CN109504353B - High specific heat capacity heat storage material and preparation method thereof - Google Patents

High specific heat capacity heat storage material and preparation method thereof Download PDF

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CN109504353B
CN109504353B CN201811582397.4A CN201811582397A CN109504353B CN 109504353 B CN109504353 B CN 109504353B CN 201811582397 A CN201811582397 A CN 201811582397A CN 109504353 B CN109504353 B CN 109504353B
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parts
mixing
aggregate
storage material
ilmenite
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阮克胜
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China Nonferrous Metals Group Jinlv Refractories Co ltd
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Abstract

The invention specifically relates to a high specific heat capacity heat storage material and a preparation method thereof, belongs to the technical field of heat energy storage materials, and aims to solve the technical problem of providing a high specific heat capacity heat storage material with high heat efficiency and high normal temperature compressive strength and a preparation method thereof, wherein the adopted technical scheme is as follows: a high specific heat capacity heat storage material comprises the following raw materials in parts by weight: 65-80 parts of shale aggregate, 5-15 parts of ilmenite aggregate, 16-28 parts of ilmenite powder, 6-15 parts of combined sintering agent and 3-10 parts of clear water; the combined sintering agent is formed by mixing and co-grinding barium carbonate, borocalcite and titanium steel rolled steel sheet; the preparation method of the high specific heat capacity heat storage material comprises the following steps: crushing raw materials, mixing the raw materials, forming, drying and sintering; compared with the traditional heat storage material, the heat storage material prepared by the invention has the advantages that the volume density is equivalent, the specific heat capacity is improved by 10%, the heat storage energy storage capacity of the heat storage material with the same volume is improved by 10%, and the thermal shock resistance is improved by 2 times.

Description

High specific heat capacity heat storage material and preparation method thereof
Technical Field
The invention relates to the technical field of thermal energy storage materials, in particular to a high specific heat capacity heat storage material and a preparation method thereof.
Background
Along with the rapid development of human society, the problems of energy consumption and environmental protection are increasingly highlighted, and a novel pollution-free electric heating mode of a heat accumulating type electric heater is one of the main modes of preferable winter heating. In order to encourage the use of electric heating, the national power supply department proposes an electricity utilization policy of peak clipping and valley filling time-sharing electricity price, and for this reason, the heat storage type electric heater can fully utilize low-cost valley electricity to heat a heat storage material and store heat for heating all day. The heat accumulating type electric heater is required to be made of a solid heat accumulating material with high specific heat capacity, has the characteristics of low carbon, environmental friendliness, no pollution, no noise, no coal ash, no peculiar smell, small occupied space and the like, and is required to have the characteristics of high specific heat capacity, high heat efficiency and the like. The heat storage materials for the electric heater have strict requirements, and have the characteristics of high specific heat capacity, good heat conductivity, thermal shock resistance, material fracture prevention, high heat efficiency, no pollution, no waste gas emission, rich raw material resources, low price and the like.
Disclosure of Invention
The invention overcomes the defects in the prior art and provides the heat storage material with high heat efficiency, high normal temperature compressive strength and high specific heat capacity and the preparation method thereof.
In order to solve the technical problems, the invention adopts the technical scheme that: a high specific heat capacity heat storage material comprises the following raw materials in parts by weight:
65-80 parts of shale aggregate, 5-15 parts of ilmenite aggregate, 16-28 parts of ilmenite powder, 6-15 parts of combined sintering agent and 3-10 parts of clear water.
The preferable weight parts of the raw materials are as follows: 68-74 parts of shale aggregate, 6-10 parts of ilmenite aggregate, 18-25 parts of ilmenite powder, 8-13 parts of combined sintering agent and 3-7 parts of clear water.
SiO in the shale aggregate2Is greater than or equal to 63 percent by weight, Al2O3Is greater than or equal to 18 percent by weight, Fe2O3The weight percentage content of (A) is more than or equal to 7 percent.
The density of the ilmenite aggregate is 4.4-5.0 g/cm3It has weak magnetism and high specific heat capacity.
TiO in the ilmenite powder2Is greater than or equal to 48 weight percent, Fe2O3The weight percentage content is more than or equal to 35 percent.
The combined sintering agent is prepared from barium carbonate, borocalcite and titanium steel rolled steel sheet in a weight ratio of 1: 11: 30 by mass ratio and then mixing and grinding.
A preparation method of a high specific heat capacity heat storage material comprises the following steps:
1) crushing raw materials:
coarsely crushing the shale aggregate by using a jaw crusher, finely crushing by using a hammer crusher, and screening by using a vibrating screen;
finely crushing the ilmenite aggregate by using a hammer crusher, screening by using a roller sieve, and discharging by adopting a sieve with the mesh number less than or equal to 6;
screening the ilmenite powder by using a rolling sieve, and adopting a sieve material with the mesh less than or equal to 20;
2) mixing raw materials:
adding the shale aggregate, the clear water, the ilmenite powder, the ilmenite aggregate and the combined sintering agent in parts by weight into a planetary mixing and rolling machine, mixing and rolling for 11-22 min, and ageing for 20-25 h at room temperature;
3) molding:
molding by adopting a 315-ton friction press;
4) drying and sintering:
and drying the mixture at the temperature of 115-120 ℃ for 25-28 h, then loading the dried mixture into a kiln, and firing the dried mixture at the temperature of 1000-1050 ℃ for 6-8 h to obtain the high specific heat capacity heat storage material.
The granularity and the granularity ratio of the shale aggregate in the step 1) are as follows:
20-25% of 10-20 meshes, 15-20% of 20-32 meshes, 20-25% of 32-150 meshes and 35-40% of not less than 150 meshes.
The specific operation method for mixing the raw materials in the step 2) comprises the following steps:
placing the shale aggregate and the ilmenite aggregate into a planetary mixing and rolling machine for mixing and rolling, mixing and rolling for 2-4 min, adding 1-6 parts of clear water, then adding ilmenite powder, mixing and rolling for 2-4 min, then adding 1-2 parts of clear water, adding a combined sintering agent, mixing and rolling for 1-4 min, then adding 1-2 parts of clear water, mixing and rolling for 6-10 min, and ageing for 20-25 h at room temperature.
In the raw material mixing step, 3-5 parts by weight of a dispersing agent is added when the combined sintering agent is added.
The performance detection results of one of the high specific heat capacity heat storage materials prepared by the invention are as follows:
Figure 313732DEST_PATH_IMAGE002
compared with the prior art, the invention has the following beneficial effects.
Firstly, the specific heat capacity of the high specific heat capacity heat storage material prepared by the invention is larger than 1170J/(Kg.C ℃), the high density heat storage material with the heat efficiency of 99 percent is realized, compared with the traditional heat storage material, the volume density is equivalent, the specific heat capacity is improved by 10 percent, namely the heat storage energy storage capacity of the heat storage material in the same body is improved by 10 percent.
Secondly, the thermal shock resistance times of the high specific heat capacity heat storage material prepared by the invention are greatly improved, and the thermal shock resistance is improved by 2 times compared with that of the traditional heat storage material.
Thirdly, the normal temperature compressive strength of the high specific heat capacity heat storage material prepared by the invention is more than 120MPa, the apparent porosity is 7-10%, and the volume density is more than 2.95g/cm3The heat conductivity coefficient is obviously increased, the charging time is reduced, the charging efficiency is obviously improved, and the heat storage at night can meet the requirement of heat supply all day long.
The heat storage material with high specific heat capacity is prepared by selecting particles and fine powder with different percentage contents, adopting an external combined sintering agent according to proper particle size gradation, and carrying out mixing grinding, ageing and high-pressure forming on raw materials, so that the heat storage capacity is remarkably increased, the thermal shock resistance is remarkably improved, and the heat storage material is green, environment-friendly, safe and reliable.
In the invention, the solid solution is formed by combining the sintering agent and the sintering object, so that the crystal lattice is distorted and activated, thereby reducing the sintering temperature, increasing the diffusion and sintering speed, forming vacancy type and interstitial type solid solutions and greatly improving the performance of the heat storage material.
Detailed Description
The present invention is further illustrated by the following specific examples.
Example 1
A high specific heat capacity heat storage material comprises the following raw materials in parts by weight:
75 parts of shale aggregate, 5 parts of ilmenite aggregate, 20 parts of ilmenite powder, 8 parts of combined sintering agent and 5 parts of clear water.
SiO in the shale aggregate2Is 63% by weight of Al2O318% by weight of Fe2O3The content of (B) is 7% by weight.
The density of the ilmenite aggregate is 4.4g/cm3It has weak magnetism and high specific heat capacity.
TiO in the ilmenite powder2Is 48% by weight, Fe2O3The weight percentage content is 35 percent.
The combined sintering agent is prepared from barium carbonate, borocalcite and titanium steel rolled steel sheet in a weight ratio of 1: 11: 30 by mass ratio and then mixing and grinding.
A preparation method of a high specific heat capacity heat storage material comprises the following steps:
1) crushing raw materials:
coarsely crushing the shale aggregate by using a jaw crusher, finely crushing by using a hammer crusher, and screening by using a vibrating screen;
finely crushing the ilmenite aggregate by using a hammer crusher, screening by using a roller sieve, and discharging by adopting a 6-mesh sieve;
screening the ilmenite powder by using a rolling sieve, and blanking by using a 20-mesh sieve;
2) mixing raw materials:
adding the shale aggregate, the clear water, the ilmenite powder, the ilmenite aggregate and the combined sintering agent in parts by weight into a planetary mixing and rolling machine, mixing and rolling for 15min, and ageing for 20h at room temperature;
3) molding:
molding by adopting a 315-ton friction press;
4) drying and sintering:
drying the mixture for 25 hours at the temperature of 115 ℃, then placing the mixture into a kiln, and firing the mixture for 6 hours at the temperature of 1000 ℃ to obtain the high specific heat capacity heat storage material.
The granularity and the granularity ratio of the shale aggregate in the step 1) are as follows:
20% of 10-20 meshes, 20% of 20-32 meshes and 40% of not less than 150 meshes.
The specific operation method for mixing the raw materials in the step 2) comprises the following steps:
placing the shale aggregate and the ilmenite aggregate into a planetary mixing and rolling machine for mixing and rolling, mixing and rolling for 3min, adding 3 parts of clear water, then adding ilmenite powder, mixing and rolling for 3min, then adding 1 part of clear water, adding a combined sintering agent, mixing and rolling for 2min, then adding 1 part of clear water, mixing and rolling for 7min, and ageing for 20h at room temperature.
In the raw material mixing step, when the composite sintering agent is added, 3 parts by weight of a dispersant is added.
The material performance detection result is as follows:
SiO262.06 percent by weight; al (Al)2O316.52 percent by weight; fe2O3The weight percentage content is 14.13%; normal temperature compressive strength 116 MPa; apparent porosity is 9.3%; bulk density 2.87g/cm3(ii) a The specific heat capacity is 1.18KJ/Kg DEG C; resisting thermal shock, water cooling at 1100 deg.C for 16 times; the heat conductivity coefficient is 2.96W/m.K; the thermal expansion rate at 1200 ℃ is 0.89%.
Example 2
A high specific heat capacity heat storage material comprises the following raw materials in parts by weight:
70 parts of shale aggregate, 10 parts of ilmenite aggregate, 20 parts of ilmenite powder, 8 parts of combined sintering agent and 5 parts of clear water.
SiO in the shale aggregate2Is 64 percent by weight of Al2O319% by weight of Fe2O3The content of (B) is 9% by weight.
The density of the ilmenite aggregate is 5.0g/cm3It has weak magnetism and high specific heat capacity.
TiO in the ilmenite powder249% by weight of Fe2O3The weight percentage content is 37 percent.
The combined sintering agent is prepared from barium carbonate, borocalcite and titanium steel rolled steel sheet in a weight ratio of 1: 11: 30 by mass ratio and then mixing and grinding.
A preparation method of a high specific heat capacity heat storage material comprises the following steps:
1) crushing raw materials:
coarsely crushing the shale aggregate by using a jaw crusher, finely crushing by using a hammer crusher, and screening by using a vibrating screen;
finely crushing the ilmenite aggregate by using a hammer crusher, screening by using a roller sieve, and discharging by adopting a 6-mesh sieve;
screening the ilmenite powder by using a rolling sieve, and blanking by using a 20-mesh sieve;
2) mixing raw materials:
adding the shale aggregate, the clear water, the ilmenite powder, the ilmenite aggregate and the combined sintering agent in parts by weight into a planetary mixing and rolling machine, mixing and rolling for 17min, and ageing for 25h at room temperature;
3) molding:
molding by adopting a 315-ton friction press;
4) drying and sintering:
and (3) drying for 28h at 120 ℃, then placing in a kiln, and firing for 7h at 1035 ℃ to obtain the high specific heat capacity heat storage material.
The granularity and the granularity ratio of the shale aggregate in the step 1) are as follows:
25% of 10-20 meshes, 15% of 20-32 meshes, 25% of 20-32 meshes and 35% of not less than 150 meshes.
The specific operation method for mixing the raw materials in the step 2) comprises the following steps:
placing the shale aggregate and the ilmenite aggregate into a planetary mixed rolling machine for mixed rolling, mixing and rolling for 2min, adding 3 parts of clear water, then adding ilmenite powder, mixing and rolling for 4min, then adding 1 part of clear water, adding a combined sintering agent, mixing and rolling for 1min, then adding 1 part of clear water, mixing and rolling for 10min, and ageing for 25h at room temperature.
In the raw material mixing step, 4 parts by weight of a dispersant was added when the composite sintering agent was added.
The material performance detection result is as follows:
SiO2the weight percentage content is 58.76%; al (Al)2O3The weight percentage content is 15.98 percent; fe2O3The weight percentage content is 15.85 percent; the normal temperature compressive strength is 146 MPa; apparent porosity 8.7%; bulk density 2.99g/cm3(ii) a The specific heat capacity is 1.29KJ/Kg DEG C; resisting thermal shock, water cooling at 1100 deg.C for 19 times; the thermal conductivity coefficient is 3.05W/m.K; the thermal expansion rate at 1200 ℃ is 0.87 percent.
Example 3
A high specific heat capacity heat storage material comprises the following raw materials in parts by weight:
65 parts of shale aggregate, 15 parts of ilmenite aggregate, 20 parts of ilmenite powder, 8 parts of combined sintering agent and 5 parts of clear water.
SiO in the shale aggregate265% by weight of Al2O320% by weight of Fe2O3The content of (B) is 8% by weight.
The density of the ilmenite aggregate is 4.6g/cm3It has weak magnetism and high specific heat capacity.
TiO in the ilmenite powder249% by weight of Fe2O3The weight percentage content is 36 percent.
The combined sintering agent is prepared from barium carbonate, borocalcite and titanium steel rolled steel sheet in a weight ratio of 1: 11: 30 by mass ratio and then mixing and grinding.
A preparation method of a high specific heat capacity heat storage material comprises the following steps:
1) crushing raw materials:
coarsely crushing the shale aggregate by using a jaw crusher, finely crushing by using a hammer crusher, and screening by using a vibrating screen;
finely crushing the ilmenite aggregate by using a hammer crusher, screening by using a roller sieve, and discharging by adopting a 6-mesh sieve;
screening the ilmenite powder by using a rolling sieve, and blanking by using a 20-mesh sieve;
2) mixing raw materials:
adding the shale aggregate, the clear water, the ilmenite powder, the ilmenite aggregate and the combined sintering agent in parts by weight into a planetary mixing and rolling machine, mixing and rolling for 15min, and ageing for 24h at room temperature;
3) molding:
molding by adopting a 315-ton friction press;
4) drying and sintering:
drying for 26h at 118 ℃, then placing in a kiln, and firing for 7h at 1040 ℃ to obtain the high specific heat capacity heat storage material.
The granularity and the granularity ratio of the shale aggregate in the step 1) are as follows:
22% of 10-20 meshes, 18% of 20-32 meshes, 23% of 20-32 meshes and 37% of not less than 150 meshes.
The specific operation method for mixing the raw materials in the step 2) comprises the following steps:
placing the shale aggregate and the ilmenite aggregate into a planetary mixing and rolling machine for mixing and rolling, mixing and rolling for 3min, adding 3 parts of clear water, then adding ilmenite powder, mixing and rolling for 3min, then adding 1 part of clear water, adding a combined sintering agent, mixing and rolling for 2min, then adding 1 part of clear water, mixing and rolling for 7min, and ageing for 24h at room temperature.
In the raw material mixing step, when the composite sintering agent is added, 3 parts by weight of a dispersant is added.
The material performance detection result is as follows:
SiO255.16 percent by weight; al (Al)2O3The weight percentage content is 15.14 percent; fe2O3The weight percentage content is 17.61%; the normal temperature compressive strength is 126 MPa; apparent porosity is 10.6%; bulk density 3.01g/cm3(ii) a Specific heat capacity of 1.26KJ/Kg per DEG C; resisting thermal shock, water cooling at 1100 deg.C for 19 times; the thermal conductivity coefficient is 3.05W/m.K; the thermal expansion rate at 1200 ℃ is 0.86 percent.
Example 4
A high specific heat capacity heat storage material comprises the following raw materials in parts by weight:
65 parts of shale aggregate, 5 parts of ilmenite aggregate, 16 parts of ilmenite powder, 6 parts of combined sintering agent and 3 parts of clear water.
SiO in the shale aggregate265% by weight of Al2O320% by weight of Fe2O3The content of (B) is 8% by weight.
The density of the ilmenite aggregate is 4.7g/cm3It has weak magnetism and high specific heat capacity.
TiO in the ilmenite powder249% by weight of Fe2O3The weight percentage content is 36 percent.
The combined sintering agent is prepared from barium carbonate, borocalcite and titanium steel rolled steel sheet in a weight ratio of 1: 11: 30 by mass ratio and then mixing and grinding.
A preparation method of a high specific heat capacity heat storage material comprises the following steps:
1) crushing raw materials:
coarsely crushing the shale aggregate by using a jaw crusher, finely crushing by using a hammer crusher, and screening by using a vibrating screen;
finely crushing the ilmenite aggregate by using a hammer crusher, screening by using a roller sieve, and discharging by adopting a 6-mesh sieve;
screening the ilmenite powder by using a rolling sieve, and blanking by using a 20-mesh sieve;
2) mixing raw materials:
adding the shale aggregate, the clear water, the ilmenite powder, the ilmenite aggregate and the combined sintering agent in parts by weight into a planetary mixing and rolling machine, mixing and rolling for 11min, and ageing for 24h at room temperature;
3) molding:
molding by adopting a 315-ton friction press;
4) drying and sintering:
drying at 119 ℃ for 25h, then loading into a kiln, and firing at 1040 ℃ for 8h to obtain the high specific heat capacity heat storage material.
The granularity and the granularity ratio of the shale aggregate in the step 1) are as follows:
22% of 10-20 meshes, 18% of 20-32 meshes, 23% of 20-32 meshes and 37% of not less than 150 meshes.
The specific operation method for mixing the raw materials in the step 2) comprises the following steps:
placing the shale aggregate and the ilmenite aggregate into a planetary mixing and rolling machine for mixing and rolling, mixing and rolling for 2min, adding 1 part of clear water, then adding ilmenite powder, mixing and rolling for 2min, then adding 1 part of clear water, adding a combined sintering agent, mixing and rolling for 1min, then adding 1 part of clear water, mixing and rolling for 6min, and ageing for 24h at room temperature.
In the raw material mixing step, when the composite sintering agent is added, 3 parts by weight of a dispersant is added.
The material performance detection result is as follows:
SiO255.18 percent by weight; al (Al)2O3The weight percentage content is 15.32 percent; fe2O3The weight percentage content is 14.19 percent; the normal temperature compressive strength is 129 MPa; apparent porosity 8.9%; bulk density 3.03g/cm3(ii) a The specific heat capacity is 1.20KJ/Kg DEG C; resisting thermal shock, cooling with water at 1100 deg.C for 17 times; the heat conductivity coefficient is 3.01W/m.K; the thermal expansion rate at 1200 ℃ is 0.87 percent.
Example 5
A high specific heat capacity heat storage material comprises the following raw materials in parts by weight:
80 parts of shale aggregate, 15 parts of ilmenite aggregate, 28 parts of ilmenite powder, 15 parts of combined sintering agent and 10 parts of clear water.
SiO in the shale aggregate2Is 64 percent by weight of Al2O319% by weight of Fe2O3The content of (B) is 9% by weight.
The density of the ilmenite aggregate is 5.0g/cm3It has weak magnetism and high specific heat capacity.
TiO in the ilmenite powder249% by weight of Fe2O3The weight percentage content is 37 percent.
The combined sintering agent is prepared from barium carbonate, borocalcite and titanium steel rolled steel sheet in a weight ratio of 1: 11: 30 by mass ratio and then mixing and grinding.
A preparation method of a high specific heat capacity heat storage material comprises the following steps:
1) crushing raw materials:
coarsely crushing the shale aggregate by using a jaw crusher, finely crushing by using a hammer crusher, and screening by using a vibrating screen;
finely crushing the ilmenite aggregate by using a hammer crusher, screening by using a roller sieve, and discharging by adopting a 6-mesh sieve;
screening the ilmenite powder by using a rolling sieve, and blanking by using a 20-mesh sieve;
2) mixing raw materials:
adding the shale aggregate, the clear water, the ilmenite powder, the ilmenite aggregate and the combined sintering agent in parts by weight into a planetary mixing and rolling machine, mixing and rolling for 17min, and ageing for 25h at room temperature;
3) molding:
molding by adopting a 315-ton friction press;
4) drying and sintering:
and (3) drying for 28h at 120 ℃, then placing in a kiln, and firing for 7h at 1035 ℃ to obtain the high specific heat capacity heat storage material.
The granularity and the granularity ratio of the shale aggregate in the step 1) are as follows:
25% of 10-20 meshes, 15% of 20-32 meshes, 25% of 20-32 meshes and 35% of not less than 150 meshes.
The specific operation method for mixing the raw materials in the step 2) comprises the following steps:
placing the shale aggregate and the ilmenite aggregate into a planetary mixing and rolling machine for mixing and rolling, mixing and rolling for 2min, adding 6 parts of clear water, then adding ilmenite powder, mixing and rolling for 4min, then adding 2 parts of clear water, adding a combined sintering agent, mixing and rolling for 1min, then adding 2 parts of clear water, mixing and rolling for 10min, and ageing for 25h at room temperature.
In the raw material mixing step, 4 parts by weight of a dispersant was added when the composite sintering agent was added.
The material performance detection result is as follows:
SiO256.43 percent by weight; al (Al)2O3The weight percentage content is 15.78%; fe2O3The weight percentage content is 15.34 percent; the normal temperature compressive strength is 120 MPa; apparent porosity is 9.1%; bulk density 2.93g/cm3(ii) a The specific heat capacity is 1.23KJ/Kg DEG C; resisting thermal shock, water cooling at 1100 deg.C for 18 times; the thermal conductivity coefficient is 2.97W/m.K; the thermal expansion rate at 1200 ℃ is 0.86 percent.
Example 6
A high specific heat capacity heat storage material comprises the following raw materials in parts by weight:
68 parts of shale aggregate, 6 parts of ilmenite aggregate, 18 parts of ilmenite powder, 8 parts of combined sintering agent and 5 parts of clear water.
SiO in the shale aggregate2Is 63% by weight of Al2O318% by weight of Fe2O3The content of (B) is 7% by weight.
The density of the ilmenite aggregate is 4.8g/cm3It has weak magnetism and high specific heat capacity.
TiO in the ilmenite powder2Is 48% by weight, Fe2O3The weight percentage content is 35 percent.
The combined sintering agent is prepared from barium carbonate, borocalcite and titanium steel rolled steel sheet in a weight ratio of 1: 11: 30 by mass ratio and then mixing and grinding.
A preparation method of a high specific heat capacity heat storage material comprises the following steps:
1) crushing raw materials:
coarsely crushing the shale aggregate by using a jaw crusher, finely crushing by using a hammer crusher, and screening by using a vibrating screen;
finely crushing the ilmenite aggregate by using a hammer crusher, screening by using a roller sieve, and discharging by adopting a 6-mesh sieve;
screening the ilmenite powder by using a rolling sieve, and blanking by using a 20-mesh sieve;
2) mixing raw materials:
adding the shale aggregate, the clear water, the ilmenite powder, the ilmenite aggregate and the combined sintering agent in parts by weight into a planetary mixing and rolling machine, mixing and rolling for 22min, and ageing for 23h at room temperature;
3) molding:
molding by adopting a 315-ton friction press;
4) drying and sintering:
and (3) drying the mixture for 25 hours at the temperature of 115 ℃, then placing the mixture into a kiln, and firing the mixture for 7 hours at the temperature of 1030 ℃ to obtain the high specific heat capacity heat storage material.
The granularity and the granularity ratio of the shale aggregate in the step 1) are as follows:
20% of 10-20 meshes, 20% of 20-32 meshes and 40% of not less than 150 meshes.
The specific operation method for mixing the raw materials in the step 2) comprises the following steps:
placing the shale aggregate and the ilmenite aggregate into a planetary mixing and rolling machine for mixing and rolling for 4min, adding 3 parts of clear water, then adding ilmenite powder, mixing and rolling for 4min, then adding 1 part of clear water, adding a combined sintering agent, mixing and rolling for 4min, then adding 1 part of clear water, mixing and rolling for 10min, and ageing for 23h at room temperature.
In the raw material mixing step, when the composite sintering agent is added, 3 parts by weight of a dispersant is added.
The material performance detection result is as follows:
SiO259.57 percent by weight; al (Al)2O3The weight percentage content is 16.31 percent; fe2O3The weight percentage content is 16.58 percent; the normal temperature compressive strength is 131 MPa; apparent porosity is 9.9%; bulk density 2.91g/cm3(ii) a The specific heat capacity is 1.27KJ/Kg DEG C; resisting thermal shock, water cooling at 1100 deg.C for 18 times; the heat conductivity coefficient is 2.98W/m.K; the thermal expansion rate at 1200 ℃ is 0.89%.
Example 7
A high specific heat capacity heat storage material comprises the following raw materials in parts by weight:
74 parts of shale aggregate, 10 parts of ilmenite aggregate, 25 parts of ilmenite powder, 13 parts of combined sintering agent and 7 parts of clear water.
SiO in the shale aggregate265% by weight of Al2O320% by weight of Fe2O3The content of (B) is 8% by weight.
The titaniumThe density of the iron ore aggregate is 4.6g/cm3It has weak magnetism and high specific heat capacity.
TiO in the ilmenite powder249% by weight of Fe2O3The weight percentage content is 36 percent.
The combined sintering agent is prepared from barium carbonate, borocalcite and titanium steel rolled steel sheet in a weight ratio of 1: 11: 30 by mass ratio and then mixing and grinding.
A preparation method of a high specific heat capacity heat storage material comprises the following steps:
1) crushing raw materials:
coarsely crushing the shale aggregate by using a jaw crusher, finely crushing by using a hammer crusher, and screening by using a vibrating screen;
finely crushing the ilmenite aggregate by using a hammer crusher, screening by using a roller sieve, and discharging by adopting a 6-mesh sieve;
screening the ilmenite powder by using a rolling sieve, and blanking by using a 20-mesh sieve;
2) mixing raw materials:
adding the shale aggregate, the clear water, the ilmenite powder, the ilmenite aggregate and the combined sintering agent in parts by weight into a planetary mixing and rolling machine, mixing and rolling for 17min, and ageing for 24h at room temperature;
3) molding:
molding by adopting a 315-ton friction press;
4) drying and sintering:
drying for 26h at 118 ℃, then placing in a kiln, and firing for 7h at 1040 ℃ to obtain the high specific heat capacity heat storage material.
The granularity and the granularity ratio of the shale aggregate in the step 1) are as follows:
22% of 10-20 meshes, 18% of 20-32 meshes, 23% of 20-32 meshes and 37% of not less than 150 meshes.
The specific operation method for mixing the raw materials in the step 2) comprises the following steps:
placing the shale aggregate and the ilmenite aggregate into a planetary mixing and rolling machine for mixing and rolling, mixing and rolling for 3min, adding 4 parts of clear water, then adding ilmenite powder, mixing and rolling for 3min, then adding 2 parts of clear water, adding a combined sintering agent, mixing and rolling for 3min, then adding 1 part of clear water, mixing and rolling for 8min, and ageing for 24h at room temperature.
In the raw material mixing step, 4 parts by weight of a dispersant was added when the composite sintering agent was added.
The material performance detection result is as follows:
SiO2the weight percentage content is 60.88%; al (Al)2O3The weight percentage content is 16.48 percent; fe2O3The weight percentage content is 17.21%; the normal temperature compressive strength is 142 MPa; apparent porosity is 10.3%; bulk density 2.88g/cm3(ii) a The specific heat capacity is 1.28KJ/Kg DEG C; resisting thermal shock, water cooling at 1100 deg.C for 19 times; the heat conductivity coefficient is 2.99W/m.K; the thermal expansion rate at 1200 ℃ is 0.87 percent.
The above embodiments are merely illustrative of the principles of the present invention and its effects, and do not limit the present invention. It will be apparent to those skilled in the art that modifications and improvements can be made to the above-described embodiments without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications or changes be made by those skilled in the art without departing from the spirit and technical spirit of the present invention, and be covered by the claims of the present invention.

Claims (6)

1. The preparation method of the high specific heat capacity heat storage material is characterized by comprising the following raw materials in parts by weight:
65-80 parts of shale aggregate, 5-15 parts of ilmenite aggregate, 16-28 parts of ilmenite powder, 6-15 parts of combined sintering agent and 3-10 parts of clear water;
SiO in the shale aggregate2Is greater than or equal to 63 percent by weight, Al2O3Is greater than or equal to 18 percent by weight, Fe2O3The weight percentage content of (A) is more than or equal to 7 percent;
the density of the ilmenite aggregate is 4.4-5.0 g/cm3
TiO in the ilmenite powder2Is greater than or equal to 48 weight percent, Fe2O3The weight percentage content is more than or equal to 35 percent;
the combined sintering agent is prepared from barium carbonate, borocalcite and titanium steel rolled steel sheet in a weight ratio of 1: 11: 30 by mass ratio and co-grinding;
the preparation method of the high specific heat capacity heat storage material comprises the following steps:
1) crushing raw materials:
coarsely crushing the shale aggregate by using a jaw crusher, finely crushing by using a hammer crusher, and screening by using a vibrating screen;
finely crushing the ilmenite aggregate by using a hammer crusher, screening by using a roller sieve, and discharging by adopting a sieve with the mesh number less than or equal to 6;
screening the ilmenite powder by using a rolling sieve, and adopting a sieve material with the mesh less than or equal to 20;
2) mixing raw materials:
adding the shale aggregate, the clear water, the ilmenite powder, the ilmenite aggregate and the combined sintering agent in parts by weight into a planetary mixing and rolling machine, mixing and rolling for 11-22 min, and ageing for 20-25 h at room temperature;
3) molding:
molding by adopting a 315-ton friction press;
4) drying and sintering:
and drying the mixture at the temperature of 115-120 ℃ for 25-28 h, then loading the dried mixture into a kiln, and firing the dried mixture at the temperature of 1000-1050 ℃ for 6-8 h to obtain the high specific heat capacity heat storage material.
2. The preparation method of the high specific heat capacity thermal storage material according to claim 1, wherein the granularity and the granularity ratio of the shale aggregate in the step 1) are as follows:
20-25% of 10-20 meshes, 15-20% of 20-32 meshes, 20-25% of 32-150 meshes and 35-40% of not less than 150 meshes.
3. The preparation method of the high specific heat capacity thermal storage material according to claim 2, characterized in that the specific operation method of the step 2) raw material mixing is as follows:
placing the shale aggregate and the ilmenite aggregate into a planetary mixing and rolling machine for mixing and rolling, mixing and rolling for 2-4 min, adding 1-6 parts of clear water, then adding ilmenite powder, mixing and rolling for 2-4 min, then adding 1-2 parts of clear water, adding a combined sintering agent, mixing and rolling for 1-4 min, then adding 1-2 parts of clear water, mixing and rolling for 6-10 min, and ageing for 20-25 h at room temperature.
4. The method for preparing a high specific heat capacity thermal storage material according to claim 3, wherein in the raw material mixing step, 3 to 5 parts by weight of a dispersant is added when the combined sintering agent is added.
5. A high specific heat capacity thermal storage material produced by the method for producing a high specific heat capacity thermal storage material according to any one of claims 1 to 4.
6. The high specific heat capacity thermal storage material according to claim 5, characterized in that the high specific heat capacity thermal storage material comprises the following raw materials in parts by weight: 68-74 parts of shale aggregate, 6-10 parts of ilmenite aggregate, 18-25 parts of ilmenite powder, 8-13 parts of combined sintering agent and 3-7 parts of clear water.
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