CN114350422B - Zinc slag composite fuel and preparation method thereof - Google Patents
Zinc slag composite fuel and preparation method thereof Download PDFInfo
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- CN114350422B CN114350422B CN202210035242.9A CN202210035242A CN114350422B CN 114350422 B CN114350422 B CN 114350422B CN 202210035242 A CN202210035242 A CN 202210035242A CN 114350422 B CN114350422 B CN 114350422B
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- 239000011701 zinc Substances 0.000 title claims abstract description 162
- 229910052725 zinc Inorganic materials 0.000 title claims abstract description 156
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims abstract description 155
- 239000002893 slag Substances 0.000 title claims abstract description 123
- 239000000446 fuel Substances 0.000 title claims abstract description 42
- 239000002131 composite material Substances 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 239000000843 powder Substances 0.000 claims abstract description 115
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 88
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000012535 impurity Substances 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 20
- 229910052786 argon Inorganic materials 0.000 claims abstract description 19
- 238000000889 atomisation Methods 0.000 claims abstract description 15
- 238000003723 Smelting Methods 0.000 claims abstract description 12
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 9
- 235000021355 Stearic acid Nutrition 0.000 claims abstract description 9
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical group CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims abstract description 9
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000005011 phenolic resin Substances 0.000 claims abstract description 9
- 229920001568 phenolic resin Polymers 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 239000008117 stearic acid Substances 0.000 claims abstract description 9
- 238000002844 melting Methods 0.000 claims abstract description 6
- 230000008018 melting Effects 0.000 claims abstract description 6
- 239000000080 wetting agent Substances 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 13
- 229910052742 iron Inorganic materials 0.000 claims description 9
- 238000009689 gas atomisation Methods 0.000 claims description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical group CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 238000012216 screening Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 10
- 238000003860 storage Methods 0.000 abstract description 4
- 239000011248 coating agent Substances 0.000 abstract description 3
- 238000000576 coating method Methods 0.000 abstract description 3
- 238000011049 filling Methods 0.000 abstract description 3
- 238000002485 combustion reaction Methods 0.000 description 8
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 6
- 238000005246 galvanizing Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000011812 mixed powder Substances 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 239000011787 zinc oxide Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- YZCKVEUIGOORGS-NJFSPNSNSA-N Tritium Chemical compound [3H] YZCKVEUIGOORGS-NJFSPNSNSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000013064 chemical raw material Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 1
- 229910052815 sulfur oxide Inorganic materials 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Manufacture And Refinement Of Metals (AREA)
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Abstract
The invention discloses a zinc slag powder composite fuel and a preparation method thereof, wherein the composite fuel comprises zinc slag powder, and the surface of the zinc slag powder is coated with iron powder; wherein, the weight percentage of the zinc slag powder is 60-80%, the weight percentage of the iron powder is 20-40%, and the balance is stearic acid or phenolic resin and unavoidable impurities. Firstly, adding zinc slag raw materials into a smelting furnace of an air atomization device, pressurizing the furnace by filling argon, and air atomizing after complete melting to prepare zinc slag powder after atomization; and then coating the surface of the zinc slag powder with iron powder. According to the invention, the iron powder is coated on the surface of the zinc slag powder, so that the inflammability and the explosiveness of the zinc slag powder in the storage, transportation and application processes are reduced, and the performance of the zinc slag powder is relatively stable.
Description
Technical Field
The invention relates to the technical field of new materials, in particular to a zinc slag powder composite fuel and a preparation method thereof.
Background
China is the largest carbon-emitting country worldwide and is responsible for coping with climate change. In the face of increasingly prominent energy safety and greenhouse gas emission reduction pressures, research into "alternative fuels" is a current urgent task. The metal fuel is used as a novel fuel with high heat value, the energy density of the metal fuel is far higher than that of fossil fuels such as coal, petroleum, natural gas and the like, and harmful gases such as sulfur oxides, nitrogen oxides and the like can not be generated in the combustion process.
In a zinc consumption system, hot galvanizing zinc consumption always occupies the first place, and in recent years, the China zinc plating industry rapidly develops, and the zinc consumption for hot galvanizing is more than two million tons. A large amount of zinc slag is generated in the galvanization process, the zinc slag amount generated by hot galvanizing is calculated according to 10 percent of zinc slag produced per ton, the zinc slag amount generated by hot galvanizing every year is 20-30 ten thousand tons, the most harmful element in the zinc slag is Fe, and the zinc slag is formed by the following chemical reaction: 13zn+fe=fezn 13. The key point of the conventional zinc slag utilization is to carry out iron removal treatment. The domestic recovery of zinc slag is generally carried out by adopting a crucible for melting, the crucible is basically made of iron materials, iron pollution is serious in the melting process, and crude zinc is producedThe yield is 80-90%, and crude zinc is produced and is mostly used as raw materials for producing zinc oxide or is directly supplied to a low-end galvanization plant to be used as a galvanization raw material. The direct preparation of the zinc slag powder fuel by adopting the zinc slag is dangerous, because zinc powder is inflammable and explosive, the transportation safety is threatened, and the use process is dangerous. Therefore, the more common metal fuel is iron powder. Patent No. 201710378169.4, publication No. CN 107355300A. The scheme takes nano iron powder as fuel, the nano iron powder is ignited after being mixed with oxygen, and the generated heat energy is converted into electric energy to realize power generation; for combustion products Fe 3 O 4 Reduction of Fe by hydrogen 3 O 4 The recovery of combustion products is realized. The nano iron powder power generation scheme of the invention is green and environment-friendly, has no pollution, can be repeatedly utilized, and can replace the existing non-renewable energy sources. However, the method requires nanoscale iron powder, the nanoscale iron powder has higher cost and is not beneficial to industrial application, in addition, the agglomeration phenomenon can occur in the application process of the nanoscale iron powder, and the problems of insufficient combustion or low heat value can be possibly caused. The fuel is single iron powder, and the combustion heat value of the iron powder is low relative to that of carbon and zinc.
The zinc slag has high yield, high recycling cost and serious environmental pollution, and if the zinc slag powder can be applied to the field of metal fuels, the iron removing link is omitted, iron in the zinc slag can be combusted and released, waste is changed into valuable, and the method has good application prospect.
Disclosure of Invention
The invention aims to provide a zinc slag composite fuel and a preparation method thereof, and the iron powder is coated on the surface of the zinc slag powder, so that the inflammability and the explosiveness of the zinc slag powder in the storage, transportation and application processes are reduced, and the performance of the zinc slag powder is relatively stable.
In order to solve the problems, the invention adopts the following technical scheme:
a zinc slag powder composite fuel comprises zinc slag powder, wherein the surface of the zinc slag powder is coated with iron powder; wherein, the weight percentage of the zinc slag powder is 60-80%, the weight percentage of the iron powder is 20-40%, and the balance is stearic acid or phenolic resin and unavoidable impurities.
Preferably, the zinc slag powder comprises more than or equal to 80 weight percent of Zn, the balance of Fe and unavoidable impurities, and the particle size of the zinc slag powder is 170-470 mu m.
Preferably, the purity of the iron powder is as follows by weight percent: fe is more than or equal to 97%, C is less than 1.0%, the balance is unavoidable impurities, and the particle size of the iron powder is less than 1 mu m.
Preferably, the thickness of the iron powder layer on the surface of the zinc slag powder is not less than 10 mu m.
The preparation process of zinc slag powder composite fuel includes adding zinc slag material into gas atomizing smelting furnace, and pressurizing with argon to prevent zinc evaporation. And (3) after complete melting, performing gas atomization to prepare zinc slag powder, and then coating iron powder on the surface of the zinc slag powder.
Further, the pressure in the smelting furnace is 3.0-4.0 MPa, the smelting temperature is 900-950 ℃, the atomization pressure is 2.0-4.0 MPa, and zinc slag powder is collected through screening after gas atomization; adding wetting agent into the collected zinc slag powder to uniformly distribute the wetting agent on the surface of the zinc slag powder, mixing iron powder and the wetted zinc slag powder according to a proportion, wherein the mixing proportion is 60-80% of the weight percentage of the zinc slag powder, 20-40% of the weight percentage of the iron powder, the mixing temperature is 50-70 ℃, the mixing time is 20-30 min, and the mixture is placed at room temperature for 5-8 hours and packaged after drying. The thickness of the iron powder layer on the surface of the zinc slag powder is not less than 10 mu m.
The argon filling pressurization is carried out, and the pressure is 3.0-4.0 MPa, so that the zinc is prevented from volatilizing in a large amount; the smelting temperature is 900-950 ℃, and zinc slag can be guaranteed to be sufficiently melted and atomized smoothly when the smelting temperature is higher than 900 ℃, and a large amount of volatilization of zinc is avoided when the smelting temperature is lower than 950 ℃; the atomizing pressure is 2.0-4.0 MPa, so that stable atomizing effect can be ensured. The powder mixing process ensures that the temperature of the mixed powder is 50-70 ℃, avoids massive solid phase precipitation of wetting agents (stearic acid and phenolic resin), reduces the capability of the wetting agents to adhere to iron powder, and ensures that the thickness of an iron powder layer on the surface of zinc slag powder is less than 10 mu m. The thickness of the iron powder layer on the surface of the zinc slag powder is larger than 10 mu m, so that the activity of zinc slag particles can be reduced, and the safety of the zinc slag powder in the storage, transportation and application processes can be ensured. The weight percentage of the iron powder is 20-40% to ensure that enough iron powder is coated on the surface of the zinc slag powder to ensure that the zinc slag powder reaches more than 10 mu m and ensure the stability of the zinc slag composite fuel.
Preferably, the zinc slag raw material comprises more than or equal to 80% of Zn, and the balance of Fe and unavoidable impurities; the atomization is started after zinc slag is completely melted for 5-10 min; after the gas atomization is finished, continuously introducing argon into the furnace, wherein the pressure of the argon is 0.1-0.2 MPa, and stopping introducing the argon until the temperature of the zinc slag powder is reduced to below 50 ℃; the zinc slag powder comprises more than or equal to 80% of Zn, and the balance of Fe and unavoidable impurities; and (5) sieving zinc dross powder with the particle size of 170-470 mu m.
Argon is continuously introduced into the furnace after atomization to prevent zinc slag powder from being oxidized due to air suction in the cooling process of the atomization chamber. The zinc slag powder with the particle size of 170-470 mu m is sieved, the surface of the zinc slag powder is favorably coated by the iron powder when the zinc slag powder is larger than 170 mu m, and the powder uniformity and the combustion stability are prevented from being influenced by oversized particles when the zinc slag powder is smaller than 470 mu m. Wherein, the components of the zinc slag raw material, zn is more than or equal to 80 percent, so as to ensure that the composite zinc slag powder fuel has higher heat value. The atomization is started after the zinc slag is completely melted for 5 to 10 minutes so as to ensure that the zinc slag liquid is sufficiently uniform. After the gas atomization is finished, argon is continuously introduced into the furnace, and the pressure of the argon is 0.1-0.2 MPa, so that zinc slag oxidation caused by air suction in the furnace in a high-temperature state is prevented. And stopping introducing argon until the temperature of the zinc slag powder is reduced to below 50 ℃ to ensure that the zinc slag is not oxidized.
Preferably, the wetting agent is ethanol solution with the mass percent of stearic acid or phenolic resin of 3-5%, the addition amount of the wetting agent is 1-2% of the weight of the zinc dross powder, the wetting agent is uniformly distributed on the surface of the zinc dross powder and is stirred by a stirrer, and the stirring time is 10-20 min; the purity of the iron powder is more than or equal to 97 percent of Fe, the C is less than 1.0 percent, the balance is unavoidable impurities, and the particle size of the iron powder is less than 1 mu m.
The invention provides a zinc slag composite fuel, which is characterized in that iron powder is coated on the surface of zinc slag powder to reduce the inflammability and the explosiveness of the zinc slag powder in the storage, transportation and application processes, so that the performance of the zinc slag powder is relatively stable. The method not only utilizes waste zinc slag, but also mainly generates zinc oxide after combustion, and the purified zinc oxide can be used as a chemical raw material for multi-field application. The powder has the characteristics of good combustibility, no agglomeration and high heat value, not only omits the link of removing iron from zinc slag, but also can burn and release heat in the zinc slag, thereby changing waste into valuable. The powdered fuel is easy to produce, and only trace carbon dioxide exists in the reaction product, so that compared with coal and petroleum carbon-based fuels, the carbon emission of the powdered fuel is obviously reduced.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The described embodiments are only some, but not all, embodiments of the invention. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention relates to a zinc slag powder composite fuel, which comprises zinc slag powder, wherein the surface of the zinc slag powder is coated with iron powder; wherein, the weight percentage of the zinc slag powder is 60-80%, the weight percentage of the iron powder is 20-40%, and the balance is stearic acid or phenolic resin and unavoidable impurities. The zinc slag powder comprises more than or equal to 80 weight percent of Zn, the balance of Fe and unavoidable impurities, and the particle size of the zinc slag powder is 170-470 mu m. The purity of the iron powder is as follows by weight percent: fe is more than or equal to 97%, C is less than 1.0%, the balance is unavoidable impurities, and the particle size of the iron powder is less than 1 mu m. The thickness of the iron powder layer on the surface of the zinc slag powder is not less than 10 mu m. Specific examples of the zinc dross powder composite fuel of the invention are shown in table 1.
The zinc slag powder composite fuel is simple to prepare. Firstly, zinc slag is added into an induction furnace of an air atomization device, argon is filled into the furnace for pressurization, and zinc evaporation is prevented. After complete melting, carrying out gas atomization to prepare zinc slag powder, and then carrying out surface coating iron powder on the zinc slag powder, wherein the specific preparation method comprises the following steps:
1) Adding zinc slag raw materials into a smelting furnace, and simultaneously filling argon and pressurizing, wherein the pressure is 3.0-4.0 MPa.
2) The smelting temperature is 900-950 ℃, the atomization is started after 5-10 min of melting, and the atomization pressure is 2.0-4.0 MPa.
3) And after atomization is finished, continuously introducing argon into the furnace, wherein the argon pressure is 0.1-0.2 MPa, and stopping introducing argon until the temperature of the composite zinc slag powder is reduced to below 50 ℃.
4) And collecting powder, and screening zinc slag powder with the granularity of 170-470 mu m, wherein the components of the zinc slag powder are more than or equal to 80% of Zn, and the balance is Fe and unavoidable impurities.
5) The zinc slag powder is wetted, the wetting agent is ethanol solution with the mass percent of stearic acid or phenolic resin of 3-5%, the addition amount of the wetting agent is 1-2% of the weight of the zinc slag powder, and the wetting agent is uniformly distributed on the surface of the zinc slag powder by stirring by a stirrer for 10-20 min.
6) Mixing powder, namely mixing iron powder with wet zinc slag powder according to a proportion, wherein the mixing proportion is 60-80% of the weight of the zinc slag powder, and 20-40% of the weight of the iron powder; the purity of the iron powder is more than or equal to 97 percent of Fe, the C is less than 1.0 percent, the balance is unavoidable impurities, and the particle size is less than 1 mu m; the powder mixing process ensures that the temperature of the mixed powder is 50-70 ℃ and the stirring time is 20-30 min.
7) Placing the mixed powder for 5-8 hours at room temperature, packaging after drying, and sealing packaging for later use.
Specific examples of the preparation method of the zinc dross powder composite fuel are shown in table 2.
TABLE 1 Zinc slag powder composite Fuel composition
The proportion of zinc slag powder and the proportion of iron powder are less than 100 percent, and the balance is wetting agent (stearic acid or phenolic resin) and unavoidable impurities.
Table 2 key parameters and effects of the preparation process
In the comparative example, 300 mu m iron powder is selected as a raw material for testing, the purity of the iron powder is 99.3%, and the weight percentages of the chemical components of the iron powder are as follows: c <0.05%, the balance being Fe and some impurity elements. The fluidity of the iron powder was measured to be 27s (50 g), and the fluidity was poor. The combustion heat value of the iron powder is 4.5MJ/Kg measured by a calorimeter. It can be seen that the heat release of pure iron powder is much smaller than that of the composite powder fuel of the invention.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (11)
1. The zinc slag powder composite fuel is characterized by comprising zinc slag powder, wherein the surface of the zinc slag powder is coated with iron powder; wherein, the weight percentage of the zinc slag powder is 60-80%, the weight percentage of the iron powder is 20-40%, and the balance is stearic acid or phenolic resin and unavoidable impurities; the grain diameter of the zinc slag powder is 170-470 mu m, the grain diameter of the iron powder is less than 1 mu m, and the thickness of the iron powder layer on the surface of the zinc slag powder is not less than 10 mu m.
2. The zinc slag powder composite fuel according to claim 1, wherein the zinc slag powder comprises more than or equal to 80% by weight of Zn, the balance of Fe and unavoidable impurities, and the particle size of the zinc slag powder is 220-400 mu m.
3. The zinc dross powder composite fuel according to claim 1, wherein the iron powder has a purity of: fe is more than or equal to 97%, C is less than 1.0%, the balance is unavoidable impurities, and the grain size of the iron powder is less than 0.6 mu m.
4. The zinc dross powder composite fuel according to claim 1, wherein the thickness of the iron powder layer on the surface of the zinc dross powder is not less than 14 μm.
5. A method for preparing zinc slag powder composite fuel according to any one of claims 1 to 4, which is characterized in that firstly, zinc slag raw materials are added into a smelting furnace of an air atomization device, argon is filled into the furnace for pressurization, the pressure in the smelting furnace is 3.0 to 4.0MPa, the smelting temperature is 900 to 950 ℃, air atomization is carried out after complete melting to prepare zinc slag powder, and then iron powder is coated on the surface of the zinc slag powder; the atomization pressure is 2.0-4.0 MPa, and zinc slag powder is collected through screening after gas atomization; adding wetting agent into the collected zinc slag powder to uniformly distribute the wetting agent on the surface of the zinc slag powder, and mixing the iron powder and the wetted zinc slag powder according to the proportion, wherein the mixing proportion is that the weight percentage of the zinc slag powder is 60-80%, the weight percentage of the iron powder is 20-40%, and the mixing temperature is 50-70 ℃.
6. The method for preparing zinc dross powder composite fuel according to claim 5, wherein the mixing time is 20-30 min, the zinc dross powder composite fuel is placed at room temperature for 5-8 hours, and the zinc dross powder composite fuel is packaged after being dried.
7. The method for preparing zinc dross powder composite fuel according to claim 6, further comprising one or more of the following:
the zinc slag raw material comprises more than or equal to 80% of Zn, and the balance of Fe and unavoidable impurities;
the atomization is started after zinc slag is completely melted for 5-10 min;
after the gas atomization is finished, continuously introducing argon into the furnace, wherein the pressure of the argon is 0.1-0.2 MPa, and stopping introducing the argon until the temperature of the zinc slag powder is reduced to below 50 ℃;
the zinc slag powder comprises more than or equal to 80% of Zn, the balance of Fe and unavoidable impurities, and is sieved to obtain 170-470 mu m zinc slag powder.
8. The method for preparing zinc dross powder composite fuel according to claim 6, further comprising one or more of the following:
the wetting agent is ethanol solution with the mass percentage of stearic acid or phenolic resin of 3-5%, the adding amount of the wetting agent is 1-2% of the weight of the zinc dross powder, the wetting agent is uniformly distributed on the surface of the zinc dross powder and is stirred by a stirrer for 10-20 min;
the purity of the iron powder is more than or equal to 97 percent of Fe, the C is less than 1.0 percent, and the balance is unavoidable impurities.
9. The method for preparing zinc dross powder composite fuel according to claim 6 or 7, wherein the particle size of the sieved zinc dross powder is 220-400 μm.
10. The method for preparing zinc dross powder composite fuel according to claim 6 or 8, wherein the particle size of the iron powder is less than 0.6 μm.
11. The method for preparing a zinc dross powder composite fuel according to claim 6 or 8, wherein the thickness of the iron powder layer on the surface of the zinc dross powder is not less than 14 μm.
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| AU2007322069B8 (en) * | 2006-11-17 | 2014-06-05 | Summerhill Biomass Systems, Inc. | Powdered fuels, dispersions thereof, and combustion devices related thereto |
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| CN114350422A (en) | 2022-04-15 |
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