CN110699142B - Iron ore sintering biomass fuel and preparation method and application thereof - Google Patents

Iron ore sintering biomass fuel and preparation method and application thereof Download PDF

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CN110699142B
CN110699142B CN201910957859.4A CN201910957859A CN110699142B CN 110699142 B CN110699142 B CN 110699142B CN 201910957859 A CN201910957859 A CN 201910957859A CN 110699142 B CN110699142 B CN 110699142B
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biomass
iron ore
fuel
tailing slag
sintering
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CN110699142A (en
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季志云
范晓慧
甘敏
李浩锐
倪佳苗
陈许玲
黄晓贤
袁礼顺
黄斌斌
武钰峰
吕薇
唐庆余
汪国靖
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Central South University
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L5/00—Solid fuels
    • C10L5/40—Solid fuels essentially based on materials of non-mineral origin
    • C10L5/44—Solid fuels essentially based on materials of non-mineral origin on vegetable substances
    • C10L5/445—Agricultural waste, e.g. corn crops, grass clippings, nut shells or oil pressing residues
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L5/00—Solid fuels
    • C10L5/40—Solid fuels essentially based on materials of non-mineral origin
    • C10L5/44—Solid fuels essentially based on materials of non-mineral origin on vegetable substances
    • C10L5/442—Wood or forestry waste
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L9/00—Treating solid fuels to improve their combustion
    • C10L9/10—Treating solid fuels to improve their combustion by using additives
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/10—Biofuels, e.g. bio-diesel
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel

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  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Combustion & Propulsion (AREA)
  • Ecology (AREA)
  • Forests & Forestry (AREA)
  • Wood Science & Technology (AREA)
  • Agronomy & Crop Science (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The invention discloses an iron ore sintering biomass fuel, and a preparation method and application thereof. The method is to mix the biomass powder with iron-dressing tailing slag-silica tailing slagAfter the mixed powder is uniformly mixed, pressing the mixed powder into biomass particles; the biomass particles are sequentially subjected to low-temperature pretreatment and high-temperature carbonization treatment under a protective atmosphere to obtain the biomass particles with the heat value of 26-33 MJ/kg, the volatile component of 0.5-3% and the specific surface area of 10-25 m2A porosity of 15-25%, and an apparent density of 1.5-2.2 g/cm3The high-quality biomass fuel fully utilizes the inert component SiO in the slag2The comprehensive effect of the thermochemical reaction activity of the biomass fuel and the promotion of the high-efficiency cracking of volatile matters by the iron oxide is weakened, the biomass fuel of fossil fuel can be replaced at a high proportion, and the high-efficiency emission reduction of SOx, NOx and CO from the source is realized2。

Description

Iron ore sintering biomass fuel and preparation method and application thereof
Technical Field
The invention relates to a biomass sintering fuel, in particular to an iron ore sintering fuel prepared by utilizing tailing slag and waste biomass for cooperative recycling and a method thereof, and also relates to a method for replacing fossil fuel with the biomass sintering fuel to realize emission reduction, belonging to the technical field of sintering in the field of ferrous metallurgy.
Background
In the production process of iron and steel enterprises, the energy consumption of a sintering process accounts for about 10% of the total energy consumption, wherein the consumption of solid fuel accounts for about 80% of the process energy consumption. The solid fuel consumed by the traditional sintering is mainly anthracite powder and pulverized coke powder. At present, the world energy form is increasingly severe, the price of fossil fuel is continuously increased, and the sintering cost is high; while combustion of fossil fuels produces large amounts of NOXSOx and CO2The environmental pollution problem is becoming more serious. According to the 2019 ultra-low emission requirement of the steel sintering flue gas, the hourly average values of the emission concentrations of the particulate matters, the sulfur dioxide and the nitrogen oxides in the head flue gas of the sintering machine are respectively not higher than 10, 35 and 50mg/m3And the average hourly discharge concentration of at least more than 95 percent of the period per month of the iron and steel enterprises with ultralow discharge meets the indexes. But at present, NOx and SO in sintering flue gas2The average discharge concentration exceeds 200mg/m3There is a large gap with the requirement for ultra-low emissions.
The biomass energy is a general term of organic combustible generated by plants through photosynthesis, has low sulfur and nitrogen contents, absorbs carbon dioxide in the growing process and discharges carbon dioxide in the combustion process approximately equal, and is clean and renewable energy. It is estimated that about 1600 million tons of biomass is produced by photosynthesis on earth every year, and the abundantly usable parts include agricultural and forestry surplus waste, forestry waste, and processing waste, etc., and the energy contained in these solid wastes is about 5 times of the total energy consumption in the world at present, but only a small part is used. If the part of energy can be utilized in the steel sintering process, the pollutant emission of the sintering process can be greatly reduced.
Scholars at home and abroad carry out a great deal of research work on the feasibility of using biomass fuel to replace fossil fuel for sintering, and the fact that the activity of the thermochemical reaction of the biomass fuel is obviously higher than that of the fossil fuel is relatively consistently found, when the proportion of the replaced coke powder exceeds 20%, the matching between the heat transfer front and the combustion front speed can be damaged, the highest temperature of a sinter bed is reduced, the high-temperature retention time is shortened, and the strength of sinter is reduced, and the yield is reduced. Because the biomass has high reaction activity, insufficient combustion is aggravated, and part of the biomass can also react prematurely to generate CO which enters the flue gas; the biomass fuel prepared by the conventional method has high volatile content, but when the combustion front reaches, the biomass fuel is pyrolyzed and enters flue gas, so that a large amount of heat is wasted, and secondary pollution is generated.
Disclosure of Invention
The method aims at the defect that the reactivity difference between the biomass fuel for iron ore sintering and fossil fuel in the prior art is large in the pyrolysis process, so that fuel combustion is not synchronous in the sintering process. The invention aims to provide a biomass fuel with compact structure, low volatile content and low thermochemical reaction activity, which is particularly suitable for the sintering process of iron ores and can greatly improve the replacement proportion of fossil fuels.
The second purpose of the invention is to provide a method for preparing biomass sintering biomass fuel by using the cooperation of tailing slag and waste biomass, the method has simple steps, the raw material is derived from waste, and the resource utilization of solid waste is really realized.
The third purpose of the invention is to provide an application of the biomass sintering fuel in iron ore sintering, wherein the biomass sintering fuel can replace fossil fuel at a high ratio, the pollutant emission of sintering flue gas is greatly reduced, and the sintering cost is reduced.
In order to realize the technical purpose, the invention provides a method for preparing iron ore sintering biomass fuel by synergistic recycling of tailing slag and waste biomass, which is characterized in that biomass powder and mixed powder of iron-selecting tailing slag-silica tailing slag are uniformly mixed and pressed into biomass particles; and sequentially carrying out low-temperature pretreatment and high-temperature carbonization treatment on the biomass particles in a protective atmosphere to obtain the biomass particle.
Preferably, the biomass comprises at least one of agricultural waste, forestry processing waste, hard fruit pits and fruit shells.
Preferably, the main component of the mixed powder of iron-dressing tailings and silica tailings is SiO2And iron oxides; the main components by mass percentage are as follows: 60-80% of silicon dioxide and 20-40% of ferric oxide. The iron separation tailing slag is tailing after natural iron ore separation. Silica tailings are tailings after silica beneficiation.
According to the preferable scheme, the biomass powder and the iron-dressing tailing slag-silica tailing slag mixed powder are 96-99.5% by mass: 0.5-4%. The invention will be rich in SiO2The inert fine SiO is introduced into the biomass fuel by the tailing slag2The particles occupy the active sites of the biomass fuel, reduce the thermochemical reaction activity of the biomass fuel, and have SiO with a Si-O tetrahedral structure2And a stable network structure can be formed with the C-C chain, so that the difference of the reactivity of the biomass fuel and the fossil fuel is reduced. According to the invention, the iron oxide component is introduced to prepare the biomass fuel, and the organic component in the biomass can be catalyzed and cracked into micromolecular gas in the carbonization process, so that the damage effect of the gas removed by macromolecules in the conventional carbonization process on the structure of the biomass fuel can be reduced, the deep removal of the catalyzed organic component is facilitated, and the high organic component of the biomass fuel prepared by the conventional method is avoided, so that the biomass fuel is directly decomposed into flue gas in a sintering unburnt layer to cause energy waste.
In a preferable scheme, the mass percentage of the biomass powder in the size fraction of 0.1-1 mm is not less than 80%.
Preferably, the particle size of the iron-selecting tailing slag-silica tailing slag mixed powder meets the mass percentage content of 0-0.01 mm (less than or equal to 0.01 mm) particle size not less than 90%.
Preferably, the pressing process: the molding is assisted by a mold, and the pressure is 300-1000 kg/cm3The time is 0.5-2.5 min, the temperature range of the die is room temperature-150 ℃, and the particle size of the press forming is 3-5 mm. The mold of the invention is a temperature-controllable stainless steel mold.
Preferably, the low-temperature pretreatment process comprises: heating to 200-300 ℃ at a heating rate of 15-25 ℃/min, and preserving heat for 30-60 min. The low temperature pretreatment process is primarily to remove most of the volatiles by low temperature. The biomass fuel is pretreated at a lower temperature to slowly remove most of volatile components, so that the damage of the organic matters directly entering a high-temperature process and violently decomposing to the particle structure of the formed biomass can be effectively reduced, and the subsequent high-temperature carbonization process is facilitated to form the high-quality biomass fuel with compact structure, low volatile components and high heat value.
In a preferred scheme, the high-temperature carbonization treatment process comprises the following steps: heating to 600-800 ℃ at a heating rate of 2-8 ℃/min, and preserving the heat for 15-30 min. The high-temperature carbonization process mainly realizes the carbonization and transformation process of the biomass. On the basis of the low-temperature pretreatment process, in the fine carbonization process of the high-temperature stage, the volatile matter is deeply removed along the cavity remained by devolatilization in the low-temperature stage, so that the structure of the generated carbon material can be ensured not to be damaged. And most of volatile components are removed in the low-temperature pretreatment process, so that the retention time in the high-temperature carbonization process can be effectively shortened, and the energy consumption in the whole carbonization process can be reduced.
Preferably, the protective atmosphere is N in volume ratio280-90% of Ar 10-20%, and the total gas flow is 0.05-0.3L/min.
The invention also provides an iron ore sintering biomass fuel which is obtained by the preparation method.
Preferably, the combustion heat value of the iron ore sintering fuel is 26-33 MJ/kg, the volatile component is 0.5-3%, and the specific surface area is 10-25 m2A porosity of 15-25%, and an apparent density of 1.5-2.2 g/cm3。
The invention also provides an application of the iron ore sintering biomass fuel, which is used for iron ore sintering instead of fossil fuel.
In the preferable scheme, 40-70% of fossil fuel is replaced by the fixed carbon content for iron ore sintering.
The invention replaces fossil fuel with fixed carbon content such as prepared iron ore sintering fuel, mixes and granulates the iron ore, fusing agent and return mine, and then distributes the mixture on a sintering trolley for ignition and sintering.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, the biomass is treated by two different carbonization processes, and the biomass fuel is pretreated at a lower temperature so that most of volatile components are slowly removed, so that the damage of the organic matters directly entering a high-temperature process and violently decomposed to the particle structure of the formed biomass can be effectively reduced; when entering the fine carbonization process of the high-temperature stage, the volatile components are deeply removed along the residual holes in the devolatilization at the low-temperature stage, so that the high-quality biomass fuel with compact structure, low volatile components and high heat value is prepared; most of volatile components are removed in the low-temperature pretreatment process, so that the retention time of the high-temperature carbonization process can be effectively shortened, and the energy consumption of the whole carbonization process can be reduced.
(2) The invention is rich in SiO in the preparation process of the biomass fuel2The inert fine SiO is fully dispersed in the biomass fuel2On one hand, the particles occupy the active sites of the biomass fuel and reduce the thermochemical reaction activity of the biomass fuel, and on the other hand, the particles have SiO with a Si-O tetrahedral structure2And a stable network structure can be formed with the C-C chain, so that the difference of the reactivity of the biomass fuel and the fossil fuel is further reduced.
(3) The iron oxide component in the tailing slag can catalyze the organic component in the biomass to be cracked into micromolecular gas in the carbonization process, so that the damage effect of the gas removed by macromolecules in the conventional carbonization process on the structure of the biomass fuel is reduced, the deep removal of the catalytic organic component is facilitated, the high organic component of the biomass fuel prepared by the conventional method is avoided, the biomass fuel is unburned in a sintering material layer and is directly decomposed to enter smoke gas to cause energy waste, and valuable iron oxide finally enters sintering ore in the sintering process and is recovered in the subsequent smelting process.
According to the invention, the waste biomass and the tailing slag are used as raw materials, the high-quality biomass fuel with smaller quality and performance difference with the conventional fossil fuel is prepared by regulating and controlling the preparation process, and 40-70% of fossil fuel is successfully replaced by the biomass fuel for iron ore sintering while the synergistic resource utilization of the two types of solid wastes is realized, so that the iron ore sintering efficiency is effectively reducedReduces SOx, NOx and CO in the sintering flue gas2The discharge of the sintering furnace has important significance for sintering clean production.
Detailed Description
In order to facilitate an understanding of the present invention, the present invention will be described more fully and in detail with reference to the preferred embodiments, but the scope of the present invention is not limited to the specific embodiments described below.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Unless otherwise specified, the reagents and materials used in the present invention are commercially available products or products obtained by a known method.
Example 1
Mixing cotton straw with iron-dressing tailing slag and silica tailing Slag (SiO)2 70％、Fe2O330%) are respectively ground to 0.2-0.6 mm and 0-0.005 mm, and are respectively mixed uniformly according to the mass percentage of 99% and 1%, and then the mixture is mechanically pressed to 400kg/cm3And compressing the mixed biomass into biomass particles for 0.5min at room temperature. Heating the particles to 200 deg.C at a heating rate of 20 deg.C/min, standing for 30min to complete low temperature pretreatment, heating the particles to 600 deg.C at a heating rate of 5 deg.C/min, standing for 15min, and maintaining the atmosphere in carbonization process at N285 percent, Ar 15 percent and gas flow rate of 0.05L/min. The prepared biomass has the combustion heat value of 27MJ/kg, the volatile component of 2.0 percent and the specific surface area of 20m2A porosity of 19% and an apparent density of 1.7g/cm3. The coke powder with the fixed carbon content replacing 40 percent is used for iron ore sintering, so that the sintering index (shown in table 1) equivalent to that when the coke powder is completely adopted can be obtained, and SOx, NOx and CO are realized2Respectively reducing emission by 36 percent, 33 percent and 38 percent.
Example 2
Mixing cotton straw with iron-dressing tailing slag and silica tailing Slag (SiO)2 60％、Fe2O340%) of the raw materials are respectively ground to 0.2-0.6 mm and 0-0.005 mm, the raw materials are respectively mixed uniformly according to the mass percent of 98.5% and 1.5%, and then the mixture is mechanically pressed to 500kg/cm3Compressing the mixed biomass into biomass particles under the conditions of 1min of compression time and 70 ℃ of compression temperature. Heating the particles to 250 deg.C at a temperature rise rate of 15 deg.C/min, standing for 40min to complete low temperature pretreatment, heating the particles to 650 deg.C at a temperature rise rate of 4 deg.C/min, standing for 20min, and maintaining the atmosphere in carbonization process at N285 percent, Ar 15 percent and gas flow rate of 0.05L/min. The prepared biomass has the combustion heat value of 28MJ/kg, the volatile component of 1.5 percent and the specific surface area of 17m2A porosity of 16% and an apparent density of 1.85g/cm3. When the coke powder with the fixed carbon content replacing 50 percent is used for iron ore sintering, the sintering index (shown in table 1) equivalent to that when the coke powder is completely adopted can be obtained, and SOx, NOx and CO are realized2Respectively reduce emission by 47 percent, 45 percent and 53 percent.
Example 3
Mixing cotton straw with iron-dressing tailing slag and silica tailing Slag (SiO)2 80％、Fe2O320%) of the raw materials are respectively ground to 0.2-0.6 mm and 0-0.005 mm, the mixture is uniformly mixed according to the mass percent of 98% and 2%, and then the mixture is mechanically pressed to 600kg/cm3Compressing the mixed biomass into biomass particles under the conditions of 1min of compression time and 70 ℃ of compression temperature. Heating the particles to 250 deg.C at a heating rate of 15 deg.C/min, standing for 40min to complete low temperature pretreatment, heating the particles to 700 deg.C at a heating rate of 3 deg.C/min, standing for 25min, and maintaining the atmosphere in carbonization process at N285 percent, Ar 15 percent and gas flow rate of 0.05L/min. The prepared biomass has the combustion heat value of 30MJ/kg, the volatile component of 1.2 percent and the specific surface area of 15m2A porosity of 14%, an apparent density of 2.0g/cm3. When the coke powder with the fixed carbon content replacing 55 percent is used for iron ore sintering, the sintering index (shown in table 1) which is equivalent to that when the coke powder is completely adopted can be obtained, and SOx, NOx and CO are realized2Respectively reducing emission by 53 percent, 47 percent and 57 percent.
TABLE 1 influence of biomass substitution for fossil fuels on sintering index
Figure BDA0002227946500000061
Comparative example 1
Grinding cotton straws to 0.2-0.6 mm, and then mechanically pressing at 400kg/cm3Compressing the mixed biomass into biomass particles for 0.5min at room temperature, heating to 600 deg.C at a temperature rise rate of 5 deg.C/min, standing for 15min, and maintaining the atmosphere in carbonization process at N285 percent, Ar 15 percent and gas flow rate of 0.05L/min. The prepared biomass has the combustion heat value of 24MJ/kg, the volatile component of 8.0 percent and the specific surface area of 36m2(ii) a porosity of 33% and an apparent density of 1.35g/cm3. The sintering index of the iron ore sintered using the coke powder having a fixed carbon content of 40% instead of the fixed carbon content is shown in table 2.
Comparative example 2
Selecting Slag (SiO) from cotton straw and single silica2Content 60%) of the raw materials are respectively ground into 0.2-0.6 mm and 0-0.005 mm, the raw materials are respectively mixed uniformly according to the mass percent of 99% and 1%, and then the mixture is mechanically pressed at 400kg/cm3And compressing the mixed biomass into biomass particles for 0.5min at room temperature. Heating the particles to 200 deg.C at a heating rate of 20 deg.C/min, standing for 30min to complete low temperature pretreatment, heating the particles to 600 deg.C at a heating rate of 5 deg.C/min, standing for 15min, and maintaining the atmosphere in carbonization process at N285 percent, Ar 15 percent and gas flow rate of 0.05L/min. The prepared biomass has the combustion heat value of 25MJ/kg, the volatile component of 5.5 percent and the specific surface area of 28m2G, porosity of 33%, apparent density of 1.5g/cm3. The sintering index obtained by using the coke powder with the fixed carbon content instead of 40% for iron ore sintering is shown in table 2.
Comparative example 3
Separating slag (Fe) from cotton straw and single iron ore2O347 percent) of the raw materials are respectively ground into 0.2-0.6 mm and 0-0.005 mm and mixed according to the mass percent of 99 percent and 1 percentHomogenized and then mechanically pressed at a pressure of 400kg/cm3And compressing the mixed biomass into biomass particles for 0.5min at room temperature. Heating the particles to 200 deg.C at a heating rate of 20 deg.C/min, standing for 30min to complete low temperature pretreatment, heating the particles to 600 deg.C at a heating rate of 5 deg.C/min, standing for 15min, and maintaining the atmosphere in carbonization process at N285 percent, Ar 15 percent and gas flow rate of 0.05L/min. The prepared biomass has the combustion heat value of 24.3MJ/kg, the volatile component of 6.3 percent and the specific surface area of 31m2A porosity of 35% and an apparent density of 1.43g/cm3. The sintering index obtained by using the coke powder with the fixed carbon content instead of 40% for iron ore sintering is shown in table 2.
TABLE 2 influence of biomass substitution for fossil fuels on sintering index
Figure BDA0002227946500000071

Claims (8)

1. A method for preparing iron ore sintering biomass fuel by synergistic recycling of tailing slag and waste biomass is characterized by comprising the following steps: uniformly mixing biomass powder and iron-dressing tailing slag-silica tailing slag mixed powder, and pressing into biomass particles; sequentially carrying out low-temperature pretreatment and high-temperature carbonization treatment on the biomass particles in a protective atmosphere to obtain the biomass particles;
the iron-selecting tailing slag-silica tailing slag mixed powder comprises the following main components in percentage by mass: 60-80% of silicon dioxide and 20-40% of ferric oxide;
the mass percentage of the biomass powder to the mixed powder of the iron-selecting tailing slag and the silica tailing slag is 96-99.5%: 0.5-4%;
the low-temperature pretreatment process comprises the following steps: heating to 200-300 deg.C at a rate of 15-25 deg.C/minoC, preserving heat for 30-60 min;
the high-temperature carbonization treatment process comprises the following steps: heating to 600-800 deg.C at a rate of 2-8 deg.C/minoAnd C, preserving the heat for 15-30 min.
2. The method for preparing the iron ore sintering biomass fuel by the synergistic recycling of the tailing slag and the waste biomass as claimed in claim 1, wherein the method comprises the following steps: the biomass comprises at least one of agricultural wastes and forestry processing wastes.
3. The method for preparing the iron ore sintering biomass fuel by the synergistic recycling of the tailing slag and the waste biomass as claimed in claim 1, wherein the method comprises the following steps:
the particle size of the biomass powder meets the mass percentage content of 0.1-1 mm particle size not less than 80%;
the particle size of the iron-selecting tailing slag-silica tailing slag mixed powder meets the mass percentage content of 0-0.01 mm particle size not less than 90%.
4. The method for preparing the iron ore sintering biomass fuel by the synergistic recycling of the tailing slag and the waste biomass as claimed in claim 1, wherein the method comprises the following steps: the pressing process comprises the following steps: the molding is assisted by a mold, and the pressure is 300-1000 kg/cm3The time is 0.5-2.5 min, and the temperature of the die ranges from room temperature to 150 DEG CoAnd C, pressing and forming the particles to be 3-5 mm in size.
5. The iron ore sintering biomass fuel is characterized in that: the preparation method of any one of claims 1 to 4.
6. The iron ore sintering biomass fuel according to claim 5, characterized in that: the combustion heat value of the iron ore sintering fuel is 26-33 MJ/kg, the volatile component is 0.5-3%, and the specific surface area is 10-25 m2A porosity of 15-25%, and an apparent density of 1.5-2.2 g/cm3。
7. The use of the iron ore sintering biomass fuel according to claim 5 or 6, characterized in that: replacing fossil fuels for iron ore sintering.
8. The use of the iron ore sintering biomass fuel according to claim 7, characterized in that: and replacing 40-70% of fossil fuel with constant carbon content for sintering iron ore.
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