CN115029169A - Preparation method of sintered solid fuel - Google Patents
Preparation method of sintered solid fuel Download PDFInfo
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- CN115029169A CN115029169A CN202210461433.1A CN202210461433A CN115029169A CN 115029169 A CN115029169 A CN 115029169A CN 202210461433 A CN202210461433 A CN 202210461433A CN 115029169 A CN115029169 A CN 115029169A
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- 239000004449 solid propellant Substances 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 238000002156 mixing Methods 0.000 claims abstract description 58
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 44
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 43
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 37
- 239000002131 composite material Substances 0.000 claims abstract description 26
- 239000002893 slag Substances 0.000 claims abstract description 25
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 17
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 17
- 229910052751 metal Inorganic materials 0.000 claims abstract description 16
- 239000002184 metal Substances 0.000 claims abstract description 16
- 238000012216 screening Methods 0.000 claims abstract description 16
- 239000011273 tar residue Substances 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 238000000465 moulding Methods 0.000 claims abstract description 13
- 238000003825 pressing Methods 0.000 claims abstract description 3
- 239000002245 particle Substances 0.000 claims description 24
- 239000000203 mixture Substances 0.000 claims description 21
- 239000000571 coke Substances 0.000 claims description 17
- 238000011068 loading method Methods 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 15
- 229910052742 iron Inorganic materials 0.000 claims description 13
- 238000011049 filling Methods 0.000 claims description 11
- 239000002699 waste material Substances 0.000 claims description 10
- 238000004939 coking Methods 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 9
- 239000010881 fly ash Substances 0.000 claims description 8
- 239000004484 Briquette Substances 0.000 claims description 7
- 239000010920 waste tyre Substances 0.000 claims description 7
- 239000004033 plastic Substances 0.000 claims description 5
- 229920003023 plastic Polymers 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000005245 sintering Methods 0.000 description 34
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 12
- 238000005469 granulation Methods 0.000 description 9
- 230000003179 granulation Effects 0.000 description 9
- 239000000446 fuel Substances 0.000 description 8
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 7
- 239000003830 anthracite Substances 0.000 description 7
- 239000002028 Biomass Substances 0.000 description 6
- 239000000292 calcium oxide Substances 0.000 description 6
- 235000012255 calcium oxide Nutrition 0.000 description 6
- 239000002956 ash Substances 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 239000003575 carbonaceous material Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- WNQQFQRHFNVNSP-UHFFFAOYSA-N [Ca].[Fe] Chemical compound [Ca].[Fe] WNQQFQRHFNVNSP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- 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
- C10L5/48—Solid fuels essentially based on materials of non-mineral origin on industrial residues and waste materials
-
- 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
- C10L5/406—Solid fuels essentially based on materials of non-mineral origin on plastic
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/248—Binding; Briquetting ; Granulating of metal scrap or alloys
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Geochemistry & Mineralogy (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to a preparation method of a sintered solid fuel, which comprises the following steps of (1) preparing materials: according to the mass percentage: 5-10% of converter slag, 61-80% of secondary carbon-containing resources, 11-25% of metal-containing iron powder, 2-5% of rare earth tailings and 2-5% of tar residue; (2) crushing: respectively crushing the converter slag and the secondary carbon-containing resource, wherein the granularity is less than or equal to 3mm, and the weight percentage is more than 95%; (3) mixing; (4) cold press molding: cold-pressing the mixed material on a double-roller press to prepare a composite block with the diameter of 15-50 mm; (5) and (3) high-temperature roasting: placing the composite lumps into a heating furnace for high-temperature roasting at the roasting temperature of less than 300 ℃ for 30-60min, wherein the roasting temperature is more than or equal to 300 ℃ and less than 500 ℃, the roasting temperature is more than or equal to 500 ℃ and less than 1000 ℃, the roasting time is 60-120min, the roasting temperature is more than or equal to 1000 ℃ and less than 1200 ℃, and the roasting time is 20-40 min; (6) and (5) crushing and screening. The invention reduces the generation amount of NOx in the sinter bed and simultaneously fully utilizes secondary carbon-containing resources.
Description
Technical Field
The invention relates to the field of sintering, in particular to a preparation method of a sintered solid fuel.
Background
The current sintering process uses fuels mainly anthracite and coke powder produced by a coking process. The use of anthracite or coke powder has the advantages of high sinter yield, low energy consumption and the like for sintering production, but the content of N element in the coke powder or anthracite is higher, and the proportion is too high, so that the emission of NOx in sintering flue gas exceeds the standard. Along with the increasingly strict requirement on ultralow emission of sintering flue gas, the environmental protection pressure is increasingly high, and meanwhile, high-quality low-N anthracite resources are increasingly scarce. The method also brings a problem that whether the substances for replacing anthracite or coke powder can be found, not only the effect of the heating agent in a sintering system can be realized, but also the pollutant emission can be reduced, and the production cost of iron making can be reduced.
In addition to the conventional anthracite and coke powder, there is also a sintering fuel prepared by the following method, Chinese patent 'a method for using a composite carbon block for sintering' (application No.: CN202010643896.0), which is a method for using a secondary carbonaceous material and a binder as raw materials, grinding the secondary carbonaceous material, mixing with the binder, and heating and roasting in a heating furnace to obtain the composite carbon block for sintering. Replaces the function of the traditional fuel in the sintering process of the heating agent. The method only utilizes secondary carbon resources to replace or partially replace the traditional sintered solid fuel, does not consider the problem of pollutant emission, and does not achieve the effect of reducing NOx emission.
Chinese patents 'a biomass fuel for iron ore sintering and a preparation method and application thereof' (application number: CN201711370241.5), 'a preparation method of a biomass fuel for iron ore sintering' (application number: CN201710900016.1), 'a biomass coke composite fuel for iron ore sintering' (application number: CN201510334980.3) and the like. The above patents all use carbonized biomass or improve the biomass, and partially replace the traditional sintered solid fuel to reduce the cost, but most of the carbonized biomass has carbon content far exceeding the content in anthracite or coke powder, and does not achieve the effect of reducing NOx emission. The combustion characteristics of the carbon material and the fossil fuel are greatly different, and the two fuels have the characteristics of sequential independent combustion, so that the combustion duration is long, the combustion bandwidth is wide, the matching of the combustion front edge and the heat transfer front edge of a material bed is seriously damaged, the temperature of a sintering material bed is low, the liquid phase quantity playing a role in bonding is not enough, and the quality index of a sintered mineral product is deteriorated.
Disclosure of Invention
The invention aims to solve the technical problem of providing a preparation method of a sintering solid fuel, which solves the problem that the prior solid fuel used for sintering causes the emission of NOx in sintering flue gas to exceed standard,
in order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of a sintered solid fuel comprises the following steps:
(1) preparing materials: according to the mass percentage: 5-10% of converter slag, 61-80% of secondary carbon-containing resources, 11-25% of metal-containing iron powder, 2-5% of rare earth tailings and 2-5% of tar residue;
(2) crushing: respectively crushing the converter slag and the secondary carbon-containing resource, wherein the granularity is less than or equal to 3mm, and the weight percentage is more than 95%;
(3) mixing: sequentially loading secondary carbon-containing resources and tar residues into a mixer for 3-5 min; then loading the rare earth tailings into a mixer, and mixing for 2-3 min; then, loading the converter slag into a mixture machine, wherein the mixing time is 5-8 min; finally, filling the metal iron-containing powder into a mixture machine, wherein the mixing time is 4-7 min;
(4) cold press molding: cold-pressing the mixed material on a double-roller press to obtain a composite briquette with the diameter of 15-50 mm;
(5) and (3) high-temperature roasting: placing the composite lumps into a heating furnace for high-temperature roasting at the roasting temperature of less than 300 ℃ for 30-60min, wherein the roasting temperature is more than or equal to 300 ℃ and less than 500 ℃, the roasting temperature is more than or equal to 500 ℃ and less than 1000 ℃, the roasting time is 60-120min, the roasting temperature is more than or equal to 1000 ℃ and less than 1200 ℃, and the roasting time is 20-40 min;
(6) crushing and screening: and crushing and screening the roasted composite lumps to obtain particles with the particle size range of 1-3mm, wherein the particles are used as the sintered solid fuel.
The secondary carbon-containing resource is one or more of various fly ashes in coking, fly ashes in a blast furnace ore coke groove, semi coke, waste tires and waste plastics;
the metal-containing iron powder is machined steel scraps or waste pure iron powder, and the granularity of less than or equal to 3mm accounts for more than 90 percent;
the granularity of the rare earth tailings is less than or equal to 3mm and accounts for more than 90 percent.
A method for using sintered solid fuel comprises premixing sintered solid fuel and quicklime for 2-4min, and mixing the mixture with sintered return ores with particle size of 0.5mm or less for 3-5 min; finally, mixing the iron ore powder with the mixture for three times for granulation, wherein the mixing time is 4-6 min; the obtained sintering raw material is ignited, sintered, crushed and screened after being distributed by a sintering machine.
Compared with the prior art, the invention has the beneficial effects that:
the invention reduces the generation amount of NOx in the sinter bed, simultaneously fully utilizes secondary carbon-containing resources, such as various coking fly ashes, blast furnace ore coke groove fly ashes, semi coke, waste tires, waste plastics and the like, and also utilizes the advantages of low price and easy obtainment of waste converter slag from steel making, waste machining steel cuttings from machining, waste pure iron powder and the like, so as to prepare the novel sintering solid fuel for the sintering process with low generation amount of NOx, realize the function of replacing the traditional fuel in the sintering process as a heating agent, greatly save precious coal resources and reduce the emission of flue gas NOx in the sintering process.
Detailed Description
The invention is further illustrated by the following examples:
the following examples describe the invention in detail. These examples are merely illustrative of the best embodiments of the present invention and do not limit the scope of the invention.
Example 1
Preparation of a sintered solid fuel:
proportioning: according to the mass percentage, the converter slag is 5%, the secondary carbon-containing resource is 70%, the metal-containing iron powder is 20%, the rare earth tailings are 3%, and the tar residue is 2%. The secondary carbon-containing resource is various dust-removing ash for coking, dust-removing ash for blast furnace ore coke groove, semi-coke and waste tyre.
Crushing: the converter slag and the secondary carbon-containing resource are respectively crushed into the grain size of less than or equal to 3mm and the weight percentage of more than 95 percent.
Mixing: sequentially loading the secondary carbon-containing resources and the tar residues into a mixer according to the mass percentage for 3 min; then filling the rare earth tailings into a mixer according to the mass percent, and mixing for 2 min; then, loading the converter slag into a mixture machine according to the mass percentage, wherein the mixing time is 5 min; and finally, filling the metal-containing iron powder into a mixing machine according to the mass percent, wherein the mixing time is 4 min.
Fourthly, cold press molding: and (3) carrying out cold press molding on the mixed material on a double-roller press to obtain a composite briquette with the diameter of 15-50 mm.
High-temperature roasting: and (3) placing the composite lumps into a heating furnace for high-temperature roasting, wherein the roasting temperature is lower than 300 ℃, the roasting time is 30min, the roasting temperature is more than or equal to 300 ℃ and less than 500 ℃, the roasting time is 60min, the roasting temperature is more than or equal to 500 ℃ and less than 1000 ℃, the roasting time is 60min, the roasting temperature is more than or equal to 1000 ℃ and less than 1200 ℃, and the roasting time is 20 min.
Crushing and screening: and crushing and screening the roasted composite lumps to obtain particles with the particle size range of 1-3mm, wherein the particles are used as the sintered solid fuel.
Use of sintered solid fuel:
premixing the sintered solid fuel and quicklime for 2 min; then mixing the mixture with sintered return ores with the granularity of less than 0.5mm for 3 min; finally, mixing the iron ore powder and the mixture for three times for granulation, wherein the mixing time is 4min each time; the obtained sintering raw material is ignited, sintered, crushed and screened after being distributed by a sintering machine.
Example 2
Preparation of a sintered solid fuel:
proportioning: the weight percentage of the converter slag is 10%, the secondary carbon-containing resource is 61%, the metal-containing iron powder is 22%, the rare earth tailings is 4%, and the tar residue is 3%. The secondary carbon-containing resources are various kinds of dust removed in coking, dust removed in blast furnace ore coke groove, semi coke and waste plastics.
Crushing: the converter slag and the secondary carbon-containing resource are respectively crushed, and the weight percentage of the granularity of less than or equal to 3mm is more than 95 percent.
Mixing: sequentially loading secondary carbon-containing resources and tar residues into a mixer according to the mass percentage, wherein the mixing time is 4 min; then filling the rare earth tailings into a mixer according to the mass percent, and mixing for 3 min; then loading the converter slag into a mixing machine according to the mass percentage, wherein the mixing time is 6 min; and finally, filling the metal-containing iron powder into a mixing machine according to the mass percent, wherein the mixing time is 6 min.
Fourthly, cold press molding: and (3) carrying out cold press molding on the mixed material on a double-roller press to obtain a composite briquette with the diameter of 15-50 mm.
High-temperature roasting: and (3) placing the composite lumps into a heating furnace for high-temperature roasting, wherein the roasting temperature is lower than 300 ℃, the roasting time is 60min, the roasting temperature is more than or equal to 300 ℃ and less than 500 ℃, the roasting time is 120min, the roasting temperature is more than or equal to 500 ℃ and less than 1000 ℃, the roasting time is 180min, the roasting temperature is more than or equal to 1000 ℃ and less than 1200 ℃, and the roasting time is 40 min.
Crushing and screening: and crushing and screening the roasted composite lumps to obtain particles with the particle size range of 1-3mm, wherein the particles are used as the sintered solid fuel.
Use of sintered solid fuel:
premixing the sintered solid fuel and quicklime for 4 min; then mixing the mixture with sintered return ores with the granularity less than or equal to 0.5mm for 5 min; finally, mixing the iron ore powder with the mixture for three times for granulation, wherein the mixing time is 6 min; the obtained sintering raw material is ignited, sintered, crushed and screened after being distributed by a sintering machine.
Example 3
Preparation of a sintered solid fuel:
proportioning: according to the mass percentage, the converter slag is 8%, the secondary carbon-containing resource is 68%, the metal-containing iron powder is 20%, the rare earth tailings are 2%, and the tar residue is 2%. The secondary carbon-containing resource is various dust-removing ash for coking, dust-removing ash for blast furnace ore coke groove, semi-coke and waste tyre.
Crushing: the converter slag and the secondary carbon-containing resource are crushed, and the weight percentage of the granularity of less than or equal to 3mm is more than 95 percent.
Mixing: sequentially loading secondary carbon-containing resources and tar residues into a mixer according to the mass percentage, wherein the mixing time is 5 min; then loading the rare earth tailings into a mixer according to the mass percentage, and mixing for 3 min; then, loading the converter slag into a mixture machine according to the mass percentage, wherein the mixing time is 8 min; and finally, filling the metal-containing iron powder into a mixing machine according to the mass percentage, wherein the mixing time is 7 min.
Fourthly, cold press molding: and (3) carrying out cold press molding on the mixed material on a double-roller press to obtain a composite briquette with the diameter of 15-50 mm.
High-temperature roasting: and (3) placing the composite lumps into a heating furnace for high-temperature roasting, wherein the roasting temperature range is less than 300 ℃, the roasting time is 40min, the roasting temperature is more than or equal to 300 ℃ and less than 500 ℃, the roasting time is 80min, the roasting temperature is more than or equal to 500 ℃ and less than 1000 ℃, the roasting time is 150min, the roasting temperature is more than or equal to 1000 ℃ and less than 1200 ℃, and the roasting time is 30 min.
Crushing and screening: and crushing and screening the roasted composite lumps to obtain particles with the particle size range of 1-3mm, wherein the particles are used as the sintered solid fuel.
Use of sintered solid fuel:
premixing the sintered solid fuel and quicklime for 2 min; mixing the mixture after granulation with sintered return ores with the granularity less than or equal to 0.5mm for 3 min; finally, mixing the iron ore powder with the mixture for three times for granulation, wherein the mixing time is 5min each time; the obtained sintering raw material is ignited, sintered, crushed and screened after being distributed by a sintering machine.
Example 4
Preparation of a sintered solid fuel:
proportioning: according to the mass percentage, the converter slag is 8%, the secondary carbon-containing resource is 71%, the metal-containing iron powder is 11%, the rare earth tailings are 5%, and the tar residue is 5%. The secondary carbon-containing resources are various kinds of dust removed in coking, dust removed in blast furnace ore coke groove, semi coke and waste tires.
Crushing: the converter slag and the secondary carbon-containing resource are crushed, and the weight percentage of the granularity of less than or equal to 3mm is more than 95 percent.
Mixing: sequentially loading secondary carbon-containing resources and tar residues into a mixer according to the mass percentage, wherein the mixing time is 4 min; then filling the rare earth tailings into a mixer according to the mass percent, and mixing for 3 min; then, loading the converter slag into a mixture machine according to the mass percentage, wherein the mixing time is 6 min; and finally, filling the metal-containing iron powder into a mixing machine according to the mass percentage, wherein the mixing time is 5 min.
Fourthly, cold press molding: and (3) carrying out cold press molding on the mixed material on a double-roller press to obtain a composite briquette with the diameter of 15-50 mm.
High-temperature roasting: and (3) placing the composite lumps into a heating furnace for high-temperature roasting, wherein the roasting temperature is lower than 300 ℃, the roasting time is 50min, the roasting temperature is more than or equal to 300 ℃ and less than 500 ℃, the roasting time is 90min, the roasting temperature is more than or equal to 500 ℃ and less than 1000 ℃, the roasting time is 120min, the roasting temperature is more than or equal to 1000 ℃ and less than 1200 ℃, and the roasting time is 35 min.
Crushing and screening: and crushing and screening the roasted composite lumps to obtain particles with the particle size range of 1-3mm, wherein the particles are used as the sintered solid fuel.
Use of sintered solid fuel:
premixing the sintered solid fuel and quicklime for 2 min; mixing the mixture after granulation with sintered return ores with the granularity less than or equal to 0.5mm for 4 min; finally, mixing the iron ore powder with the mixture for three times for granulation, wherein the mixing time is 5 min; the obtained mixture is subjected to ignition, sintering, crushing and screening after distribution.
Example 5
Preparation of a sintered solid fuel:
proportioning: the converter slag comprises 6% of converter slag, 71% of secondary carbon-containing resources, 13% of metal-containing iron powder, 5% of rare earth tailings and 5% of tar residue in percentage by mass. The secondary carbon-containing resources are various coking fly ashes, blast furnace ore coke groove fly ashes, semi coke, waste tires and waste plastics.
Crushing: the converter slag and the secondary carbon-containing resource are crushed, and the weight percentage of the granularity of less than or equal to 3mm is more than 95 percent.
Mixing: sequentially loading secondary carbon-containing resources and tar residues into a mixer according to the mass percentage, wherein the mixing time is 5 min; then filling the rare earth tailings into a mixer according to the mass percent, and mixing for 3 min; then, loading the converter slag into a mixture machine according to the mass percentage, wherein the mixing time is 7 min; and finally, filling the metal-containing iron powder into a mixing machine according to the mass percentage, wherein the mixing time is 5 min.
Fourthly, cold press molding: and (3) carrying out cold press molding on the mixed material on a double-roller press to obtain a composite briquette with the diameter of 15-50 mm.
High-temperature roasting: and (3) placing the composite lumps into a heating furnace for high-temperature roasting, wherein the roasting temperature is lower than 300 ℃, the roasting time is 55min, the roasting temperature is more than or equal to 300 ℃ and less than 500 ℃, the roasting time is 85min, the roasting temperature is more than or equal to 500 ℃ and less than 1000 ℃, the roasting time is 100min, the roasting temperature is more than or equal to 1000 ℃ and less than 1200 ℃, and the roasting time is 25 min.
Crushing and screening: and crushing and screening the roasted composite lumps to obtain particles with the particle size range of 1-3mm, wherein the particles are used as the sintered solid fuel.
Use of sintered solid fuel:
premixing the sintered solid fuel and quicklime for 2 min; mixing the mixture after granulation with sintered return ores with the granularity of less than or equal to 0.5mm for 3 min; finally, mixing the iron ore powder with the mixture for three times for granulation, wherein the mixing time is 4min each time; the obtained sintering material is ignited, sintered, crushed and screened after being distributed by a sintering machine.
The physical and chemical indexes of the sintered solid fuel are shown in Table 1.
TABLE 1 physical and chemical indexes of sintered solid fuel wt%
| Name (R) | Fixed carbon | Metallic iron | Calcium ferrite | Volatile component | Other ash content | Moisture content |
| Example 1 | 68.12 | 16.38 | 3.58 | 2.42 | 10.37 | 0.23 |
| Example 2 | 63.44 | 17.56 | 5.67 | 1.98 | 11.01 | 0.34 |
| Example 3 | 66.67 | 16.68 | 5.28 | 1.77 | 9.35 | 0.25 |
| Example 4 | 69.12 | 8.98 | 5.08 | 1.86 | 14.61 | 0.35 |
| Example 5 | 68.78 | 10.44 | 4.36 | 1.99 | 14.10 | 0.33 |
| Coke powder | 83.68 | 0.76 | 0.46 | 1.98 | 13.41 | 0.35 |
The effects of the examples after sintering are shown in Table 2.
Table 2: sintering index and NOx concentration
Claims (4)
1. A preparation method of a sintered solid fuel is characterized by comprising the following steps:
(1) preparing materials: according to the mass percentage: 5-10% of converter slag, 61-80% of secondary carbon-containing resources, 11-25% of metal-containing iron powder, 2-5% of rare earth tailings and 2-5% of tar residue;
(2) crushing: respectively crushing the converter slag and the secondary carbon-containing resource, wherein the granularity is less than or equal to 3mm, and the weight percentage is more than 95%;
(3) mixing: sequentially loading secondary carbon-containing resources and tar residues into a mixer for 3-5 min; then loading the rare earth tailings into a mixer, and mixing for 2-3 min; then, loading the converter slag into a mixture machine, wherein the mixing time is 5-8 min; finally, filling the metal iron-containing powder into a mixture machine, wherein the mixing time is 4-7 min;
(4) cold press molding: cold-pressing the mixed material on a double-roller press to obtain a composite briquette with the diameter of 15-50 mm;
(5) and (3) high-temperature roasting: placing the composite lumps into a heating furnace for high-temperature roasting at the roasting temperature of less than 300 ℃ for 30-60min, wherein the roasting temperature is more than or equal to 300 ℃ and less than 500 ℃, the roasting temperature is more than or equal to 500 ℃ and less than 1000 ℃, the roasting time is 60-120min, the roasting temperature is more than or equal to 1000 ℃ and less than 1200 ℃, and the roasting time is 20-40 min;
(6) crushing and screening: and crushing and screening the roasted composite lumps to obtain particles with the particle size range of 1-3mm, wherein the particles are used as the sintered solid fuel.
2. The method for preparing the sintered solid fuel according to claim 1, wherein the secondary carbon-containing resource is one or more of various fly ashes in coking, fly ashes in blast furnace coke oven, semi coke, waste tires and waste plastics.
3. The method for preparing sintered solid fuel according to claim 1, wherein said metallic iron-containing powder is machined steel scrap or waste pure iron powder having a particle size of 3mm or less and is 90% or more.
4. The method for preparing the sintered solid fuel according to claim 1, wherein the rare earth tailings have a particle size of 3mm or less and account for 90% or more.
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