a kind of method preparing nano-MgO, it comprises the following steps:
A. compound paraffin and surfactant polyethylene and Trimethyllaurylammonium bromide formed in mass ratio 100:5 ~ 30 joins in the mixing solutions of distilled water and ethanol and carries out stirring and emulsifying reaction, its temperature of reaction is 25 ~ 90 DEG C, its stirring velocity is 500 ~ 10000r/min for the speed of mixing, and prepares organic emulsion after emulsion reaction 20 ~ 50min.
B. in the described organic emulsion obtained in steps A, constant speed adds isopyknic sodium carbonate solution and magnesium salt solution simultaneously, the concentration of sodium carbonate solution is 0.1 ~ 1.0mol/L, the concentration ratio of sodium carbonate solution and magnesium salt solution is 0.5:1 ~ 2:1, the pH value of reaction system is made to maintain 5.0 ~ 11.0, then at 45 ~ 85 DEG C, under the agitation condition of 500 ~ 1000r/min, reaction is to completely, obtains suspended emulsion; Described suspended emulsion after filtration, washing obtain filtrate and filter cake respectively, described filter cake obtains the mixture be made up of magnesium basic carbonate/paraffin after drying; Described filtrate is prepared into technical grade NaCl after concentrated, drying.
C. the described mixture obtained by step B obtains nano magnesia and CO in 600 ~ 750 DEG C after calcination process
2gas; Described CO
2gas passes in NaOH solution, is prepared into sodium carbonate solution needed for step B after absorbing, and returns step B and recycle.
The grain shape of nano-MgO prepared by the present embodiment is flower-shaped, the thick 10 ~ 50nm of its petal, and its particle diameter is 2 ~ 20 μm.
Embodiment 3
Present embodiments provide a kind of method preparing nano-MgO, it comprises the following steps:
A. the compound of paraffin surface promoting agent polyoxyethylene glycol and Trimethyllaurylammonium bromide composition is joined in the mixing solutions of distilled water and ethanol and carries out stirring and emulsifying reaction in 100:5 ~ 30 in mass ratio, its temperature of reaction is 25 ~ 90 DEG C, its stirring velocity is 500 ~ 10000r/min for the speed of mixing, and prepares organic emulsion after emulsion reaction 20 ~ 50min;
B. in the described organic emulsion obtained in steps A, constant speed adds isopyknic sodium carbonate solution and magnesium salt solution simultaneously, the concentration of sodium carbonate solution is 0.1 ~ 1.0mol/L, the concentration ratio of sodium carbonate solution and magnesium salt solution is 0.5:1 ~ 2:1, the pH value of reaction system is made to maintain 5.0 ~ 11.0, then at 45 ~ 85 DEG C, under the agitation condition of 500 ~ 1000r/min, reaction is to completely, obtains suspended emulsion; Described suspended emulsion after filtration, washing obtain filtrate and filter cake respectively, described filter cake obtains the mixture be made up of magnesium basic carbonate/paraffin after drying; Described filtrate is prepared into technical grade NaCl after concentrated, drying.
C. the described mixture obtained by step B obtains nano magnesia and CO in 750 ~ 1100 DEG C after calcination process
2gas; Described CO
2gas passes in NaOH solution, is prepared into sodium carbonate solution needed for step B after absorbing, and returns step B and recycle.
The grain shape of nano-MgO prepared by the present embodiment is hexagonal plate, its particle diameter: 20 ~ 100nm.
Embodiment 4
Present embodiments provide a kind of method preparing nano-MgO, it comprises the following steps:
A. compound paraffin and surfactant sodium dodecyl base benzene sulfonic acid sodium salt and polyvinylpyrrolidone formed in mass ratio 100:5 ~ 30 joins in the mixing solutions of distilled water and ethanol and carries out stirring and emulsifying reaction, its temperature of reaction is 25 ~ 90 DEG C, its stirring velocity is 500 ~ 10000r/min for the speed of mixing, and prepares organic emulsion after emulsion reaction 20 ~ 50min.
B. in the described organic emulsion obtained in steps A, constant speed adds isopyknic sodium carbonate solution and Adlerika simultaneously, the concentration of sodium carbonate solution is 0.1 ~ 1.0mol/L, the concentration ratio of sodium carbonate solution and Adlerika is 0.5:1 ~ 2:1, the pH value of reaction system is made to maintain 5.0 ~ 11.0, then at 45 ~ 85 DEG C, under the agitation condition of 500 ~ 1000r/min, reaction is to completely, obtains suspended emulsion; Described suspended emulsion after filtration, washing obtain filtrate and filter cake respectively, described filter cake obtains the mixture be made up of magnesium basic carbonate/paraffin after drying; Described filtrate is prepared into technical grade NaCl after concentrated, drying.
C. the described mixture obtained by step B obtains nano magnesia and CO in 700 ~ 950 DEG C after calcination process
2gas; Described CO
2gas passes in NaOH solution, is prepared into sodium carbonate solution needed for step B after absorbing, and returns step B and recycle.
The grain shape of nano-MgO prepared by the present embodiment is bar-shaped shape, and long 1 ~ 100 μm of its particle diameter, its diameter is 50nm ~ 10 μm.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. prepare a method for nano-MgO, it is characterized in that, comprise the following steps:
A. organic emulsion preparation: by carbonatoms be 20 ~ 100 long-chain organism and tensio-active agent join in the mixing solutions of distilled water and ethanol and carry out stirring and emulsifying, prepare organic emulsion;
B. the preparation of mixture: in the described organic emulsion that steps A obtains, add sodium carbonate solution and magnesium salt solution simultaneously, and make the pH value of reaction system maintain 5.0 ~ 11.0, then reaction, to completely, obtains suspension under agitation; Described suspension after filtration, washing obtain filtrate and filter cake respectively, described filter cake obtains the mixture be made up of magnesium basic carbonate/organism after drying;
C. the roasting of mixture: the described mixture obtained by step B obtains nano-MgO and CO after calcination process
2gas.
2. the method preparing nano-MgO according to claim 1, is characterized in that, the mass ratio of described long-chain organism and described tensio-active agent is 100:5 ~ 30; Described distilled water in described mixing solutions and the volume ratio of described ethanol are 100:1 ~ 50.
3. the method preparing nano-MgO according to claim 2, is characterized in that, described long-chain organism is selected from paraffin, stearic acid, sodium stearate, Magnesium Stearate, paraffin crystallite and polyoxyethylene glycol; At least one in polyoxyethylene sorbitan monooleate, glycerol, cetyl trimethylammonium bromide, sodium lauryl sulphate, Sodium dodecylbenzene sulfonate and polyvinylpyrrolidone selected by described tensio-active agent.
4. the method preparing nano-MgO according to any one of claim 1-3, is characterized in that, step C comprises vent gas treatment step: by the described CO obtained
2gas passes in NaOH solution, is prepared into sodium carbonate solution needed for step B after absorbing, and returns step B and recycle.
5. the method preparing nano-MgO according to claim 4, is characterized in that, the described sodium carbonate solution in step B is equal with the volume of described magnesium salt solution, and concentration ratio is 0.5 ~ 2.5:1; The amount concentration of described sodium carbonate solution is 0.1 ~ 1.0mol/L.
6. the method for the preparation according to any one of claim 1-3, is characterized in that, the magnesium salt solution described in step B is MgCl solution; Step B comprises filtrate treatment step: concentrated by described filtrate carrying out, obtain technical grade NaCl after drying treatment.
7. the method preparing nano-MgO according to any one of claim 1-3, is characterized in that, the emulsifying temperature of steps A is 25 ~ 90 DEG C, and emulsification stirring speed is 2000 ~ 10000r/min; The maturing temperature of step C is 600 ~ 750 DEG C, and the grain shape of described nano-MgO is flower-shaped.
8. the method preparing nano-MgO according to any one of claim 1-3, is characterized in that, the emulsifying temperature of steps A is 25 ~ 90 DEG C, and emulsification stirring speed is 2000 ~ 10000r/min; The maturing temperature of step C is 750 ~ 1100 DEG C, and the grain shape of described nano-MgO is hexagonal plate.
9. the method preparing nano-MgO according to any one of claim 1-3, is characterized in that, the emulsifying temperature of steps A is 25 ~ 90 DEG C, and emulsification stirring speed is 2000 ~ 10000r/min; Described magnesium salts in step B is magnesium sulfate; The maturing temperature of step C is 700 ~ 950 DEG C, and the grain shape of described nano-MgO is bar-shaped.
10. the method preparing nano-MgO according to any one of claim 1-3, is characterized in that, the magnesium salts in the described magnesium salt solution in step B is carried by salt lake the magnesium resource that potassium industrial by-product gives up in halogen and obtained.
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| CN105883866A (en) * | 2016-05-20 | 2016-08-24 | 江苏师范大学 | Synthesis method of controllable-length/width basic magnesium carbonate nanorods |
| CN107337937A (en) * | 2017-06-09 | 2017-11-10 | 苏州市泽镁新材料科技有限公司 | A kind of preparation method for the surface-modified nano magnesium oxide material for being exclusively used in SMC thickenings |
| CN107433180A (en) * | 2017-08-23 | 2017-12-05 | 内江师范学院 | A kind of sandwich structure nano adsorber of carbon coating magnesia and preparation method thereof |
| CN108328629A (en) * | 2018-05-16 | 2018-07-27 | 湖南华佳纳米新材料科技有限公司 | A kind of method and system preparing nano magnesia |
| CN108706618A (en) * | 2018-08-28 | 2018-10-26 | 内江师范学院 | Utilize the method for micro-emulsion method for preparing nano aluminium oxide |
| CN109354048A (en) * | 2018-12-13 | 2019-02-19 | 沈阳理工大学 | The method that ionic catalysis magnesite prepares magnesium hydroxide and magnesium carbonate based compound |
| WO2021097658A1 (en) * | 2019-11-19 | 2021-05-27 | 南京先进生物材料与过程装备研究院有限公司 | Polyethylene insulating material for high-voltage direct current cable |
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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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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105883866A (en) * | 2016-05-20 | 2016-08-24 | 江苏师范大学 | Synthesis method of controllable-length/width basic magnesium carbonate nanorods |
| CN105883866B (en) * | 2016-05-20 | 2017-11-07 | 江苏师范大学 | A kind of synthetic method of the controllable basic magnesium carbonate nanometer rods of length and width |
| CN107337937A (en) * | 2017-06-09 | 2017-11-10 | 苏州市泽镁新材料科技有限公司 | A kind of preparation method for the surface-modified nano magnesium oxide material for being exclusively used in SMC thickenings |
| CN107433180A (en) * | 2017-08-23 | 2017-12-05 | 内江师范学院 | A kind of sandwich structure nano adsorber of carbon coating magnesia and preparation method thereof |
| CN108328629A (en) * | 2018-05-16 | 2018-07-27 | 湖南华佳纳米新材料科技有限公司 | A kind of method and system preparing nano magnesia |
| CN108706618A (en) * | 2018-08-28 | 2018-10-26 | 内江师范学院 | Utilize the method for micro-emulsion method for preparing nano aluminium oxide |
| CN109354048A (en) * | 2018-12-13 | 2019-02-19 | 沈阳理工大学 | The method that ionic catalysis magnesite prepares magnesium hydroxide and magnesium carbonate based compound |
| CN109354048B (en) * | 2018-12-13 | 2021-07-27 | 沈阳理工大学 | Method for preparing magnesium hydroxide and magnesium carbonate series compound by ion catalysis of magnesite |
| WO2021097658A1 (en) * | 2019-11-19 | 2021-05-27 | 南京先进生物材料与过程装备研究院有限公司 | Polyethylene insulating material for high-voltage direct current cable |
| CN113413870A (en) * | 2021-05-17 | 2021-09-21 | 中国科学院青海盐湖研究所 | Magnesium oxide-metal sulfide-biomass charcoal composite material and preparation method and application thereof |
| 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 |
| CN115814752B (en) * | 2023-01-31 | 2024-04-05 | 成都理工大学 | Composite material of calcium carbonate and nano magnesium oxide and preparation and application methods thereof |
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