CN110408368B - Preparation method of salt storage material - Google Patents
Preparation method of salt storage material Download PDFInfo
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- CN110408368B CN110408368B CN201910671076.XA CN201910671076A CN110408368B CN 110408368 B CN110408368 B CN 110408368B CN 201910671076 A CN201910671076 A CN 201910671076A CN 110408368 B CN110408368 B CN 110408368B
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- oxide
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- fly ash
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- storage material
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- 239000011232 storage material Substances 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 150000003839 salts Chemical class 0.000 title abstract description 38
- 239000010881 fly ash Substances 0.000 claims abstract description 43
- 229910017053 inorganic salt Inorganic materials 0.000 claims abstract description 30
- 238000004056 waste incineration Methods 0.000 claims abstract description 25
- 238000005245 sintering Methods 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 3
- 238000003825 pressing Methods 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 10
- 238000005406 washing Methods 0.000 claims description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 6
- 239000000292 calcium oxide Substances 0.000 claims description 6
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 6
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 6
- 239000000395 magnesium oxide Substances 0.000 claims description 5
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 5
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 5
- CHWRSCGUEQEHOH-UHFFFAOYSA-N potassium oxide Chemical compound [O-2].[K+].[K+] CHWRSCGUEQEHOH-UHFFFAOYSA-N 0.000 claims description 5
- 229910001950 potassium oxide Inorganic materials 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 5
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 5
- 229910001948 sodium oxide Inorganic materials 0.000 claims description 5
- 238000013329 compounding Methods 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 abstract 1
- 230000005684 electric field Effects 0.000 description 5
- 238000005338 heat storage Methods 0.000 description 4
- 239000012778 molding material Substances 0.000 description 4
- 229910001385 heavy metal Inorganic materials 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000013590 bulk material Substances 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011978 dissolution method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 229910000464 lead oxide Inorganic materials 0.000 description 1
- HTUMBQDCCIXGCV-UHFFFAOYSA-N lead oxide Chemical compound [O-2].[Pb+2] HTUMBQDCCIXGCV-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/18—Materials not provided for elsewhere for application to surfaces to minimize adherence of ice, mist or water thereto; Thawing or antifreeze materials for application to surfaces
- C09K3/185—Thawing materials
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/08—Materials not undergoing a change of physical state when used
- C09K5/14—Solid materials, e.g. powdery or granular
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Thermal Sciences (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a preparation method of a salt storage material. The method disclosed by the invention comprises the steps of pressing and forming the waste incineration fly ash with the inorganic salt content of 6-20wt%, heating to 400-800 ℃, and then directly electrifying and sintering the formed part to obtain the salt storage material with the inorganic salt content of 6-20 wt%. The method overcomes the problems that the traditional method for preparing the salt storage material by utilizing the waste incineration fly ash is difficult to sinter, the inorganic salt sintering process is easy to volatilize and the like, and has important economic value and ecological environmental protection value for harmless treatment and resource utilization of the waste incineration fly ash.
Description
Technical Field
The invention relates to a salt storage material technology, in particular to a preparation method of a salt storage material.
Background
The salt storage material has wide application in the fields of road snow melting, ice suppression and heat storage materials. The existing salt storage material preparation method mainly adopts high-temperature sintering, the temperature is as high as 1400 ℃, salt content fluctuation before and after sintering is large, salt volatilization is serious, the material manufacturing is not facilitated, and the problems of high energy consumption, high emission, easy air pollution and the like exist in the high-temperature sintering process.
Disclosure of Invention
Aiming at the defects or shortcomings of the prior art, the invention provides a preparation method of a salt storage material.
The preparation method of the salt storage material provided by the invention comprises the following steps: the method comprises the steps of pressing and molding the waste incineration fly ash with the inorganic salt content of 6-20wt%, heating to 400-800 ℃, and then directly electrifying and sintering the molded part to obtain the salt storage material with the inorganic salt content of 6-20 wt%.
Furthermore, the volatilization rate of the inorganic salt in the preparation method is less than 1 percent.
In some embodiments, fly ash is added to the waste fly ash.
Preferably, the content of the oxides in the waste incineration fly ash or the waste incineration fly ash and the fly ash is 80-94wt%, and the oxides include silicon oxide, calcium oxide, magnesium oxide, aluminum oxide, iron oxide, sodium oxide and potassium oxide.
More preferably, the waste incineration fly ash or the waste incineration fly ash and the fly ash of the invention contains 20 to 40wt% of silicon oxide, 20 to 65 wt% of calcium oxide and magnesium oxide, 5 to 30 wt% of aluminum oxide and iron oxide, and 2 to 8wt% of sodium oxide and potassium oxide.
Optionally, the forming pressure is 10-30Mpa, the electrifying voltage is 5-50V/mm, and the sintering time is 30-300 seconds, wherein/mm is the unit distance between electrified electrodes.
Optionally, the content of inorganic salt in the raw materials is controlled to be 6-20wt% by adopting a water washing method or a water washing and compounding method.
The salt storage material prepared by the invention can be used as a road snow melting agent or a heat storage material. Compared with the prior art, this beneficial effect is:
(1) in the traditional preparation method of the salt storage material, the oxide raw material composition has high content of silicon oxide and aluminum oxide, and the material with high content of calcium oxide is difficult to sinter, and needs a high-temperature sintering temperature of more than 1400 ℃, the sinterable oxide has wide composition range and low temperature, and the highest sintering furnace temperature is only 800 ℃; the invention utilizes the precondition that considerable dissolved salt exists in the waste incineration fly ash, controls the content of the dissolved salt in the material, and prepares the salt storage material through rapid electric field sintering, thereby not only avoiding the problem that the dissolved salt is volatilized in the traditional salt storage material in high-temperature sintering, decomposing dioxin in the waste incineration fly ash, reasonably storing the heavy metal in the material as the useful composition of the material through sintering and curing, realizing the resource utilization and harmless disposal of the waste incineration fly ash, having good economic and social benefits, providing the cheap snow melting and ice suppressing material guarantee for the safe operation of roads in winter, and providing the high heat storage material for the high-temperature heat storage equipment.
(2) Furthermore, the effect of solidifying heavy metals can be obtained by controlling the content and the proportion of the oxides in the fly ash.
(3) The preparation method has short preparation time, greatly reduces the volatilization of inorganic salt in the sintering process, has the volatilization rate of the inorganic salt less than 1 weight percent, and has small fluctuation of dissolved salt components.
(4) The salt storage material prepared by the invention has high density, high strength and moderate salt content, and is convenient for practical application.
Drawings
FIG. 1 is an appearance diagram of a salt storage material obtained in example 2;
FIG. 2 is an appearance diagram of a salt storage material obtained in example 3.
Detailed Description
The content of inorganic salt in the general waste incineration fly ash is 10-40%, the invention can adopt a water washing method to control the content of water-soluble salt in the waste incineration fly ash to be within the range of 6-20wt%, or the fly ash is compounded with the original ash after the content of the water-washed salt is controlled to be less than 5%, so as to obtain the preparation raw material with the content of the inorganic salt of 6-20 wt%. The inorganic salt content is the salt content of the inorganic salt determined by a water dissolution method.
The oxide types in the waste incineration fly ash are generally silicon oxide, calcium oxide, magnesium oxide, aluminum oxide, iron oxide, sodium oxide, potassium oxide, lead oxide, chromium oxide and/or the like, and because the waste incineration fly ash has large component fluctuation and large variation range of the oxide content, the adjustment of the oxide content can be realized by measures such as adding fly ash and the like.
The inorganic salt volatilization rate of the present invention (mass percentage content of inorganic salt in the preparation raw material-mass percentage content of inorganic salt in the salt-storing material)/mass percentage content of inorganic salt in the preparation raw material) is 100%.
The "V/mm" in the present invention is a unit of directly applying a voltage to the molding material, and indicates a magnitude of the voltage applied per millimeter length of the molding material, wherein the length direction of the molding material is a direction from one electrode to another electrode after the molding material is installed between a set of electrodes.
Other terms in the present invention are understood according to conventional knowledge of those skilled in the relevant art, unless otherwise specified.
Example 1:
TABLE 1 original fly ash chemical composition converted to oxide composition
The waste incineration fly ash with the inorganic salt content of 30 wt% as shown in Table 1 is washed with water until the salt content is 20%, dried, pressed and molded under the pressure of 10Mpa, and sintered for 30 seconds under the electric field of 50V/mm at the temperature of 400 ℃ to obtain the salt storage material with the inorganic salt content of 20%.
Example 2:
washing the waste incineration fly ash with the inorganic salt content of 30 wt% shown in the table 1 until the salt content is less than 5% to obtain washing fly ash, and compounding 45 wt% of original waste incineration fly ash, 50 wt% of washing fly ash and 5 wt% of fly ash (shown in the table 2) to obtain waste incineration fly ash with the inorganic salt content of 18.3%;
TABLE 2 fly ash ingredient table
The compounded waste incineration fly ash is pressed and molded under the pressure of 20Mpa, and is sintered for 150 seconds under the electric field of 30V/mm at the temperature of 600 ℃, so that a salt storage material with the inorganic salt content of 18.1 percent is obtained, and the appearance of the material is shown in figure 1;
crushing the material into a sample to be detected with the granularity of less than 9.5mm, and performing heavy metal leaching detection by adopting a GBT30810-2014 method, wherein the material inspection result of the embodiment is qualified;
TABLE 3
The bulk material was taken for conductivity measurements and the conductivity of the material of this example in deionized water is shown in table 3.
Example 3:
washing the waste incineration fly ash with the inorganic salt content of 30 wt% shown in the table 1 until the salt content is less than 5 wt% and drying to obtain washed fly ash, compounding the original waste incineration fly ash and 50 wt% of the washed fly ash to obtain waste incineration fly ash with the salt content of 8.2 wt%, performing compression molding under the pressure of 20MPa, and sintering for 200 seconds at 480 ℃ under an electric field of 40V/mm to obtain a salt storage material with the inorganic salt content of 8.2 wt%, wherein the appearance of the material is shown in fig. 2; conductivity measurements were performed on the bulk material, and the conductivity of the material of this example in deionized water is shown in table 4:
TABLE 4
Example 4:
the waste incineration fly ash with the inorganic salt content of 30 wt% as shown in Table 1 is washed with water until the salt content is 6%, dried, pressed and molded under the pressure of 30Mpa, and sintered for 300 seconds under the electric field of 5V/mm at the temperature of 800 ℃ to obtain the salt storage material with the inorganic salt content of 6%.
Claims (3)
1. A method for preparing salt-storage material is characterized in that the method comprises the steps of pressing and forming garbage incineration fly ash with inorganic salt content of 6-20wt%, heating to 400-800 ℃, and then directly electrifying and sintering the formed part to obtain the salt-storage material with inorganic salt content of 6-20 wt%;
fly ash is added into the garbage fly ash;
the content of oxides in the waste incineration fly ash and the fly ash is 80-94wt%, and the oxides comprise silicon oxide, calcium oxide, magnesium oxide, aluminum oxide, iron oxide, sodium oxide and potassium oxide;
the content of the silicon oxide is 20-40wt%, the content of the calcium oxide and the magnesium oxide is 20-65 wt%, the content of the aluminum oxide and the iron oxide is 5-30 wt%, and the content of the sodium oxide and the potassium oxide is 2-8 wt%;
the molding pressure is 10-30Mpa, the electrifying voltage is 5-50V/mm, the sintering time is 30-300 seconds, wherein/mm is the unit distance between electrified electrodes;
the volatilization rate of the inorganic salt in the preparation method is less than 1 percent.
2. The method for preparing a salt-storage material according to claim 1, wherein the content of the inorganic salt in the raw materials is controlled to be 6 to 20wt% by water washing or water washing and compounding.
3. Use of the salt-storing material prepared by the method of claim 1 as a road snow-melting agent.
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| CN201910671076.XA CN110408368B (en) | 2019-07-24 | 2019-07-24 | Preparation method of salt storage material |
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| CN110408368B true CN110408368B (en) | 2021-07-06 |
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| CN115477494B (en) * | 2022-06-13 | 2023-11-07 | 重庆交通大学 | Anti-freezing material for fly ash generated by incineration of household garbage and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108080391A (en) * | 2017-11-28 | 2018-05-29 | 中广核研究院有限公司 | Waste treatment system and method |
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| CN1298658C (en) * | 2005-01-14 | 2007-02-07 | 清华大学 | Method for preparing light aggregate through burning fly ash by using garbage |
| CN104893664B (en) * | 2015-05-21 | 2016-10-26 | 长安大学 | A kind of road is with releasing salt material and preparation method and application |
| KR101820902B1 (en) * | 2016-06-07 | 2018-01-23 | 주식회사 그린환경 | Eco-friendly deicer composition using bottom ash |
| CN106995682B (en) * | 2017-02-15 | 2018-12-04 | 长安大学 | A kind of method and device using incineration of refuse flyash preparation Road Snow Agent |
| CN109021931A (en) * | 2018-08-22 | 2018-12-18 | 全球能源互联网研究院有限公司 | A kind of phase-change heat-storage material preparation method using unorganic glass as heat-storage medium |
| CN109054750B (en) * | 2018-09-17 | 2021-03-02 | 杭州秀澈环保科技有限公司 | Process for preparing snow-melting agent by utilizing garbage fly ash |
| CN109575880B (en) * | 2018-11-01 | 2021-07-02 | 杭州秀澈环保科技有限公司 | Method for preparing I-type snow melting agent by utilizing garbage fly ash |
| CN109251729B (en) * | 2018-11-01 | 2021-06-22 | 杭州秀澈环保科技有限公司 | Method for simultaneously preparing I-type and II-type snow melting agents by utilizing garbage fly ash |
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| 憎水蓄盐型抗凝点沥青路面外加剂的制备;赵苏等;《沈阳建筑大学学报(自然科学版)》;20180915;第34卷(第5期);第905-911页 * |
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