CN109181655A - The formula and preparation method of a kind of hot enhanced physical properties of iron ore for high temperature heat accumulation - Google Patents
The formula and preparation method of a kind of hot enhanced physical properties of iron ore for high temperature heat accumulation Download PDFInfo
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- CN109181655A CN109181655A CN201811145395.9A CN201811145395A CN109181655A CN 109181655 A CN109181655 A CN 109181655A CN 201811145395 A CN201811145395 A CN 201811145395A CN 109181655 A CN109181655 A CN 109181655A
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Abstract
The invention discloses the formulas and preparation method of a kind of hot enhanced physical properties of the iron ore for high temperature heat accumulation.The formula, including following mass percent meter component: iron ore 52-75%, sintering aid 3-10% and modifying agent 15-40%.The preparation method comprises the following steps: (1) crushing, grinds iron ore, and be sieved；(2) iron ore after step (1) sieving is uniformly mixed with sintering aid, modifying agent by formula ratio；(3) mixed powder compression moulding, the sintering obtained step (2), obtains the iron ore heat accumulating.Iron ore heat accumulating component of the invention is reasonable, modified iron ore product hot property improves a lot, specific heat capacity can be improved 25~50%, reach 0.93J/ (gK), thermal conductivity can be improved 110%~160%, reach 7.2W/ (mK), energy storage density is up to 4.2J/cm3K and phase-change heat-storage material storage density are suitable.Product stability under medium and high temperature is good, and thermal cycle is used up to 5000 times.Preparation method of the present invention is simple and practical, and sintering temperature is low, reduces energy consumption, and required heat-storing device small volume has industrial applications promotional value.
Description
Technical field
The invention belongs to heat-storage technology research fields, and in particular to a kind of hot physical property of iron ore for high temperature heat accumulation is strong
The formula and preparation method of change.
Background technique
Energy storage technology is the pith in energy science and technology, has important economy and society meaning.Energy storage is general
It is divided into storage and heat-storage technology.Electricity storage technology is usually the energy storage technology just occurred after the industrial revolution especially electric power revolution.
Compared to electricity storage technology, heat-storage technology development is more early, and this aspect is since in the activity of the mankind, most energy are to need
It to be converted and utilize by the form and link of thermal energy, especially in China, this ratio reaches 90% or more；Another party
Face depends on the simple and commonly used of heat-storage technology, if the heating of the northern area of China is to solve thermal energy using heat-storage technology
The mismatch of supply and demand in time.Heat-storage technology can be improved energy utilization rate, when solving energy conversion and utilizing, when supply and demand
Between, mismatch contradictory problems spatially, as heat-storage technology can solve " peak load shifting " of power grid in electric system, while
It is the effective way for improving urban environment using electric power.Heat-storage technology is mainly used in Solar use, building energy conservation, adopts at present
It warms up, Modern Greenhouse of Agriculture, Medical Instruments temperature control, clothes are warming, industry heating, heat pump drying unit energy conservation, military Infrared False
The numerous areas such as dress.In recent years, heat storing type electric heating is in China, especially to solve the problems such as environmental protection and electric energy make full use of
It is that the north is paid close attention to.
Heat storing type electric heating is that the heat that electric boiler generates is stored in heat-storing device in the low power consumption period, Deng Daoyong
Electric peak period stops electric boiler operation, is heated using the heat stored in heat-storing device to building.Heat storing type electric heating is filled
Divide and utilize time-of-use tariffs policy, the heating power load of high rate period is transferred to low rate period, it is basic in electricity consumption total amount
Under the premise of constant, the saving of the heating electricity charge is realized.For heating user, heat storing type electric heating significantly reduces heating
The electricity charge；For grid company, heat storing type electric heating reduces peak load, displaced peak electricity, alleviates power grid peak
Paddy is poor, improves the efficiency of entire electric system；For society, heat storing type electric heating has without any pollutant emission
Good environmental benefit.
The applicable heat-storage technology of heat storing type electric heating is related to sensible heat, latent heat and three kinds of heat chemistry heat accumulation, and wherein heat chemistry is stored up
Heat is currently laboratory technique, does not have popularization and application basis still.Latent heat of phase change and sensible heat compare, and latent heat of phase change has high heat storage
Density and thermal conductivity, also relative maturity and sensible heat material compare technology, there is obvious competitive advantage in the market, obtain common concern.
It is typical such as corrosivity it is contemplated that phase-change heat-storage material problems, heat transfer is low etc., although a variety of skills can be used
Phase-change material is encapsulated in porous pottery using micropore soakage principle effectively to be encapsulated by art, such as ceramic molded package technology
It is subject in ceramic material using corrosion and the high temperature losing issue to solve phase-change material, but packaging effect is limited, is using
There are problems, such as the leakage of the moisture absorption, fused salt, circulation cracking in journey, and service life cycle is limited, at high cost, face
Unavoidable technology shortcoming before production application, market is commonly used to still have core technology breakthrough.Therefore, in the domestic market
Stable application product there is no to occur.
The main product that application has been put into current heat accumulation market both domestic and external is sensible heat material, such as magnesia, iron oxide,
Silica brick etc..Sensible heat material compares with phase-change material many advantages, easy to operate if heat reservoir is simple, at low cost, and
Sensible heat material at high temperature performance is stablized, and service life cycle meets application requirement, but the generally existing thermal conductivity of sensible heat material is low, specific heat
Hold low problem.The present invention is based on the practical studies backgrounds, using ceramic doping means, to existing market mainstream sensible heat heat accumulation material
The iron ore heat accumulating of one of material carries out effective component doping adjustment, prepares the iron ore heat accumulation of novel high heat storage density
Material has extensive industrial application basis.
Summary of the invention
In order to overcome the shortcomings of the sensible heat material thermal storage performance of existing market circulation, it is improved that the present invention is based on ceramic performances
On doping techniques basis, provide a kind of for optimizing the formula and preparation method thereof of iron ore heat accumulating.Through overdoping
The storage density of modified iron ore can be suitable with phase-change heat-storage material storage density, to effectively improve the property of sensible heat material
Can, while it being made to have both the stable feature of medium temperature, the performance of high temperature, it can effectively extend thermal cycle service life, and prepare
Method simple practical shows with regard to current domestic and foreign literature, is result of study for the first time, has industrialization basis.Technology of the invention
Scheme is as follows.
A kind of formula of the hot enhanced physical properties of iron ore for high temperature heat accumulation, including following mass percent meter component:
Iron ore 52-75%
Sintering aid 3-10%
Modifying agent 15-40%.
Specifically, the iron ore includes: iron oxide 72-88%, silica 4-20%, oxygen by mass percentage
Change magnesium 1-5% and aluminium oxide 1-5%；The sintering aid includes bismuth oxide, diboron trioxide etc., and sintering aid helps to drop
The sintering temperature of low iron ore improves sample consistency, and then improves product storage density；The modifying agent, including proof gold
Belong to (aluminium, copper) and/or oxide (silica, aluminium oxide) etc., the modifying agent helps to strengthen the calorifics of iron ore
Energy is equal.
A kind of preparation method of the iron ore heat accumulating of the hot enhanced physical properties for high temperature heat accumulation, including with
Lower step:
(1) it crushes, grind iron ore, and be sieved；
(2) iron ore and sintering aid, modifying agent after step (1) being sieved uniformly are mixed by formula ratio；
(3) the mixed powder compression moulding that obtains step (2), sintering, obtain it is a kind of for high temperature heat accumulation-hot object
Property strengthen iron ore heat accumulating.
Specifically, the method for iron ore heat accumulating being prepared according to above-mentioned formula, it is described to be ground up, sieved rear iron ore
300 μm of partial size <.
Specifically, the method for iron ore heat accumulating being prepared according to above-mentioned formula, the compression moulding pressure be 200~
1000MPa, dwell time are 10s~10min.
Specifically, the method that the iron ore heat accumulating of hot enhanced physical properties is prepared according to above-mentioned formula, the agglomerant
Skill parameter are as follows: be warming up to 100 DEG C in 30~50min and keep the temperature 30min, 300 DEG C are warming up in subsequent 30~50min and keep the temperature
30min is finally warming up to target temperature with the rate of 5~15 DEG C/min, after keeping the temperature 2h, furnace cooling.
Effect of the invention
Compared with prior art, the invention has the following advantages that
(1) iron ore heat accumulating component of the invention is reasonable, and modified iron ore product hot property improves a lot,
Specific heat capacity can be improved 25~50%, reach 0.93J/ (gK), thermal conductivity can be improved 110%~160%, reach 7.2W/
(mK), energy storage density is up to 4.2J/cm3K and phase-change heat-storage material storage density are suitable.
(2) products of the present invention stability under medium and high temperature is good, thermal cycle long service life, up to 5000
It is secondary.
(3) preparation method of the invention is simple and practical, and sintering temperature is low, reduces energy consumption, and because product hot property is excellent,
For more traditional iron ore, required heat-storing device small volume has industrial applications promotional value.
Specific embodiment
The present invention provides a kind of formula of hot enhanced physical properties of the iron ore for high temperature heat accumulation and prepare iron ore storage
The method of hot material, below with reference to embodiment, invention is further described in detail, but these embodiments are not to this hair
Bright further limits.Comparative example and the sample hot property data of embodiment preparation are listed in table 1.Comparative example 1
Using iron ore as raw material, 300 μm of partial size < of iron ore powder is obtained by crushing, being ground up, sieved.It will be a certain amount of
Powder is added in mold, and pressure maintaining 30s, is then sintered under the pressure of 400MPa, sintering procedure are as follows: 40min is from room temperature
100 DEG C are raised to, and keeps the temperature 30min, rises to 300 DEG C in subsequent 40min again, and keep the temperature 30min, is finally warming up to 10 DEG C/min
1000 DEG C, keep the temperature furnace cooling after 2h.Obtain traditional iron ore brick " comparative example -1 ".
Embodiment 1
The formula for present embodiments providing a kind of modification iron ore for high temperature heat accumulation, can prepare sintering temperature
Low, the good Modified Iron mineral product of consistency, by mass percentage, formula include following components:
A kind of preparation method of above-mentioned modification iron ore for high temperature heat accumulation, comprising the following steps:
(1) it will crush, the iron ore sieving after grinding, and obtain 300 μm of partial size < of iron ore powder；
(2) iron ore and diboron trioxide, silica, the aluminum oxide after step (1) being sieved are equal by formula ratio
Even mixing；
(3) mixed powder for obtaining step (2) pressure maintaining 30s under the pressure of 400MPa, is then sintered, and is sintered journey
Sequence are as follows: 40min is raised to 100 DEG C from room temperature, and keeps the temperature 30min, rises to 300 DEG C in subsequent 40min again, and keep the temperature 30min, finally
800 DEG C are warming up to 10 DEG C/min, keeps the temperature furnace cooling after 2h.It obtains " implementing for the modification iron ore brick of high temperature heat accumulation
Example -1 ".
Embodiment 2
The formula for present embodiments providing a kind of modification iron ore for high temperature heat accumulation, it is excellent can to prepare hot property
Modified Iron mineral product, by mass percentage, formula include following components:
A kind of preparation method of above-mentioned modification iron ore brick for high temperature heat accumulation, comprising the following steps:
(1) it will crush, the iron ore sieving after grinding, and obtain 300 μm of partial size < of iron ore powder；
(2) iron ore and bismuth oxide, fine aluminium, silica, aluminum oxide after step (1) being sieved are by formula
Amount uniformly mixing；
(3) mixed powder for obtaining step (2) pressure maintaining 30s under the pressure of 400MPa, is then sintered, and is sintered journey
Sequence are as follows: 40min is raised to 100 DEG C from room temperature, and keeps the temperature 30min, rises to 300 DEG C in subsequent 40min again, and keep the temperature 30min, finally
850 DEG C are warming up to 10 DEG C/min, keeps the temperature furnace cooling after 2h.It obtains " implementing for the modification iron ore brick of high temperature heat accumulation
Example -2 ".
Embodiment 3
The formula for present embodiments providing a kind of modification iron ore for high temperature heat accumulation, it is excellent can to prepare hot property
Modified Iron mineral product, by mass percentage, formula include following components:
A kind of preparation method of above-mentioned modification iron ore brick for high temperature heat accumulation, comprising the following steps:
(1) it will crush, the iron ore sieving after grinding, and obtain 300 μm of partial size < of iron ore powder；
(2) iron ore and diboron trioxide, fine aluminium, silica, aluminum oxide after step (1) being sieved are by formula
Amount uniformly mixing；
(3) mixed powder for obtaining step (2) pressure maintaining 30s under the pressure of 400MPa, is then sintered, and is sintered journey
Sequence are as follows: 40min is raised to 100 DEG C from room temperature, and keeps the temperature 30min, rises to 300 DEG C in subsequent 40min again, and keep the temperature 30min, finally
850 DEG C are warming up to 10 DEG C/min, keeps the temperature furnace cooling after 2h.It obtains " implementing for the modification iron ore brick of high temperature heat accumulation
Example -3 ".
Table 1
Seen from table 1, compared with traditional iron ore brick, hot property is significantly improved sample prepared by the present invention, heat
Cycle life is longer.And the present invention can be seen that by embodiment and prepare the method simple practical of sample, have commercial introduction and
Application value.
Based on the embodiments of the present invention, those skilled in the art can also make a variety of variations accordingly, but any
It is equal with the present invention or similar variation shall fall within the protection scope of the present invention.
Claims (7)
1. a kind of formula of the hot enhanced physical properties of iron ore for high temperature heat accumulation, which is characterized in that including following quality percentage
Than counting component:
Iron ore 52-75%
Sintering aid 3-10%
Modifying agent 15-40%.
2. formula according to claim 1, which is characterized in that the iron ore includes: iron oxide by mass percentage
72-88%, silica 4-20%, magnesia 1-5% and aluminium oxide 1-5%；The sintering aid includes bismuth oxide, three oxygen
Change two boron；The modifying agent includes pure metal and/or oxide.
3. formula according to claim 1 or 2, which is characterized in that the modifying agent includes aluminium or copper；Silica and/
Or aluminium oxide.
4. the method that any one of -3 formulas prepare iron ore heat accumulating according to claim 1, which is characterized in that including with
Lower step:
(1) it crushes, grind iron ore, and be sieved；
(2) iron ore after step (1) sieving is uniformly mixed with sintering aid, modifying agent by formula ratio；
(3) mixed powder compression moulding, the sintering obtained step (2), obtains the iron ore heat accumulating.
5. according to the method described in claim 4, it is characterized in that, described in step (1) be sieved after iron ore partial size < 300
μm。
6. according to the method described in claim 4, it is characterized in that, compression moulding pressure described in step (3) be 200~
1000MPa, dwell time are 10s~10min.
7. according to the method described in claim 4, it is characterized in that, the technological parameter of sintering described in step (3) are as follows: 30~
It is warming up to 100 DEG C in 50min and keeps the temperature 30min, 300 DEG C are warming up in subsequent 3050min and keep the temperature 30min, finally with 5~15
DEG C/rate of min is warming up to target temperature, and after keeping the temperature 1~4h, furnace cooling.
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| CN113512408A (en) * | 2021-07-05 | 2021-10-19 | 华北电力大学 | Composite heat storage material based on steel slag-coal gangue and preparation method thereof |
| CN115073136A (en) * | 2022-06-10 | 2022-09-20 | 武汉理工大学 | High-steel-slag-content heat absorption and storage integrated ceramic and preparation method thereof |
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