A method for preparing iron-making fuel using carbon-containing waste

Abstract

The present invention relates to a method for preparing sintering fuel from carbon-containing wastes, comprising the following steps: 1) the water content of coking wastewater sludge does not exceed 5%, the water content of tar residue does not exceed 10%, the tar residue is heated to be completely liquefied, and the coke powder is ground to less than 200 meshes; 2) the coke powder is mixed with coking wastewater sludge, the tar residue is sprayed, and then the coke coal, coke powder, coking wastewater sludge, and tar residue are kneaded into a paste, and granular waste resin is added, and the material is extruded into flat agglomerates with a particle size of 10 mm to 20 mm; 3) the agglomerates are dried until the water content does not exceed 2%; 4) the agglomerates are calcined and carbonized in an anaerobic environment, the porosity of the carbonized agglomerates is ≥50%, and the bulk density is 1.0 to 2.5 g / cm 3 , and the compressive strength is ≥10 MPa; 5) the carbonized agglomerates replace part of the iron ore sintering fuel to participate in sintering production, or replace the pulverized coal for blast furnace injection as the injection fuel. The present invention realizes the high-value utilization of carbon-containing wastes in the coking process, reduces the discharge of solid wastes that cannot be treated at the same time, and reduces the CO2 emissions caused by the direct incineration of carbon-containing wastes.

Description

Technical Field

[0001] The present invention belongs to the technical field of coking coal blending, and relates to a method for preparing iron-making fuel by using carbon-containing waste. Background Art

[0002] A large amount of carbon-containing solid waste is generated during the coking production process. Many of these carbon-containing solid wastes cannot be directly utilized. In order to reduce the discharge of pollutants, the carbon-containing waste is generally incinerated in a coke oven or a blast furnace. This not only wastes the utilization of carbon in the solid waste, but also produces a large amount of CO2 during combustion. The carbon-containing solid waste in the coking production process includes fine coke powder, dedusting ash, waste tar residue, wastewater sludge, waste resin, etc. The carbon content, bonding properties, and mineral composition of these solid wastes vary greatly, and it is very difficult to recycle any one of the above solid wastes alone. If these carbon-containing solid wastes are directly used in coking coal blending for coke making, it will also deteriorate the coke quality to a certain extent, increase the ash content in the coke, and the use of these high-ash cokes in blast furnace iron making will increase the coke ratio of the blast furnace, which is not conducive to the efficient and low-cost operation of the blast furnace.

[0003] Iron ore sintering generally requires coke breeze with a particle size of 5-10 mm as fuel to provide the energy required for the high-temperature liquid phase transformation of iron ore. However, due to the small particle size of the coke powder and dedusting ash generated during the coking production process, the air permeability is poor and dust is easily generated during negative pressure suction, so the coke powder or dedusting ash with a particle size less than 1 mm cannot be directly applied to sintering production. In order to realize the high-value utilization of these carbon-containing wastes, reduce pollutants and CO2 emissions, a method for comprehensively utilizing these carbon-containing wastes with high added value is needed, so as to improve the economic performance of the utilization of carbon-containing wastes while ensuring the requirements of sintering production.

[0004] 1. Application of Coke Oven Desulfurization and Dedusting Ash, Sintered Ore Fuel (202210879335.X), this invention discloses an application of coke oven desulfurization and dedusting ash, sintered ore fuel. In this sintered ore fuel, the coke oven desulfurization and dedusting ash contains sodium elements and carbon-containing organic matter, which makes the coke oven desulfurization and dedusting ash have strong adsorption ability, can adsorb iron-containing organic matter, and thus provides favorable conditions for the oxidation reaction during sintering, improving the finished product rate of sintered ore. In addition, the carbon content of the mixture of coke discharging dedusting ash and dry quenching coke dedusting ash is greater than 85%, the calorific value is greater than 27000 kJ / kg, and it has the characteristics of coke fines. Therefore, the coke discharging dedusting ash and dry quenching coke dedusting ash can be used as sintering fuel.

[0005] 2. Method and Usage of Making Sintering Fuel with Coking Environmental Dust Removal Ash (CN201910926797.0), this invention discloses a method and usage of making sintering fuel with coking environmental dust removal ash. The making method includes: mixing coking environmental dust removal ash with tail ash of sintering machine to obtain a mixture; performing pelletizing treatment on the mixture and adding an organic binder solution during the pelletizing treatment to obtain dust removal ash pellets; wherein, the dust removal ash pellets are used as sintering fuel. By making the coking environmental dust removal ash into dust removal ash pellets and then using them as sintering fuel, the heat release during combustion can be easily concentrated and utilized, improving the strength of sintered ore and ensuring relatively high metallurgical properties of sintered ore.

[0006] 3. Biomass Fuel for Iron Ore Sintering, Its Preparation Method and Application (201711370241.5), this invention discloses a biomass fuel for iron ore sintering, its preparation method and application. According to the requirements of iron ore sintering fuel, the biomass is first formed and carbonized, and then the biomass fuel is filled and wrapped with urea solution and CaO powder to solve the defects of biomass such as loose pores, large specific surface area, low fixed carbon content, and too fast reaction. The prepared biomass fuel has performance indicators close to those of coke powder, can replace part of the coke powder for sintering production, and can effectively inhibit the emission of pollutants during the iron ore sintering production process.

[0007] 4. Method of Using Waste Activated Carbon Powder for Sintering, Sintering Mixture and Sintered Ore (CN202010551157.9), this invention provides a method of using waste activated carbon powder for sintering, sintering mixture and sintered ore. The waste activated carbon powder is generated when activated carbon purifies sintering flue gas. The method includes: mixing the waste activated carbon powder with coke powder according to a mass ratio of 12 - 37.8:62.2 - 88 to obtain sintering fuel; the particle size of the waste activated carbon powder ≤ 3mm, and the mass fraction of the particle size < 0.5mm is 70 - 80%; the particle size of the coke powder ≤ 8mm, and the mass fraction of the particle size < 0.5mm is 10 - 15%; mixing the sintering fuel, iron ore powder to be sintered and solvent to obtain a sintering mixture; the mass ratio of the sintering fuel and the iron ore powder to be sintered is 3 - 6:75 - 90; granulating the sintering mixture and then using it for sintering. Using the method of this invention, the firing rate can reach 88.87%, the finished product rate of sintered ore can reach 76.44%, the prepared sintered ore has good metallurgical properties, its drum strength > 81%, the concentration of discharged flue gas SO 2 concentration does not exceed 38mg / m 3 , the NOx concentration does not exceed 94mg / m 3 ; at the same time, the secondary utilization of waste activated carbon powder is realized.

[0008] 5. A sintering fuel and its usage method (CN201510999610.1). This invention discloses a sintering fuel. The components of the sintering fuel include semi-coke, and the weight of the semi-coke accounts for 15 - 35% of the total weight of the sintering fuel. The components of the sintering fuel also include at least one of anthracite and coke fines. The sintering fuel can effectively solve the problems of caking and blockage in the head electrostatic precipitator, and is beneficial to reducing the production cost of sintering, improving the sintering effect, and enhancing the quality of sintered ore.

[0009] 6. A method for effectively determining the proportion of waste activated carbon powder replacing sintering fuel (202111151399.X). This invention relates to a method for effectively determining the proportion of waste activated carbon powder replacing sintering fuel. First, sample and analyze the particle size distribution and fixed carbon content of waste activated carbon powder and the sintering fuel to be replaced respectively. Then, calculate the proportion of waste activated carbon powder replacing sintering fuel according to the fixed carbon content. Next, calculate the proportion of sintering fuel with different particle sizes in the comprehensive fuel after replacement according to the particle size distribution. Finally, mix the waste activated carbon powder with sintering fuel of different particle sizes according to the calculation results of the previous two steps. In the process of using waste activated carbon powder to replace sintering fuels such as anthracite and coke fines, this invention comprehensively considers the influence of fixed carbon content and particle size, determines the optimal replacement ratio, meets the requirements of the blast furnace for fuel, and achieves a high firing rate.

[0010] Although the above-mentioned Patent Document 1 granulates the coking dedusting ash, it is difficult to ensure the strength of the pellets after granulation by simply mixing and binding coke fines with a binder. As a result, when these pellets are laid on the sintering trolley, they are prone to pulverization, reducing the sintering air permeability. In Patent Document 2, the binder solution is sodium humate binder and / or sodium carboxymethylcellulose. Sodium, as an alkali metal, easily accelerates the catalysis of coke deterioration in the blast furnace, causing the enrichment of alkali metals in the blast furnace and forming furnace tumors, thus affecting the stable operation of the blast furnace. Therefore, whether from the perspective of theoretical feasibility or actual production operation, additives containing alkali metal sodium are not feasible. The urea added in Patent Document 3, also known as formamide and commonly known as nitrogen fertilizer, will significantly increase the NOx emissions during the sintering process, which is not conducive to sintering desulfurization and denitrification. Patent Documents 4 - 6 directly mix carbon-containing waste with coke fines, anthracite, etc. to prepare sintering fuel and then use it for sintering. This method is not applicable to carbon-containing waste with too fine particle size or liquid phase. Summary of the Invention

[0011] The purpose of the present invention is to provide a method for preparing iron-making fuel using carbon-containing waste, to prepare granular solid fuel for sintering production from carbon-containing waste, realize the recycling of carbon-containing waste, reduce the discharge of unutilizable waste, and reduce the CO 2 emissions caused by direct incineration of previous carbon-containing waste, and achieve the green and low-carbon comprehensive recycling of various types of carbon-containing waste.

[0012] In order to achieve the above object, the present invention adopts the following technical solutions:

[0013] A method for preparing ironmaking fuel using carbon-containing wastes comprises the following steps:

[0014] 1) Raw material pretreatment: Dry the coking wastewater sludge until the moisture content does not exceed 5%, centrifuge the tar residue to dehydrate it to a moisture content of no more than 10%, then heat the tar residue to completely liquefy, and grind the coke powder to 200 mesh or less;

[0015] 2) Mixing and kneading: Mix the coke powder with the coking wastewater sludge after drying, and evenly spray the liquefied tar residue into the mixture during the mixing process. Then, in the kneading machine, the coke, coke powder, coking wastewater sludge and tar residue are further kneaded into a paste. During the kneading process, granular waste resin is added, and the kneaded materials are squeezed into flat agglomerates with a particle size of 10mm to 20mm using a 1000-2000N press, so that the coke powder, tar residue, carbonaceous sludge and waste resin are further fully mixed and contacted with each other;

[0016] 3) Low-temperature drying: cold-consolidating the formed blocks obtained in step 2) into agglomerates, and drying at low temperature until the water evaporates, and the water content after drying does not exceed 2%;

[0017] 4) Calcination and dry distillation: The dried agglomerate of step 3) is placed in an oxygen-free environment for calcination and dry distillation pretreatment to obtain a dry distillation agglomerate, wherein the porosity of the dry distillation agglomerate is ≥50%, and the material volume density of the dry distillation agglomerate is 0.5-2.5 g / cm 3 , compressive strength ≥10MPa;

[0018] 5) The dry distillation agglomerate is used to replace part of the iron ore sintering fuel to participate in the sintering production to prepare sintered ore, or to replace the blast furnace pulverized coal as injection fuel.

[0019] The coke powder includes dry quenching primary dust removal coke powder, secondary dust removal coke powder and screened coke powder, with a fixed carbon content of ≥78% and a coke powder particle size of ≤1mm; the tar residue has a softening point of ≤200°C and an ash content of ≤1.0%; the coking wastewater sludge has a fixed carbon content of ≥35%; the waste resin has an ash content of ≤2% and a carbon content of ≥10%; the coking coal has a G value of ≥85 and a Y value of ≥15mm.

[0020] The fixed carbon content of the kneading and extruding block obtained in the above step 2) is ≥55%.

[0021] The drying temperature of the cold-consolidated agglomerates in step 3) is controlled at 30-80°C.

[0022] The oxygen-free environment in step 4) is N 2In an air, Ar or vacuum environment, heat it up to 150 - 850 °C at a heating rate of not less than 10 °C / min and calcine for 20 - 60 min.

[0023] The coking wastewater sludge comes from the filtration sludge of coking product recovery wastewater and / or water quenching coke pond wastewater.

[0024] In the above step 5), the proportion of using the dry distillation agglomerates to replace the iron ore sintering fuel is ≥ 40%. The reduction degradation rate RDI +3.15 of the sintered ore prepared from the dry distillation agglomerates is ≥ 70% in mm, and the reducibility RI is ≥ 83%.

[0025] In the above step 5), the proportion of using the dry distillation agglomerates to replace the pulverized coal for blast furnace injection is ≥ 10%, and the calorific value of the dry distillation agglomerates is ≥ 28 MJ / kg.

[0026] The raw material ratio is calculated by weight as follows: 5 - 30 parts of coking coal, 15 - 60 parts of coke powder, 10 - 30 parts of tar residue, 5 - 15 parts of coking wastewater sludge, 10 - 30 parts of waste resin, meeting the requirements of blast furnace production.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] 1. Drying the coking wastewater sludge to reduce moisture can effectively avoid the cracking of the agglomerates caused by water evaporation during the subsequent low-temperature drying and calcination dry distillation processes, thereby ensuring that the new rate of the agglomerates after dry distillation reaches more than 90%. Grinding the coke powder to 200 meshes and below can ensure the uniformity of the subsequent materials, avoid uneven mixing due to different raw material particle sizes, and different fuel property indexes are prepared. Heating the tar residue to complete liquefaction and then spraying it into the mixture can increase the contact area between the coke residue and the coke powder and the wastewater sludge;

[0029] 2. Since there are two kinds of materials, solid and paste-like liquid, in the carbon-containing waste, in order to mix them evenly, first mix the solid-phase materials, and then sandblast the liquid-phase tar residue. The sticky tar residue is evenly distributed inside the mixed materials, and then kneading and pressing are used to form. The coke powder and sludge are fully utilized as the main forming materials, and the liquid-phase tar residue is used as the kneading and fusing agent. The liquid-phase tar residue can fully infiltrate into the inside of the formed material block, which is beneficial to the adhesiveness between the materials and the uniformity of the pores of the agglomerates during the subsequent dry distillation process;

[0030] 3. Uniformly adding waste resin during the kneading process can effectively increase the calorific value of the dry distillation agglomerates by more than 10%, and at the same time realize the reuse of waste resin;

[0031] 4. Since the tar residue contains a large amount of volatile components, a porous dry distillation agglomerate will be obtained after calcination dry distillation pretreatment. The porous structure is beneficial to combustion and improves the air permeability of the sintering material layer;

[0032] 5. Adding a small amount of coking coal will precipitate colloids during the dry distillation process, which will improve the adhesion between the raw materials, and help the extruded agglomerates to remain in block shape after dry distillation, thereby improving the permeability between the fuel and the carbon-containing minerals during the sintering process;

[0033] 6. It is conducive to realizing high added value utilization of carbon-containing waste in the coking process, while reducing the discharge of untreated solid waste and reducing the CO2 emissions caused by direct incineration of carbon-containing waste. 2 emission. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a flow chart of preparing ironmaking fuel from carbon-containing wastes according to the present invention. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the specific implementation methods of the present invention are further described below in conjunction with examples. The following examples are used to specifically illustrate the contents of the present invention. These examples are only general descriptions of the contents of the present invention and do not limit the contents of the present invention.

[0036] Embodiment 1:

[0037] 1) The coking product recovery wastewater sludge is fully aired and the moisture content is controlled at 3%. Coking coal, coke powder, tar residue, coking wastewater sludge and waste resin are mixed and kneaded into a paste according to the weight parts in Table 1, wherein coke powder and coking product recovery wastewater sludge act as the main skeleton under cold consolidation, tar residue acts as a binder, the fixed carbon content of coke powder after dry quenching dust removal is 79%, the fixed carbon content of coke powder after screening transport is 82%, and the particle size of the two coke powders is 0.85mm. The moisture content of tar residue after centrifugal dehydration is 4.0%, the softening point is 180℃, the ash content is 0.8%, the fixed carbon content is 40%, the fixed carbon content of coking wastewater sludge is 35%, and the ash content of waste resin is 2%. The G value of coking coal is 85, and the Y value is 15mm.

[0038] Table 1 Weight ratio of each carbon-containing waste

[0039] Coal type Coke powder from primary dedusting of coke dry quenching Coking coal Screened and transported coke powder Tar residue Sludge Waste resin Ratio 25 5 30 20 5 15

[0040] 2) The blocks were extruded by a 2000N press, and the flat agglomerates had a particle size of 10 mm and a fixed carbon content of 75%.

[0041] 3) The formed blocks are cold-consolidated into agglomerates and dried at 80°C, and the moisture is further evaporated to 2%, and the cracks of the agglomerates are reduced by more than half during the dry distillation and roasting process.

[0042] 4) Place the dried mass from step 3) under N 2Under an inert atmosphere, it is heated to 850 °C at a rate of 10 °C / min for roasting and carbonization pretreatment. After roasting for 20 min, a carbonized lump is obtained. The porosity of the carbonized lump reaches 60%, and the bulk density of the carbonized lump is 1.5 g / cm 3 , the compressive strength is 10 MPa. As the temperature rises, the tar residue and waste resin turn into a liquid phase at high temperature and begin to melt the entire lump. The anaerobic pyrolysis at 850 °C can thermally decompose the organic matter in the sludge into gas phase, semicoke and liquid bio-oil. During this process, gas is released, and finally a porous carbon-containing carbonized lump is formed.

[0043] 5) Replace 50% of the sintering fuel coke with the carbonized lump. Use the carbonized lump as the iron ore sintering fuel to participate in the sintering production. The reduction degradation index RDI +3.15 mm of the produced sinter is 70%, and the reducibility RI is 83%, meeting the requirements of blast furnace production.

[0044] Example 2:

[0045] 1) Dry the quenched coke quenching pond wastewater sludge and coking product recovery wastewater sludge thoroughly in the sun, and control the moisture content of both to 4.5%. Mix and knead the coke, coke powder, tar residue, quenched coke quenching pond wastewater sludge, coking product recovery wastewater sludge, and waste resin according to the weight parts ratio in Table 2 until it becomes a paste. Among them, the coke powder and coking wastewater sludge act as the main skeleton under cold consolidation, and the tar residue acts as the binder. The fixed carbon content of the dry quenched coke secondary dedusting coke powder is 78%, the fixed carbon content of the screening and transporting coke powder is 80%, the particle size of the two kinds of coke powder is 1 mm, the moisture content of the tar residue after centrifugal dehydration is 5.0%, the softening point of the tar residue is 200 °C, the ash content is 1.0%, the fixed carbon content is 60%, the fixed carbon content of the coking wastewater sludge is 65%, the ash content of the waste resin is 1.5%, the G value of the coke is 85, and the Y value is 20 mm.

[0046] Table 2 Weight parts ratio of each carbon-containing waste

[0047] Coal type Coke powder from secondary dedusting of coke dry quenching Screened and transported coke powder Coking coal Tar residue Sludge Waste resin Ratio 10 10 10 30 10 30

[0048] 2) Use a 1500 N press to extrude into a molded block, a flat lump with a particle size of 20 mm, and the fixed carbon content of the lump is 55%.

[0049] 3) Cold-consolidate the molded block into a lump, dry it at 30 °C, and further reduce the moisture content to less than 1.5%. During the carbonization roasting process of the lump, the cracks of the lump are reduced by 2 / 3.

[0050] 4) Place the dried lump obtained in step 3) under an Ar atmosphere and heat it to 150 °C at a rate of 15 °C / min for roasting and carbonization pretreatment. After roasting for 60 min, a carbonized lump is obtained. The porosity of the carbonized lump reaches 65%, and the bulk density of the carbonized lump is 1.0 g / cm 3, with a compressive strength of 15 MPa. As the temperature rises to 150 °C, the tar residue and waste resin turn into a liquid phase at high temperature, starting to melt the whole mass. During this process, gases are released, and finally a porous carbonaceous dry distillation mass is formed.

[0051] 5) Using the dry distillation mass to replace 40% of the sintering fuel coke breeze. The dry distillation mass is used as an iron ore sintering fuel to participate in sintering production. The reduction degradation index RDI +3.15 of the produced sinter is 75% in terms of mm, and the reducibility RI is 88%, meeting the requirements of blast furnace production.

[0052] Example 3:

[0053] 1) Sun-dry the wastewater sludge in the quenching pit of the water-quenched coke thoroughly, and control the moisture content at 5%. Mix and knead the coke breeze, coke powder, tar residue, wastewater sludge in the quenching pit of the water-quenched coke, and waste resin according to the weight parts ratio in Table 3 to form a paste. Among them, the coke powder and coking wastewater sludge act as the main framework under cold consolidation, and the tar residue acts as a binder. The fixed carbon content of the screened coke breeze is 78%, the fixed carbon content of the screened coke powder is 80%, the particle size of the two kinds of coke powder is 1 mm, the moisture content of the tar residue after centrifugal dehydration is 5.0%, the softening point is 200 °C, the ash content is 1.0%, the fixed carbon content is 65%, the fixed carbon content of the coking wastewater sludge is 65%, the ash content of the waste resin is 1.5%, the G value of the coke coal is 90, and the Y value is 15 mm.

[0054] Table 3 Weight parts ratio of each carbon-containing waste

[0055]

[0056] 2) Use a 1000 N press to extrude into a molded block, a flat mass with a particle size of 20 mm, and the fixed carbon content of the mass is 85%.

[0057] 3) Cold-consolidate the molded block into a mass, dry it at 50 °C, and further reduce the moisture content to less than 1.0%. During the dry distillation roasting process of the mass, the cracks of the mass are reduced by 4 / 5.

[0058] 4) Place the dried mass obtained in step 3) under vacuum and heat it to 350 °C at a rate of 10 °C / min for roasting and dry distillation pretreatment. Roast for 60 min to obtain a dry distillation mass. The porosity of the dry distillation mass reaches 50%, and the bulk density of the material of the dry distillation mass is 2.5 g / cm 3 , with a compressive strength of 30 MPa. As the temperature rises to 350 °C, the tar residue and waste resin turn into a liquid phase at high temperature, starting to melt the whole mass. During this process, gases are released, and finally a porous carbonaceous dry distillation mass is formed.

[0059] 5) Use the dry distillation mass to replace 10% of the pulverized coal injected into the blast furnace as the blast furnace injection fuel. The calorific value of the dry distillation mass is 28 MJ / kg, meeting the requirements of blast furnace production.

Claims

1. A method for preparing iron-making fuel using carbon-containing waste, characterized in that, it includes the following steps: 1) Raw material pretreatment: The moisture content of coking wastewater sludge does not exceed 5%, and the moisture content of tar residue does not exceed 10%. Then heat the tar residue until it is completely liquefied, and grind the coke powder to less than 200 mesh; 2) Mixing and kneading: Mix the coke powder with coking wastewater sludge. During the mixing process, spray the liquefied tar residue into the mixture. Then continue to knead the coking coal, coke powder, coking wastewater sludge, and tar residue in a kneader until it becomes a paste. Add granular waste resin during the kneading process, and use a press to extrude the kneaded material into flat agglomerates with a particle size of 10 mm to 20 mm; The raw material ratio is calculated by weight: 5 to 30 parts of coking coal, 15 to 60 parts of coke powder, 10 to 30 parts of tar residue, 5 to 15 parts of coking wastewater sludge, and 10 to 30 parts of waste resin; 3) Low-temperature drying: Cool and solidify the formed blocks obtained in step 2) into agglomerates, and dry to volatilize the moisture. After drying, the moisture content does not exceed 2%; 4) Roasting and carbonization: Place the dried agglomerates from step 3) in an N 2 environment or an Ar environment or in a vacuum state, and heat it at a heating rate of not less than 10 °C / min to 150 - 350 °C, roast for 20 - 60 min to obtain carbonized agglomerates. The porosity of the carbonized agglomerates is ≥50%, the bulk density of the carbonized agglomerates is 0.5 - 2.5 g / cm 3 , the compressive strength is ≥10 MPa, and the forming rate of the agglomerates after carbonization reaches more than 90%; 5) Substitute the dry-distilled agglomerates for part of the iron ore sintering fuel to participate in sintering production to prepare sintered ore, or substitute the blast furnace injection coal as the injection fuel.

2. The method for preparing iron-making fuel using carbon-containing waste according to claim 1, characterized in that; The coke powder includes dry quenching coke primary dedusting coke powder, secondary dedusting coke powder, and screening and transporting coke powder, with a fixed carbon content ≥ 78% and a coke powder particle size ≤ 1 mm; The softening point of the tar residue ≤ 200 °C and the ash content ≤ 1.0%; The fixed carbon content of the coking wastewater sludge ≥ 35%; The ash content of the waste resin ≤ 2% and the carbon content ≥ 10%; The G value of the coking coal ≥ 85 and the Y value ≥ 15 mm.

3. The method for preparing iron-making fuel using carbon-containing waste according to claim 1, characterized in that; The fixed carbon content of the kneaded and extruded formed blocks obtained in step 2) ≥ 55%.

4. The method for preparing iron-making fuel using carbon-containing waste according to claim 1, characterized in that; The drying temperature of the cold-consolidated agglomerates in step 3) is controlled at 30 to 80 °C.

5. The method for preparing iron-making fuel using carbon-containing waste according to claim 1, characterized in that; The coking wastewater sludge comes from coking product recovery wastewater and / or water quenching coke pond wastewater filtration sludge.

6. The method for preparing iron-making fuel using carbon-containing waste according to claim 1, characterized in that; In the above step 5), the proportion of using the retorted lumps to replace the iron ore sintering fuel is ≥ 40%, and the reduction degradation index (RDI) of the sinter prepared by using the retorted lumps +3.15 mm ≥ 70%, and the reducibility index (RI) ≥ 83%.

7. The method for preparing iron-making fuel using carbon-containing waste according to claim 1, characterized in that; The proportion of substituting the dry-distilled agglomerates for blast furnace injection coal in step 5) ≥ 10%, and the calorific value of the dry-distilled agglomerates ≥ 28 MJ / kg.

Images