CN112126780A - Low-temperature and rapid preparation method and system of iron ore oxidized pellets - Google Patents
Low-temperature and rapid preparation method and system of iron ore oxidized pellets Download PDFInfo
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Abstract
A low-temperature and rapid preparation method and a system for iron ore oxidized pellets comprise the following steps: 1) preparing a 3D printing mixture: uniformly mixing raw materials to obtain a 3D printing mixture, wherein the raw materials comprise: iron ore concentrate, a binder, titanium dioxide, vanadium pentoxide and fibers; 2) preparing pellet: preparing the 3D printing mixture into green pellets by adopting a 3D printing technology; 3) performing pretreatment: performing pre-drying treatment on the green pellets to obtain dry green pellets; 4) oxidizing and roasting treatment: and carrying out oxidation roasting treatment on the dried green pellets to obtain finished pellets. The technical scheme provided by the application can effectively reduce the powder generation amount of the pellet in the grate-kiln system, prevent the ring formation phenomenon and reduce the times of shutdown maintenance; improves the ventilation and heat uniformity of the pellets, and reduces the temperature and time for pellet roasting, thereby reducing the energy consumption in the process of grate-rotary kiln technology and further reducing the production cost of enterprises.
Description
Technical Field
The invention relates to a preparation method of oxidized pellets, in particular to a low-temperature and rapid preparation method of iron ore oxidized pellets, belonging to the technical field of mineral aggregate pellets; the invention also relates to a low-temperature and rapid preparation system of the iron ore oxidized pellets.
Background
The consumption of steel serving as an irreplaceable structural and functional material in an industrialization process occupies more than 95% of the total metal consumption for a long time, pellet preparation is one of the primary processes for producing steel, the pellet yield in 2018 of China reaches about 1.4 hundred million tons, and the pellet preparation plays an important role in national economy. The scale effect of most of the pelletizing plants is remarkable, for example, the annual output of pellets in Zhanjiang steel plant, Baotou steel plant and Jingtang steel plant in 2018 is 443, 406 and 354 ten thousand tons respectively. However, due to the defects of uneven particle size, poor strength, more powder and the like in the pellet preparation process, the problems of ring formation, poor strength of finished pellets and the like are easy to occur in the subsequent rotary kiln roasting, so that the production is not smooth and the products are not qualified. The 3D printing technology adopts a fine computer control program, so that the uniformity and the accuracy of the pelletizing procedure can be realized; meanwhile, the extrusion force in the 3D forming process is greater than the acting stress of the pelletizing disc, so that the green pellet strength can be further improved, and the pellet production stability is improved. Therefore, there is a need to develop a preparation method of iron ore oxidized pellets based on 3D printing, which can reduce the production cost and improve the product quality.
The iron pre-process in China is mainly sintering, and accounts for about 70%; the pellet is used as auxiliary material, and is less than 30%. The prior process of foreign iron is mainly pellet, and the pellet proportion of part of the country is even up to 100%. The product prepared by the pelletizing procedure has high iron grade, good metallurgical performance and lower environmental pollution degree than the sintering procedure. At present, the main flow of the pelletizing procedure is a grate-rotary kiln process, which does not occupy an advantage position in China because the process has the following main problems: (1) the pellets cannot be effectively consolidated in the process of a chain grate machine, the wear resistance is insufficient, powder is easily generated in the rotary kiln due to continuous motion friction, so that ring formation accidents are frequent, the production stability is poor, and the operation difficulty is high; (2) the reaction temperature is high and the reaction time is long. The reaction temperature of the iron ore grate-rotary kiln for preparing the oxidized pellets is generally 1250-1350 ℃, the reaction time is generally 15-50 min, and the pellets are placed in the rotary kiln for a long time in a high-temperature environment, so that a large amount of energy is consumed, the risk of material ring formation is greatly increased, the production stability is influenced, and the industrial popularization of the grate-rotary kiln iron ore pellet technology is limited.
Therefore, how to provide a low-temperature and rapid preparation method of iron ore oxidized pellets, which can effectively reduce the powder generation amount of the pellets in a grate-rotary kiln system, prevent the ring formation phenomenon and reduce the times of shutdown maintenance; the technical problems to be solved by the technical personnel in the field are that the ventilation and heat uniformity of the pellets are improved, and the temperature and time for roasting the pellets are reduced, so that the energy consumption in the process of a chain grate machine-rotary kiln is reduced, and the production cost of enterprises is further reduced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to effectively reduce the powder generation amount of pellet ore in a chain grate-rotary kiln system by using a 3D printing technology, prevent the ring formation phenomenon and reduce the times of shutdown maintenance; the ventilation and heat uniformity of the pellets are improved, and the temperature and time for pellet roasting are reduced, so that the energy consumption in the process of a chain grate machine-rotary kiln is reduced, and the production cost of enterprises is further reduced. The invention provides a low-temperature and rapid preparation method of iron ore oxidized pellets, which comprises the following steps: 1) preparing a 3D printing mixture: uniformly mixing raw materials to obtain a 3D printing mixture, wherein the raw materials comprise: iron ore concentrate, a binder, titanium dioxide, vanadium pentoxide and fibers; 2) preparing pellet: preparing the 3D printing mixture into green pellets by adopting a 3D printing technology; 3) performing pretreatment: performing pre-drying treatment on the green pellets to obtain dry green pellets; 4) oxidizing and roasting treatment: and carrying out oxidation roasting treatment on the dried green pellets to obtain finished pellets.
According to a first embodiment of the present invention, there is provided a low-temperature and rapid preparation method of iron ore oxidized pellets:
a low-temperature and rapid preparation method of iron ore oxidized pellets comprises the following steps: 1) preparing a 3D printing mixture: uniformly mixing raw materials to obtain a 3D printing mixture, wherein the raw materials comprise: iron ore concentrate, a binder, titanium dioxide, vanadium pentoxide and fibers; 2) preparing pellet: preparing the 3D printing mixture into green pellets by adopting a 3D printing technology; 3) performing pretreatment: performing pre-drying treatment on the green pellets to obtain dry green pellets; 4) oxidizing and roasting treatment: and carrying out oxidation roasting treatment on the dried green pellets to obtain finished pellets.
Preferably, the 3D printing mix comprises:
iron ore concentrate: 70-150 parts by weight, preferably 80-140 parts by weight, more preferably 90-120 parts by weight;
adhesive: 0.1 to 10 parts by weight, preferably 0.3 to 8 parts by weight, more preferably 0.5 to 5 parts by weight;
titanium dioxide: 0.01 to 3 parts by weight, preferably 0.03 to 2 parts by weight, more preferably 0.05 to 1 part by weight;
vanadium pentoxide: 0.01 to 3 parts by weight, preferably 0.03 to 2 parts by weight, more preferably 0.05 to 1 part by weight;
fiber: 0.01 to 3 parts by weight, preferably 0.03 to 2 parts by weight, more preferably 0.05 to 1 part by weight;
water: 1 to 40 parts by weight, preferably 2 to 30 parts by weight, more preferably 3 to 20 parts by weight.
Preferably, the green pellets are honeycomb green pellets; the honeycomb green pellet ore is provided with a through hole communicated with the inside.
Preferably, in the step 3), the temperature of the prefabrication drying treatment is 90-150 ℃, preferably 100-120 ℃, and more preferably 104-108 ℃; the time of the prefabricating and drying treatment is 1-6 hours; preferably 2-4 hours.
Preferably, the oxidizing roasting treatment in step 4) includes the steps of:
4a) firstly, preheating dry green pellets, wherein the preheating temperature is 400-800 ℃, and preferably 500-800 ℃; preheating for 5-40 min; preferably 10-30 min; after the preheating treatment is finished, the next roasting treatment is carried out;
4b) the temperature of the roasting treatment is 800-1400 ℃; preferably 800-1100 ℃; the roasting time is 5-40 min; preferably 10-20 min;
4c) and (4) cooling the roasted pellets, and taking out the pellets from the roasting device when the temperature of the pellets is reduced to 500 ℃ to obtain finished pellets.
Preferably, the iron ore concentrate is one or more of hematite, magnetite and specularite; the iron concentrate is preferably hematite and/or magnetite; the total iron grade TFe of the iron ore concentrate is more than or equal to 60 percent, preferably more than or equal to 63 percent, and more preferably more than or equal to 66 percent; the particle size of the iron ore concentrate is 0-0.5 mm, preferably 0.01-0.2mm, and more preferably 0.05-0.1 mm; the water content of the iron concentrate is less than 10%, preferably less than 8%, more preferably less than 6%.
Preferably, the fibers are polyethylene fibers and/or polyurethane fibers, and preferably the polyethylene fibers are high modulus polyethylene fibers; the polyurethane fiber is polyether type and/or polyester type elastic fiber.
Preferably, the polyethylene fibers have a length of 0.1 to 100mm, preferably 0.5 to 80mm, more preferably 1 to 50 mm; the elastic modulus of the polyethylene fiber is 50-200N/tex, preferably 80-180N/tex, more preferably 100-150N/tex; and/or
The elastic elongation of the polyurethane fiber is 400-700%, preferably 450-650%, more preferably 500-600%; the elastic recovery rate of the polyurethane fiber is more than or equal to 90 percent, preferably more than or equal to 95 percent, and more preferably more than or equal to 98 percent; the breaking strength of the polyurethane fibers is 1 to 30cN/dtex, preferably 3 to 25cN/dtex, more preferably 5 to 20 cN/dtex.
Preferably, the binder is one or more of bentonite, water glass, slaked lime, sodium humate and organic composite binder.
Preferably, the particle size of the binder is 0 to 0.3mm, preferably 0.01 to 0.2mm, more preferably 0.03 to 0.1 mm.
According to a second embodiment of the present invention, there is provided a low-temperature and rapid iron ore oxidized pellet manufacturing system:
a low-temperature and rapid iron ore oxidized pellet manufacturing system applying the low-temperature and rapid iron ore oxidized pellet manufacturing method according to the first embodiment, the system comprising: the device comprises a mixing device, a pellet 3D printing device, a drying device and a roasting device; the discharge hole of the mixing device is communicated with the feed hole of the pellet 3D printing device; the discharge hole of the pellet 3D printing device is communicated with the feed hole of the drying device; and the discharge hole of the drying device is communicated with the feed inlet of the roasting device.
Preferably, the pellet 3D printing device is a 3D printing apparatus using powdered metal as a raw material; the 3D printing equipment is made into honeycomb-shaped pellets through an additive technology.
In a first embodiment of the application, a low-temperature and rapid preparation method of iron ore oxidized pellets is provided, which fully utilizes the characteristics of 3D printing technology for printing and manufacturing products, and the products obtained by the 3D printing technology have high compressive strength and dropping strength and relatively high thermal stability. The green pellets obtained by the 3D printing technology are placed in a chain grate machine-rotary kiln, so that the powder is reduced and the ring formation is prevented while the green pellets have extremely high air permeability and uniform heat property. In the process, raw materials are mixed, wherein the raw materials comprise 3D printing additives of titanium dioxide and vanadium pentoxide, the mixed 3D printing mixture is made into green pellets through 3D printing equipment, then the green pellets are dried, finally the dried green pellets are subjected to oxidation roasting treatment, and finally finished pellets are obtained. The technical scheme provided by the application can effectively reduce the powder generation amount of the pellet in the grate-kiln system, prevent the ring formation phenomenon and reduce the times of shutdown maintenance; improves the ventilation and heat uniformity of the pellets, and reduces the temperature and time for pellet roasting, thereby reducing the energy consumption in the process of grate-rotary kiln technology and further reducing the production cost of enterprises.
It should be noted that titanium dioxide and vanadium pentoxide belong to the 3D printing additives.
In the first embodiment of the present application, in order to apply the 3D printing technology to the technical field of mineral aggregate pellets, a certain study on the ratio of raw materials is needed first. This application prints the mixture through the 3D who obtains iron ore concentrate and binder, titanium dioxide, vanadic anhydride, fibre intermixing, and this mixture can make full use of titanium dioxide have high cohesive ability's characteristic, combines together it with traditional mineral aggregate binder, can play the effect that improves pellet high temperature stability.
It should be noted that the water content of the iron ore powder is controlled (the water content of the iron ore powder is less than or equal to 10%, preferably the water content of the iron ore powder is less than or equal to 8%, and more preferably the water content of the iron ore powder is less than or equal to 6%). Meanwhile, the binder, the titanium dioxide, the vanadium pentoxide, the fibers and the like are controlled to be in a completely dry state, and the purpose and the effect are as follows: because the main function of the first mixer of pellet is the mixture, in order to satisfy the requirement of 3D printing, the additive is more, and its requirement to the mixing process is higher, and the material is through the incessant rotation of mixer under the low moisture state, and the mixing effect is better.
The nano-scale titanium dioxide is adopted because the titanium dioxide has super-hydrophilic surface and strong adhesive force, so that the overall adhesive force of the pellet mixture can be increased, the tensile strength of materials is improved, the elongation at break is reduced, and the pellet mixture can better become a qualified 3D printing raw material.
It should be noted that the micron-sized vanadium pentoxide is adopted because the vanadium pentoxide can react with calcium and magnesium elements and water in the pellet mixture to form a stable colloidal solution, so that the overall adhesive force of the pellet mixture is increased, and the requirement of the 3D printing raw material is better met.
It should be noted that the fiber is a substance composed of continuous or discontinuous filaments, plays an important role in the aspects of maintaining and binding materials, and the addition of the fiber can effectively improve the strength, rigidity and elasticity of the pellet mixture. Meanwhile, the fiber can act with the binder to form a good bonding interface in the pellet mixture, so that the bonding strength of the pellet mixture is improved, and the requirement of 3D printing raw materials is met.
In the first embodiment of the present application, green pellets obtained by 3D printing have through holes that are communicated with the inside, thereby allowing better heat conduction from the outside high temperature into the inside of the pellets; the honeycomb pellet obtained by adopting the 3D printing technology can reduce the temperature and time in the roasting process, and reduce the roasting energy consumption under the condition of meeting the same product quality.
In the first embodiment of the present application, the honeycomb pellets obtained by 3D printing can also reduce the temperature and time during the pre-drying process, thereby reducing the energy consumption during the drying process.
In the first embodiment of the application, preheating is firstly needed in the whole oxidizing roasting treatment, and high-temperature roasting is carried out after sufficient preheating, so that the interior of the pellet ore can be uniformly heated, and finally the finished pellet ore is obtained after cooling.
It is important to point out that the invention adopts 3D printing technology to prepare the iron-containing raw material into the honeycomb pellet ore, and the technical problems to be solved are as follows: (1) powder is easily generated in the stage of the chain grate machine, and the looping is easily caused. The invention adopts 3D printing technology to prepare the pellet, the extrusion force in the 3D forming process is larger than the acting stress of the pelletizing disc, the compression strength and the falling strength of the green pellet can be effectively improved, the thermal stability of the pellet is enhanced, and the compression strength of the finished pellet is improved. The honeycomb pellet structure molded by the invention is easy to form bridging connection among materials, is beneficial to solid-phase consolidation of the materials in a chain grate machine, can solve the problems of poor wear resistance and easy ring formation in the subsequent high-temperature procedure of the chain grate machine and a rotary kiln, and relieves the problem of unsmooth production; (2) the reaction temperature is high and the reaction time is long. The invention adopts a fine 3D printing computer program control technology, realizes the uniformity and the accuracy of the pelletizing process, molds the traditional compact pellet ore into the honeycomb pellet ore with uniform structure and developed pores, greatly reduces the difficulty of gas-solid contact, can effectively reduce the reaction temperature and time, not only reduces the energy consumption level, but also greatly reduces the ring forming risk of materials in the rotary kiln in the process environment of low temperature and short time. Therefore, the 3D printing technology is combined with the grate-rotary kiln iron ore oxidized pellet process which is not well developed in China, the fine 3D printing computer program control technology is adopted, the prepared honeycomb pellets are high in strength, good in thermal stability and developed in pores, the reaction temperature and time can be effectively reduced, the problem of ring formation of materials in a rotary kiln is solved, and a more stable and efficient way is hopefully developed for the development of the iron ore grate-rotary kiln iron ore oxidized pellet process in China.
The following is a description of the prior grate-rotary kiln pelletizing method
Equipment required by 1 grate-rotary kiln pelletizing method production process
The chain grate-rotary kiln pelletizing method is a method for producing pellets by a combined machine set, and the production process needs a plurality of devices which are auxiliary devices such as a proportioning machine, a wet grinding machine, a drying machine, a pelletizing disc, a green pellet screening and distributing machine, a chain grate machine, a rotary kiln, a circular cooler and the like.
2 use of the additive
As shown in the process flow in fig. 3, when pellets are produced by using a grate-rotary kiln pelletizing method, an additive is added into raw materials, bentonite is a main commonly used additive, and 0.5-4.0% of bentonite is usually added into pelletizing concentrate, so that the pelletizing property of the concentrate can be effectively improved, the green pellet strength can be remarkably improved, and especially the bursting temperature during green pellet drying and the strength of finished pellets can be remarkably improved.
3 drying and using of raw materials
Adding bentonite with a certain proportion into the iron concentrate, and after mixing, putting the mixed material into a dryer for drying. After the materials are dried, the materials can be added into a moistening and grinding machine with forced feeding, the materials can be finely ground in the moistening and grinding machine, the materials are ground to about 200 meshes, more than 80 percent of mineral powder with the required granularity of 0.074mm is needed, and the specific surface area is 1500cm2More than g. The specific surface area of the material can be effectively increased by levigating the material, so that more sufficient contact area is provided for next-step pelletizing, and the pelletizing quality is improved.
4 pelletizing and sieving of the prior art
After the materials are wet-milled in the wet-milling machine, the materials are conveyed into a disc pelletizer through a belt conveyor to begin pelletizing. The requirements of yield and sphere diameter need to be met in the pelletizing process, so that the speed limit of the periphery of the disc needs to be controlled to be 1.0-2.0 m/s, and the inclination angle of the disc needs to be controlled to be 45-50 degrees; in addition, the height of the edge of the disk is 0.1-0.12 times of the height of the edge of the disk; in addition, the filling rate of the disc pelletizer is only about 10-20%. After the green pellets are produced by the disc pelletizer, qualified products need to be screened out, the round pellets are screened by a round roller type screening machine, and then after the qualified green pellets are screened, the green pellets are conveyed into a chain grate machine to be dried and preheated for subsequent application. To the unqualified green ball of screening out, all need transport the crushing roller through the belt feeder and carry out the breakage in, after the breakage is accomplished, transport the material back among the disk pelletizer again, carry out the pelletization again.
The green ball screening aims to ensure the uniform and stable particle size of the green balls entering the chain grate machine, the green balls with uniform and stable particle size can be screened out by screening the green balls, and the green balls with uniform and stable particle size are conveyed into the chain grate machine for drying and preheating. In order to ensure the screening efficiency, the screen roller sticky materials are cleaned regularly, and the cleaning and cleanness of the screen roller are ensured. In addition, the screen roller needs to be replaced, when the screen roller is bent and deformed or the gap error of different parts of the same gap exceeds 5mm due to abrasion, the screen roller needs to be replaced, and the green ball screening efficiency can be ensured.
5 drying and preheating of green pellets
The drying and preheating of the green pellets are carried out in a chain grate machine which is mainly divided into four parts, namely an air draft drying section I, an air draft drying section II, a preheating section I and a preheating section II. The qualified green ball of screening can enter into the chain grate machine from the afterbody of chain grate machine, and it can enter into air draft drying I section at first, and the main effect of this section is that take off the attached moisture in green ball surface, and the temperature of this section need be controlled at 250 ℃, and this is mainly in order to prevent that the high temperature from causing the green ball surface moisture to volatilize too fast, leads to the inside and outside humidity of green ball to be different, and outside dry and inside is moist, and then causes the cracked problem of green ball. The hot air flow in the air draft drying I section is the hot waste gas of the third cooling section of the circular cooler. After the moisture on the surface is removed through the air draft drying section I, the green pellets are conveyed to an air draft drying section II, the temperature of the section is generally controlled to be about 450 ℃, the main function of the section is to dehydrate and dry the green pellets, and the hot air flow of the section is to preheat the waste gas of the section II from a chain grate machine.
The green pellets are then transported to a preheat stage I, where the temperature is typically controlled at 700 ℃, where the green pellets are further dried, primarily oxidized, and consolidated. The hot air flow for preheating the first section comes from the self-preheating second section of the chain grate machine. The green pellets are then transferred to the preheat stage II, which is the stage where the temperature of the grate is highest, typically controlled at 1050 ℃ to 1100 ℃. In the preheating stage II, the green ball can complete the decomposition of internal crystal water at high temperature, can be heated, is partially solidified, hardened and oxidized, can obviously improve the strength of the green ball after the treatment is completed, can bear continuous impact in the rotary kiln, and does not crack. The rupture strength of the green pellets is very important, which is a prerequisite for the green pellets to enter the rotary kiln for roasting, and mainly because if the preheating strength of the green pellets entering the rotary kiln is not enough, the quantity of powder entering the rotary kiln is increased, and further, the problems of production ring formation and the like are caused, and the production is influenced. After the chain grate machine is dried and preheated and has certain strength, green pellets can enter the rotary kiln through a scraper plate of the chain grate machine and a chute at the joint of the tail of the rotary kiln.
6 pellet roasting
When the pellets are dried and preheated by the chain grate, the pellets with certain strength enter the rotary kiln, roll along with the rotary kiln and move from the tail of the rotary kiln to the head of the rotary kiln. A special burner is arranged at the kiln head of the rotary kiln to provide required heat for the rotary kiln. In addition, the cooling waste gas of the first section of the circular cooler is also introduced into a kiln head cover, and the temperature of roasting in the kiln is ensured in such a way. Inside the rotary kiln, the pellets undergo the following reactions:
4Fe3O4+O2＝6Fe2O3
in the grate-kiln pelletizing process, the rotary kiln is usually operated with the following parameters: the inclination angle is usually 3-5%, the filling rate is 7-8%, the rotating speed is usually kept at 0.3-1.5 r/min, and the pellets are usually roasted at 1250-1300 ℃ for 25-40 min.
7 pellet cooling
After the roasting time is reached, the roasted pellets pass through a fixed screen in a kiln head cover, the fixed screen allows pellets with the block size of less than 200mm to pass through, and then the pellets enter a blast type annular cooler for cooling. After entering the cooling machine, the material firstly enters the first cooling section, the temperature of the material is about 1250 ℃, the flat material lump in the hopper can enable the pellets to be uniformly distributed on the trolley of the circular cooler, and then the fan blows natural air from bottom to top into the circular cooler from the air box below the trolley to cool the material. The circular cooler has 4 sections, wherein hot gas in the first section can flow into the kiln and is used as secondary air; the two sections and the three sections can be respectively used as heat sources for preheating the first section and exhausting and drying the first section of the chain grate machine, and the waste gas of the last section can be discharged. The design can effectively improve the utilization rate of the hot air flow of the single-unit equipment, realize the cyclic application of the hot air flow of the multi-stage equipment, effectively improve the utilization efficiency of energy sources and reduce the energy consumption. The pellets are typically cooled in an annular cooler for about 45 minutes, then discharged through a discharge port when the temperature drops below 150 ℃, and transported to a storage location via a belt conveyor for later use.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the technical scheme, the prepared honeycomb pellets are high in strength and not prone to generating powder. The invention adopts 3D printing technology to prepare the pellet, the extrusion force in the 3D forming process is larger than the acting stress of the pelletizing disc, the compression strength and the falling strength of the green pellet can be effectively improved, the thermal stability of the pellet is enhanced, and the compression strength of the finished pellet is improved. The molded honeycomb pellet structure is easy to form bridging connection among materials, is beneficial to solid-phase consolidation of the materials in a chain grate machine, can solve the problems of poor wear resistance and easy ring formation in the subsequent high-temperature procedure of the chain grate machine and a rotary kiln, and relieves the difficulty of unsmooth production;
2. the technical scheme provided by the application can reduce the reaction temperature of the oxidized pellets and shorten the reaction time. The invention adopts a fine 3D printing computer program control technology, realizes the uniformity and the accuracy of the pelletizing process, and molds the traditional compact pellet ore into the honeycomb pellet ore with uniform structure and developed pores. The honeycomb pellet ore has a large number of cracks and pores, the pores and the specific surface area are increased, reaction gas can continuously and deeply enter the material, a gas-solid reaction channel is opened, the gas-solid contact difficulty is reduced, the gas-solid contact is more sufficient, and the product quality is stable and uniform. The chemical reaction strength of the invention is high, the speed is fast, the effect of mass and heat transfer is good, and the energy consumption is low. Compared with the conventional iron ore pelletizing process, the method can reduce the reaction temperature by 200-500 ℃, shorten the reaction time by 10-30min, reduce the energy consumption level, and greatly reduce the risk of ring formation of materials in the rotary kiln due to the low-temperature short-time process environment.
Drawings
Fig. 1 is a flow chart of a low-temperature and rapid iron ore oxidized pellet manufacturing method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram showing a comparison of green pellets obtained by 3D printing (right) and disc pelletizing in accordance with an embodiment of the present invention;
FIG. 3 is a schematic process flow diagram of the prior art;
fig. 4 is a schematic structural view of a low-temperature and rapid iron ore oxidized pellet preparation system according to an embodiment of the present invention.
Reference numerals:
1: a mixing device; 2: a pellet 3D printing device; 3: a drying device; 4: and (5) roasting the device.
Detailed Description
According to a first embodiment of the present invention, there is provided a low-temperature and rapid preparation method of iron ore oxidized pellets:
a low-temperature and rapid preparation method of iron ore oxidized pellets comprises the following steps: 1) preparing a 3D printing mixture: uniformly mixing raw materials to obtain a 3D printing mixture, wherein the raw materials comprise: iron ore concentrate, a binder, titanium dioxide, vanadium pentoxide and fibers; 2) preparing pellet: preparing the 3D printing mixture into green pellets by adopting a 3D printing technology; 3) performing pretreatment: performing pre-drying treatment on the green pellets to obtain dry green pellets; 4) oxidizing and roasting treatment: and carrying out oxidation roasting treatment on the dried green pellets to obtain finished pellets.
Preferably, the 3D printing mix comprises:
iron ore concentrate: 70-150 parts by weight, preferably 80-140 parts by weight, more preferably 90-120 parts by weight;
adhesive: 0.1 to 10 parts by weight, preferably 0.3 to 8 parts by weight, more preferably 0.5 to 5 parts by weight;
titanium dioxide: 0.01 to 3 parts by weight, preferably 0.03 to 2 parts by weight, more preferably 0.05 to 1 part by weight;
vanadium pentoxide: 0.01 to 3 parts by weight, preferably 0.03 to 2 parts by weight, more preferably 0.05 to 1 part by weight;
fiber: 0.01 to 3 parts by weight, preferably 0.03 to 2 parts by weight, more preferably 0.05 to 1 part by weight;
water: 1 to 40 parts by weight, preferably 2 to 30 parts by weight, more preferably 3 to 20 parts by weight.
Preferably, the green pellets are honeycomb green pellets; the honeycomb green pellet ore is provided with a through hole communicated with the inside.
Preferably, in the step 3), the temperature of the prefabrication drying treatment is 90-150 ℃, preferably 100-120 ℃, and more preferably 104-108 ℃; the time of the prefabricating and drying treatment is 1-6 hours; preferably 2-4 hours.
Preferably, the oxidizing roasting treatment in step 4) includes the steps of:
4a) firstly, preheating dry green pellets, wherein the preheating temperature is 400-800 ℃, and preferably 500-800 ℃; preheating for 5-40 min; preferably 10-30 min; after the preheating treatment is finished, the next roasting treatment is carried out;
4b) the temperature of the roasting treatment is 800-1400 ℃; preferably 800-1100 ℃; the roasting time is 5-40 min; preferably 10-20 min;
4c) and (4) cooling the roasted pellets, and taking out the pellets from the roasting device when the temperature of the pellets is reduced to 500 ℃ to obtain finished pellets.
Preferably, the iron ore concentrate is one or more of hematite, magnetite and specularite; the iron concentrate is preferably hematite and/or magnetite; the total iron grade TFe of the iron ore concentrate is more than or equal to 60 percent, preferably more than or equal to 63 percent, and more preferably more than or equal to 66 percent; the particle size of the iron ore concentrate is 0-0.5 mm, preferably 0.01-0.2mm, and more preferably 0.05-0.1 mm; the water content of the iron concentrate is less than 10%, preferably less than 8%, more preferably less than 6%.
Preferably, the fibers are polyethylene fibers and/or polyurethane fibers, and preferably the polyethylene fibers are high modulus polyethylene fibers; the polyurethane fiber is polyether type and/or polyester type elastic fiber.
Preferably, the polyethylene fibers have a length of 0.1 to 100mm, preferably 0.5 to 80mm, more preferably 1 to 50 mm; the elastic modulus of the polyethylene fiber is 50-200N/tex, preferably 80-180N/tex, more preferably 100-150N/tex; and/or
The elastic elongation of the polyurethane fiber is 400-700%, preferably 450-650%, more preferably 500-600%; the elastic recovery rate of the polyurethane fiber is more than or equal to 90 percent, preferably more than or equal to 95 percent, and more preferably more than or equal to 98 percent; the breaking strength of the polyurethane fibers is 1 to 30cN/dtex, preferably 3 to 25cN/dtex, more preferably 5 to 20 cN/dtex.
Preferably, the binder is one or more of bentonite, water glass, slaked lime, sodium humate and organic composite binder.
Preferably, the particle size of the binder is 0 to 0.3mm, preferably 0.01 to 0.2mm, more preferably 0.03 to 0.1 mm.
According to a second embodiment of the present invention, there is provided a low-temperature and rapid iron ore oxidized pellet manufacturing system:
a low-temperature and rapid iron ore oxidized pellet manufacturing system applying the low-temperature and rapid iron ore oxidized pellet manufacturing method according to the first embodiment, the system comprising: the device comprises a mixing device 1, a pellet 3D printing device 2, a drying device 3 and a roasting device 4; the discharge hole of the mixing device 1 is communicated with the feed hole of the pellet 3D printing device 2; the discharge hole of the pellet 3D printing device 2 is communicated with the feed inlet of the drying device 3; and the discharge hole of the drying device 3 is communicated with the feed inlet of the roasting device 4.
Preferably, the pellet 3D printing device 2 is a 3D printing apparatus using powdered metal as a raw material; the 3D printing equipment is made into honeycomb-shaped pellets through an additive technology.
Example 1
100 parts of Brazilian hematite concentrate, 1.8 parts of Indian bentonite, 0.08 part of nano titanium dioxide, 0.1 part of micron vanadium pentoxide, 1.6 parts of high elastic modulus polyethylene fiber and 10 parts of tap water are measured in proportion and mixed to obtain a final mixture. Wherein the granularity of the Brazilian hematite concentrate is-0.074 mm and is 92.50%, the water absorption of the Indian bentonite is 230%, the grain size range of the nano titanium dioxide is less than or equal to 30nm, the grain size range of the micron vanadium pentoxide is less than or equal to 20 mu m, the average length range of the high modulus polyethylene fiber is 14mm, and the elastic modulus is 100N/tex.
A comparative test of the green pellets obtained by adopting the traditional pelletizing disc and the green pellets obtained by adopting a 3D printing technology is carried out, the green pellet particle size of the green pellets obtained by adopting the traditional pelletizing disc is 8-12 mm, the falling strength is 4.2 times/0.5 m, the compressive strength is 10.4N/pellet, and the bursting temperature is 469 ℃; the green pellet obtained by 3D printing technology has particle size of 11mm, falling strength of 9.6 times/0.5 m, compression strength of 15.4N/pellet and bursting temperature of 598 ℃.
After the qualified green pellets prepared under the two conditions are dried for 3 hours at 105 ℃, a roasting comparison test without adopting a 3D printing technology and by adopting the 3D printing technology is developed. The pellets which do not adopt the 3D printing technology are preheated at 900 ℃ for 10min and roasted at 1250 ℃ for 15min, and the compression strength of the prepared finished pellet ore is 2602N/pellet; the pellets adopting the 3D printing technology are preheated at 750 ℃ for 6min and roasted at 1000 ℃ for 10min, and the compressive strength of the prepared finished pellet ore is 2834N/pellet. The preheating temperature is reduced from 900 ℃ to 750 ℃, and the preheating time is reduced from 10min to 6 min; the roasting temperature is reduced from 1250 ℃ to 1000 ℃, and the roasting time is reduced from 15min to 10 min. The quality of both green pellets and finished pellets is improved, the granularity is more uniform, and the feasibility and certain advantages of the 3D printing technology in the technical field of pellets are demonstrated.
Example 2
100 parts of a mixed ore (the ratio is 1:1) of certain magnetite in Liaoning and certain hematite concentrate in Australia, 2.8 parts of certain bentonite in Hunan, 0.12 part of nano-titanium dioxide, 2.4 parts of high-elastic modulus polyethylene fiber, 0.15 part of micron-sized vanadium pentoxide and 13.0 parts of tap water are measured in proportion and mixed to obtain a final mixed material. Wherein the granularity of certain magnetite of Liaoning is 95.65 percent when the granularity is-0.074 mm, the granularity of certain hematite concentrate of Australia is 93.20 percent when the granularity is-0.074 mm, the water absorption of certain bentonite in Hunan is 185 percent, the grain size range of nano titanium dioxide is less than or equal to 20nm, the grain size range of micron vanadium pentoxide is less than or equal to 15 mu m, the average length of the high elastic modulus polyethylene fiber is 18mm, and the elastic modulus is 120N/tex.
A comparative test of the green pellets obtained by adopting the traditional pelletizing disc and the green pellets obtained by adopting a 3D printing technology is carried out, the green pellet particle size of the green pellets obtained by adopting the traditional pelletizing disc is 7-10 mm, the falling strength is 4.5 times/0.5 m, the compressive strength is 11.1N/pellet, and the bursting temperature is 476 ℃; the green pellet obtained by the 3D printing technology has the particle size of 10mm, the falling strength of 11.5 times/0.5 m, the compressive strength of 19.3N/pellet and the bursting temperature of 555 ℃.
After the qualified green pellets prepared under the two conditions are dried for 3 hours at 105 ℃, a roasting comparison test without adopting a 3D printing technology and by adopting the 3D printing technology is developed. The pellets which do not adopt the 3D printing technology are preheated at 950 ℃ for 8min and roasted at 1280 ℃ for 10min, and the compressive strength of the prepared finished pellet ore is 2765N/pellet ore; the pellets adopting the 3D printing technology are preheated at 750 ℃ for 6min and roasted at 1000 ℃ for 6min, and the compressive strength of the prepared finished pellet ore is 2841N/pellet. The preheating temperature is reduced from 950 ℃ to 750 ℃, and the preheating time is reduced from 8min to 6 min; the roasting temperature is reduced from 1280 ℃ to 1000 ℃, and the roasting time is reduced from 10min to 6 min. The quality of both green pellets and finished pellets is improved, the granularity is more uniform, and the feasibility and certain advantages of the 3D printing technology in the technical field of pellets are demonstrated.
Example 3
100 parts of mixed ore (the ratio is 1:2) of certain magnetite of Liaoning and certain hematite concentrate of Australia, 4.0 parts of certain bentonite in Hunan, 0.2 parts of nano titanium dioxide, 0.28 parts of micron-sized vanadium pentoxide, 3.0 parts of high elastic modulus polyethylene fiber and 16.0 parts of tap water are measured in proportion and mixed to obtain the final mixture. Wherein the granularity of certain magnetite in Liaoning is 95.65 percent when the granularity is-0.074 mm, the granularity of certain hematite concentrate in Australia is 93.20 percent when the granularity is-0.074 mm, the water absorption of certain bentonite in Hunan is 185 percent, the particle size range of nano titanium dioxide is less than or equal to 20nm, the particle size range of micron vanadium pentoxide is less than or equal to 15 mu m, the average length range of the high elastic modulus polyethylene fiber is 22mm, and the elastic modulus is 140N/tex.
A comparative test of the green pellets obtained by adopting the traditional pelletizing disc and the green pellets obtained by adopting a 3D printing technology is carried out, the green pellet particle size of the green pellets obtained by adopting the traditional pelletizing disc is 9-12 mm, the falling strength is 4.6 times/0.5 m, the compressive strength is 11.1N/pellet, and the bursting temperature is 454 ℃; the green pellet obtained by the 3D printing technology has the particle size of 12mm, the falling strength of 12.2 times/0.5 m, the compressive strength of 20.1N/pellet and the bursting temperature of 586 ℃.
After the qualified green pellets prepared under the two conditions are dried for 3 hours at 105 ℃, a roasting comparison test without adopting a 3D printing technology and by adopting the 3D printing technology is developed. The pellets which do not adopt the 3D printing technology are preheated at 900 ℃ for 8min and roasted at 1300 ℃ for 15min, and the compressive strength of the prepared finished pellet ore is 2879N/pellet; the pellets adopting the 3D printing technology are preheated at 700 ℃ for 6min and roasted at 1000 ℃ for 10min, and the compressive strength of the prepared finished pellets is 2901N/pellet. The preheating temperature is reduced from 900 ℃ to 700 ℃, and the preheating time is reduced from 8min to 6 min; the roasting temperature is reduced from 1300 ℃ to 1000 ℃, and the roasting time is reduced from 15min to 10 min. The quality of both green pellets and finished pellets is improved, the granularity is more uniform, and the feasibility and certain advantages of the 3D printing technology in the technical field of pellets are demonstrated.
Example 4
100 parts of Brazilian hematite concentrate, 1.8 parts of Indian bentonite, 0.08 part of nano titanium dioxide, 0.1 part of micron vanadium pentoxide, 1.6 parts of polyurethane fiber and 10.0 parts of tap water are measured in proportion and mixed to obtain a final mixture. Wherein the granularity of the Brazilian hematite concentrate is-0.074 mm and is 92.50%, the water absorption of the Indian bentonite is 230%, the grain size range of the nano titanium dioxide is less than or equal to 30nm, the grain size range of the micron vanadium pentoxide is less than or equal to 20 mu m, the polyurethane elastic fiber is polyether, the elastic elongation is 500%, the elastic recovery rate is more than or equal to 96%, and the breaking strength is 15 cN/dtex.
A comparative test of the green pellets obtained by adopting the traditional pelletizing disc and the green pellets obtained by adopting a 3D printing technology is carried out, the green pellet particle size of the green pellets obtained by adopting the traditional pelletizing disc is 7-11 mm, the falling strength is 5.0 times/0.5 m, the compressive strength is 11.2N/pellet, and the bursting temperature is 435 ℃; the green pellet obtained by 3D printing technology has particle diameter of 10mm, falling strength of 10.6 times/0.5 m, compression strength of 16.1N/pellet and bursting temperature of 573 ℃.
After the qualified green pellets prepared under the two conditions are dried for 3 hours at 105 ℃, a roasting comparison test without adopting a 3D printing technology and by adopting the 3D printing technology is developed. The pellets which do not adopt the 3D printing technology are preheated at 950 ℃ for 8min and roasted at 1280 ℃ for 12min, and the compressive strength of the prepared finished pellet ore is 2387N/pellet; the pellets adopting the 3D printing technology are preheated at 700 ℃ for 5min and roasted at 1000 ℃ for 8min, and the compressive strength of the prepared finished pellets is 2571N/pellet. The preheating temperature is reduced from 950 ℃ to 700 ℃, and the preheating time is reduced from 8min to 5 min; the roasting temperature is reduced from 1280 ℃ to 1000 ℃, and the roasting time is reduced from 12min to 8 min. The quality of both green pellets and finished pellets is improved, the granularity is more uniform, and the feasibility and certain advantages of the 3D printing technology in the technical field of pellets are demonstrated.
Example 5
100 parts of mixed ore (the ratio is 1:1) of certain magnetite in Liaoning and certain hematite concentrate in Australia, 2.8 parts of certain bentonite in Hunan, 0.12 part of nano titanium dioxide, 0.15 part of micron-sized vanadium pentoxide, 2.4 parts of polyurethane fiber and 8.0 parts of tap water are measured in proportion and mixed to obtain the final mixture. Wherein the granularity of certain magnetite of Liaoning is 95.65 percent at minus 0.074mm, the granularity of certain hematite concentrate of Australia is 93.20 percent at minus 0.074mm, the water absorption of certain bentonite of Hunan is 185 percent, the particle size range of nano titanium dioxide is less than or equal to 20nm, the particle size range of micron vanadium pentoxide is less than or equal to 15 mu m, the polyurethane elastic fiber is polyester type, the elastic elongation is 600 percent, the elastic recovery rate is more than or equal to 98 percent, and the breaking strength is 18 cN/dtex.
A comparative test of the green pellets obtained by adopting the traditional pelletizing disc and the green pellets obtained by adopting a 3D printing technology is carried out, the green pellet particle size of the green pellets obtained by adopting the traditional pelletizing disc is 9-12 mm, the falling strength is 4.8 times/0.5 m, the compressive strength is 11.5N/pellet, and the bursting temperature is 453 ℃; the green pellet obtained by 3D printing technology has particle diameter of 10mm, falling strength of 10.9 times/0.5 m, compression strength of 20.4N/pellet and bursting temperature of 596 ℃.
After the qualified green pellets prepared under the two conditions are dried for 3 hours at 105 ℃, a roasting comparison test without adopting a 3D printing technology and by adopting the 3D printing technology is developed. The pellets which do not adopt the 3D printing technology are preheated at 950 ℃ for 8min and roasted at 1250 ℃ for 12min, and the compressive strength of the prepared finished pellet ore is 2462N/pellet; the pellets adopting the 3D printing technology are preheated at 700 ℃ for 6min and roasted at 950 ℃ for 7min, and the compressive strength of the prepared finished pellet ore is 2689N/pellet. The preheating temperature is reduced from 950 ℃ to 700 ℃, and the preheating time is reduced from 8min to 6 min; the roasting temperature is reduced from 1250 ℃ to 950 ℃, and the roasting time is reduced from 12min to 7 min. The quality of both green pellets and finished pellets is improved, the granularity is more uniform, and the feasibility and certain advantages of the 3D printing technology in the technical field of pellets are demonstrated.
Example 6
100 parts of mixed ore (the ratio is 1:2) of certain magnetite of Liaoning and certain hematite concentrate of Australia, 4.0 parts of certain bentonite in Hunan, 0.2 part of nano titanium dioxide, 0.28 part of micron-sized vanadium pentoxide, 3.0 parts of polyurethane fiber and 10.0 parts of tap water are measured in proportion and mixed to obtain the final mixture. Wherein the granularity of certain magnetite of Liaoning is 95.65 percent at minus 0.074mm, the granularity of certain hematite concentrate of Australia is 93.20 percent at minus 0.074mm, the water absorption of certain bentonite of Hunan is 185 percent, the particle size range of nano titanium dioxide is less than or equal to 20nm, the particle size range of micron vanadium pentoxide is less than or equal to 15 mu m, the polyurethane elastic fiber is polyester type, the elastic elongation is 600 percent, the elastic recovery rate is more than or equal to 98 percent, and the breaking strength is 18 cN/dtex.
A comparative test of the green pellets obtained by adopting the traditional pelletizing disc and the green pellets obtained by adopting a 3D printing technology is carried out, the green pellet particle size of the green pellets obtained by adopting the traditional pelletizing disc is 8-11 mm, the falling strength is 4.6 times/0.5 m, the compressive strength is 11.2N/pellet, and the bursting temperature is 471 ℃; the green pellet obtained by 3D printing technology has particle diameter of 10mm, falling strength of 14.5 times/0.5 m, compression strength of 20.7N/pellet, and bursting temperature of 591 deg.C.
After the qualified green pellets prepared under the two conditions are dried for 3 hours at 105 ℃, a roasting comparison test without adopting a 3D printing technology and by adopting the 3D printing technology is developed. The pellets which do not adopt the 3D printing technology are preheated at 950 ℃ for 8min and roasted at 1230 ℃ for 12min, and the compressive strength of the prepared finished pellet ore is 2542N/pellet ore; the pellets adopting the 3D printing technology are preheated at 700 ℃ for 6min and roasted at 950 ℃ for 6min, and the compression strength of the prepared finished pellet ore is 2721N/pellet. The preheating temperature is reduced from 950 ℃ to 700 ℃, and the preheating time is reduced from 8min to 6 min; the roasting temperature is reduced from 1230 ℃ to 950 ℃, and the roasting time is reduced from 12min to 6 min. The quality of both green pellets and finished pellets is improved, the granularity is more uniform, and the feasibility and certain advantages of the 3D printing technology in the technical field of pellets are demonstrated.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all modifications and variations that fall within the scope of the invention without departing from the spirit of the invention be embraced by the claims.
Claims (10)
1. A low-temperature and rapid preparation method of iron ore oxidized pellets is characterized by comprising the following steps:
1) preparing a 3D printing mixture: uniformly mixing raw materials to obtain a 3D printing mixture, wherein the raw materials comprise: iron ore concentrate, a binder, titanium dioxide, vanadium pentoxide and fibers;
2) preparing pellet: preparing the 3D printing mixture into green pellets by adopting a 3D printing technology;
3) performing pretreatment: performing pre-drying treatment on the green pellets to obtain dry green pellets;
4) oxidizing and roasting treatment: and carrying out oxidation roasting treatment on the dried green pellets to obtain finished pellets.
2. The low temperature and fast iron ore oxidized pellet preparation method of claim 1, characterized in that the 3D printing mix comprises:
iron ore concentrate: 70-150 parts by weight, preferably 80-140 parts by weight, more preferably 90-120 parts by weight;
adhesive: 0.1 to 10 parts by weight, preferably 0.3 to 8 parts by weight, more preferably 0.5 to 5 parts by weight;
titanium dioxide: 0.01 to 3 parts by weight, preferably 0.03 to 2 parts by weight, more preferably 0.05 to 1 part by weight;
vanadium pentoxide: 0.01 to 3 parts by weight, preferably 0.03 to 2 parts by weight, more preferably 0.05 to 1 part by weight;
fiber: 0.01 to 3 parts by weight, preferably 0.03 to 2 parts by weight, more preferably 0.05 to 1 part by weight;
water: 1 to 40 parts by weight, preferably 2 to 30 parts by weight, more preferably 3 to 20 parts by weight.
3. The method for the low-temperature and rapid production of iron ore oxidized pellets according to claim 1 or 2, characterized in that the green pellets are honeycomb green pellets; the honeycomb green pellet ore is provided with a through hole communicated with the inside.
4. The low-temperature and rapid preparation method of iron ore oxidized pellets as claimed in claim 3, characterized in that, in the step 3), the temperature of the pre-drying process is 90 ℃ to 150 ℃, preferably 100 ℃ to 120 ℃, more preferably 104 ℃ to 108 ℃; the time of the prefabricating and drying treatment is 1-6 hours; preferably 2-4 hours.
5. The method for the low-temperature and rapid preparation of iron ore oxidized pellets as claimed in claim 4, wherein the oxidizing roasting process at step 4) comprises the steps of:
4a) firstly, preheating dry green pellets, wherein the preheating temperature is 400-800 ℃, and preferably 500-800 ℃; preheating for 5-40 min; preferably 10-30 min; after the preheating treatment is finished, the next roasting treatment is carried out;
4b) the temperature of the roasting treatment is 800-1400 ℃; preferably 800-1100 ℃; the roasting time is 5-40 min; preferably 10-20 min;
4c) and (4) cooling the roasted pellets, and taking out the pellets from the roasting device when the temperature of the pellets is reduced to 500 ℃ to obtain finished pellets.
6. The method for preparing low-temperature and rapid iron ore oxidized pellets according to claim 5, wherein the iron ore concentrate is one or more of hematite, magnetite and specularite; the iron concentrate is preferably hematite and/or magnetite; the total iron grade TFe of the iron ore concentrate is more than or equal to 60 percent, preferably more than or equal to 63 percent, and more preferably more than or equal to 66 percent; the particle size of the iron ore concentrate is 0-0.5 mm, preferably 0.01-0.2mm, and more preferably 0.05-0.1 mm; the water content of the iron concentrate is less than 10%, preferably less than 8%, more preferably less than 6%.
7. The method for preparing iron ore oxidized pellets at low temperature and high speed according to claim 6, is characterized in that the fiber is polyethylene fiber and/or polyurethane fiber, preferably the polyethylene fiber is high modulus polyethylene fiber; the polyurethane fiber is polyether and/or polyester elastic fiber; preferably, the polyethylene fibers have a length of 0.1 to 100mm, preferably 0.5 to 80mm, more preferably 1 to 50 mm; the elastic modulus of the polyethylene fiber is 50-200N/tex, preferably 80-180N/tex, more preferably 100-150N/tex; and/or
The elastic elongation of the polyurethane fiber is 400-700%, preferably 450-650%, more preferably 500-600%; the elastic recovery rate of the polyurethane fiber is more than or equal to 90 percent, preferably more than or equal to 95 percent, and more preferably more than or equal to 98 percent; the breaking strength of the polyurethane fibers is 1 to 30cN/dtex, preferably 3 to 25cN/dtex, more preferably 5 to 20 cN/dtex.
8. The method for preparing iron ore oxidized pellets at low temperature and high speed according to claim 7, wherein the binder is one or more of bentonite, water glass, slaked lime, sodium humate and organic composite binder; preferably, the particle size of the binder is 0 to 0.3mm, preferably 0.01 to 0.2mm, more preferably 0.03 to 0.1 mm.
9. A low-temperature and rapid iron ore oxidized pellet preparation system using the low-temperature and rapid iron ore oxidized pellet preparation method of any one of claims 1 to 8, wherein the system comprises: the device comprises a mixing device (1), a pellet 3D printing device (2), a drying device (3) and a roasting device (4); a discharge hole of the mixing device (1) is communicated with a feed hole of the pellet 3D printing device (2); a discharge hole of the pellet 3D printing device (2) is communicated with a feed inlet of the drying device (3); and a discharge hole of the drying device (3) is communicated with a feed inlet of the roasting device (4).
10. The system for the low-temperature and fast preparation of iron ore oxidized pellets as claimed in claim 9, characterized in that the pellet 3D printing device (2) is a 3D printing apparatus with powdered metal as raw material; the 3D printing equipment is made into honeycomb-shaped pellets through an additive technology.
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