CN116178032A - Heat accumulating brick and preparation method and application thereof - Google Patents
Heat accumulating brick and preparation method and application thereof Download PDFInfo
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- CN116178032A CN116178032A CN202211704300.9A CN202211704300A CN116178032A CN 116178032 A CN116178032 A CN 116178032A CN 202211704300 A CN202211704300 A CN 202211704300A CN 116178032 A CN116178032 A CN 116178032A
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- pyrophyllite
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- tailings
- brick
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- 239000011449 brick Substances 0.000 title claims abstract description 43
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 229910052903 pyrophyllite Inorganic materials 0.000 claims abstract description 36
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000002699 waste material Substances 0.000 claims abstract description 31
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 17
- 239000002244 precipitate Substances 0.000 claims abstract description 8
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 239000002245 particle Substances 0.000 claims description 30
- 239000007788 liquid Substances 0.000 claims description 27
- 238000005338 heat storage Methods 0.000 claims description 22
- 239000001095 magnesium carbonate Substances 0.000 claims description 11
- 235000014380 magnesium carbonate Nutrition 0.000 claims description 11
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 11
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 10
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 7
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- PQUCIEFHOVEZAU-UHFFFAOYSA-N Diammonium sulfite Chemical compound [NH4+].[NH4+].[O-]S([O-])=O PQUCIEFHOVEZAU-UHFFFAOYSA-N 0.000 claims description 6
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 239000013049 sediment Substances 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 238000005245 sintering Methods 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 3
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000010304 firing Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 239000011574 phosphorus Substances 0.000 claims description 3
- 229910052700 potassium Inorganic materials 0.000 claims description 3
- 239000011591 potassium Substances 0.000 claims description 3
- 238000004537 pulping Methods 0.000 claims description 3
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 2
- 229910001649 dickite Inorganic materials 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims description 2
- 238000003860 storage Methods 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 6
- 238000009825 accumulation Methods 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 239000011232 storage material Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000005995 Aluminium silicate Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 235000012211 aluminium silicate Nutrition 0.000 description 2
- 229910001570 bauxite Inorganic materials 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000010433 feldspar Substances 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 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 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000454 talc Substances 0.000 description 2
- 235000012222 talc Nutrition 0.000 description 2
- 229910052623 talc Inorganic materials 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 229910052878 cordierite Inorganic materials 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
- C04B33/132—Waste materials; Refuse; Residues
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
- C04B33/132—Waste materials; Refuse; Residues
- C04B33/1321—Waste slurries, e.g. harbour sludge, industrial muds
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
- C04B33/132—Waste materials; Refuse; Residues
- C04B33/1328—Waste materials; Refuse; Residues without additional clay
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D11/00—Central heating systems using heat accumulated in storage masses
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0056—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using solid heat storage material
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/74—Physical characteristics
- C04B2235/77—Density
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
Abstract
The invention discloses a heat accumulating brick and a preparation method and application thereof, and belongs to the field of heat accumulating materials. The heat accumulating brick of the present invention contains pyrophyllite tailing 73-87 weight portions, magnesia 10-24 weight portions and pulp effluent precipitate 1-3 weight portions. The invention adopts pyrophyllite waste, namely pyrophyllite tailings, as the raw material, has low price, effectively utilizes pyrophyllite resources, avoids a great deal of accumulation of the pyrophyllite tailings, and improves the environment; meanwhile, the preparation process is simple, and the heat accumulating material produced by using the pyrophyllite tailings has strong heat accumulating capacity, the compressive strength can reach 45-70 Mpa, and the volume density can reach 2.0-2.5 g/cm 3 。
Description
Technical Field
The invention belongs to the field of heat storage materials, and particularly relates to a heat storage brick and a preparation method and application thereof.
Background
Along with the development of economy, the energy shortage and the environmental problem have become the focus of global common attention, and energy conservation and environmental protection are also attracting more and more attention, and the heat storage technology is one of the important means for solving the energy crisis and realizing industrial energy conservation. The heat accumulating combustion technology can be used for recovering the waste heat of high-temperature flue gas generated by a blast furnace, a hot blast stove, a coke oven and the like, the heat efficiency of the furnace is obviously improved after the waste heat of the flue gas is recovered by using a heat accumulating chamber, and the emission of pollutants can be reduced; the heat storage material is arranged in the heating equipment to play roles of rapid heat absorption, long heat storage time and slow heat release, so that the aim of saving energy is fulfilled; the energy is stored by the heat storage material in the electricity valley period, and the heat is released and heated in the electricity peak period, so that the operation pressure of the power grid can be relieved. The solid oxide heat accumulator has high volume density, high heat accumulating capacity and great development space.
The materials commonly used for the solid heat accumulator are siliceous, high alumina, mafic, corundum, cordierite, magnesia, mullite and the like. The current research is mainly focused on the structure and the shape of the heat exchanger, so that the surface area of the heat exchanger is increased, and the heat exchange capacity is enhanced. Such as honeycomb ceramic heat reservoirs, porous lattice bricks, porous rectangular solids, and the like. In addition, there is a heat accumulator with surface coated with radiation paint to raise the heat absorbing and releasing capacity of the heat accumulator surface and to leave hot fume or other heat as fast as possible. These materials and structures have been embodied on conventional thermal masses.
Patent CN1316399, the heat accumulating brick comprises MgO in percentage by mass: 86-90%, fe 2 0 3 ：7～9％，Al 2 O 3 ：0.2～1.0％，SiO 2 :1 to 2 percent of CaO:1 to 5 percent. The heat accumulating brick has high temperature resistance and high heat accumulating effect. However, as the price of magnesite increases, the price of the product reaches a point where it is unacceptable in the market.
The patent CN 102603337A takes 55 to 65 percent of magnesite tailings and 35 to 45 percent of iron ore powder as main raw materials, and the magnesite brick is prepared by proportioning, mixing, balling, sintering and the like. This patent was an advance over CN1316399, cost-effective and resource-efficient. But its manufacturing process is complicated and needs to be simplified.
The patent CN1316399 is formed by steel slag, talcum, feldspar, kaolin and bauxite, wherein the mass percentage of the steel slag, the talcum, the feldspar, the kaolin and the bauxite is 64% -65%:5% -6%:9% -10%:5% -6%:15% -16%, the heat storage brick can realize low-cost heat storage, but the strength is lower and is difficult to meet the requirements.
Disclosure of Invention
The invention solves the technical problems of complex preparation process, low strength, poor heat storage capability and high heat storage cost of the heat storage brick in the prior art,
in order to solve the technical problems, the first aspect of the present invention provides the following technical solutions:
the heat accumulating brick contains pyrophyllite tailing 73-87 weight portions, magnesia 10-24 weight portions and pulp waste liquid precipitate 1-3 weight portions.
As one embodiment of the invention, the heat accumulating brick comprises 73-78 parts by weight of pyrophyllite tailings, 19-24 parts by weight of magnesia and 1-3 parts by weight of pulp waste liquid sediment;
the compressive strength of the heat accumulating brick is 45-70 Mpa, and the volume density is 2.0-2.5 g/cm 3 。
As one embodiment of the invention, the pyrophyllite tailings comprise the chemical components of SiO in percentage by mass 2 63％～67％，Al 2 O 3 24％～28％，TiO 2 0.5％～1.5％，Na 2 O O.05％～0.10％，P 2 O 5 0.2％～0.3％，SO 3 4.7％～5.3％，K 2 O 0.2％～0.3％，CaO O.8％～1.1％，Fe 2 O 3 0.95％～1.10％。
As one embodiment of the invention, the pyrophyllite tailings are screened into three types of particles with the particle sizes of 0-0.08 mm, 0.08-1 mm and 1-3 mm; wherein the particle size is 0-0.08 mm, the weight percentage is 25-45%, the particle size is 0.08-1 mm, the weight percentage is 10-20%, the particle size is 1-3 mm, and the weight percentage is 40-60%.
As one embodiment of the invention, the magnesia comprises the chemical components of SiO by mass percent 2 0.2％～0.3％，Al 2 O 3 0.5％～1％，TiO 2 0.2％～0.7％，CaO 0.8％～1.5％，Fe 2 O 3 0.2％～0.5％，MgO 96％～98％；
The granularity of the magnesite is 1-3 mm.
As an embodiment of the invention, the pulp waste liquid is from an ammonium sulfite pulping waste liquid.
As one embodiment of the invention, the pulp waste liquid contains 10.4 to 16.4 percent of solid, 0.31 to 1.32 percent of ash, 3.45 to 5.93 percent of active organic carbon, 0.4 to 2.8 percent of residual ammonium sulfite, 1.01 to 1.87 percent of total nitrogen (N), 0.00236 to 0.00968 percent of total phosphorus (P), 0.29 to 0.59 percent of total potassium (K), 70 to 85 percent of water, 6 to 7 percent of Ph value and 1.044 to 1.076g/L of density.
In a second aspect, the present invention provides a method for preparing a heat accumulating brick according to the first aspect, the method comprising:
s1: weighing all raw materials according to 73-87 parts by weight of pyrophyllite tailings, 10-24 parts by weight of magnesia and 1-3 parts by weight of pulp waste liquid sediment, and mixing in a mixer according to a certain feeding sequence to obtain a mixture;
s2: placing the mixture into a press machine to press and form under the pressure of 150-250 MPa to obtain a blank;
s3: drying the green body in air for 24-48 h, and then drying the green body in an oven at 100-130 ℃ for 24-48 h to obtain a brick blank;
s4: and (3) putting the green bricks into a firing kiln, sintering for 2-4 hours at 1050-1200 ℃, and cooling to obtain the heat accumulating bricks.
In step S1, preferably, the raw materials are weighed according to 73-78 parts by weight of the dickite tailings, 19-24 parts by weight of the magnesite and 1-3 parts by weight of the pulp waste liquid sediment, and mixed in a mixer according to a certain feeding sequence to obtain a mixture;
the feeding sequence is as follows: pyrophyllite tailing particles with the granularity of 1-3 mm and 0.08-1 mm, and the feeding time is 3-5 min; pulp waste liquid is fed for 3-5 min; the pyrophyllite tailing particles with the diameter of 0-0.08 mm are fed for 3-5 min; the magnesia particles are added for 5-10 min;
the mixing time is 15-25 min.
The third aspect of the invention provides the heat storage brick of the first aspect of the invention, or the application of the heat storage brick prepared by the method of the second aspect of the invention in industrial heating.
The technical scheme provided by the invention has at least the beneficial effects that:
the waste pyrophyllite tailings after the pyrophyllite tailings are used as the raw material, so that the cost is low, the pyrophyllite resources are effectively utilized, a large amount of accumulation of the pyrophyllite tailings is avoided, and the environment is improved; meanwhile, the preparation process is simple, and the heat accumulating material produced by using the pyrophyllite tailings has strong heat accumulating capacity, the compressive strength can reach 45-70 Mpa, and the volume density can reach 2.0-2.5 g/cm 3 。
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic view of a heat storage brick according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved more apparent, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
Example 1
The heat accumulating brick is prepared by the following steps:
s1: taking 37 mass percent of pyrophyllite tailing particles with the granularity of 1-3 mm and 11 mass percent of the granularity of 0.08-1 mm, and feeding for 5min; taking pulp waste liquid with mass fraction of 3% of pulp waste liquid precipitate, and feeding for 5min; taking 25 mass percent of pyrophyllite tailing particles with the granularity of 0-0.08 mm, and feeding for 5min; taking 24% by mass of magnesite grains, and feeding for 5min; mixing the materials in a mixer for 5min to obtain a mixture; the pulp waste liquid sediment is solid components in the pulp waste liquid contained in the prepared heat storage brick;
s2: placing the mixture obtained in the step S1 into a press machine, and performing compression molding under the pressure of 200Mpa to obtain a blank;
s3: drying the green body in air for 24 hours, and then drying the green body in an oven at 110 ℃ for 24 hours to obtain a brick blank;
s4: and (3) putting the green bricks into a firing kiln, sintering for 2 hours at 1150 ℃, and cooling to obtain the heat accumulating bricks.
In the example, the pyrophyllite tailings comprise the chemical components of SiO in percentage by mass 2 65.25％，Al 2 O 3 26.18％，TiO 2 0.97％，Na 2 O 0.08％，P 2 O 5 0.24％，SO 3 5.03％，K 2 O 0.22％，CaO 1.02％，Fe 2 O 3 1.01％；
The chemical composition of the magnesite is SiO in percentage by mass 2 0.28％，Al 2 O 3 0.82％，TiO 2 0.55％，CaO 1.02％，Fe 2 O 3 0.31％，MgO 97.02％；
The paper pulp waste liquid is from waste liquid of pulping by an ammonium sulfite method; the pulp waste liquid contains 16.4% of solid matters, 1.32% of ash, 5.93% of active organic carbon, 2.80% of residual ammonium sulfite, 1.87% of total nitrogen (N), 0.01% of total phosphorus (P), 0.58% of total potassium (K), the balance of 71.1% of water, 6.5 of Ph value and 1.062g/L of density.
Example 2
The heat accumulating brick was prepared by the method described in example 1, except that:
in the step S1, 39 mass percent of pyrophyllite tailing particles with the granularity of 1-3 mm and 12 mass percent of pyrophyllite tailing particles with the granularity of 0.08-1 mm are taken and fed for 5min; taking pulp waste liquid with mass fraction of 3% of pulp waste liquid precipitate, and feeding for 5min; taking 27 mass percent of pyrophyllite tailing particles with the granularity of 0-0.08 mm, and feeding for 5min; taking the magnesite grains with the mass percentage of 19%, and feeding for 5min.
Example 3
The heat accumulating brick was prepared by the method described in example 1, except that:
in the step S1, taking 41 mass percent of pyrophyllite tailing particles with the granularity of 1-3 mm and 13 mass percent of pyrophyllite tailing particles with the granularity of 0.08-1 mm, and feeding for 5min; taking pulp waste liquid with mass fraction of 3% of pulp waste liquid precipitate, and feeding for 5min; 29 percent of pyrophyllite tailing particles with the granularity of 0-0.08 mm are taken by mass percent, and are fed for 5min; taking 14% by mass of magnesia particles, and feeding for 5min.
Example 4
The heat accumulating brick was prepared by the method described in example 1, except that:
in the step S1, taking the pyrophyllite tailing particles with the particle size of 1-3 mm, the mass percentage of 44% and the particle size of 0.08-1 mm, and feeding for 5min; taking pulp waste liquid with mass fraction of 3% of pulp waste liquid precipitate, and feeding for 5min; taking 31 mass percent of pyrophyllite tailing particles with the granularity of 0-0.08 mm, and feeding for 5min; taking 10% by mass of magnesia particles, and feeding for 5min.
TABLE 1 relevant process parameters for the finished products prepared in examples 1 to 4
| Example 1 | Example 2 | Example 3 | Example 4 | |
| Porosity% | 14.22 | 17.23 | 18.20 | 17.08 |
| Water absorption percentage% | 7.16 | 7.84 | 8.46 | 7.50 |
| Bulk density g/cm 3 | 2.31 | 2.24 | 2.15 | 2.20 |
| Thermal conductivity W/mK | 1.39 | 1.14 | 0.84 | 1.05 |
| Specific heat capacity J.kg -1 ·K -1 | 0.67 | 0.60 | 0.43 | 0.54 |
| Compressive strength Mpa | 65.42 | 52.30 | 51.28 | 58.81 |
| Coefficient of thermal diffusion m 2 /s | 1.16 | 0.97 | 0.87 | 0.90 |
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (10)
1. The heat accumulating brick is characterized by comprising 73-87 parts by weight of pyrophyllite tailings, 10-24 parts by weight of magnesia and 1-3 parts by weight of pulp waste liquid precipitate.
2. The heat storage brick according to claim 1, wherein the heat storage brick comprises 73-78 parts by weight of pyrophyllite tailings, 19-24 parts by weight of magnesite and 1-3 parts by weight of pulp waste liquid sediment;
the compressive strength of the heat accumulating brick is 45-70 Mpa, and the volume density is 2.0-2.5 g/cm 3 。
3. The heat storage brick according to claim 1, wherein the pyrophyllite tailings comprise the chemical components of SiO in percentage by mass 2 63％～67％，Al 2 O 3 24％～28％，TiO 2 0.5％～1.5％，Na 2 O 0.05％～0.10％，P 2 O 5 0.2％～0.3％，SO 3 4.7％～5.3％，K 2 O 0.2％～0.3％，CaO0.8％～1.1％，Fe 2 O 3 0.95％～1.10％。
4. The heat storage brick according to claim 1, wherein the pyrophyllite tailings are screened into three types of particles with the particle sizes of 0-0.08 mm, 0.08-1 mm and 1-3 mm; wherein the particle size is 0-0.08 mm, the weight ratio is 25-45%, the particle size is 0.08-1 mm, the weight ratio is 10-20%, and the particle size is 1-3 mm, the weight ratio is 40-60%.
5. The heat storage brick according to claim 1, wherein the chemical composition in mass percent in the magnesite is SiO 2 0.2％～0.3％，Al 2 O 3 0.5％～1％，TiO 2 0.2％～0.7％，CaO0.8％～1.5％，Fe 2 O 3 0.2％～0.5％，MgO 96％～98％；
The granularity of the magnesite is 1-3 mm.
6. The heat storage brick of claim 1 wherein the pulp waste stream is from an ammonium sulfite pulping waste stream.
7. The heat storage brick according to claim 1, wherein the pulp waste liquid contains 10.4% -16.4% of solid matters, 0.31% -1.32% of ash, 3.45% -5.93% of active organic carbon, 0.4% -2.8% of residual ammonium sulfite, 1.01% -1.87% of total nitrogen (N), 0.00236% -0.00968% of total phosphorus (P), 0.29% -0.59% of total potassium (K), 70% -85% of moisture, ph value of 6-7 and density of 1.044-1.076 g/L.
8. A method of making a thermal storage brick according to any one of claims 1 to 7, the method comprising:
s1: weighing all raw materials according to 73-87 parts by weight of pyrophyllite tailings, 10-24 parts by weight of magnesia and 1-3 parts by weight of pulp waste liquid sediment, and mixing in a mixer according to a certain feeding sequence to obtain a mixture;
s2: placing the mixture into a press machine to press and form under the pressure of 150-250 MPa to obtain a blank;
s3: drying the green body in air for 24-48 h, and then drying the green body in an oven at 100-130 ℃ for 24-48 h to obtain a brick blank;
s4: and (3) putting the green bricks into a firing kiln, sintering for 2-4 hours at 1050-1200 ℃, and cooling to obtain the heat accumulating bricks.
9. The method according to claim 8, wherein in step S1, preferably, the raw materials are weighed according to 73-78 parts by weight of the dickite tailings, 19-24 parts by weight of the magnesia and 1-3 parts by weight of the pulp waste liquid precipitate, and mixed according to a certain feeding sequence in a mixer to obtain a mixture;
the feeding sequence is as follows: pyrophyllite tailing particles with the granularity of 1-3 mm and 0.08-1 mm, and the feeding time is 3-5 min; pulp waste liquid is fed for 3-5 min; the pyrophyllite tailing particles with the diameter of 0-0.08 mm are fed for 3-5 min; the magnesia particles are added for 5-10 min;
the mixing time is 15-25 min.
10. Use of a heat accumulating brick according to any one of claims 1 to 7 or prepared by a method according to any one of claims 8 to 9 in industrial heating.
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