Sintering method using solid waste activated carbon powder

Abstract

The invention discloses a sintering method using solid waste activated carbon powder. The sintering method comprises the following steps: preparing a mixture A and a mixture B; spraying quicklime digestion liquid to the surface of the solid waste activated carbon powder, and granulating to form an activated carbon powder inner core; taking the activated carbon powder inner core as a pelletizing core, pelletizing by utilizing the mixture A to form a pellet inner core A, and pelletizing by utilizing the mixture B to form an activated carbon powder pretreated pellet; preparing an upper-layer sintering mixture and a lower-layer sintering mixture; the lower-layer sintering mixture is added to a sintering trolley to be sintered; and when the sintering pallet runs to 1 / 5-1 / 3 of the total length of the sintering machine, the upper sintering mixture is distributed and added to the surface of the formed sinter layer for sintering. The problems that the combustion characteristics of the solid waste activated carbon powder and the coke powder are not matched and the solid waste activated carbon powder is high in sulfur and nitrogen impurity content to affect the sinter quality are solved, the problems that due to sintering of a thick bed, the permeability of the bed is reduced, the bottom sinter is over-melted and the sinter quality is uneven are solved, and the metallurgical performance index of the sinter is improved.

Description

Technical Field

[0001] The present invention relates to the technical fields of materials and metallurgy, and more specifically, to a sintering method using waste activated carbon powder. Background Art

[0002] Sintering is a process of sintering various powdered iron-containing raw materials into blocks by mixing appropriate amounts of fuel and flux, followed by mixing and granulation, and then subjecting the materials to a series of physical and chemical changes on a sintering device. Sintering is a typical high-energy-consuming and highly polluting industry, generally accounting for 10%-15% of the total energy consumption of iron and steel enterprises. The sintering process emits waste gas containing a large amount of greenhouse gas CO 2 and polluting gas SO x , NO x , which is the main air pollution source in the iron and steel industry.

[0003] To meet the new environmental protection requirements, the activated carbon desulfurization and denitrification technology for sintering flue gas has been promoted and applied in iron and steel enterprises. The activated carbon desulfurization and denitrification process is a sintering flue gas purification technology that can simultaneously treat multiple pollutants. The removal rates of SO 2 and NO x are as high as 98% and 80% respectively. The activated carbon desulfurization and denitrification system mainly consists of three parts: adsorption, desorption, and sulfur recovery and utilization. It has the advantages of simple process, small floor area, and can realize the resource utilization of SO 2 in flue gas. Considering aspects such as compressive strength, wear resistance, porosity, and desulfurization and denitrification ability, most of the activated carbon for desulfurization and denitrification used in industry at present is cylindrical activated carbon made of coal as the material and activated by high-temperature heating.

[0004] During the process of adding activated carbon in the activated carbon flue gas purification device from the top of the tower to the adsorption tower, it moves downward under the dual action of gravity and the bottom discharging device of the tower. During the movement, small particles of waste activated carbon powder will fall out. How to reuse it with high added value has become a difficult problem. Li Xiaolong et al. from MCC Changtian conducted experiments on the regranulation of desulfurization and denitrification activated carbon powder compounded with raw coal to study the influence of the addition of activated carbon powder on the key properties of regranulation. The results show that: qualified desulfurization and denitrification activated carbon can be prepared by compounding activated carbon powder with raw coal, and the key properties can meet the index requirements, providing a new idea for the high added value reuse of activated carbon powder; however, the technical process is complex, the equipment investment is huge, and the performance of the prepared activated carbon is poor.

[0005] Ren Kun et al. from the University of Science and Technology Beijing conducted research on using activated carbon powder from sintering flue gas desulfurization and denitrification for blast furnace injection. The results showed that the activated carbon powder could replace part of the anthracite for blast furnace injection. In addition, bituminous coal is highly explosive, while the activated carbon powder is not. In the mixture of the two, when the mass fraction of the activated carbon powder is greater than 40%, it is not explosive; the combustibility of bituminous coal is better than that of the activated carbon powder, and an anti-synergistic effect will occur after mixing the two. However, adding solid waste activated carbon powder will, on the one hand, reduce the overall combustion performance of the injected coal, and on the other hand, due to the relatively high sulfur and nitrogen content in the solid waste activated carbon powder, it may directly affect the performance of hot metal and subsequent steel products.

[0006] Chinese Patent No. 202010551157.9 discloses a method for using waste activated carbon powder in sintering, a sintering mixture, and a sintered ore. The waste activated carbon powder and coke powder are mixed according to a mass ratio of 12 - 37.8:62.2 - 88 to obtain a sintering fuel; the particle size of the waste activated carbon powder is ≤3 mm, and the mass fraction of the particle size <0.5 mm is 70 - 80%; the particle size of the coke powder is ≤8 mm, and the mass fraction of the particle size <0.5 mm is 10 - 15%; the sintering fuel, the iron ore powder to be sintered, and a flux are mixed to obtain a sintering mixture; the mass ratio of the sintering fuel to the iron ore powder to be sintered is 3 - 6:75 - 90; after granulating the sintering mixture, it is used for sintering. This method simply replaces part of the coke powder with solid waste activated carbon powder without considering the difference in the combustion characteristics between the solid waste activated carbon powder and the coke powder, which is likely to cause inconsistent heat transfer holes and combustion fronts during the sintering process and reduce the sintering ore yield. Summary of the Invention

[0007] The object of the present invention is to overcome the above-mentioned defects existing in the prior art, provide a sintering method using solid waste activated carbon powder, solve the problems of the mismatch in combustion characteristics between the solid waste activated carbon powder and the coke powder and the high sulfur and nitrogen impurity content in the solid waste activated carbon powder affecting the quality of the sintered material ore; in addition, solve the problems of reduced bed permeability caused by thick-bed sintering, over-melting of the bottom sintered ore, and uneven quality of the sintered ore, improve the metallurgical performance indexes of the sintered ore, and realize the large-scale application of solid waste activated carbon powder in sintering production.

[0008] To achieve the above object, the technical solution of the present invention is as follows:

[0009] A sintering method using solid waste activated carbon powder, comprising the following steps:

[0010] (1) Mix fine-ground blast furnace return fines, coal tar pitch powder, and a binder to form mixture A; wherein, in mixture A, the mass fraction of the fine-ground blast furnace return fines is 84% - 90%, the mass fraction of the coal tar pitch powder is 9% - 15%, and the mass fraction of the binder is 0.5% - 2.5%;

[0011] (2) Mix iron concentrate, waste solid activated carbon powder, ammonia inhibitor, and binder to form mixture B. Among them, in mixture B, the mass fraction of iron concentrate is 86% - 92%, the mass fraction of waste solid activated carbon powder is 3% - 6%, the mass fraction of ammonia inhibitor is 2% - 6%, and the mass fraction of binder is 1% - 3%.

[0012] (3) Spray quicklime digestion solution on the surface of the waste solid activated carbon powder and then granulate to form an activated carbon powder core. Using the activated carbon powder core as the pelletizing core, use mixture A as the adhering powder to perform primary pelletizing to form pellet core A. Using pellet core A as the pelletizing core, use mixture B as the adhering powder to perform secondary pelletizing to form a pre-treated activated carbon powder pellet.

[0013] (4) Mix the pre-treated activated carbon powder pellet and coke powder to obtain the upper-layer sintering fuel, and mix and granulate the upper-layer sintering fuel and the upper-layer sintering raw materials to obtain the upper-layer sintering mixture.

[0014] (5) Mix the pre-treated activated carbon powder pellet and coke powder to obtain the lower-layer sintering fuel, and mix and granulate the lower-layer sintering fuel and the lower-layer sintering raw materials to obtain the lower-layer sintering mixture.

[0015] (6) First spread the lower-layer sintering mixture on the sintering pallet, with a spreading height of 600 mm - 700 mm, and perform the first ignition and suction sintering. When the sintering pallet runs to 1 / 5 - 1 / 3 of the total length of the sintering machine, spread the upper-layer sintering mixture on the surface of the sintered ore layer formed, with a spreading height of 400 mm - 500 mm, and perform the second ignition and suction sintering to obtain the finished sintered ore.

[0016] Optionally, in step (3), in the activated carbon powder core, the mass fraction of waste solid activated carbon powder is 90% - 95%, and the mass fraction of quicklime is 5% - 10%. In the pre-treated activated carbon powder pellet, the mass fraction of the activated carbon powder core is 45% - 55%, the mass fraction of mixture A is 25% - 35%, and the mass fraction of mixture B is 15% - 25%.

[0017] Optionally, the diameter of the activated carbon powder core is 3 mm - 6 mm, the diameter of pellet core A is 6 mm - 9 mm, and the diameter of the pre-treated activated carbon powder pellet is 9 mm - 10 mm.

[0018] Optionally, in step (4), in the upper-layer sintering fuel, the mass fraction of the pre-treated activated carbon powder pellet is 25% - 35%, and the mass fraction of coke powder is 65% - 75%. In the upper-layer sintering mixture, the mass fraction of the upper-layer sintering fuel is 4% - 8%, and the mass fraction of the upper-layer sintering raw materials is 92% - 97%.

[0019] Optionally, in step (5), in the lower-layer sintering fuel, the mass fraction of the pelletized activated carbon powder is 35% - 45%, and the mass fraction of the coke powder is 55% - 65%; in the lower-layer sintering mixture, the mass fraction of the lower-layer sintering fuel is 3% - 7%, and the mass fraction of the lower-layer sintering raw material is 93% - 96%.

[0020] Optionally, in step (1), the proportion of the fine-ground blast furnace return fines with a particle size less than 200 mesh is ≥ 85%; the proportion of the coal tar pitch powder with a particle size less than 200 mesh is ≥ 75%.

[0021] Optionally, in step (2), the iron concentrate is a high-iron and low-silica iron concentrate with an iron grade > 65%, a silica mass fraction < 4%, and the proportion of particles with a particle size less than 200 mesh is ≥ 90%; the ammonia-based additive includes urea and / or ammonium bicarbonate, which is sprayed on the surface of the solid waste activated carbon powder in the form of a saturated solution.

[0022] Optionally, in steps (2) and (3), the solid waste activated carbon powder is the waste activated carbon powder generated during the purification of sintering flue gas by the activated carbon desulfurization and denitrification system, with a particle size of 1 mm - 3 mm.

[0023] Optionally, in steps (1) and (2), the binder is an organic binder; the organic binder includes at least one of sodium silicate, sodium humate, sodium carboxymethyl cellulose, and polyacrylamide.

[0024] Optionally, in steps (4) and (5), the upper-layer sintering raw material includes high-crystalline water iron ore powder and a flux, where the mass fraction of the high-crystalline water iron ore powder is 86% - 92%, and the mass fraction of the flux is 8% - 14%; for the high-crystalline water iron ore powder, the mass fraction of the crystalline water is 3% - 10%.

[0025] Optionally, the lower-layer sintering raw material includes high-assimilability temperature iron ore powder and a flux, where the mass fraction of the high-assimilability temperature iron ore powder is 86% - 92%, and the mass fraction of the flux is 8% - 14%; for the high-assimilability temperature iron ore powder, the assimilability temperature is 1260 °C - 1285 °C.

[0026] Optionally, in step (6), the sintering ignition temperatures for both the first ignition and forced-draft sintering and the second ignition and forced-draft sintering are 950 °C - 1050 °C; the forced-draft negative pressures for both the first ignition and forced-draft sintering and the second ignition and forced-draft sintering are 9000 Pa - 16000 Pa.

[0027] Optionally, in step (3), the quicklime digestion liquid is prepared by fully adding water to quicklime in a digester for digestion.

[0028] Implementing the embodiments of the present invention will have the following beneficial effects:

[0029] (1) The present invention provides a sintering method using solid waste activated carbon powder. By pretreating the solid waste activated carbon powder, the solid waste activated carbon powder sprayed with quicklime digestion liquid is used as the core of the ball, and the finely ground blast furnace return ore powder added with coal tar is used as the intermediate layer of adhesion powder for ball making. This solves the problem of mismatch between the combustion characteristics of solid waste activated carbon powder and coke powder, improves the heat transfer performance and mineralization reaction performance of the materials around the solid waste activated carbon powder, reduces the influence of sulfur impurities in the solid waste activated carbon powder on the sintering mineralization process, and reduces solid fuel consumption.

[0030] (2) The present invention pre-treats solid waste activated carbon powder and uses iron ore concentrate with ammonia inhibitor as adhesive powder for secondary balling to form activated carbon powder pre-treated pellets, which can reduce the impact of nitrogen impurities in solid waste activated carbon powder on the sintering process, reduce the content of harmful nitrogen oxides in sintering flue gas, improve the performance of the bonding phase of the sintering material mineralization reaction, and improve the quality of sintered ore.

[0031] (3) The present invention solves the problems of uneven sintered ore quality, over-melting of sintered ore at the bottom, and reduced air permeability of the material layer due to the excessively high material layer by adjusting the addition ratio of activated carbon powder pre-treated pellets in the upper and lower layers; it realizes the application of solid waste activated carbon powder in the sintering process, which can reduce the sintering fuel cost and increase the sintered ore output. DETAILED DESCRIPTION

[0032] The present invention is further described below in conjunction with specific embodiments, but the present invention is not limited in any way.

[0033] Example 1

[0034] A sintering method using solid waste activated carbon powder comprises the following steps:

[0035] S1. Fully mix the blast furnace return ore fine powder, coal tar pitch powder and binder to form a mixture A, wherein the mass fraction of the blast furnace return ore fine powder is 85%, the mass fraction of the coal tar pitch powder is 13.5%, and the mass fraction of the binder is 1.5%. The blast furnace return ore fine powder is obtained by fine grinding the fine-grained sintered return ore under the blast furnace screen, and the mass proportion of the particle size less than 200 mesh is 90%, and the mass proportion of the coal tar pitch particle size less than 200 mesh is 80%.

[0036] S2. Fully mix the iron ore concentrate, solid waste activated carbon powder, ammonia inhibitor and binder to form a mixture B, wherein the mass fraction of the iron ore concentrate is 88%, the mass fraction of the solid waste activated carbon powder is 4.5%, the mass fraction of the ammonia inhibitor is 5.5%, and the mass fraction of the binder is 2%. The solid waste activated carbon powder is the waste activated carbon powder produced when the activated carbon desulfurization and denitrification system purifies the sintering flue gas, and the particle size is 1mm to 3mm.

[0037] Among them, in S1 and S2, the binder is a mixture of sodium carboxymethyl cellulose and polyacrylamide with a mass ratio of 1:1.5; the ammonia inhibitor is ammonium bicarbonate, which is added to the mixture B in the form of a saturated solution. The iron concentrate is a high-iron and low-silica iron concentrate with an iron grade of 66%, a silica mass fraction of 3.5%, and a mass proportion of less than 200 mesh of 90%.

[0038] S3. Uniformly spray the quicklime digestion solution on the solid waste activated carbon powder, and granulate the solid waste activated carbon powder sprayed with the quicklime digestion solution to form the activated carbon powder core. Among them, the mass fraction of the solid waste activated carbon powder is 90%, and the mass fraction of quicklime is 10%; using the activated carbon powder core as the pelletizing core and the mixture A as the adhering powder for primary pelletizing to form the pellet core A; using the pellet core A as the pelletizing core and the mixture B as the adhering powder for secondary pelletizing to form the pre-treated pellet of the activated carbon powder; among them, the diameter of the activated carbon powder core is 3 - 6 mm, the diameter of the pellet core A is 6 - 9 mm, and the diameter of the pre-treated pellet of the activated carbon powder is 9 - 10 mm. In the pre-treated pellet of the activated carbon powder, the mass fraction of the activated carbon powder core is 46%, the mass fraction of the mixture A is 34%, and the mass fraction of the mixture B is 20%.

[0039] S4. Mix the pre-treated pellet of the activated carbon powder and coke powder to obtain the upper-layer sintering fuel, and mix and granulate the upper-layer sintering fuel and the upper-layer sintering raw materials to obtain the upper-layer sintering mixture. In the upper-layer sintering fuel, the mass fraction of the pre-treated pellet of the activated carbon powder is 32%, and the mass fraction of coke powder is 68%; in the upper-layer sintering mixture, the mass fraction of the upper-layer sintering fuel is 6%, and the mass fraction of the upper-layer sintering raw materials is 94%. The upper-layer sintering raw materials include high-crystalline-water iron ore powder and flux, among which the mass fraction of the high-crystalline-water iron ore powder is 88%, and the mass fraction of the flux is 12%; for the high-crystalline-water iron ore powder, the mass fraction of the crystalline water is 7%.

[0040] Mix the pre-treated pellet of the activated carbon powder and coke powder to obtain the lower-layer sintering fuel, and mix and granulate the lower-layer sintering fuel and the lower-layer sintering raw materials to obtain the lower-layer sintering mixture. In the lower-layer sintering fuel, the mass fraction of the pre-treated pellet of the activated carbon powder is 42%, and the mass fraction of coke powder is 58%; in the lower-layer sintering mixture, the mass fraction of the lower-layer sintering fuel is 5%, and the mass fraction of the lower-layer sintering raw materials is 95%. The lower-layer sintering raw materials include high-assimilability-temperature iron ore powder and flux, among which the mass fraction of the high-assimilability-temperature iron ore powder is 90%, and the mass fraction of the flux is 10%; for the high-assimilability-temperature iron ore powder, its assimilability temperature is 1270 °C.

[0041] S5. The lower-layer sintering mixture is first fed onto the sintering machine trolley with a feeding height of 650 mm. It is sintered by the first igniter with suction for the first time, with a suction negative pressure of 9500 Pa and an ignition temperature of 960 °C. When the sintering trolley runs to 1 / 3 of the total length of the sintering machine, the second feeding is carried out on the surface of the sintering ore being sintered, with a feeding height of 400 mm. It is sintered by the second igniter with suction for the second time, with a suction negative pressure of 14000 Pa and an ignition temperature of 1000 °C to obtain the finished sintered ore.

[0042] After the application of the present invention, the desulfurized and denitrified solid waste activated carbon powder is applied to sintering production. The solid fuel consumption in sintering is reduced from 46.2 kg / t to 40.5 kg / t, and the utilization coefficient is increased from 1.329 t / h·m 2 to 1.623 t / h·m 2 ; the tumbler strength of the sintered ore is increased from 80.6% to 85.2%, and the reducibility is increased from 82.3% to 87.2%.

[0043] Example 2

[0044] A sintering method using solid waste activated carbon powder includes the following steps:

[0045] S1. The fine-ground powder of blast furnace return ore, coal tar pitch powder and binder are fully mixed to form mixture A, where the mass fraction of the fine-ground powder of blast furnace return ore is 88%, the mass fraction of coal tar pitch powder is 10%, and the mass fraction of the binder is 2%. The fine-ground powder of blast furnace return ore is obtained by fine-grinding the fine-grained sintered return ore screened from the blast furnace, and the proportion of its particle size less than 200 mesh is 92%, and the mass proportion of the particle size of coal tar pitch powder less than 200 mesh is 85%.

[0046] S2. Iron ore concentrate, solid waste activated carbon powder, ammonia inhibitor and binder are fully mixed to form mixture B, where the mass fraction of iron ore concentrate is 90%, the mass fraction of solid waste activated carbon powder is 3.5%, the mass fraction of ammonia inhibitor is 5%, and the mass fraction of the binder is 1.5%. The solid waste activated carbon powder is the waste activated carbon powder generated when the sintering flue gas is purified by the activated carbon desulfurization and denitrification system, with a particle size of 1 mm - 3 mm.

[0047] Among them, in S1 and S2, the binder is sodium humate, and the ammonia inhibitor is urea, which is added to mixture B in the form of a saturated solution. The iron ore concentrate is high-iron and low-silicon iron ore concentrate, with an iron grade of 67%, a mass fraction of silicon dioxide of 3%, and the mass proportion of its particle size less than 200 mesh is 92%.

[0048] S3. Uniformly spray the quicklime digestion solution on the solid waste activated carbon powder, and granulate the solid waste activated carbon powder sprayed with the quicklime digestion solution to form an activated carbon powder core. Among them, the mass fraction of the solid waste activated carbon powder is 95%, and the mass fraction of the quicklime is 5%; taking the activated carbon powder core as the pelletizing core and mixture A as the adhering powder for primary pelletizing to form pellet core A; taking pellet core A as the pelletizing core and mixture B as the adhering powder for primary pelletizing to form the pretreated activated carbon powder pellet; among them, the diameter of the activated carbon powder core is 3 - 6 mm, the diameter of pellet core A is 6 - 9 mm, and the diameter of the pretreated activated carbon powder pellet is 9 - 10 mm. In the pretreated activated carbon powder pellet, the mass fraction of the activated carbon powder core is 52%, the mass fraction of mixture A is 30%, and the mass fraction of mixture B is 18%.

[0049] S4. Mix the pretreated activated carbon powder pellet and coke powder to obtain the upper-layer sintering fuel, and mix and granulate the upper-layer sintering fuel and the upper-layer sintering raw materials to obtain the upper-layer sintering mixture. In the upper-layer sintering fuel, the mass fraction of the pretreated activated carbon powder pellet is 28%, and the mass fraction of the coke powder is 72%; in the upper-layer sintering mixture, the mass fraction of the upper-layer sintering fuel is 5.5%, and the mass fraction of the upper-layer sintering raw materials is 94.5%. The upper-layer sintering raw materials include high-crystalline water iron ore powder and flux, among which the mass fraction of the high-crystalline water iron ore powder is 91%, and the mass fraction of the flux is 9%; for the high-crystalline water iron ore powder, the mass fraction of its crystal water is 8%.

[0050] Mix the pretreated activated carbon powder pellet and coke powder to obtain the lower-layer sintering fuel, and mix and granulate the lower-layer sintering fuel and the lower-layer sintering raw materials to obtain the lower-layer sintering mixture. In the lower-layer sintering fuel, the mass fraction of the pretreated activated carbon powder pellet is 37%, and the mass fraction of the coke powder is 63%; in the lower-layer sintering mixture, the mass fraction of the lower-layer sintering fuel is 4%, and the mass fraction of the lower-layer sintering raw materials is 96%. The lower-layer sintering raw materials include high-assimilability temperature iron ore powder and flux, among which the mass fraction of the high-assimilability temperature iron ore powder is 88%, and the mass fraction of the flux is 12%; for the high-assimilability temperature iron ore powder, its assimilability temperature is 1260 °C.

[0051] S5. First, spread the lower-layer sintering mixture on the sintering machine trolley, with a spreading height of 700 mm; conduct the first ignition and suction sintering by the first igniter, with a suction negative pressure of 11000 pa and an ignition temperature of 980 °C; when the sintering trolley runs to 1 / 5 of the total length of the sintering machine, conduct the second spreading on the surface of the sintered ore being sintered, with a spreading height of 450 mm; conduct the second ignition and suction sintering by the second igniter, with a suction negative pressure of 16000 Pa and an ignition temperature of 1030 °C; obtain the finished sintered ore.

[0052] After the application of the present invention, the desulfurized and denitrified solid waste activated carbon powder is applied to sintering production. The solid fuel consumption of sintering is reduced from 45.8 kg / t to 39.5 kg / t, and the utilization coefficient is increased from 1.335 t / h.m 2 to 1.716 t / h.m 2 ; the drum strength of sinter is increased from 81.2% to 86.4%, and the reducibility is increased from 83.1% to 87.9%.

[0053] The above embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A sintering method using solid waste activated carbon powder, characterized in that: The following steps are involved: (1) Mixing finely ground blast furnace ore, coal tar pitch powder and a binder to form a mixture A; wherein the mass fraction of the finely ground blast furnace ore is 84% ​​to 90%, the mass fraction of the coal tar pitch powder is 9% to 15%, and the mass fraction of the binder is 0.5% to 2.5%; (2) mixing iron ore concentrate, solid waste activated carbon powder, ammonia inhibitor and binder to form a mixture B; wherein the mass fraction of the iron ore concentrate in the mixture B is 86% to 92%, the mass fraction of the solid waste activated carbon powder is 3% to 6%, the mass fraction of the ammonia inhibitor is 2% to 6%, and the mass fraction of the binder is 1% to 3%; (3) spraying quicklime digestion liquid on the surface of solid waste activated carbon powder and then granulating to form an activated carbon powder core; using the activated carbon powder core as the ball core, using the mixed material A as the adhesive powder to perform a primary granulation to form a pellet core A; using the pellet core A as the ball core, using the mixed material B as the adhesive powder to perform a secondary granulation to form an activated carbon powder pre-treated pellet; (4) mixing the activated carbon powder pretreated pellets and coke powder to obtain an upper sintering fuel, and mixing and granulating the upper sintering fuel and the upper sintering raw materials to obtain an upper sintering mixed material; (5) mixing the activated carbon powder pretreated pellets and coke powder to obtain a lower-layer sintering fuel, and mixing and granulating the lower-layer sintering fuel and the lower-layer sintering raw materials to obtain a lower-layer sintering mixture; (6) The lower layer of sintering mixture is first added to the sintering trolley at a height of 600 mm to 700 mm, and the first ignition and ventilation sintering is performed; when the sintering trolley runs to 1 / 5 to 1 / 3 of the total length of the sintering machine, the upper layer of sintering mixture is added to the surface of the sintered ore layer formed at a height of 400 mm to 500 mm, and the second ignition and ventilation sintering is performed to obtain a finished sintered ore.

2. The sintering method using solid waste activated carbon powder according to claim 1, characterized in that: In step (3), in the activated carbon powder core, the mass fraction of solid waste activated carbon powder is 90% to 95%, and the mass fraction of quicklime is 5% to 10%; In the activated carbon powder pretreated pellets, the mass fraction of the activated carbon powder inner core is 45% to 55%, the mass fraction of the mixed material A is 25% to 35%, and the mass fraction of the mixed material B is 15% to 25%.

3. The sintering method using solid waste activated carbon powder according to claim 2, characterized in that: The diameter of the activated carbon powder core is 3 mm to 6 mm, the diameter of the pellet core A is 6 mm to 9 mm, and the diameter of the activated carbon powder pretreated pellet is 9 mm to 10 mm.

4. The sintering method using solid waste activated carbon powder according to claim 1, characterized in that: In step (4), in the upper layer of sintering fuel, the mass fraction of activated carbon powder pre-treated pellets is 25% to 35%, and the mass fraction of coke powder is 65% to 75%; In the upper layer sintering mixed material, the mass fraction of the upper layer sintering fuel is 4% to 8%, and the mass fraction of the upper layer sintering raw material is 92% to 97%.

5. The sintering method using solid waste activated carbon powder according to claim 1, characterized in that: In step (5), in the lower layer sintering fuel, the mass fraction of activated carbon powder pre-treated pellets is 35% to 45%, and the mass fraction of coke powder is 55% to 65%; In the lower layer sintering mixed material, the mass fraction of the lower layer sintering fuel is 3% to 7%, and the mass fraction of the lower layer sintering raw material is 93% to 96%.

6. The sintering method using solid waste activated carbon powder according to claim 1, characterized in that: In step (1), the particle size of the blast furnace return ore fine powder is less than 200 mesh, accounting for ≥85% by weight; The coal tar powder has a particle size of less than 200 meshes and a mass proportion of ≥75%.

7. The sintering method using solid waste activated carbon powder according to claim 1, characterized in that: In step (2), the iron concentrate is a high-iron, low-silicon iron concentrate, with an iron grade of >65%, a silicon dioxide mass fraction of <4%, and a mass fraction of particles less than 200 meshes of ≥90%; The ammonia additive includes urea and / or ammonium bicarbonate, which is sprayed on the surface of the solid waste activated carbon powder in the form of a saturated solution.

8. The sintering method using solid waste activated carbon powder according to claim 1, characterized in that: In step (2) and step (3), the solid waste activated carbon powder is waste activated carbon powder generated when an activated carbon desulfurization and denitrification system purifies sintering flue gas, and the particle size is 1 mm to 3 mm; In step (1) and step (2), the binder is an organic binder; the organic binder includes at least one of water glass, sodium humate, sodium carboxymethyl cellulose and polyacrylamide; In step (4) and step (5), the upper sintering raw materials include high-crystallized water iron ore powder and flux, wherein the mass fraction of the high-crystallized water iron ore powder is 86% to 92%, and the mass fraction of the flux is 8% to 14%; the mass fraction of crystal water of the high-crystallized water iron ore powder is 3% to 10%. The lower layer sintering raw materials include high assimilative temperature iron ore powder and flux, wherein the mass fraction of the high assimilative temperature iron ore powder is 86% to 92%, and the mass fraction of the flux is 8% to 14%; the high assimilative temperature iron ore powder has an assimilative temperature of 1260°C to 1285°C.

9. The sintering method using solid waste activated carbon powder according to claim 1, characterized in that: In step (6), the sintering ignition temperature of the first ignition and exhaust sintering and the second ignition and exhaust sintering are both 950° C. to 1050° C.; The exhaust negative pressure of the first ignition exhaust sintering and the second ignition exhaust sintering are both 9000Pa to 16000Pa.

10. The sintering method using solid waste activated carbon powder according to claim 1, characterized in that: In step (3), the quicklime digestion liquid is obtained by fully digesting quicklime with water in a digester.