CN117105669A - High-heat-conductivity wide-solar-spectrum-response photo-thermal conversion material and preparation method thereof - Google Patents
High-heat-conductivity wide-solar-spectrum-response photo-thermal conversion material and preparation method thereof Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 54
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 46
- 238000001228 spectrum Methods 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title abstract description 14
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000000203 mixture Substances 0.000 claims abstract description 29
- 239000002994 raw material Substances 0.000 claims abstract description 24
- 229910010413 TiO 2 Inorganic materials 0.000 claims abstract description 12
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- 238000001035 drying Methods 0.000 claims description 23
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- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 16
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- 238000005516 engineering process Methods 0.000 description 3
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- 235000012211 aluminium silicate Nutrition 0.000 description 1
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 229910052850 kyanite Inorganic materials 0.000 description 1
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- 229910052760 oxygen Inorganic materials 0.000 description 1
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- 230000001681 protective effect Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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Abstract
The application relates to a high-heat-conductivity wide-solar spectrum-response photo-thermal conversion material and a preparation method thereof, wherein the material comprises the following raw materials in percentage by mass: 65% -75% of SiC, al 2 O 3 10％～14％，TiO 2 2.5％～3.5％，Fe 2 O 3 2.5％～3.5％，MnO 2 10 to 14 percent. The preparation method comprises the following steps: uniformly mixing the raw materials according to the mass percentage to obtain a mixture; adding a proper amount of water or PVA water solution into the mixture to form a binder, and then extruding, rounding and granulating to obtain a green body; and sintering the dried green body at 1250-1400 ℃ to prepare the high-heat-conductivity wide-solar spectrum-response photo-thermal conversion material. The heat absorption particle with SiC as the main material has excellent spectral absorptivity, higher heat conductivity and excellent oxidation resistance and thermal shock resistance.
Description
Technical Field
The application relates to an inorganic composite material and a preparation method thereof, in particular to a photo-thermal conversion material with high heat conduction and wide solar spectrum response and a preparation method thereof.
Background
The direct photo-thermal conversion and utilization of solar energy is a solar energy high-efficiency utilization technology with great potential. Solar photo-thermal power generation technology has gradually developed to 800 ℃ and even higher operation parameters, however, the higher operation temperature needs to develop and research a novel high-temperature-resistant photo-thermal conversion material, and meanwhile, the photo-thermal conversion material is required to have higher spectral absorptivity and higher thermal conductivity and also has good anti-seismic and antioxidant capabilities in consideration of practical factors in the operation process. Therefore, the development of a photo-thermal conversion material with high solar spectrum capturing and absorbing performance as a core is one of the important directions of the recent research of solar photo-thermal power generation technology.
Ceramic materials generally have the characteristics of high temperature resistance, corrosion resistance and oxidation resistance, so the ceramic materials naturally have the advantage of becoming novel high temperature resistant materials. As a novel high-temperature-resistant photothermal conversion material, it is also necessary to combine high thermal conductivity with high spectral absorptivity. For example, patent CN111253158B discloses a solar heat-absorbing ceramic material prepared from SiC, corundum powder and kaolin powder, which has a high heat storage density, but has a spectral absorptivity of only 91.6%, a thermal conductivity of only 3.49W/(m·k), and the defects of low thermal conductivity, low absorptivity and the like at present. As another example, patent CN104671711a discloses a heat storage material prepared by using brown alumina and white corundum as aggregate, alumina sol, activated alumina powder, kyanite, silica micropowder and silicon carbide as additives, and the heat conductivity is 1.93W/(m·k), and the existing heat storage material has the defects of low heat conductivity and the like.
Therefore, the performance of high thermal conductivity and high spectral absorptivity cannot be realized by a single ceramic material, so that development of a solar photo-thermal conversion material with both high thermal conductivity and high spectral absorptivity is urgently needed.
Disclosure of Invention
The application aims to: the application aims to provide a photo-thermal conversion material with high thermal conductivity and high spectral absorption, high thermal conductivity and wide solar spectral response;
the second purpose of the application is to provide a preparation method of the photo-thermal conversion material with high heat conduction and wide solar spectral response.
The technical scheme is as follows: the application relates to a high-heat-conductivity wide-solar spectrum-response photo-thermal conversion material, which comprises the following raw materials in percentage by mass: 65% -75% of SiC, al 2 O 3 10％～14％，TiO 2 2.5％～3.5％，Fe 2 O 3 2.5％～3.5％，MnO 2 10％～14％。
Wherein the SiC is a silicon carbide alloy, wherein the SiC,Al 2 O 3 ，TiO 2 ，Fe 2 O 3 ，MnO 2 the particle size of the particles is 25 to 250 meshes.
The preparation method of the high-heat-conductivity wide-solar-spectrum-response photo-thermal conversion material comprises the following steps of:
(1) Mixing the raw materials according to the mass percentage to obtain a primary mixture;
(2) Ball milling is carried out on the primary mixture, and the mixture is dried after uniform mixing to obtain the mixture;
(3) Adding water or PVA water solution into the mixture, granulating, and drying to obtain a green body;
(4) And firing and molding the green body at 1250-1400 ℃ to obtain the high-heat-conductivity wide-solar spectrum-response photo-thermal conversion material.
In the step (2), the preliminary mixture is mixed with water or ethanol to form a suspension before ball milling, the suspension is subjected to ultrasonic vibration dispersion treatment, the ultrasonic frequency is 20-40 KHz, the power is 300-400W, and the dispersion time is 30-60 min; the raw powder attached to the container wall is oscillated into the suspension, and preliminary mixing of the suspension is completed.
In the step (2), the rotating speed of the ball milling is 20-30 r/min, and the ball milling is dried after the end of the ball milling; the raw powder in the suspension is fully mixed.
In the step (3), adding PVA water solution into the mixture, wherein the addition amount of the PVA water solution is 5-10 wt% of the total mass of the mixture; the mixture has certain viscosity, and is convenient for subsequent extrusion and granulation.
Wherein, in the step (3), PVA aqueous solution is added into the mixture, and the concentration of the PVA aqueous solution is 2-5 wt%; the plasticity and viscosity of the additive mixture.
Wherein, in the step (3), the granulating process comprises the steps of extrusion and rounding, the grain diameter is kept below 25 meshes after extrusion by sieving, and then a rounding machine is used for rounding, and the rotating speed is 200-300 r/min; and (3) preparing the green powder into a granular green body, and modifying the appearance of the green body.
Wherein, in the step (3), the drying condition is kept at 50-70 ℃ for 2-5 h; and removing redundant water in the green body, and avoiding the influence of the redundant water on calcination.
In the step (4), the calcining process is as follows: heating to 1250-1400 ℃ at 5-10 ℃/min, preserving heat for 9-11 h, cooling to 500 ℃ or below at 2-5 ℃/min, and then naturally cooling to normal temperature to obtain the high-heat-conductivity wide-solar-spectrum-response photo-thermal conversion material. The heating and cooling processes should not be too fast to avoid particle fragmentation, and the temperature range is the optimal range obtained through a series of experiments.
In the step (4), the green body is paved at the bottom of the crucible, and is sintered and formed at 1250-1400 ℃.
The principle of the application: the photo-thermal conversion material taking SiC as the main crystal phase has good heat absorption effect, strong heat conduction capability and strong oxidation resistance; siC as the main crystal phase has better spectral absorption performance, and Fe is added into the formula 2 O 3 And MnO 2 Nonferrous metal oxides to enhance their spectral absorptivity; siC is taken as a main crystal phase, has good heat conduction capacity, improves the density of the blank by adopting a granulation mode of extrusion and spheronization, and meanwhile, tiO in the formula 2 With MnO 2 The sintering-assisting function is achieved, and the density of the material is improved; al (Al) 2 O 3 The silicon carbide is protected in the formula, and meanwhile, the SiC is oxidized to generate SiO in a small amount 2 The inner layer SiC is well protected, and a layer of fully oxidized protective film is formed on the surface of the sample, so that the damage of oxygen to the inside is prevented. The components of the formula except SiC are all oxides, so that the whole material has good stability and extremely strong oxidation resistance.
The beneficial effects are that: compared with the prior art, the application has the following remarkable effects: (1) SiC is taken as a main crystal phase to compound Al 2 O 3 、TiO 2 、Fe 2 O 3 、MnO 2 The photo-thermal conversion material has high heat conductivity and spectrum absorption; (2) The high-heat-conductivity wide-solar-spectrum-response photo-thermal conversion material has important significance for improving the operation efficiency, the service life, the stability and the like of the next-generation solar thermal power generation.
Drawings
FIG. 1 is a photograph of a sample prepared in example 1 of the present application;
FIG. 2 is a graph showing the change in the absorption rate of the weighted spectrum of the sample prepared in example 2 of the present application before and after 30 thermal shocks;
FIG. 3 is a graph showing the thermal conductivity of the sample prepared in example 2 of the present application in comparison to other materials disclosed in the patent of the present application;
FIG. 4 shows the mass change of the sample prepared in example 1 of the present application during a thermal shock cycle at 200℃to 800 ℃;
FIG. 5 is a photograph of a sample prepared in comparative example 1 of the present application;
FIG. 6 is a photograph of a sample prepared in comparative example 2 of the present application;
FIG. 7 is a photograph of a sample prepared in comparative example 3 of the present application.
Detailed Description
The present application is described in further detail below.
Example 1
A preparation method of a photo-thermal conversion material with high heat conduction and wide solar spectrum response comprises the following steps:
(1) Mixing the raw materials: the weight percentage of the raw materials is as follows: siC powder 75%, al 2 O 3 Powder 10% TiO 2 Powder 2.5%, fe 2 O 3 2.5% of powder, mnO 2 10% of powder, weighing the raw materials, adding a proper amount of water or ethanol, performing ultrasonic oscillation and preliminary mixing, wherein the ultrasonic frequency is 40KHz, the power is 400W, and the dispersion time is 30min. And then ball milling and mixing are carried out for 2 hours, the rotation speed of ball milling is 30r/min, and raw powder is obtained after mixing is finished and drying is carried out.
(2) Granulating: adding PVA water solution or deionized water into the raw powder, wherein the addition amount is 5wt% of the total mass of the mixture; the concentration of the PVA aqueous solution was 5% by weight. Extruding the obtained green bricks with moderate dry humidity, sieving the extruded green bricks to keep the grain size below 25 meshes, and then rounding the green bricks by using a rounding machine; wherein the rotating speed of the rounding machine is 300r/min;
(3) And (5) drying and forming: placing the green body in a drying oven at 70 ℃ for 2 hours;
(4) Calcining: and paving the dried green body at the bottom of the ark crucible, adopting pressureless sintering, heating to 1350 ℃ according to 5 ℃/min, cooling to 500 ℃ according to 5 ℃/min after heat preservation for 11 hours, and then naturally cooling to normal temperature to obtain the high-heat-conduction wide-solar-spectrum-response photo-thermal conversion material.
Through tests, the porosity of the photo-thermal conversion material with high heat conduction and wide solar spectral response prepared in the embodiment is 47.63%, and the absorptivity is: 92.2%, emissivity at 800 ℃ is: 85.4% of a material having a thermal conductivity of: 8.5W/(m.K), the thermal shock resistance circulation at room temperature-1000 ℃ is 90 times without cracking, the heat storage density is 1547kj/kg, and the thermal re-circulation mass change rate at room temperature-800 ℃ is less than 0.25%. The black color of the sample was observed by fig. 1, and the particles were full. It can be observed from fig. 4 that example 1 is very stable during the thermal shock cycle with a very small rate of mass change.
Example 2
A preparation method of a photo-thermal conversion material with high heat conduction and wide solar spectrum response comprises the following steps:
(1) Mixing the raw materials: the weight percentage of the raw materials is as follows: 65% of SiC powder and 65% of Al 2 O 3 Powder 14% TiO 2 3.5% of powder and Fe 2 O 3 3.5% of powder, mnO 2 14% of powder, weighing the raw materials, adding a proper amount of water or ethanol, performing ultrasonic oscillation and preliminary mixing, wherein the ultrasonic frequency is 40KHz, the power is 400W, and the dispersion time is 30min. And then ball milling and mixing are carried out for 2 hours, the rotation speed of ball milling is 30r/min, and raw powder is obtained after mixing is finished and drying is carried out.
(2) Granulating: adding PVA water solution or deionized water into the raw powder, wherein the addition amount is 5wt% of the total mass of the mixture; the concentration of the PVA aqueous solution was 5% by weight. Extruding the obtained green bricks with moderate dry humidity, sieving the extruded green bricks to keep the grain size below 25 meshes, and then rounding the green bricks by using a rounding machine; wherein the rotating speed of the rounding machine is 300r/min;
(3) And (5) drying and forming: placing the green body in a drying oven at 70 ℃ for 2 hours;
(4) Calcining: and paving the dried green body at the bottom of the ark crucible, adopting pressureless sintering, heating to 1350 ℃ according to 5 ℃/min, cooling to 500 ℃ according to 5 ℃/min after heat preservation for 11 hours, and then naturally cooling to normal temperature to obtain the high-heat-conduction wide-solar-spectrum-response photo-thermal conversion material.
Through tests, the porosity of the photo-thermal conversion material with high heat conduction and wide solar spectral response prepared in the embodiment is 47.63%, and the absorptivity is: 93.8%, and the emissivity at 800 ℃ is: 82.4% of a thermal conductivity: 8.7W/(m.K), the thermal shock resistance circulation at room temperature-1000 ℃ is 90 times without cracking, the heat storage density is 1425kj/kg, and the thermal re-circulation mass change rate at room temperature-800 ℃ is less than 0.25%.
It can be observed from fig. 2 that the weighted spectral absorbance change after thermal shock is small in example 2 and still above 90%, and the sample performance is stable.
It can be seen from fig. 3 that the heat conductive properties of example 2 are very advantageous compared to other patent publication materials.
Example 3
On the basis of example 1, unlike example 1, in step (2), the concentration of the aqueous PVA solution was 2% by weight; the ultrasonic frequency is 20KHz, the power is 300W, and the dispersion time is 60min; the rotating speed of ball milling is 20r/min; in the step (3), placing the green body in a drying oven at 50 ℃ for 5 hours; in the step (4), the temperature is increased to 1400 ℃ according to 10 ℃/min, and the temperature is reduced to 400 ℃ at 2 ℃/min after the heat preservation is carried out for 9 hours; the rotational speed of the spheronizer is 200r/min.
Example 4
On the basis of example 1, in step (4), the temperature was raised to 1250℃at 10℃per minute, and the temperature was kept for 9 hours and then lowered to 300℃at 2℃per minute, unlike example 1.
Comparative example 1
A preparation method of a solar photo-thermal conversion material comprises the following steps:
1) Mixing the raw materials: the weight percentage of the raw materials is as follows: siC powder 75%, al 2 O 3 Powder 10% TiO 2 Powder 2.5%, fe 2 O 3 2.5% of powder, mnO 2 10% of powder, weighing the raw materials, adding a proper amount of water or ethanol, performing ultrasonic oscillation and preliminary mixing, wherein the ultrasonic frequency is 40KHz, the power is 400W, and the dispersion time is 30min. And then ball milling and mixing are carried out for 2 hours, the rotation speed of ball milling is 30r/min, and raw powder is obtained after mixing is finished and drying is carried out.
(2) Granulating: adding PVA water solution or deionized water into the raw powder, wherein the addition amount is 5wt% of the total mass of the mixture; the concentration of the PVA aqueous solution was 5% by weight. Extruding the obtained green bricks with moderate dry humidity, sieving the extruded green bricks to keep the grain size below 25 meshes, and then rounding the green bricks by using a rounding machine; wherein the rotating speed of the rounding machine is 300r/min;
3) And (5) drying and forming: placing the green body in a drying oven at 70 ℃ for 2 hours;
4) Calcining: and paving the dried green body at the bottom of the ark crucible, adopting pressureless sintering, heating to 1000 ℃ according to 5 ℃/min, cooling to 500 ℃ according to 5 ℃/min after heat preservation for 11 hours, and then naturally cooling to normal temperature to obtain the solar photo-thermal conversion material.
The color shift of this sample was observed by fig. 5, and the weighted spectral absorbance of this sample was only 57.6% as tested.
Comparative example 2
A preparation method of a solar photo-thermal conversion material comprises the following steps:
1) Mixing the raw materials: the weight percentage of the raw materials is as follows: siC powder 75%, al 2 O 3 Powder 10% TiO 2 Powder 2.5%, fe 2 O 3 2.5% of powder, mnO 2 10% of powder, weighing the raw materials, adding a proper amount of water or ethanol, performing ultrasonic oscillation and preliminary mixing, wherein the ultrasonic frequency is 40KHz, the power is 400W, and the dispersion time is 30min. And then ball milling and mixing are carried out for 2 hours, the rotation speed of ball milling is 30r/min, and raw powder is obtained after mixing is finished and drying is carried out.
(2) Granulating: adding PVA water solution or deionized water into the raw powder, wherein the addition amount is 5wt% of the total mass of the mixture; the concentration of the PVA aqueous solution was 5% by weight. Extruding the obtained green bricks with moderate dry humidity, sieving the extruded green bricks to keep the grain size below 25 meshes, and then rounding the green bricks by using a rounding machine; wherein the rotating speed of the rounding machine is 300r/min;
3) And (5) drying and forming: placing the green body in a drying oven at 70 ℃ for 2 hours;
4) Calcining: and paving the dried green body at the bottom of the ark crucible, adopting pressureless sintering, heating to 1450 ℃ according to 5 ℃/min, cooling to 500 ℃ according to 5 ℃/min after heat preservation for 11h, and then naturally cooling to normal temperature to obtain the solar photo-thermal conversion material with both high heat conductivity and hyperspectral absorption.
It can be observed from FIG. 6 that the sample was severely melted and could not be formed due to the excessive temperature
Comparative example 3
A preparation method of a solar photo-thermal conversion material comprises the following steps:
1) Mixing the raw materials: the weight percentage of the raw materials is as follows: siC powder 75%, al 2 O 3 12.5% of powder and TiO 2 12.5% of powder, weighing the raw materials, adding a proper amount of water or ethanol, carrying out ultrasonic oscillation and preliminary mixing, wherein the ultrasonic frequency is 40KHz, the power is 400W, and the dispersion time is 30min. And then ball milling and mixing are carried out for 2 hours, the rotation speed of ball milling is 30r/min, and raw powder is obtained after mixing is finished and drying is carried out.
(2) Granulating: adding PVA water solution or deionized water into the raw powder, wherein the addition amount is 5wt% of the total mass of the mixture; the concentration of the PVA aqueous solution was 5% by weight. Extruding the obtained green bricks with moderate dry humidity, sieving the extruded green bricks to keep the grain size below 25 meshes, and then rounding the green bricks by using a rounding machine; wherein the rotating speed of the rounding machine is 300r/min;
3) And (5) drying and forming: placing the green body in a drying oven at 70 ℃ for 2 hours;
4) Calcining: and paving the dried green body at the bottom of the ark crucible, adopting pressureless sintering, heating to 1350 ℃ according to 5 ℃/min, cooling to 500 ℃ according to 5 ℃/min after heat preservation for 11 hours, and then naturally cooling to normal temperature to obtain the solar photo-thermal conversion material.
It can be observed from fig. 7 that the sample color becomes lighter, the absorptivity is only 78% and the mechanical properties are very poor due to the absence of the nonferrous metal oxide.
Comparative example 4
A preparation method of a solar photo-thermal conversion material comprises the following steps:
1) Mixing the raw materials: the weight percentage of the raw materials is as follows: 75% of SiC powder and Fe 2 O 3 12.5% of powder, mnO 2 12.5 percent of powder,weighing the raw materials, adding a proper amount of water or ethanol, performing ultrasonic oscillation and preliminary mixing, wherein the ultrasonic frequency is 40KHz, the power is 400W, and the dispersion time is 30min. And then ball milling and mixing are carried out for 2 hours, the rotation speed of ball milling is 30r/min, and raw powder is obtained after mixing is finished and drying is carried out.
(2) Granulating: adding PVA water solution or deionized water into the raw powder, wherein the addition amount is 5wt% of the total mass of the mixture; the concentration of the PVA aqueous solution was 5% by weight. Extruding the obtained green bricks with moderate dry humidity, sieving the extruded green bricks to keep the grain size below 25 meshes, and then rounding the green bricks by using a rounding machine; wherein the rotating speed of the rounding machine is 300r/min;
3) And (5) drying and forming: placing the green body in a drying oven at 70 ℃ for 2 hours;
4) Calcining: and paving the dried green body at the bottom of the ark crucible, adopting pressureless sintering, heating to 1350 ℃ according to 5 ℃/min, cooling to 500 ℃ according to 5 ℃/min after heat preservation for 11 hours, and then naturally cooling to normal temperature to obtain the solar photo-thermal conversion material.
Due to lack of Al 2 O 3 Powder as antioxidant and TiO 2 Powder-assisted sintering has poor sample compactness, and the thermal conductivity of the tested sample is only 3.66W/(m.K).
Claims (10)
1. The high-heat-conductivity wide-solar spectrum-response photo-thermal conversion material is characterized by comprising the following raw materials in percentage by mass: 65% -75% of SiC, al 2 O 3 10％～14％，TiO 2 2.5％～3.5％，Fe 2 O 3 2.5％～3.5％，MnO 2 10％～14％。
2. The high thermal conductivity broad solar spectrum response photothermal conversion material of claim 1 wherein said SiC, al 2 O 3 ，TiO 2 ，Fe 2 O 3 ，MnO 2 The particle size of the particles is 25 to 250 meshes.
3. A method for preparing the high-thermal-conductivity wide-solar-spectrum-response photo-thermal conversion material as claimed in claim 1, which is characterized by comprising the following steps:
(1) Mixing the raw materials according to the mass percentage to obtain a primary mixture;
(2) Ball milling is carried out on the primary mixture, and the mixture is dried after uniform mixing to obtain the mixture;
(3) Adding water or PVA water solution into the mixture, granulating, and drying to obtain a green body;
(4) And firing and molding the green body at 1250-1400 ℃ to obtain the high-heat-conductivity wide-solar spectrum-response photo-thermal conversion material.
4. The method for preparing a high thermal conductivity wide solar spectrum response photo-thermal conversion material according to claim 3, wherein in the step (4), the calcination process is as follows: heating to 1250-1400 ℃ at 5-10 ℃/min, preserving heat for 9-11 h, cooling to 500 ℃ or below at 2-5 ℃/min, and then naturally cooling to normal temperature to obtain the high-heat-conductivity wide-solar-spectrum-response photo-thermal conversion material.
5. The method for preparing a high-heat-conductivity wide-solar spectrum-response photo-thermal conversion material according to claim 3, wherein in the step (2), the preliminary mixture is mixed with water or ethanol to form a suspension before ball milling, and the suspension is subjected to ultrasonic vibration dispersion treatment, wherein the ultrasonic frequency is 20-40 KHz, the power is 300-400W, and the dispersion time is 30-60 min.
6. The method for preparing the high-heat-conductivity wide-solar spectrum-response photo-thermal conversion material according to claim 3, wherein in the step (2), the rotation speed of the ball milling is 20-30 r/min, and the ball milling is finished and then the material is dried.
7. The method for preparing a high thermal conductivity wide solar spectrum response photo-thermal conversion material according to claim 3, wherein in the step (3), PVA aqueous solution is added into the mixture, and the addition amount of the PVA aqueous solution is 5-10 wt% of the total mass of the mixture.
8. The method for producing a highly thermally conductive wide solar spectrum-responsive photothermal conversion material according to claim 3, wherein in the step (3), an aqueous PVA solution having a concentration of 2 to 5wt% is added to the mixture.
9. The method for preparing a high thermal conductivity wide solar spectrum response photo-thermal conversion material according to claim 3, wherein in the step (3), the granulating process comprises the steps of extrusion and rounding, wherein after extrusion, the particle size is kept below 25 meshes by sieving, and then the mixture is rounded by a rounding machine at a rotating speed of 200-300 r/min.
10. The method for producing a highly thermally conductive wide solar spectrum-responsive photothermal conversion material according to claim 3, wherein in the step (3), the drying condition is maintained at 50 to 70 ℃ for 2 to 5 hours.
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