CDQ cold-pressed pellet and sintering method and sintering system adopting CDQ cold-pressed pellet

Abstract

The invention discloses a CDQ cold-pressed pellet and a sintering method and a sintering system adopting the CDQ cold-pressed pellet, CDQ powder, limonite, sintering return mine and flux are mixed for pelletizing, and the large-particle CDQ cold-pressed pellet with excellent strength performance can be obtained by controlling the composition content of each raw material. The CDQ cold-pressed pellets can be directly distributed and sintered together with a granulation mixture, and the problems that the granulation process of sintering raw materials is affected due to the fact that CDQ powder is fine in granularity, poor in sintering uniformity after being directly added and poor in hydrophilicity, the air permeability of a material layer is reduced, FeO of sintered ore fluctuates, balance and stability of heat in the sintering process cannot be guaranteed, and the sintering quality is affected can be effectively solved. The sintering process and sintering ore components fluctuate, the sintering ore strength is reduced, the sintering utilization rate is reduced, and the sintering solid fuel consumption is increased. The process is simple, the investment cost is low, cyclic utilization of CDQ powder resources can be achieved, and the sintering production cost is remarkably reduced.

Description

Technical Field

[0001] The present invention relates to CDQ coupled sintering technology, and specifically to a CDQ cold-pressed pellet, a sintering method and a sintering system using the same, belonging to the technical field of CDQ sintering technology. Background Art

[0002] CDQ powder is the dedusted ash collected by the dry quenching coke system in the coking process, which is a carbon-containing solid waste in the coking plant. It is characterized by a high fixed carbon content and a low volatile content. To ensure no environmental pollution and reduce waste of resources, due to its high fixed carbon and calorific value, the current application methods of CDQ powder generally include: transporting it to the sintering yard as a sintering solid fuel, replacing part of the pulverized coal used for blast furnace injection with CDQ powder, recycling and participating in coal blending for coking, and mixing with iron-containing raw materials and cold pressing into iron coke for use in the blast furnace, etc., so as to comprehensively utilize the waste in the production process and avoid secondary pollution.

[0003] Regarding the direct participation of CDQ powder in the batching for sintering production as a substitute for fuel, due to the fine particle size of CDQ powder and short combustion flame, the following problems are likely to occur during use: incomplete combustion is likely to occur during sintering; the uniformity of direct blending is poor; the hydrophilicity of CDQ powder is relatively poor, which affects the granulation process of sintering raw materials, resulting in a decrease in the permeability of the material layer, causing fluctuations in FeO of the sintered ore, unable to ensure the heat balance and stability during the sintering process, resulting in fluctuations in the sintering process, and affecting the quality and output of the sintered ore; its particle size is too fine, and it is easily sucked into the main flue during the air extraction process, resulting in a decrease in utilization rate and an increase in sintering solid fuel consumption. It can be seen that consuming CDQ powder in the existing sintering production is likely to cause violent fluctuations in the sintering process, and inevitably negative impacts such as fluctuations in the composition of the sintered ore and a decrease in the strength of the sintered ore will occur. Summary of the Invention

[0004] Aiming at the problem that the direct participation of CDQ powder in batching in the prior art is likely to lead to a reduction in the quality of the sintered ore, the present invention provides a CDQ cold-pressed pellet, a sintering method and a sintering system for coupled sintering using the CDQ cold-pressed pellet. By mixing CDQ powder with limonite, sinter return fines, fluxes, etc., pressing them into pellets, and then performing coupled sintering with the sintering granulation mixture, it is possible to achieve efficient utilization of CDQ powder while ensuring the stable quality of the sintered ore, and at the same time, significantly reduce the consumption of sintering solid fuel.

[0005] To achieve the above technical objectives, the technical solutions adopted by the present invention are described as follows: According to the first embodiment of the present invention, a CDQ cold-pressed pellet is provided: A CDQ cold-pressed pellet, which is prepared by the following method: first mix CDQ powder, limonite, sinter return fines, and fluxes, then add water and mix evenly, and finally press to obtain the CDQ cold-pressed pellet.

[0006] Preferably, the mixing mass ratio of the CDQ powder, limonite, sinter return fines, and flux is 1:15-25:5-10:2.5-5.5, preferably 1:16-22:5.5-8:3-5.

[0007] Preferably, the particle size of the CDQ cold-compressed pellets is 10-30 mm, the water content is 6-10 wt%, the drop strength is 4-8 times / 0.5 m, and the compressive strength is 50-150 N / piece.

[0008] Preferably, the limonite includes one or more of Xiao Yangdi powder, Ultra Special powder, and King powder or is composed of one or more of Xiao Yangdi powder, Ultra Special powder, and King powder.

[0009] Preferably, the flux includes one or more of limestone, dolomite, and quicklime or is composed of one or more of limestone, dolomite, and quicklime.

[0010] According to the second embodiment of the present invention, a sintering method based on CDQ cold-compressed pellets is provided: A sintering method based on CDQ cold-compressed pellets, the method comprising the following steps: 1) First, weigh fuel, iron ore blended material, sinter return fines, and flux according to the composition of the CDQ cold-compressed pellets described in the first embodiment to obtain a mixed material, and then add water to the mixed material and granulate to obtain a granulated mixed material.

[0011] 2) Mix and distribute the granulated mixed material and the CDQ cold-compressed pellets described in the first embodiment and sinter them. After sintering, sintered ore is obtained.

[0012] Preferably, in step 1), in the CDQ cold-compressed pellets and the granulated mixed material, the total usage mass ratio of fuel, iron ore blended material, sinter return fines, and flux is 0.6-0.9:14-16:5-7:2-4, preferably 0.7-0.8:14-16:5-7:2-4.

[0013] Preferably, in step 2), the input amount of the CDQ cold-compressed pellets is such that the heat carried by the CDQ cold-compressed pellets is 10-40% of the total heat carried by the granulated mixed material and the CDQ cold-compressed pellets, preferably 20-30%.

[0014] That is to say, if the fuel consumption in the conventional sintering batching scheme is defined as 1, then in the CDQ cold-pressed pellets, the dosage of CDQ powder is such that the heat it can provide is equivalent to 0.1 - 0.4 times the heat that the fuel can provide in the conventional scheme, and the heat that the fuel in the granulated mixture needs to provide is only 0.6 - 0.9 times the heat that the fuel can provide in the conventional scheme. For example, if the total heat that needs to be released by the fuel added in the conventional sintering process is 100 KJ, and the heat that the CDQ powder in the CDQ cold-pressed pellets prepared by the present invention can release during sintering is 30 KJ, then the amount of fuel added to the granulated mixture of the present invention needs to satisfy that it can release 70 KJ of heat during sintering.

[0015] Preferably, in step 1), the fuel includes one or more of pulverized coal, coke powder, and semi-coke powder or is composed of one or more of pulverized coal, coke powder, and semi-coke powder.

[0016] Preferably, in step 1), the iron ore blended material includes one or more of hematite powder, magnetite powder, and limonite powder or is composed of one or more of hematite powder, magnetite powder, and limonite powder.

[0017] Preferably, in step 1), the flux includes one or more of limestone, dolomite, and quicklime or is composed of one or more of limestone, dolomite, and quicklime.

[0018] Preferably, in step 1), the granulated mixture has a particle size of 8 - 20 mm and a water content of 5 - 8 wt%.

[0019] According to the third embodiment of the present invention, a sintering system based on CDQ cold-pressed pellets is provided: A sintering system based on CDQ cold-pressed pellets, which includes a CDQ cold-pressed pellet production unit, a granulated mixture production unit, and a sintering unit. The CDQ cold-pressed pellet production unit includes a pellet batching mechanism, a first mixer, a pellet press, a screening machine, and a cold-pressed pellet conveying device connected in series in sequence. The granulated mixture production unit includes a granulation batching mechanism, a second mixer, a granulator, and a granulated mixture conveying device connected in series in sequence. The sintering unit includes a feeding machine and a sintering machine connected in series in sequence. The discharge ends of the cold-pressed pellet conveying device and the granulated mixture conveying device are both connected to the feeding end of the feeding machine.

[0020] Preferably, the coarse material outlet of the screening machine is connected to the feeding end of the cold-pressed pellet conveying device, and the fine material outlet of the screening machine is connected to the feeding end of the first mixer through a fine material return device.

[0021] Preferably, the pellet batching mechanism includes a CDQ powder bin, a limonite bin, a first return ore bin, a first flux bin, and a first raw material conveyor. The CDQ powder bin, the limonite bin, the first return ore bin, and the first flux bin are arranged in parallel, and the CDQ powder bin, the limonite bin, the first return ore bin, and the first flux bin are all connected to the feed end of the first raw material conveyor through independent first feeders. The discharge end of the first raw material conveyor is connected to the feed end of the first mixer.

[0022] Preferably, the pelletizing batching mechanism includes a solid fuel bin, an iron ore homogenized material bin, a second return ore bin, a second flux bin, and a second raw material conveyor. The solid fuel bin, the iron ore homogenized material bin, the second return ore bin, the second flux bin, and the second raw material conveyor are arranged in parallel, and the solid fuel bin, the iron ore homogenized material bin, the second return ore bin, the second flux bin, and the second raw material conveyor are all connected to the feed end of the second raw material conveyor through independent second feeders. The discharge end of the second raw material conveyor is connected to the feed end of the second mixer.

[0023] Preferably, the first raw material conveyor, the second raw material conveyor, the cold-pressed pellet conveyor, the fine material return conveyor, and the pelletizing mixture conveyor are each independently one of a belt conveyor, a chain conveyor, a feeding chute, or a chute pipe.

[0024] Preferably, the first feeder and the second feeder are each independently a disk feeder or a round roll feeder.

[0025] Preferably, the distributor is a nine-roll distributor.

[0026] Preferably, the screening machine is a vibrating bar screen or a vibrating mesh screen.

[0027] Preferably, the sintering system further includes a control device, which is electrically connected to other components in a wired or wireless manner, and controls the start and stop of each component through the control device. Preferably, the control device is a PLC controller.

[0028] In the prior art, due to the fine particle size and poor hydrophilicity of CDQ powder, it is difficult to form pellets, the pellet strength is low, and it is easy to be pulverized. It is very difficult to prefabricate it into larger pellets (close to the particle size of the sintering granulation mixture) alone. Often, a large amount of binder (such as bentonite, etc.) needs to be added. However, the introduction of too much binder is not conducive to sintering (it easily causes a decrease in the iron grade of sintered ore). Therefore, in order to reduce the use amount of the binder, CDQ powder can only be prefabricated into smaller particles, and then mixed with the conventional sintering primary mixing material and subjected to secondary mixing granulation to obtain the sintering granulation mixture for sintering. That is, there is a process of secondary mixing granulation, which will not only greatly increase the production cost, but also cause a certain degree of reduction in the iron grade of sintered ore due to the still need to add a considerable amount of binder. In view of the above problems, through research, the present invention finds that large-particle pellets made by mixing CDQ powder, limonite, return fines and fluxes in a certain proportion and adding a certain amount of water for cold pressing have high strength and meet the requirements of mixed sintering, that is, they can be spread and sintered together with the prefabricated sintering granulation mixture. On the one hand, it can realize the efficient utilization of CDQ powder, on the other hand, it can significantly reduce the fuel input amount in the sintering granulation mixture, reduce the production cost, and have almost no influence on the quality of sintered ore, and even have a certain improvement effect on some properties of sintered ore.

[0029] In the present invention, through a large number of practical studies, it is found that when CDQ powder, limonite, return fines and fluxes are proportioned by mass ratio of 1:15~25:5~10:2.5~5.5 (preferably 1:16~22:5.5~8:3~5), and at the same time, water is added for pressing the pellets according to the water content of CDQ cold-pressed pellets being 6~10 wt% (mass content), high-quality CDQ cold-pressed pellets with a particle size of 10~30 mm, a drop strength of 4~8 times / 0.5 m, and a compressive strength of 50~150 N / piece can be obtained. Among them, the limonite includes one or more of Xiaoyangdi powder, Ultra Special powder, and King powder, which can be used as a viscous material to improve the pelletizing performance, improve the drop strength and compressive strength of the agglomerate, and because it itself also contains a large amount of iron, it will not cause a decrease in the iron grade of sintered ore; the sintering return fines are used as the aggregate of the cold-pressed pellets to improve the compressive strength of the agglomerate. It should be noted that through research, it is found that too large or too small proportions of each component in the CDQ cold-pressed pellets will affect the strength of the CDQ cold-pressed pellets. That is, the present invention can obtain CDQ cold-pressed pellets with larger strength and coarser particle size without adding conventional binders (such as bentonite, etc.), and can directly participate in sintering without affecting the quality fluctuation of sintered ore.

[0030] In the present invention, when the CDQ cold-pressed pellets are coupled with the sintering granulation mixture for sintering, since the CDQ powder itself contains a considerable amount of fixed carbon, it can replace part of the fuel of the conventional sintering ingredients to provide heat for the sintering process, that is, when CDQ cold-pressed pellets are added for coupled sintering, the amount of fuel added to the sintering granulation mixture can be reduced; and after research, it is found that when the heat released by the fixed carbon in the CDQ cold-pressed pellets during the sintering process accounts for 10-40% (preferably 20-30%) of the total heat released by the total fuel in all sintering materials (CDQ cold-pressed pellets and sintering granulation mixture) during the sintering process, the efficient utilization of CDQ powder can be achieved while ensuring the stability of the sintered ore quality, and the amount of fuel added to the conventional sintering granulation mixture can be significantly reduced (that is, the amount of fuel added to the sintering granulation mixture of the present invention is less than the amount of fuel added to the conventional sintering granulation mixture, and the amount of fuel added to the sintering granulation mixture of the present invention is only 60-90% of the amount of fuel added to the conventional sintering granulation mixture). If the amount of CDQ cold-pressed pellets added during coupled sintering is too low, the proportion of heat they contain is too small, and the economic benefits are low. If the amount of CDQ cold-pressed pellets added during coupled sintering is too large, the proportion of heat they contain is too large, which will affect the quality of the sintered ore. Keeping the proportion of CDQ cold-pressed pellets added within an appropriate range can ensure both economic benefits and the quality of the sintered ore. Generally, when coupled sintering is required, first pre-weigh the fuel, iron ore mixture, sintering return ore and flux according to the ratio of conventional sintering ingredients (for example, the mass ratio of fuel: iron ore mixture: sintering return ore: flux is 1:14~16:5~7:2~4) for use, and then calculate the mass of the fuel that can be replaced by CDQ powder based on the principle of equal heat (generally 10~40% of the mass of the initially weighed fuel, preferably 20~30%) and further calculate the mass of the fuel that can be replaced by CDQ powder based on the replaceable part. The amount of CDQ powder is calculated based on the heat content of the calculated fuel. Then, when preparing CDQ cold-pressed pellets, the ingredients are mixed according to the calculated amount of CDQ powder and the set ratio of CDQ powder, limonite, sintered return ore and flux. When preparing sintered granulation mixture, the pre-weighed fuel needs to be reduced by the mass of the fuel that can be replaced by CDQ powder before mixing the pellets. The pre-weighed sintered return ore and flux also need to be reduced by the amount used in CDQ cold-pressed pellets before mixing the pellets. That is to say, during coupled sintering, the amount of fuel in the sintering material composed of CDQ cold-pressed pellets and granulated mixture is reduced relative to the amount of conventional sintering ingredients, while the total amount of iron ore mixture, sintering return ore and flux is consistent with the amount of conventional sintering ingredients, that is, the mass ratio of fuel: iron ore mixture: sintering return ore: flux in the coupled sintering process is 0.6~0.9:14~16:5~7:2~4 (preferably 0.7~0.8:14~16:5~7:2~4).

[0031] In the present invention, a supporting sintering system for coupled sintering is also provided, mainly including a CDQ cold-pressed pellet production unit, a granulated mixture production unit, a sintering unit, etc. The CDQ cold-pressed pellet production unit includes a raw material bin, a mixer, a pellet press, a screening machine, and a feeding device between each component. Through the combined action of each component, CDQ cold-pressed pellets that meet the requirements of coupled sintering can be directly obtained. The granulated mixture production unit is a conventional granulated mixture production system, including a raw material bin, a mixer, a granulator, and a feeding device between components. Through the combined action of each component, a granulated mixture that meets the requirements of coupled sintering can be directly obtained. During coupled sintering, the CDQ cold-pressed pellets and the granulated mixture are sequentially fed into a feeder, and the feeder feeds all the raw materials into a nine-roll distributor. After passing through the nine-roll distributor, particle size segregation of the raw materials is achieved. The larger-sized CDQ cold-pressed pellets and the larger-sized granulated mixture are distributed below, and the smaller-sized granulated mixture is distributed above. Overall, vertical segregation of particle size on the sintering pallet is achieved, improving the air permeability of the sintering material layer. At the same time, the automatic reheating phenomenon of the sintering material layer can be effectively utilized to ensure the high-temperature consolidation reaction of the CDQ cold-pressed pellets, thereby ensuring the quality of the sinter.

[0032] Compared with the prior art, the beneficial technical effects of the present invention are as follows: 1: In the present invention, CDQ powder, limonite, sinter return fines, and fluxes are mixed and pelletized. By controlling the composition content of each raw material, large-sized CDQ cold-pressed pellets with excellent strength performance can be obtained, providing technical support for the coupled sintering of CDQ cold-pressed pellets and conventional sintered granulated mixtures.

[0033] 2: In the present invention, the CDQ cold-pressed pellets and the granulated mixture are used for feeding and sintering together, which can effectively solve a series of problems caused by the fine particle size of CDQ powder, poor uniformity of direct blending into the sinter, poor hydrophilicity of CDQ powder, affecting the granulation process of sintering raw materials, resulting in a decrease in the air permeability of the material layer, causing fluctuations in FeO of the sinter, unable to ensure the heat balance and stability during the sintering process, resulting in fluctuations in the sintering process and the composition of the sinter, a decrease in the strength of the sinter, a decrease in sinter utilization rate, and an increase in sinter solid fuel consumption. The process of the present invention is simple and the investment cost is low. It can realize the recycling of CDQ powder resources and significantly reduce the sintering production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a simplified process flow diagram of the sintering method described in the present invention.

[0035] Figure 2 It is a structural schematic diagram of the sintering system described in the present invention.

[0036] Figure 3 It is an overall structural schematic diagram of the sintering system described in the present invention.

[0037] Reference Signs: 1: Pellet Batching Mechanism; 101: CDQ Powder Bin; 102: Limonite Bin; 103: First Return Ore Bin; 104: First Flux Bin; 105: First Raw Material Conveyor; 2: First Mixer; 3: Pellet Press; 4: Screening Machine; 5: Cold Pellet Conveyor; 6: Fine Material Return Device; 7: Granulation Batching Mechanism; 701: Solid Fuel Bin; 702: Iron Ore Blending Bin; 703: Second Return Ore Bin; 704: Second Flux Bin; 705: Second Raw Material Conveyor; 8: Second Mixer; 9: Granulator; 10: Granulation Mixture Conveyor; 11: Distributor. Detailed Embodiment

[0038] The technical solutions of the present invention will be illustrated by way of example below. The scope of protection claimed by the present invention includes but is not limited to the following embodiments.

[0039] A sintering system based on CDQ cold pellets, the sintering system includes a CDQ cold pellet production unit, a granulation mixture production unit, and a sintering unit. The CDQ cold pellet production unit includes a pellet batching mechanism 1, a first mixer 2, a pellet press 3, a screening machine 4, and a cold pellet conveyor 5 connected in series in sequence. The granulation mixture production unit includes a granulation batching mechanism 7, a second mixer 8, a granulator 9, and a granulation mixture conveyor 10 connected in series in sequence. The sintering unit includes a distributor 11 and a sintering machine 12 connected in series in sequence. The discharge ends of the cold pellet conveyor 5 and the granulation mixture conveyor 10 are both connected to the feed end of the distributor 11.

[0040] Preferably, the coarse material outlet of the screening machine 4 is connected to the feed end of the cold pellet conveyor 5, and the fine material outlet of the screening machine 4 is connected to the feed end of the first mixer 2 through a fine material return device 6.

[0041] Preferably, the pellet batching mechanism 1 includes a CDQ powder bin 101, a limonite bin 102, a first return ore bin 103, a first flux bin 104, and a first raw material conveyor 105. The CDQ powder bin 101, the limonite bin 102, the first return ore bin 103, and the first flux bin 104 are arranged in parallel, and the CDQ powder bin 101, the limonite bin 102, the first return ore bin 103, and the first flux bin 104 are all connected to the feed end of the first raw material conveyor 105 through independent first feeders 106, and the discharge end of the first raw material conveyor 105 is connected to the feed end of the first mixer 2.

[0042] Preferably, the granulation batching mechanism 7 includes a solid fuel bin 701, an iron ore homogenized material bin 702, a second return ore bin 703, a second flux bin 704, and a second raw material conveying device 705. The solid fuel bin 701, the iron ore homogenized material bin 702, the second return ore bin 703, the second flux bin 704, and the second raw material conveying device 705 are arranged in parallel, and the solid fuel bin 701, the iron ore homogenized material bin 702, the second return ore bin 703, the second flux bin 704, and the second raw material conveying device 705 are all connected to the feed end of the second raw material conveying device 705 through independent second feeders 706. The discharge end of the second raw material conveying device 705 is connected to the feed end of the second mixer 8. Example 1

[0043] As Figure 2-3 shown, a sintering system based on CDQ cold-pressed pellets includes a CDQ cold-pressed pellet production unit, a granulated mixture production unit, and a sintering unit. The CDQ cold-pressed pellet production unit includes a pellet batching mechanism 1, a first mixer 2, a pellet press 3, a screening machine 4, and a cold-pressed pellet conveying device 5 connected in series in sequence. The granulated mixture production unit includes a granulation batching mechanism 7, a second mixer 8, a granulator 9, and a granulated mixture conveying device 10 connected in series in sequence. The sintering unit includes a distributing machine 11 and a sintering machine 12 connected in series in sequence. The discharge ends of the cold-pressed pellet conveying device 5 and the granulated mixture conveying device 10 are both connected to the feed end of the distributing machine 11. Example 2

[0044] Repeat Example 1, except that the coarse material outlet of the screening machine 4 is connected to the feed end of the cold-pressed pellet conveying device 5, and the fine material outlet of the screening machine 4 is connected to the feed end of the first mixer 2 through a fine material return device 6. Example 3

[0045] Repeat Example 2, except that the pellet batching mechanism 1 includes a CDQ powder bin 101, a limonite bin 102, a first return ore bin 103, a first flux bin 104, and a first raw material conveying device 105. The CDQ powder bin 101, the limonite bin 102, the first return ore bin 103, the first flux bin 104 are arranged in parallel, and the CDQ powder bin 101, the limonite bin 102, the first return ore bin 103, the first flux bin 104 are all connected to the feed end of the first raw material conveying device 105 through independent first feeders 106. The discharge end of the first raw material conveying device 105 is connected to the feed end of the first mixer 2. Example 4

[0046] Repeat Example 3, except that the granulation batching mechanism 7 includes a solid fuel bin 701, an iron ore blended material bin 702, a second return ore bin 703, a second flux bin 704, and a second raw material conveying device 705. The solid fuel bin 701, the iron ore blended material bin 702, the second return ore bin 703, the second flux bin 704, and the second raw material conveying device 705 are arranged in parallel, and the solid fuel bin 701, the iron ore blended material bin 702, the second return ore bin 703, the second flux bin 704, and the second raw material conveying device 705 are all connected to the feeding end of the second raw material conveying device 705 through independent second feeders 706, and the discharging end of the second raw material conveying device 705 is connected to the feeding end of the second mixer 8.

[0047] Preparation Example 1 Preparation of CDQ cold-pressed pellets: Mix 17.9 parts by mass of Xiaoyangdi powder, 6.0 parts by mass of Chaote powder, and 9.0 parts by mass of King powder to obtain limonite; mix 4.0 parts by mass of limestone powder, 4.3 parts by mass of dolomite powder, and 3.2 parts by mass of quicklime to obtain flux; Mix CDQ powder, limonite, sintered return ore, and flux in a mass ratio of 1:15:5:2.5 and add water (the addition amount of water is 8% of the total mass of the pelletizing mixture) to obtain a pelletizing mixture, send the pelletizing mixture into a pellet press for pelletizing treatment, and then perform screening to obtain CDQ cold-pressed pellets with an average particle size of about 15 mm.

[0048] Preparation Example 2 Preparation of CDQ cold-pressed pellets: Mix 17.9 parts by mass of Xiaoyangdi powder, 6.0 parts by mass of Chaote powder, and 9.0 parts by mass of King powder to obtain limonite; mix 4.0 parts by mass of limestone powder, 4.3 parts by mass of dolomite powder, and 3.2 parts by mass of quicklime to obtain flux; Mix CDQ powder, limonite, sintered return ore, and flux in a mass ratio of 1:16:5:3 and add water (the addition amount of water is 8% of the total mass of the pelletizing mixture) to obtain a pelletizing mixture, send the pelletizing mixture into a pellet press for pelletizing treatment, and then perform screening to obtain CDQ cold-pressed pellets with an average particle size of about 15 mm.

[0049] Preparation Example 3 Preparation of CDQ cold-pressed pellets: Mix 17.9 parts by mass of Xiaoyangdi powder, 6.0 parts by mass of Chaote powder, and 9.0 parts by mass of King powder to obtain limonite; mix 4.0 parts by mass of limestone powder, 4.3 parts by mass of dolomite powder, and 3.2 parts by mass of quicklime to obtain flux; Mix CDQ powder, limonite, sinter return fines, and flux in a mass ratio of 1:18.5:5.5:4 and add water (the added amount of water is 8% of the total mass of the pelletizing mixture) to obtain a pelletizing mixture. Feed the pelletizing mixture into a briquetting machine for pelletizing, and then perform screening to obtain CDQ cold-pressed pellets with an average particle size of about 20 mm.

[0050] Preparation Example 4 Preparation of CDQ Cold-Pressed Pellets: Mix 17.9 parts by mass of Xiaoyangdi powder, 6.0 parts by mass of Ultra Special powder, and 9.0 parts by mass of King powder to obtain limonite; mix 4.0 parts by mass of limestone powder, 4.3 parts by mass of dolomite powder, and 3.2 parts by mass of quicklime to obtain flux; Mix CDQ powder, limonite, sinter return fines, and flux in a mass ratio of 1:20:5.5:4 and add water (the added amount of water is 8% of the total mass of the pelletizing mixture) to obtain a pelletizing mixture. Feed the pelletizing mixture into a briquetting machine for pelletizing, and then perform screening to obtain CDQ cold-pressed pellets with an average particle size of about 20 mm.

[0051] Preparation Example 5 Preparation of CDQ Cold-Pressed Pellets: Mix 17.9 parts by mass of Xiaoyangdi powder, 6.0 parts by mass of Ultra Special powder, and 9.0 parts by mass of King powder to obtain limonite; mix 4.0 parts by mass of limestone powder, 4.3 parts by mass of dolomite powder, and 3.2 parts by mass of quicklime to obtain flux; Mix CDQ powder, limonite, sinter return fines, and flux in a mass ratio of 1:20:8:4 and add water (the added amount of water is 8% of the total mass of the pelletizing mixture) to obtain a pelletizing mixture. Feed the pelletizing mixture into a briquetting machine for pelletizing, and then perform screening to obtain CDQ cold-pressed pellets with an average particle size of about 20 mm.

[0052] Preparation Example 6 Preparation of CDQ Cold-Pressed Pellets: Mix 17.9 parts by mass of Xiaoyangdi powder, 6.0 parts by mass of Ultra Special powder, and 9.0 parts by mass of King powder to obtain limonite; mix 4.0 parts by mass of limestone powder, 4.3 parts by mass of dolomite powder, and 3.2 parts by mass of quicklime to obtain flux; Mix CDQ powder, limonite, sinter return fines, and flux in a mass ratio of 1:25:10:5.5 and add water (the added amount of water is 8% of the total mass of the pelletizing mixture) to obtain a pelletizing mixture. Feed the pelletizing mixture into a briquetting machine for pelletizing, and then perform screening to obtain CDQ cold-pressed pellets with an average particle size of about 22 mm.

[0053] Preparation Example 7 Preparation of CDQ Cold-Pressed Pellets: Mix 17.9 parts by mass of Xiaoyangdi powder, 6.0 parts by mass of Chaote powder, and 9.0 parts by mass of King powder to obtain limonite; mix 4.0 parts by mass of limestone powder, 4.3 parts by mass of dolomite powder, and 3.2 parts by mass of quicklime to obtain a flux. Mix CDQ powder, limonite, sinter return fines, and flux in a mass ratio of 1:20:5.5:4 and add water (the addition amount of water is 6% of the total mass of the pelletizing mixture) to obtain a pelletizing mixture. Feed the pelletizing mixture into a briquetting machine for pelletizing treatment, and then perform screening to obtain CDQ cold-pressed pellets with an average particle size of about 20 mm.

[0054] Preparation Example 8 Preparation of CDQ Cold-Pressed Pellets: Mix 17.9 parts by mass of Xiaoyangdi powder, 6.0 parts by mass of Chaote powder, and 9.0 parts by mass of King powder to obtain limonite; mix 4.0 parts by mass of limestone powder, 4.3 parts by mass of dolomite powder, and 3.2 parts by mass of quicklime to obtain a flux. Mix CDQ powder, limonite, sinter return fines, and flux in a mass ratio of 1:20:5.5:4 and add water (the addition amount of water is 4% of the total mass of the pelletizing mixture) to obtain a pelletizing mixture. Feed the pelletizing mixture into a briquetting machine for pelletizing treatment, and then perform screening to obtain CDQ cold-pressed pellets with an average particle size of about 20 mm.

[0055] Preparation Example 9 Preparation of CDQ Cold-Pressed Pellets: Mix 17.9 parts by mass of Xiaoyangdi powder, 6.0 parts by mass of Chaote powder, and 9.0 parts by mass of King powder to obtain limonite; mix 4.0 parts by mass of limestone powder, 4.3 parts by mass of dolomite powder, and 3.2 parts by mass of quicklime to obtain a flux. Mix CDQ powder, limonite, sinter return fines, and flux in a mass ratio of 1:20:5.5:4 and add water (the addition amount of water is 10% of the total mass of the pelletizing mixture) to obtain a pelletizing mixture. Feed the pelletizing mixture into a briquetting machine for pelletizing treatment, and then perform screening to obtain CDQ cold-pressed pellets with an average particle size of about 20 mm.

[0056] Preparation Example 10 Preparation of CDQ Cold-Pressed Pellets: Mix 17.9 parts by mass of Xiaoyangdi powder, 6.0 parts by mass of Chaote powder, and 9.0 parts by mass of King powder to obtain limonite; mix 4.0 parts by mass of limestone powder, 4.3 parts by mass of dolomite powder, and 3.2 parts by mass of quicklime to obtain a flux. Mix CDQ powder, limonite, sinter return fines, and flux in a mass ratio of 1:20:5.5:4 and add water (the added amount of water is 12% of the total mass of the pelletizing mixture) to obtain a pelletizing mixture. Feed the pelletizing mixture into a briquetting machine for pelletizing, and then perform screening to obtain CDQ cold-pressed pellets with an average particle size of about 20 mm.

[0057] Preparation Example 11 Preparation of CDQ Cold-Pressed Pellets: Mix 17.9 parts by mass of Xiaoyangdi powder, 6.0 parts by mass of Ultra Special powder, and 9.0 parts by mass of King powder to obtain limonite; mix 4.0 parts by mass of limestone powder, 4.3 parts by mass of dolomite powder, and 3.2 parts by mass of quicklime to obtain flux; Mix CDQ powder, limonite, sinter return fines, and flux in a mass ratio of 1:12:5.5:4 and add water (the added amount of water is 8% of the total mass of the pelletizing mixture) to obtain a pelletizing mixture. Feed the pelletizing mixture into a briquetting machine for pelletizing, and then perform screening to obtain CDQ cold-pressed pellets with an average particle size of about 13 mm.

[0058] Preparation Example 12 Preparation of CDQ Cold-Pressed Pellets: Mix 17.9 parts by mass of Xiaoyangdi powder, 6.0 parts by mass of Ultra Special powder, and 9.0 parts by mass of King powder to obtain limonite; mix 4.0 parts by mass of limestone powder, 4.3 parts by mass of dolomite powder, and 3.2 parts by mass of quicklime to obtain flux; Mix CDQ powder, limonite, sinter return fines, and flux in a mass ratio of 1:28:5.5:4 and add water (the added amount of water is 8% of the total mass of the pelletizing mixture) to obtain a pelletizing mixture. Feed the pelletizing mixture into a briquetting machine for pelletizing, and then perform screening to obtain CDQ cold-pressed pellets with an average particle size of about 25 mm.

[0059] Preparation Example 13 Preparation of CDQ Cold-Pressed Pellets: Mix 17.9 parts by mass of Xiaoyangdi powder, 6.0 parts by mass of Ultra Special powder, and 9.0 parts by mass of King powder to obtain limonite; mix 4.0 parts by mass of limestone powder, 4.3 parts by mass of dolomite powder, and 3.2 parts by mass of quicklime to obtain flux; Mix CDQ powder, limonite, sinter return fines, and flux in a mass ratio of 1:20:4:4 and add water (the added amount of water is 8% of the total mass of the pelletizing mixture) to obtain a pelletizing mixture. Feed the pelletizing mixture into a briquetting machine for pelletizing, and then perform screening to obtain CDQ cold-pressed pellets with an average particle size of about 20 mm.

[0060] Preparation Example 14 Preparation of CDQ Cold-Pressed Pellets: Mix 17.9 parts by mass of Xiaoyangdi powder, 6.0 parts by mass of Ultra Special powder, and 9.0 parts by mass of King powder to obtain limonite; mix 4.0 parts by mass of limestone powder, 4.3 parts by mass of dolomite powder, and 3.2 parts by mass of quicklime to obtain flux; Mix CDQ powder, limonite, sinter return fines, and flux in a mass ratio of 1:20:12:4 and add water (the addition amount of water is 8% of the total mass of the pelletizing mixture) to obtain a pelletizing mixture. Feed the pelletizing mixture into a pellet press for pelletizing, and then perform screening to obtain CDQ cold-pressed pellets with an average particle size of about 20 mm.

[0061] Preparation Example 15 Preparation of CDQ Cold-Pressed Pellets: Mix 17.9 parts by mass of Xiaoyangdi powder, 6.0 parts by mass of Ultra Special powder, and 9.0 parts by mass of King powder to obtain limonite; mix 4.0 parts by mass of limestone powder, 4.3 parts by mass of dolomite powder, and 3.2 parts by mass of quicklime to obtain flux; Mix CDQ powder, limonite, sinter return fines, and flux in a mass ratio of 1:20:5.5:2 and add water (the addition amount of water is 8% of the total mass of the pelletizing mixture) to obtain a pelletizing mixture. Feed the pelletizing mixture into a pellet press for pelletizing, and then perform screening to obtain CDQ cold-pressed pellets with an average particle size of about 20 mm.

[0062] Preparation Example 16 Preparation of CDQ Cold-Pressed Pellets: Mix 17.9 parts by mass of Xiaoyangdi powder, 6.0 parts by mass of Ultra Special powder, and 9.0 parts by mass of King powder to obtain limonite; mix 4.0 parts by mass of limestone powder, 4.3 parts by mass of dolomite powder, and 3.2 parts by mass of quicklime to obtain flux; Mix CDQ powder, limonite, sinter return fines, and flux in a mass ratio of 1:20:5.5:6 and add water (the addition amount of water is 8% of the total mass of the pelletizing mixture) to obtain a pelletizing mixture. Feed the pelletizing mixture into a pellet press for pelletizing, and then perform screening to obtain CDQ cold-pressed pellets with an average particle size of about 20 mm.

[0063] After testing, the properties of the CDQ cold-pressed pellets prepared in Preparation Examples 1 - 16 are shown in Table 1 below: Table 1: Comparison Table of the Properties of Each CDQ Cold-Pressed Pellet

[0064] As can be seen from Table 1, the prepared CDQ cold-pressed pellets have high drop strength and compressive strength (especially the CDQ cold-pressed pellets prepared in Preparation Examples 2-5), which can ensure that the CDQ cold-pressed pellets will not be broken during the feeding process, reducing material pulverization and its impact on the permeability of the material layer.

[0065] Application Example 1 Based on the conventional coal powder dosage of 3.8 parts by mass, aiming to replace 30% of the conventional coal powder dosage with CDQ powder for sintering heat supply, the calculated dosage of CDQ powder should be 1.41 parts by mass. The system described in Example 4 was used for coupled sintering: CDQ cold-pressed pellets were prepared through the CDQ cold-pressed pellet production unit: 1.41 parts by mass of CDQ powder, 15.6 parts by mass of Xiao Yangdi powder, 5.6 parts by mass of Ultra Special powder, 7.0 parts by mass of King powder, 7.76 parts by mass of sintering return fines, 2.01 parts by mass of limestone powder, 2.12 parts by mass of dolomite powder, and 1.51 parts by mass of quicklime were fed into the first mixer 2 for mixing and water was added (the addition amount of water was 8% of the total mass of the pelletizing mixture). The pelletizing mixture was fed into the pellet press 3 for pelletizing treatment, and then screened through the screening machine 4 to obtain CDQ cold-pressed pellets with an average particle size of about 15 mm.

[0066] The granulated mixture production unit prepared the granulated mixture: 2.66 parts by mass of coal powder, 11.9 parts by mass of Kafun powder, 8.4 parts by mass of A powder, 6.6 parts by mass of Jia powder, 2.3 parts by mass of Xiao Yangdi powder, 0.4 parts by mass of Ultra Special powder, 2.0 parts by mass of King powder, 17.24 parts by mass of sintering return fines, 1.99 parts by mass of limestone powder, 2.18 parts by mass of dolomite powder, and 1.69 parts by mass of quicklime were mixed evenly in the second mixer 8 and water was added (the addition amount of water was 6.5% of the total mass of this part of raw materials and water), and then fed into the granulator for granulation treatment to obtain granulated mixture with an average particle size of about 20 mm.

[0067] The above-prepared CDQ cold-pressed pellets and granulated mixture were laid on the sintering trolley through the nine-roll feeder for ignition sintering, and sintered ore was obtained after sintering.

[0068] Application Example 2 Based on the conventional coal powder dosage of 3.8 parts by mass, aiming to replace 20% of the conventional coal powder dosage with CDQ powder for sintering heat supply, the calculated dosage of CDQ powder should be 0.94 parts by mass. The system described in Example 4 was used for coupled sintering: Preparing CDQ cold-pressed pellets through the CDQ cold-pressed pellet production unit: 0.94 parts by mass of CDQ powder, 10.4 parts by mass of Xiaoyangdi powder, 3.7 parts by mass of Ultra Special powder, 4.7 parts by mass of King powder, 5.17 parts by mass of sinter return, 1.32 parts by mass of limestone powder, 1.42 parts by mass of dolomite powder, and 1.02 parts by mass of quicklime are fed into the first mixer 2 for mixing and water is added (the addition amount of water is 8% of the total mass of the pelletizing mixture) to obtain the pelletizing mixture. The pelletizing mixture is fed into the pellet press 3 for pelletizing treatment, and then screened by the screening machine 4 to obtain CDQ cold-pressed pellets with an average particle size of about 15 mm.

[0069] Preparing the pelletizing mixture through the pelletizing mixture production unit: 3.04 parts by mass of coal powder, 11.9 parts by mass of Carajas powder, 8.4 parts by mass of A powder, 6.6 parts by mass of Jia powder, 7.5 parts by mass of Xiaoyangdi powder, 2.3 parts by mass of Ultra Special powder, 4.3 parts by mass of King powder, 19.83 parts by mass of sinter return, 2.68 parts by mass of limestone powder, 2.88 parts by mass of dolomite powder, and 2.18 parts by mass of quicklime are uniformly mixed in the second mixer 8 and water is added (the addition amount of water is 6.5% of the total mass of this part of raw materials and water), and then fed into the pelletizer for pelletizing treatment to obtain a pelletizing mixture with an average particle size of about 20 mm.

[0070] The above-prepared CDQ cold-pressed pellets and the pelletizing mixture are laid on the sintering trolley through a nine-roll distributor for ignition sintering, and sintered ore is obtained after sintering.

[0071] Application Example 3 Based on the conventional coal powder dosage of 3.8 parts by mass, with the goal of replacing 10% of the conventional coal powder dosage with CDQ powder for sintering heat supply, the calculated dosage of CDQ powder should be 0.47 parts by mass. The system described in Example 4 is used for coupled sintering: Preparing CDQ cold-pressed pellets through the CDQ cold-pressed pellet production unit: 0.47 parts by mass of CDQ powder, 5.2 parts by mass of Xiaoyangdi powder, 1.9 parts by mass of Ultra Special powder, 2.3 parts by mass of King powder, 2.59 parts by mass of sinter return, 0.7 parts by mass of limestone powder, 0.7 parts by mass of dolomite powder, and 0.5 parts by mass of quicklime are fed into the first mixer 2 for mixing and water is added (the addition amount of water is 8% of the total mass of the pelletizing mixture) to obtain the pelletizing mixture. The pelletizing mixture is fed into the pellet press 3 for pelletizing treatment, and then screened by the screening machine 4 to obtain CDQ cold-pressed pellets with an average particle size of about 15 mm.

[0072] The pelletized mixture production unit prepares the pelletized mixture: 3.42 parts by mass of pulverized coal, 11.9 parts by mass of Carajás ore fines, 8.4 parts by mass of Apolo ore fines, 6.6 parts by mass of Jiapeng ore fines, 12.7 parts by mass of Xiaoyangdi ore fines, 4.1 parts by mass of Super Special ore fines, 6.7 parts by mass of King ore fines, 22.41 parts by mass of sinter return fines, 3.3 parts by mass of limestone powder, 3.6 parts by mass of dolomite powder, and 2.7 parts by mass of quicklime are mixed evenly in the second mixer 8, water is added (the addition amount of water is 6.5% of the total mass of this part of raw materials and water), and then it is sent into the pelletizer for pelletizing treatment to obtain a pelletized mixture with an average particle size of about 20 mm.

[0073] The above-prepared CDQ cold-pressed pellets and the pelletized mixture are laid on the sintering trolley through a nine-roll distributor for ignition sintering, and sintered ore is obtained after sintering.

[0074] Application Example 4 Based on the conventional consumption of pulverized coal being 3.8 parts by mass, aiming to replace 5% of the conventional consumption of pulverized coal with CDQ powder for sintering heat supply, the consumption of CDQ powder should be 0.24 parts by mass. The coupled sintering is carried out using the system described in Example 4: The CDQ cold-pressed pellet production unit prepares CDQ cold-pressed pellets: 0.24 parts by mass of CDQ powder, 2.6 parts by mass of Xiaoyangdi ore fines, 0.98 parts by mass of Super Special ore fines, 1.22 parts by mass of King ore fines, 1.32 parts by mass of sinter return fines, 0.35 parts by mass of limestone powder, 0.35 parts by mass of dolomite powder, and 0.26 parts by mass of quicklime are sent into the first mixer 2 for mixing and water is added (the addition amount of water is 8% of the total mass of the pelletizing mixture), and the pelletizing mixture is sent into the briquetting machine 3 for pelletizing treatment, and then it is screened by a screening machine 4 to obtain CDQ cold-pressed pellets with an average particle size of about 15 mm.

[0075] The pelletized mixture production unit prepares the pelletized mixture: 3.42 parts by mass of pulverized coal, 11.9 parts by mass of Carajás ore fines, 8.4 parts by mass of Apolo ore fines, 6.6 parts by mass of Jiapeng ore fines, 15.3 parts by mass of Xiaoyangdi ore fines, 5.02 parts by mass of Super Special ore fines, 7.78 parts by mass of King ore fines, 23.68 parts by mass of sinter return fines, 3.65 parts by mass of limestone powder, 3.95 parts by mass of dolomite powder, and 2.94 parts by mass of quicklime are mixed evenly in the second mixer 8, water is added (the addition amount of water is 6.5% of the total mass of this part of raw materials and water), and then it is sent into the pelletizer for pelletizing treatment to obtain a pelletized mixture with an average particle size of about 20 mm.

[0076] The above-prepared CDQ cold-pressed pellets and the pelletized mixture are laid on the sintering trolley through a nine-roll distributor for ignition sintering, and sintered ore is obtained after sintering.

[0077] Comparative Example 1 Preparation of granulated mixture: 3.8 parts by mass of pulverized coal, 11.9 parts by mass of KD powder, 8.4 parts by mass of AF powder, 6.6 parts by mass of JF powder, 17.9 parts by mass of XYDD powder, 6.0 parts by mass of CT powder, 9.0 parts by mass of GW powder, 25.0 parts by mass of sinter return fines, 4.0 parts by mass of limestone powder, 4.3 parts by mass of dolomite powder, and 3.2 parts by mass of quicklime were mixed evenly in the second mixer 8 and water (the addition amount of water was 6.5% of the total mass of this part of raw materials and water) was added, and then sent into a granulator for granulation treatment to obtain a granulated mixture with an average particle size of about 20 mm.

[0078] The above-prepared granulated mixture was laid on a sintering trolley through a nine-roll distributor for ignition sintering, and sintered ore was obtained after sintering.

[0079] The properties and energy consumption of the sintered ore prepared in Comparative Example 1 and Application Examples 1-4 were detected, and the results are shown in Table 2 below: Table 2: Comparison table of sintered ore properties and energy consumption

[0080] Note: The current price of pulverized coal is about 1151.00 yuan / ton, and the current price of CDQ powder is about 703.91 yuan / ton.

[0081] As can be seen from Table 2, for the sintered ore prepared in Application Examples 1-4, its drum strength exceeded 70%, reaching the standard of high-quality sintered ore, and the sintering utilization coefficient reached 1.75 t·m 2 ·h -1 The above, with high production efficiency. Compared with Comparative Example 1, the yield increased slightly, the sintered solid fuel consumption decreased, and the fuel cost decreased significantly compared with the comparative example. Especially in Application Examples 1-3, the CDQ powder usage was large, the yield was high, and the sintered solid fuel consumption and fuel cost were both low. It can be seen that in Application Examples 1-3, while fully recycling and utilizing CDQ powder, it did not affect the yield of sintered ore, and significantly reduced the production cost. It has the advantages of good quality, low cost, simple process, economy and environmental protection of sintered ore products. In the present invention, the sources of some raw materials used are as follows: CDQ powder was purchased from the sintering plant of Wuhan Iron and Steel Company, XYDD powder, JF powder, and AF powder were produced by BHP Billiton in Australia, CT powder and GW powder were produced by FMG in Australia, KD powder was produced by Vale in Brazil, all of which are purchasable products circulating in the iron ore market. Limestone powder, dolomite powder and quicklime came from the sintering plant of Hunan Valin Xiangtan Iron and Steel Co., Ltd.

Claims

1. A CDQ cold-pressed pellet, characterized in that: The CDQ cold-pressed pellets are prepared by the following method: First, mix CDQ powder, limonite, sinter return fines, and fluxes, then add water and mix evenly, and finally press to obtain CDQ cold-pressed pellets.

2. The CDQ cold-pressed pellets according to claim 1, characterized in that: The mixing mass ratio of the CDQ powder, limonite, sinter return fines, and fluxes is 1:15 - 25:5 - 10:2.5 - 5.5, preferably 1:16 - 22:5.5 - 8:3 - 5.

3. The CDQ cold-pressed pellets according to claim 1 or 2, characterized in that: The particle size of the CDQ cold-pressed pellets is 10 - 30 mm, the water content is 6 - 10 wt%, the drop strength is 4 - 8 times / 0.5 m, and the compressive strength is 50 - 150 N / piece.

4. The CDQ cold-pressed pellet according to any one of claims 1-3, characterized in that: The limonite includes one or more of Xiaoyangdi powder, Ultra Special powder, and King powder or is composed of one or more of Xiaoyangdi powder, Ultra Special powder, and King powder; and / or The fluxes include one or more of limestone, dolomite, and quicklime or are composed of one or more of limestone, dolomite, and quicklime.

5. A sintering method based on CDQ cold-pressed pellets, characterized in that: This method includes the following steps: 1) First, weigh fuel, iron ore blended material, sinter return fines, and fluxes according to the composition of the CDQ cold-pressed pellets described in any one of claims 1 - 4 for batching to obtain a mixed material, and then add water to the mixed material and granulate to obtain a granulated mixed material; 2) Mix and distribute the granulated mixed material and the CDQ cold-pressed pellets described in any one of claims 1 - 4 and sinter them. After sintering, sintered ore is obtained.

6. The sintering method according to claim 5, wherein: In step 1), in the CDQ cold-pressed pellets and the granulated mixed material, the total usage mass ratio of fuel, iron ore blended material, sinter return fines, and fluxes is 0.6 - 0.9:14 - 16:5 - 7:2 - 4, preferably 0.7 - 0.8:14 - 16:5 - 7:2 - 4; and / or In step 2), the input amount of the CDQ cold-pressed pellets is such that the heat carried by the CDQ cold-pressed pellets is 10 - 40% of the total heat carried by the granulated mixed material and the CDQ cold-pressed pellets, preferably 20 - 30%.

7. The sintering method according to claim 5 or 6, characterized in that: In step 1), the fuel includes one or more of pulverized coal, coke powder, and semi-coke powder or is composed of one or more of pulverized coal, coke powder, and semi-coke powder; and / or In step 1), the iron ore blended material includes one or more of hematite powder, magnetite powder, and limonite powder or is composed of one or more of hematite powder, magnetite powder, and limonite powder; and / or In step 1), the fluxes include one or more of limestone, dolomite, and quicklime or are composed of one or more of limestone, dolomite, and quicklime.

8. The sintering method according to any one of claims 5 - 7, characterized in that: In step 1), the particle size of the granulated mixed material is 8 - 20 mm, and the water content is 5 - 8 wt%.

9. A sintering system based on CDQ cold-pressed pellets, characterized in that: The sintering system includes a CDQ cold-pressed pellet production unit, a granulated mixture production unit, and a sintering unit; the CDQ cold-pressed pellet production unit includes a pellet batching mechanism (1), a first mixer (2), a pellet press (3), a screening machine (4), and a cold-pressed pellet conveying device (5) connected in series in sequence; the granulated mixture production unit includes a granulation batching mechanism (7), a second mixer (8), a granulator (9), and a granulated mixture conveying device (10) connected in series in sequence; the sintering unit includes a feeding machine (11) and a sintering machine (12) connected in series in sequence; the discharge ends of the cold-pressed pellet conveying device (5) and the granulated mixture conveying device (10) are both connected to the feeding end of the feeding machine (11). Preferably, the coarse material outlet of the screening machine (4) is connected to the feeding end of the cold-pressed pellet conveying device (5), and the fine material outlet of the screening machine (4) is connected to the feeding end of the first mixer (2) through a fine material return device (6).

10. The sintering system according to claim 9, characterized in that: The pellet batching mechanism (1) includes a CDQ powder bin (101), a limonite bin (102), a first return ore bin (103), a first flux bin (104), and a first raw material conveying device (105); the CDQ powder bin (101), the limonite bin (102), the first return ore bin (103), and the first flux bin (104) are arranged in parallel, and the CDQ powder bin (101), the limonite bin (102), the first return ore bin (103), and the first flux bin (104) are all connected to the feeding end of the first raw material conveying device (105) through independent first feeders (106), and the discharge end of the first raw material conveying device (105) is connected to the feeding end of the first mixer (2); and / or The granulation batching mechanism (7) includes a solid fuel bin (701), an iron ore homogenized bin (702), a second return ore bin (703), a second flux bin (704), and a second raw material conveying device (705); the solid fuel bin (701), the iron ore homogenized bin (702), the second return ore bin (703), the second flux bin (704), and the second raw material conveying device (705) are arranged in parallel, and the solid fuel bin (701), the iron ore homogenized bin (702), the second return ore bin (703), the second flux bin (704), and the second raw material conveying device (705) are all connected to the feeding end of the second raw material conveying device (705) through independent second feeders (706), and the discharge end of the second raw material conveying device (705) is connected to the feeding end of the second mixer (8).

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