CN108865316A - The preparation method of biomass fuel applied to agglomeration for iron mine - Google Patents

The preparation method of biomass fuel applied to agglomeration for iron mine Download PDF

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CN108865316A
CN108865316A CN201710900016.1A CN201710900016A CN108865316A CN 108865316 A CN108865316 A CN 108865316A CN 201710900016 A CN201710900016 A CN 201710900016A CN 108865316 A CN108865316 A CN 108865316A
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biomass
charing
biomass fuel
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CN108865316B (en
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刘超
张玉柱
赵凯
邢宏伟
康月
石焱
李�杰
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North China University of Science and Technology
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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
    • C10L5/442—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
    • 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
    • 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)
  • Life Sciences & Earth Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Ecology (AREA)
  • Forests & Forestry (AREA)
  • Wood Science & Technology (AREA)
  • Agronomy & Crop Science (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)

Abstract

The invention discloses a kind of preparation methods of biomass fuel applied to agglomeration for iron mine, include the following steps：Biomass is crushed, molding biomass is obtained；In a nitrogen environment, gained molding biomass is risen to 350~450 DEG C by room temperature with the heating rate of 5~10 DEG C/min；500~650 DEG C are warming up to the heating rate of 15~25 DEG C/min again, cooled to room temperature obtains charing biomass；Gained charing biomass is crushed, charing biological particles are obtained；The water that quality is 6~9wt% of the charing biological particles is uniformly sprayed on the charing biological particles, obtains infiltration charing biomass；Gained is infiltrated into charing biomass and CaO powder uniformly mixes, obtains biomass fuel.The present invention can not only make the performance indicators such as the fixed carbon content of biomass, reactivity and flammability be conducive to the generation of ferrous acid calcium phase close to coke powder, and in sintering process, improve sintering performance index.

Description

The preparation method of biomass fuel applied to agglomeration for iron mine
Technical field
The invention belongs to Ferrous Metallurgy sintering fuel technical fields, relate in particular to a kind of life applied to agglomeration for iron mine The preparation method of biomass fuel.
Background technique
In recent years, haze in all parts of the country takes place frequently, serious deterioration living environment, and life threatening health causes whole society's height Concern and worry.PM2.5 is haze weather " arch-criminal ", primary particulates and the SO such as including flue dust2、NOxEqual gaseous precursors object turns Secondary aerosol species made of change, difficulty of governance are big.China's steel and iron industry flowage structure is sintered cigarette based on blast furnace-converter process Pollutant sources and fuel combustion in sintering process are closely related in gas, 90% or more the NO generated in sintering processxIt is derived from Nitrogen-containing organic compound in fuel.SO in sintering flue gas2Source be mainly FeS in iron ore2Or the S in FeS, fuel Generation is reacted with oxygen, it is considered that S generates SO2Ratio can achieve 85%~95%.CO in sintering flue gasxDerived from sintering The burning of fuel.Therefore, to protect environment and comprehensive utilization of resources as starting point, the novel environment-friendly for replacing traditional fuel is developed Sintering fuel realizes that control sintering pollution source is most direct, the effective means for controlling Ore Sintering Process pollutant emission.
Biomass energy is reproducible clean energy resource, from a wealth of sources, and reserves are huge and can regenerate.Face mineral products money The increasingly deficient status in source seeks to adhere to that the strategy of sustainable development has become the world with circular economy, the ecological economy for guidance Common recognition bases oneself upon the height of protection mankind's natural resources and ecological environment, substantially effectively utilizes abundant, reproducible biomass Resource is very necessary.It is sintered using biomass energy Substitute coal quasi-fossil fuel, burn the CO generated2Participate in atmospheric carbon Circulation in addition the characteristics of the low S of biomass fuel, low N, thus can reduce sintering CO from source2、SO2、NOxGeneration.But by Cause combustion reaction too fast in biomass fuel is loose porous, and density is small, calorific value is low, and directly applying to agglomeration for iron mine can lead Flame front and heat wave leading peak rate travel is caused to mismatch, sinter bed temperature is low, finally influences sintered ore rotary drum strength, finished product The performance indicators such as rate.Biomass fuel should be handled by necessary technological means, its reactivity be reduced, before making flame Peak is matched with heat wave leading peak rate travel, is increased it and is fixed carbon content, improves fuel value.Currently, application No. is 201110180200.6 patent obtains the biomass carbon fuel of sintering, substitution is burnt by the way that biomass is carried out charing process The fossil energies such as powder, anthracite make sintering fuel, realize the clean manufacturing of agglomeration for iron mine；201110180196.3 biology of application number The preparation of matter shaped fuel is hot-forming under conditions of adding silica solution, calcium hydroxide, acquisition solid molding fuel.But Entire preparation method and application for the biomass fuel of sintering fill biomass fuel in particular with CaO powder Technique for packing is to inhibition NOxGeneration is rarely reported.
Summary of the invention
In view of the deficiencies of the prior art, the purpose of the present invention is to provide a kind of biomass fuels applied to agglomeration for iron mine Preparation method, which respectively forms biomass, is carbonized, CaO powder according to the requirement of agglomeration for iron mine fuel Filling package etc. reason solves loose porous biomass, large specific surface area, fixes the defects of carbon content is low, reaction is too fast, simultaneously Realize sintering production pollution reduction.
The purpose of the present invention is what is be achieved by following technical proposals.
A kind of preparation method of the biomass fuel applied to agglomeration for iron mine, includes the following steps：
1) biomass is crushed, so that the granularity of the biomass reaches 5~10mm, smashed biomass is carried out Formed at normal temp obtains molding biomass, wherein the pressure of the formed at normal temp is 20~50MPa；
In the step 1), the temperature of the formed at normal temp is 20~25 DEG C.
In the step 1), the time of the formed at normal temp is 50~90 seconds.
2) first stage carbonizes：In a nitrogen environment, by molding biomass obtained by step 1) with the heating of 5~10 DEG C/min Rate rises to 350~450 DEG C by room temperature；
In the step 2), the room temperature is 20~25 DEG C.
3) second stage carbonizes：In a nitrogen environment, by molding biomass obtained by step 2) again with 15~25 DEG C/min's Heating rate is warming up to 500~650 DEG C, and cooled to room temperature obtains charing biomass；
4) charing biomass obtained by step 3) is crushed, so that the granularity of the charing biomass reaches 2~5mm, is obtained To charing biological particles；It is 6~9wt% of the charing biological particles that quality is uniformly sprayed on the charing biological particles Water so that it is described charing biological particles surface infiltration, obtain infiltration charing biomass；
5) infiltration charing biomass and CaO powder obtained by step 4) are uniformly mixed, obtains biomass fuel, wherein institute The quality for stating CaO powder is the 10% of the quality that the infiltration carbonizes biomass.
In the step 5), the granularity of the CaO powder is less than or equal to 10 μm.
In the step 5), the infiltration charing biomass and CaO powder mixed uniformly time are 0.5~1min.
In the above-mentioned technical solutions, the biomass is sawdust, corn stover, bagasse or shell.
A kind of biomass fuel is obtained by above-mentioned preparation method.
In the above-mentioned technical solutions, the density of the biomass fuel is 1.56~1.75g/cm3, fixing carbon content is 82.5~87.2%.
Above-mentioned biomass fuel is preparing the application in iron ore, and the biomass fuel is uniformly mixed with coke powder, is obtained The biomass fuel coke powder mixture is uniformly mixed and is sintered with raw materials for sintering by biomass fuel coke powder mixture, Obtain iron ore, wherein the ratio of biomass fuel and coke powder mass fraction is (2~6)：(4~8).
Compared with the prior art, biomass fuel of the invention have the advantage that for：
1. forming processes (formed at normal temp) is carried out to biomass, after forming processes according to the loose porous feature of biomass The density of gained biomass fuel is increased to 1.56~1.75g/cm3, finer and close；
2. high for biomass volatile matter, the low feature of fixed carbon carries out charing modification to biomass, improves biomass Fixed carbon content, the fixed carbon content of gained biomass fuel is increased to 82.5%-87.2% after carbonizing, the fixed carbon with coke powder Content is suitable；
3. the volatile matter of biomass constantly removes due in carbonization process, it will lead to biomass porosity and increase, specific surface Product increases, and the CaO powder using partial size less than 10 μm is filled and wraps up, excessive air is isolated and contacts reaction, can make The reactivity of biomass fuel reduces, and slows down the burning velocity of biomass fuel；
4. being sintered production using biomass fuel substitution part coke powder of the invention, during the sintering process biomass fuel Material release heat passes to the CaO powder being attached on the biomass fuel first, so that CaO powder is sufficiently reacted with iron charge, Ferrous acid calcium phase is generated around fuel, guarantee inhibits NO while sintering mine performance intoxThe generation of pollutant.
The present invention forms biomass, carbonizes, after CaO powder filling package processing, then carrying out two with raw materials for sintering Secondary granulation is applied to sintering production, and the performance indicators such as the fixed carbon content of biomass, reactivity and flammability can not only be made close Coke powder, and be conducive to the generation of ferrous acid calcium phase in sintering process, improve sintering performance index, and can reduce pollutant SO2And NOxDischarge amount.Biomass fuel of the invention meets the requirement of agglomeration for iron mine clean manufacturing, has preferable economic effect Benefit, social benefit and environmental benefit, meet the fundamental policies system of national energy conservation and emission reduction and comprehensive utilization of resources.
Specific embodiment
The preparation of the biomass fuel applied to agglomeration for iron mine of the invention is further illustrated combined with specific embodiments below Method.
In a specific embodiment of the invention, technology is sintered to biomass fuel using the experiment of laboratory sintered cup Index test and sintering flue gas SO2And NOxContent detection, the size of laboratory sintered cup are Φ 200mm × 720mm；Sintering ignition Negative pressure is 8kPa, suction pressure 12kPa.
CaO powder purchase is greater than 96% from Tianjin Yong great chemical reagent Co., Ltd, purity, and the granularity of CaO powder is small In 10 μm.
Following embodiment steps 2) and step 3) in nitrogen flow be 1L/min.
Coke powder is bought from Xishan coal electricity company.
Raw materials for sintering is derived from sintering feed factory of Tang Gang company of He Gang group, raw materials for sintering mainly by the iron charge of 83.86wt%, The dolomite of the lime stone of 3.00wt%, the lime of 3.84wt% and 4.81wt% forms, and forms each raw material of raw materials for sintering Main chemical compositions be shown in Table 1.
Table 1 is raw materials for sintering main chemical compositions
Embodiment 1
A kind of preparation method of the biomass fuel applied to agglomeration for iron mine, includes the following steps：
1) sawdust is chosen as biomass, biomass is crushed, so that the granularity of the biomass reaches 5~10mm (or if sawdust granularity is smaller, not needing pulverization process) carries out formed at normal temp (temperature 20 to smashed biomass ~25 DEG C), obtain molding biomass, wherein the pressure of formed at normal temp is 30MPa, and the time of formed at normal temp is 60 seconds.
2) first stage carbonizes：In a nitrogen environment, biomass will be formed obtained by step 1) using controlled atmosphere resistance furnace 400 DEG C are risen to by 20~25 DEG C of room temperature with the heating rate of 5 DEG C/min；
3) second stage carbonizes：In a nitrogen environment, biomass will be formed obtained by step 2) using controlled atmosphere resistance furnace 600 DEG C are warming up to the heating rate of 20 DEG C/min again, cooled to room temperature obtains charing biomass；
4) charing biomass obtained by step 3) is crushed, so that the granularity of the charing biomass reaches 2~5mm, is obtained To charing biological particles；Charing biological particles are put into disk blender, are uniformly sprayed on charing biological particles Quality is the water of charing biological particles 6wt%, so that the surface infiltration of charing biological particles, obtains infiltration charing biology Matter；
5) infiltration charing biomass and CaO powder obtained by step 4) are uniformly mixed, obtains biomass fuel, wherein The even mixed time is 0.5min, and the quality of CaO powder is the 10% of the quality of infiltration charing biomass.
Embodiment 2
A kind of preparation method of the biomass fuel applied to agglomeration for iron mine, includes the following steps：
1) choose corn stover as biomass, biomass crushed so that the granularity of the biomass reach 5~ 10mm carries out formed at normal temp (temperature be 20~25 DEG C) to smashed biomass, obtains molding biomass, wherein room temperature at The pressure of type is 50MPa, and the time of formed at normal temp is 60 seconds.
2) first stage carbonizes：In a nitrogen environment, biomass will be formed obtained by step 1) using controlled atmosphere resistance furnace 350 DEG C are risen to by 20~25 DEG C of room temperature with the heating rate of 10 DEG C/min；
3) second stage carbonizes：In a nitrogen environment, biomass will be formed obtained by step 2) using controlled atmosphere resistance furnace 500 DEG C are warming up to the heating rate of 20 DEG C/min again, cooled to room temperature obtains charing biomass；
4) charing biomass obtained by step 3) is crushed, so that the granularity of the charing biomass reaches 2~5mm, is obtained To charing biological particles；Charing biological particles are put into disk blender, are uniformly sprayed on charing biological particles Quality is the water of charing biological particles 6wt%, so that the surface infiltration of charing biological particles, obtains infiltration charing biology Matter；
5) infiltration charing biomass and CaO powder obtained by step 4) are uniformly mixed, obtains biomass fuel, wherein The even mixed time is 0.5min, and the quality of CaO powder is the 10% of the quality of infiltration charing biomass.
Embodiment 3
A kind of preparation method of the biomass fuel applied to agglomeration for iron mine, includes the following steps：
1) choose shell ((mixture of sunflower seeds, pine nut and peanut shell) be used as biomass, biomass is crushed, So that the granularity of the biomass reaches 5~10mm (the shell granularity as chosen is smaller, then does not need break process), after crushing Biomass carry out formed at normal temp (temperature be 20~25 DEG C), obtain molding biomass, wherein the pressure of formed at normal temp is 40MPa, the time of formed at normal temp are 60 seconds.
2) first stage carbonizes：In a nitrogen environment (as protective gas), using controlled atmosphere resistance furnace by step 1) Gained forms biomass and rises to 400 DEG C by 20~25 DEG C of room temperature with the heating rate of 5 DEG C/min；
3) second stage carbonizes：In a nitrogen environment, biomass will be formed obtained by step 2) using controlled atmosphere resistance furnace 600 DEG C are warming up to the heating rate of 20 DEG C/min again, cooled to room temperature obtains charing biomass；
4) charing biomass obtained by step 3) is crushed, so that the granularity of the charing biomass reaches 2~5mm, is obtained To charing biological particles；Charing biological particles are put into disk blender, are uniformly sprayed on charing biological particles Quality is the water of charing biological particles 6wt%, so that the surface infiltration of charing biological particles, obtains infiltration charing biology Matter；
5) infiltration charing biomass and CaO powder obtained by step 4) are uniformly mixed, obtains biomass fuel, wherein The even mixed time is 0.5min, and the quality of CaO powder is the 10% of the quality of infiltration charing biomass.
1~3 gained biomass fuel of above-described embodiment and coke powder are put into blender and uniformly mixed, biomass fuel is obtained Biomass fuel coke powder mixture is uniformly mixed and is sintered with raw materials for sintering, obtains iron ore by coke powder mixture, wherein Biomass fuel coke powder mixture provides heat for raw materials for sintering, and the ratio of biomass fuel and coke powder mass fraction is respectively 1:4, 2:3 and 3:2, the ratio of the quality of the quality and raw materials for sintering of biomass fuel coke powder mixture is 4.5wt%.According to following specific Performance test methods are tested, and test result is as shown in table 2.
Specific performance test method is as follows：
(1) vertical sintering speed：Biomass fuel coke powder mixture is vertically sintered the degree of speed, is (biomass fuel Coke powder mixture) bed depth and sintering time ratio：
In formula：C-vertical sintering speed, mm/min；
H-sinter bed height, mm；
T-sintering time, min.
(2) burn out rate：Biomass fuel coke powder mixture loses after (1200-1400) DEG C calcination under sintering state high temperature Quality divided by biomass fuel coke powder mixture quality before being sintered percentage.
In formula：W1The quality of the biomass fuel coke powder mixture in sintered cup, kg are packed into before-sintering；
W2The quality of sinter cake (i.e. iron ore, the grate-layer material be free of) after-sintering in sintered cup, kg.
(3) yield rate：Sinter (sinter cake, iron ore) is subjected to shatter test three times in the falling device of 2m high, is passed through Broken rear sinter of the granularity greater than 5mm is defined as finished product sinter by screening.
In formula：G-finished product sinter quality, kg；
W2The quality (being free of grate-layer material) of-sinter cake, kg.
(4) drum strength：Granularity is greater than to the sinter curtailed sampling of 10mm, using 87 rotary drum of GB8209-, is carried out strong Index (tumbler index and anti-wear index) is spent to examine.(chinese national standard GB8209-87 define sinter and pellet The measuring method of drum strength, with the rotary drum of ф 1000mm × 500mm, sample size 15kg, with the revolving speed of 25r/min in drum inward turning Turn 200 turns, to be greater than the mass percent of 6.3mm grade after turning as tumbler index, i.e. drum strength.)
In formula：m0- enter the quality of bulging sample (sinter), kg；
m1It is greater than the quality of 6.3mm (+6.3mm) grade, kg after-rotary drum；
(5) SO in sintering flue gas2And NOxPollutant monitoring：Using the flue gas inspection instrument of model GH-60E at sintered cup bottom Smoke components are tested in portion's exhaust pipe, the emission reduction of sintering flue gas pollutant is obtained by comparative experiments.
In formula：SO in R-flue gas2Or NOxEmission reduction, %；
Q0SO in-normal sintering2Or NOxContent, mg/m3；
Qn- utilize SO in biomass fuel sintering2Or NOxContent, mg/m3。
Sintering technology index under the different biomass fuel substitution ratios of table 2
Biomass fuel density is small, and fixed carbon content is low directly to be used in sintering production, its is modified Biomass fuel density is increased to 1.56~1.75g/cm3, fixed carbon content is 82.5~87.2%.Modified biomass fuel Reactivity and combustibility it is better than coke powder, therefore add plus biomass fuel after, the vertical combustion speed of sintering becomes faster, and with The additive amount of biomass fuel increase and accelerate, sintering process shortens, and is conducive to raising sintering rate, but with biomass The lasting addition of fuel, combustion front velocity are persistently accelerated, cause it is unbalance with heat front velocity, sintered ore rotary drum strength and at Product rate is in decreasing trend, should be properly added biomass fuel.S and N content are below coke powder in biomass fuel, sintered With the increase of biomass fuel in journey, SO2 and NOx content in flue gas are also decreased, and should improve biomass fuel as far as possible Part substitution coke powder is sintered, and reduces sintering flue gas pollutant discharge, comprehensive sintering production indices quality and pollutant Emission reduction situation, additive amount of the modified biomass fuel in sintering production can be increased to 40% or more.
Illustrative description has been done to the present invention above, it should explanation, the case where not departing from core of the invention Under, any simple deformation, modification or other skilled in the art can not spend the equivalent replacement of creative work equal Fall into protection scope of the present invention.

Claims (10)

1. a kind of preparation method of the biomass fuel applied to agglomeration for iron mine, which is characterized in that include the following steps：
1) biomass is carried out being crushed to granularity being 5~10mm, formed at normal temp is carried out to smashed biomass, obtains molding life Substance, wherein the pressure of the formed at normal temp is 20~50MPa；
2) first stage carbonizes：In a nitrogen environment, by molding biomass obtained by step 1) with the heating rate of 5~10 DEG C/min 350~450 DEG C are risen to by room temperature；
3) second stage carbonizes：In a nitrogen environment, by molding biomass obtained by step 2) again with the heating of 15~25 DEG C/min Rate is warming up to 500~650 DEG C, and cooled to room temperature obtains charing biomass；
4) charing biomass obtained by step 3) is crushed, so that the granularity of the charing biomass reaches 2~5mm, obtains charcoal Metaplasia material grains；Uniformly spraying quality on the charing biological particles is 6~9wt%'s of the charing biological particles Water, so that the surface infiltration of the charing biological particles, obtains infiltration charing biomass；
5) infiltration charing biomass and CaO powder obtained by step 4) are uniformly mixed, obtains biomass fuel, wherein the CaO The quality of powder is the 10% of the quality of the infiltration charing biomass.
2. preparation method according to claim 1, which is characterized in that in the step 1), the temperature of the formed at normal temp Degree is 20~25 DEG C.
3. preparation method according to claim 2, which is characterized in that in the step 1), the formed at normal temp when Between be 50~90 seconds.
4. preparation method according to claim 3, which is characterized in that in the step 2), the room temperature is 20~25 ℃。
5. the preparation method according to claim 4, which is characterized in that in the step 5), the granularity of the CaO powder ≤10μm。
6. preparation method according to claim 5, which is characterized in that in the step 5), the infiltration charing biology Matter and CaO powder mixed uniformly time are 0.5min.
7. preparation method according to claim 6, which is characterized in that the biomass is sawdust, corn stover, bagasse Or shell.
8. the biomass fuel that the preparation method as described in claim 1~7 any one obtains.
9. biomass fuel according to claim 8, which is characterized in that the density of the biomass fuel be 1.56~ 1.75g/cm3, fixed carbon content is 82.5~87.2%.
10. biomass fuel is preparing the application in iron ore as described in claim 8 or 9, which is characterized in that by the biomass Fuel is uniformly mixed with coke powder, obtains biomass fuel coke powder mixture, by the biomass fuel coke powder mixture and sintering Raw material is uniformly mixed and is sintered, and obtains iron ore, wherein the ratio of biomass fuel and coke powder mass fraction is (2~6)：(4 ~8).
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