CN112744867B - Method for preparing nano lanthanum strontium manganese oxide powder - Google Patents
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- C01G45/00—Compounds of manganese
- C01G45/12—Manganates manganites or permanganates
- C01G45/1221—Manganates or manganites with a manganese oxidation state of Mn(III), Mn(IV) or mixtures thereof
- C01G45/125—Manganates or manganites with a manganese oxidation state of Mn(III), Mn(IV) or mixtures thereof of the type[MnO3]n-, e.g. Li2MnO3, Li2[MxMn1-xO3], (La,Sr)MnO3
- C01G45/1264—Manganates or manganites with a manganese oxidation state of Mn(III), Mn(IV) or mixtures thereof of the type[MnO3]n-, e.g. Li2MnO3, Li2[MxMn1-xO3], (La,Sr)MnO3 containing rare earth, e.g. La1-xCaxMnO3, LaMnO3
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Abstract
The invention discloses a method for preparing nano lanthanum strontium manganese oxide powder, which comprises the following steps: adding pure water into a mixing barrel, then adding a dispersing agent into the mixing barrel, stirring, adding lanthanum oxide, strontium carbonate and manganese dioxide into the mixing barrel, and performing ball milling to obtain first mixed slurry; adding a binder into the first mixed slurry, and continuously stirring to obtain second mixed slurry; spray drying the second mixed slurry by using a spray dryer to obtain first intermediate powder; placing the first intermediate powder in a vacuum degreasing sintering furnace for calcining and carrying out constant temperature and constant pressure to obtain second intermediate powder; continuously calcining the second intermediate powder and carrying out constant temperature and constant pressure to obtain third intermediate powder; continuously calcining the third intermediate powder and carrying out constant temperature and constant pressure to obtain fourth intermediate powder; and placing the fourth intermediate powder in an ultrasonic vibration screening machine to shake and break and screen to obtain the nano lanthanum strontium manganese oxide powder.
Description
Technical Field
The invention relates to a preparation method of an oxide, in particular to a method for preparing nano lanthanum strontium manganese oxide powder.
Background
Lanthanum strontium manganese oxide (La) 1-x Sr x MnO 3 ) The material is a functional material with wide application, namely lanthanum strontium manganese oxide (La) 1-x Sr x MnO 3 ) The material has perovskite crystal phase structure, can be used as a magneto-resistance material, has great application prospect, and is applied to be made into magnetic heads, magneto-resistance memories, automobile sensors and the like in information storage systems at present. Lanthanum strontium manganese oxide (La) 1-x Sr x MnO 3 ) The material can also be used as a magnetic refrigeration material, and the magnetic refrigeration material also has a great application prospect, and is widely applied to the industries of medical treatment and health, aerospace, automobile equipment and the like at present. Due to lanthanum strontium manganese oxide (La) 1- x Sr x MnO 3 ) The material has unique properties, and has been widely applied to the fields of chemical industry, machinery, electronics and the like in recent years, while the La with the perovskite structure 1-x Sr x MnO 3 Materials have attracted increasing attention in the fields of physics and chemistry because of their giant magnetoresistance properties and catalytic properties.
Preparation of La by the prior art 1-x Sr x MnO 3 The powder method comprises the following steps:
(1) Solid phase reaction method
Is a traditional powdering process, mainly uses pure La 2 O 3 、SrCO 3 And MnO 2 Weighing according to a certain stoichiometric ratio, adding zirconia balls for dry grinding, and then carrying out heat treatment. The solid phase method has simple process flow and is a conventional production methodLa 1-x Sr x MnO 3 Industrial method of powder, but in order to mix the three raw materials uniformly and reduce the particle size of the particles, the ball milling time is very long, and is more than 10 hours; and because the particle size is larger, the reaction time required by high-temperature calcination at the temperature of more than 1000 ℃ is longer than 10 hours; produced La 1-x Sr x MnO 3 The powder is easy to agglomerate, the particle size is larger, the particle size distribution is wide, and the satisfactory particle size is difficult to achieve; and a single-phase perovskite structure is not easily obtained.
(2) Sol-gel process
The sol-gel method is a method of hydrolyzing inorganic salt or metal alkoxide, then polymerizing solute to gelate, or adding a certain amount of organic acid as ligand into the aqueous solution of metal inorganic salt, adjusting the pH value of the system with inorganic acid and alkali, slowly evaporating to obtain gel, drying and roasting the gel to obtain nano powder. For example with La (NO) 3 ) 3 、Sr(NO 3 ) 2 And Mn (NO) 3 ) 2 Adding proper citric acid into the raw materials, adjusting the pH value of the system by using ammonia water, and then preparing the product.
The method has the advantages of low reaction temperature, good uniformity of the synthesized powder and small particle size. But the production process is complex; the metal alkoxide is used as a raw material, so that the cost is high, and the alkoxide has high toxicity, is harmful to human health and is easy to cause environmental pollution; the carbon ligand in the organic ligand is not easy to remove under the non-oxide atmosphere, thereby increasing the content of impurities in the prepared powder.
Aiming at the defects in the prior art, the invention overcomes the technical problem and provides a method for preparing nano lanthanum strontium manganese oxide powder.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for preparing nano lanthanum strontium manganese oxide powder.
In order to achieve the purpose, the invention adopts the following technical scheme.
The invention provides a method for preparing nano lanthanum strontium manganese oxide powder, the molecular formula of the powder is La 1- x Sr x MnO 3 Wherein x is more than or equal to 0.1 and less than or equal to 0.4, and the preparation method comprises the following steps:
s1, preparing pure water, a dispersing agent, a binder, lanthanum oxide, strontium carbonate and manganese dioxide in certain mass;
s2, adding pure water into a mixing barrel, then adding a dispersing agent into the mixing barrel, stirring for 10-20 min, adding lanthanum oxide, strontium carbonate and manganese dioxide into the mixing barrel, and performing ball milling for 240-300 min to obtain first mixed slurry;
s3, adding a binder into the first mixed slurry, and continuously stirring for 30-40 min to obtain a second mixed slurry;
s4, spray drying the second mixed slurry by using a spray dryer to obtain first intermediate powder;
s5, placing the first intermediate powder in a vacuum degreasing sintering furnace, calcining for 180-240 min until the temperature is 400-600 ℃, and then carrying out constant temperature and pressure for 120-180 min to obtain second intermediate powder;
s6, continuously calcining the second intermediate powder for 120-180 min to reach the temperature of 800-1000 ℃, and then carrying out constant temperature and pressure for 120-180 min to obtain third intermediate powder;
s7, continuously calcining the third intermediate powder for 120-180 min to reach the temperature of 1100-1300 ℃, and then carrying out constant temperature and pressure for 120-180 min to obtain fourth intermediate powder;
and S8, placing the fourth intermediate powder in an ultrasonic vibration screening machine to be vibrated, broken and screened to obtain the nano lanthanum strontium manganese oxide powder.
As a further improvement of the invention, the molar ratio of lanthanum oxide, strontium carbonate and manganese dioxide is (0.75-4.5) to 1 (2.5-10).
As a further improvement of the invention, in the spray drying process, the inlet temperature of hot air of the spray dryer is 200-220 ℃, the outlet temperature is 100-125 ℃, the rotating speed of an atomizer of a spray drying tower is 10000-20000 rpm, and the rotating speed of a peristaltic pump is 100-180 rpm.
As a further improvement of the invention, in the screening process, the frequency of the ultrasonic vibration screening machine is set to be 15 KHz-18 KHz, and the screened screen is 1340 meshes.
As a further improvement of the invention, the particle size of the first mixed slurry is 0.1 to 2 μm.
As a further improvement of the invention, the mass of the dispersing agent is 2-3% of the total mass of lanthanum oxide, strontium carbonate and manganese dioxide, and the mass of the binder is 5-8% of the total mass of lanthanum oxide, strontium carbonate and manganese dioxide.
As a further improvement of the invention, the dispersant is one of triethyl hexyl phosphoric acid, sodium dodecyl sulfate, cellulose derivatives, hydroxymethyl cellulose and sodium lignosulphonate.
As a further improvement of the invention, the binder is at least one of polyvinyl alcohol, polyethylene glycol and polyvinyl acetate.
As a further improvement of the invention, the mass of the pure water is 40-50% of the total mass of the pure water, the lanthanum oxide, the strontium carbonate and the manganese dioxide.
As a further improvement of the invention, the purity of lanthanum oxide is more than or equal to 2.5N and the grain diameter is less than or equal to 25 mu m, the purity of strontium carbonate is more than or equal to 2.5N and the grain diameter is less than or equal to 25 mu m, and the purity of lanthanum oxide is more than or equal to 3N and the grain diameter is less than or equal to 25 mu m.
The invention provides a method for preparing nanometer lanthanum strontium manganese oxide powder, which combines the advantages and disadvantages of a sol-gel method, wherein a small amount of dispersant and binder added in the preparation process are organic solvents, additives are completely volatilized in the sintering process, impurities are not introduced, acid or alkali is not used for adjusting pH in the preparation process, and the purity of the lanthanum strontium manganese oxide powder is not influenced.
Detailed Description
The technical solutions will be described clearly and completely in the following with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The invention provides a method for preparing nano lanthanum strontiumMethod for preparing manganese oxide powder with molecular formula of La 1- x Sr x MnO 3 Wherein x is more than or equal to 0.1 and less than or equal to 0.4, and the preparation method comprises the following steps:
s1, preparing pure water, a dispersing agent, a binder, lanthanum oxide, strontium carbonate and manganese dioxide with certain mass.
In some embodiments of the invention, the molar ratio of lanthanum oxide, strontium carbonate and manganese dioxide is (0.75-4.5): 1 (2.5-10), the purity of lanthanum oxide is more than or equal to 2.5N, the particle size is less than or equal to 25 μm, the purity of strontium carbonate is more than or equal to 2.5N, the particle size is less than or equal to 25 μm, the purity of lanthanum oxide is more than or equal to 3N, and the particle size is less than or equal to 25 μm.
In some embodiments of the present invention, the dispersant is one of triethylhexyl phosphoric acid, sodium dodecyl sulfate, cellulose derivative, hydroxymethyl cellulose, and sodium lignosulfonate, and the binder is at least one of polyvinyl alcohol, polyethylene glycol, and polyvinyl acetate
In some embodiments of the invention, the dispersant is present in an amount of 2 to 3% by mass of the total mass of lanthanum oxide, strontium carbonate and manganese dioxide, and the binder is present in an amount of 5 to 8% by mass of the total mass of lanthanum oxide, strontium carbonate and manganese dioxide.
In some embodiments of the invention, the mass of the pure water is 40-50% of the total mass of the pure water, lanthanum oxide, strontium carbonate and manganese dioxide, so that the particles can be effectively bonded, the use amount of the pure water is reduced, the moisture of the powder can be quickly evaporated in the spray drying process, and the environment cannot be polluted.
S2, adding pure water into the mixing barrel, then adding a dispersing agent into the mixing barrel, stirring for 10-20 min, then adding lanthanum oxide, strontium carbonate and manganese dioxide into the mixing barrel, and performing ball milling for 240-300 min to obtain first mixed slurry.
In some embodiments of the invention, the purpose of adding the dispersing agent into the mixing barrel and stirring for 10-20 min is to uniformly stir and disperse the dispersing agent, thereby preventing the subsequently added materials from agglomerating.
In some embodiments of the invention, lanthanum oxide, strontium carbonate and manganese dioxide with the particle size of less than or equal to 25 μm are added, and ball milling is carried out for 240-300 min to obtain the first mixed slurry with the particle size of 0.1-2 μm.
And S3, adding a binder into the first mixed slurry, and continuously stirring for 30-40 min to obtain a second mixed slurry.
In some embodiments of the invention, the binder completely encapsulates the lanthanum oxide, strontium carbonate, and manganese dioxide powder in the second mixed slurry obtained after stirring for 30-40 min.
And S4, spray drying the second mixed slurry by using a spray dryer to obtain first intermediate powder.
In some embodiments of the invention, during the spray drying process, the inlet temperature of the hot air of the spray dryer is 200-220 ℃, the outlet temperature is 100-125 ℃, the rotation speed of the atomizer of the spray drying tower is 10000-20000 rpm, and the rotation speed of the peristaltic pump is 100-180 rpm.
S5, placing the first intermediate powder in a vacuum degreasing sintering furnace, calcining for 180-240 min until the temperature is 400-600 ℃, and then carrying out constant temperature and pressure for 120-180 min to obtain second intermediate powder.
In some embodiments of the invention, the first intermediate powder is heated to 400-600 ℃ and introduced with circulating hot air to thermally decompose organic solvents such as binders and dispersants among particles in the oxide particles, and finally discharged in a gas form, wherein the temperature range is La 2 O 3 Absorbing heat to generate crystal transformation of SrCO 3 Absorbing heat, loose structure and simultaneously reacting the two to generate La 2 SrO 4 。
S6, continuously calcining the second intermediate powder for 120-180 min to reach the temperature of 800-1000 ℃, and then carrying out constant temperature and pressure for 120-180 min to obtain third intermediate powder.
In some embodiments of the invention, after the second intermediate powder is heated to 800-1000 ℃, mnO is added under the environment of 800-1000 DEG C 2 Will decompose into Mn 2 O 3 ，Mn 2 O 3 Will follow La 2 O 3 LaMnO is generated in this temperature range 3 ，LaMnO 3 And La 2 SrO 4 Formation of La ( 1 - x ) Sr x MnO 3 。
S7, continuously calcining the third intermediate powder for 120-180 min until the temperature is 1100-1300 ℃, and then carrying out constant temperature and constant pressure for 120-180 min to obtain fourth intermediate powder.
In some embodiments of the invention, the temperature of the third intermediate powder is finally raised to 1100-1300 ℃ and La ( 1 - x ) Sr x MnO 3 The crystal forms grow continuously.
And S8, placing the fourth intermediate powder in an ultrasonic vibration screening machine to be vibrated and broken and screening to obtain the nano lanthanum strontium manganese oxide powder.
As a further improvement of the invention, in the screening process, the frequency of the ultrasonic vibration screening machine is set to be 15 KHz-18 KHz, and the screened screen is 1340 meshes.
For further understanding of the present invention, the method and effects of the present invention will be described in further detail with reference to specific examples. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
Example 1.
(1) Preparing 2.65 Kg of pure water, 0.133 Kg of hydroxymethyl cellulose as a dispersant, 0.53 Kg of polyethylene glycol as a binder, 2.932 Kg of lanthanum oxide with purity not less than 2.5N and particle size not more than 25 μm, 0.150 Kg of strontium carbonate with purity not less than 2.5N and particle size not more than 25 μm, and 0.895 Kg of manganese dioxide with purity not less than 3N and particle size not more than 25 μm;
(2) Adding pure water into a mixing barrel, then adding a dispersing agent into the mixing barrel, stirring for 10min, then adding lanthanum oxide, strontium carbonate and manganese dioxide into the mixing barrel, and ball-milling for 240min to obtain first mixed slurry with the particle size D90 of 1.89 mu m;
(3) Adding a binder into the first mixed slurry, and continuously stirring for 30 min to obtain second mixed slurry;
(4) In the process of spray drying the second mixed slurry by using a spray dryer to obtain first intermediate powder, the inlet temperature of hot air of the spray dryer is 200 ℃, the outlet temperature of the hot air of the spray dryer is 100 ℃, the rotating speed of an atomizer of a spray drying tower is 10000 rpm, and the rotating speed of a peristaltic pump is 180rpm;
(5) Placing the first intermediate powder in a vacuum degreasing sintering furnace, calcining for 180min to 400 ℃, and then carrying out constant temperature and pressure for 120 min to obtain second intermediate powder;
(6) Continuously calcining the second intermediate powder for 120 min to reach the temperature of 800 ℃, and then carrying out constant temperature and pressure for 120 min to obtain third intermediate powder;
(7) Continuously calcining the third intermediate powder for 180min to 1100 ℃, and then carrying out constant temperature and pressure for 180min to obtain fourth intermediate powder;
(8) Placing the fourth intermediate powder in an ultrasonic vibration screening machine, setting the frequency of the ultrasonic vibration screening machine to be 15KHz, screening with a screen of 1340 meshes, vibrating, crushing and screening to obtain the powder with the theoretical chemical formula of La 0.9 Sr 0.1 MnO 3 Lanthanum strontium manganese oxide powder.
The powder has an average particle diameter of 6.5 μm and a specific surface area of 7349 m 2 /Kg。
Example 2.
(1) Preparing 4.278 Kg of pure water, 0.256 Kg of hydroxymethyl cellulose as a dispersing agent, 0.428 Kg of polyvinyl alcohol as a binding agent, 2.444 Kg of lanthanum oxide with the purity not less than 2.5N and the grain diameter not more than 25 mu m, 0.748 Kg of strontium carbonate with the purity not less than 2.5N and the grain diameter not more than 25 mu m and 1.087 Kg of manganese dioxide with the purity not less than 3N and the grain diameter not more than 25 mu m;
(2) Adding pure water into a mixing barrel, then adding a dispersing agent into the mixing barrel, stirring for 20min, adding lanthanum oxide, strontium carbonate and manganese dioxide into the mixing barrel, and ball-milling for 300min to obtain first mixed slurry with the particle size D90 of 1.31 mu m;
(3) Adding a binder into the first mixed slurry, and continuously stirring for 40min to obtain a second mixed slurry;
(4) In the spray drying process of obtaining the first intermediate powder by using a spray dryer to spray-dry the second mixed slurry, the inlet temperature of hot air of the spray dryer is 220 ℃, the outlet temperature is 125 ℃, the rotating speed of an atomizer of a spray drying tower is 20000rpm, and the rotating speed of a peristaltic pump is 100 rpm;
(5) Placing the first intermediate powder in a vacuum degreasing sintering furnace, calcining for 240min to 600 ℃, and then carrying out constant temperature and pressure of 180min to obtain second intermediate powder;
(6) Continuously calcining the second intermediate powder for 180min to reach the temperature of 1000 ℃, and then carrying out constant temperature and pressure for 180min to obtain third intermediate powder;
(7) Continuously calcining the third intermediate powder for 120 min till the temperature is 1300 ℃, and then carrying out constant temperature and constant pressure for 120 min to obtain fourth intermediate powder;
(8) Placing the fourth intermediate powder in an ultrasonic vibration screening machine, setting the frequency of the ultrasonic vibration screening machine to be 18KHz, screening with a screen of 1340 meshes, vibrating, crushing and screening to obtain the powder with the theoretical chemical formula of La 0.6 Sr 0.4 MnO 3 Lanthanum strontium manganese oxide powder.
The powder has an average particle diameter of 2.3 μm and a specific surface area of 10357 m 2 /Kg。
Example 3.
(1) Preparing 3.485 Kg of pure water, 0.182 Kg of hydroxymethyl cellulose as a dispersing agent, 0.436 Kg of mixed solvent of polyvinyl alcohol and polyethylene glycol as a binding agent, 2.606 Kg of lanthanum oxide with purity more than or equal to 2.5N and particle size less than or equal to 25 μm, 0.299 Kg of strontium carbonate with purity more than or equal to 2.5N and particle size less than or equal to 25 μm and 0.869 Kg of manganese dioxide with purity more than or equal to 3N and particle size less than or equal to 25 μm;
(2) Adding pure water into a mixing barrel, then adding a dispersing agent into the mixing barrel, stirring for 20min, adding lanthanum oxide, strontium carbonate and manganese dioxide into the mixing barrel, and ball-milling for 300min to obtain first mixed slurry with the particle size D90 of 1.46 mu m;
(3) Adding a binder into the first mixed slurry, and continuously stirring for 35 min to obtain a second mixed slurry;
(4) In the process of spray drying the second mixed slurry by using a spray dryer to obtain first intermediate powder, the inlet temperature of hot air of the spray dryer is 210 ℃, the outlet temperature of the hot air of the spray dryer is 110 ℃), the rotating speed of an atomizer of a spray drying tower is 18000 rpm, and the rotating speed of a peristaltic pump is 125 rpm;
(5) Calcining the first intermediate powder in a vacuum degreasing sintering furnace for 240min to 470 ℃, and then carrying out constant temperature and pressure for 150 min to obtain second intermediate powder;
(6) Continuously calcining the second intermediate powder for 150 min to reach the temperature of 950 ℃, and then carrying out constant temperature and pressure for 150 min to obtain third intermediate powder;
(7) Continuously calcining the third intermediate powder for 150 min to 1150 ℃, and then carrying out constant temperature and pressure for 150 min to obtain fourth intermediate powder;
(8) Placing the fourth intermediate powder in an ultrasonic vibration screening machine, setting the frequency of the ultrasonic vibration screening machine to be 18KHz, screening with a screen of 1340 meshes, vibrating, crushing and screening to obtain the powder with the theoretical chemical formula of La 0.8 Sr 0.2 MnO 3 Lanthanum strontium manganese oxide powder.
The powder has the average particle diameter of 3.5 mu m and the specific surface area of 11593 m 2 /Kg。
The invention provides a method for preparing nanometer lanthanum strontium manganese oxide powder, which combines the advantages and disadvantages of a sol-gel method, wherein a small amount of dispersant and binder added in the preparation process are organic solvents, additives are completely volatilized in the sintering process, impurities are not introduced, acid or alkali is not used for adjusting pH in the preparation process, and the purity of the lanthanum strontium manganese oxide powder is not influenced.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.
Claims (4)
1. A method for preparing nano lanthanum strontium manganese oxide powder is characterized in that the molecular formula of the powder is La 1- x Sr x MnO 3 Wherein x is more than or equal to 0.1 and less than or equal to 0.2, and the preparation steps are as follows:
s1, preparing pure water, a dispersing agent, a binder, lanthanum oxide, strontium carbonate and manganese dioxide with certain mass;
s2, adding pure water into a mixing barrel, then adding a dispersing agent into the mixing barrel, stirring for 10-20 min, adding lanthanum oxide, strontium carbonate and manganese dioxide into the mixing barrel, and performing ball milling for 240-300 min to obtain first mixed slurry;
s3, adding a binder into the first mixed slurry, and continuously stirring for 30-40 min to obtain second mixed slurry;
s4, spray drying the second mixed slurry by using a spray dryer to obtain first intermediate powder;
s5, placing the first intermediate powder in a vacuum degreasing sintering furnace, calcining for 180-240 min to reach the temperature of 400-600 ℃, introducing circulating hot air to thermally decompose the binder and the dispersant among the particles in the oxide particles, and finally discharging the oxide particles in a gas form, wherein the temperature range is La 2 O 3 Absorbing heat to generate crystal transformation of SrCO 3 Absorbing heat, loose structure and simultaneously reacting the two to generate La 2 SrO 4 Then carrying out constant temperature and pressure for 120-180 min to obtain second intermediate powder;
s6, continuously calcining the second intermediate powder for 120-180 min to reach the temperature of 800-1000 ℃, and under the environment of 800-1000 ℃, mnO 2 Will decompose into Mn 2 O 3 ，Mn 2 O 3 Will follow La 2 O 3 LaMnO is generated in this temperature range 3 ，LaMnO 3 And La 2 SrO 4 Formation of La (1-x) Sr x MnO 3 Then carrying out constant temperature and pressure for 120-180 min to obtain third intermediate powder;
s7, continuously calcining the third intermediate powder for 120-180 min to reach the temperature of 1100-1300 ℃, and La (1-x) Sr x MnO 3 The crystal form continuously grows, and then constant temperature and pressure are carried out for 120-180 min to obtain fourth intermediate powder;
s8, placing the fourth intermediate powder in an ultrasonic vibration screening machine to be vibrated, broken and screened to obtain nano lanthanum strontium manganese oxide powder;
the molar ratio of the lanthanum oxide to the strontium carbonate to the manganese dioxide is (0.75-4.5) to 1 (2.5-10); in the spray drying process, the inlet temperature of hot air of the spray dryer is 200-220 ℃, the outlet temperature is 100-125 ℃, the rotating speed of an atomizer of a spray drying tower is 10000-20000 rpm, and the set rotating speed of a peristaltic pump is 100-180 rpm;
the mass of the dispersing agent is 2-3% of the total mass of lanthanum oxide, strontium carbonate and manganese dioxide, and the mass of the binder is 5-8% of the total mass of lanthanum oxide, strontium carbonate and manganese dioxide;
the dispersing agent is one of triethyl hexyl phosphoric acid, sodium dodecyl sulfate, cellulose derivatives, hydroxymethyl cellulose and sodium lignosulphonate;
the binder is vinyl acetate;
the mass of the pure water is 40-50% of the total mass of the pure water, the lanthanum oxide, the strontium carbonate and the manganese dioxide.
2. The method for preparing nano lanthanum strontium manganese oxide powder according to claim 1, wherein in the screening process, the frequency of an ultrasonic vibration screening machine is set to be 15 KHz-18 KHz, and the screened screen is 1340 meshes.
3. The method of claim 1, wherein the first mixed slurry has a particle size of 0.1-2 μm.
4. The method for preparing nano lanthanum strontium manganese oxide powder according to claim 1, wherein the purity of lanthanum oxide is not less than 2.5N and the particle size is not more than 25 μm, the purity of strontium carbonate is not less than 2.5N and the particle size is not more than 25 μm, and the purity of lanthanum oxide is not less than 3N and the particle size is not more than 25 μm.
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