Preparation process for cold pressing dedusting coke powder into pellets

Abstract

The invention relates to the technical field of dedusting coke powder, and discloses a preparation process for cold-pressing dedusting coke powder into pellets, which comprises the steps of dedusting coke powder recovery, dedusting coke powder mixing, ball pressing, standing, drying, size stabilization and steelmaking. According to the preparation process for cold-pressing the dedusting coke powder into the pellets, the dedusting coke powder which is qualified in quality inspection is mixed with the carbon composite adhesive, ball pressing forming is conducted, and then groove type double-roller pelletizing is conducted, so that harmful substances in the dedusting coke powder can be removed, meanwhile, the strength is moderate after pelletizing, and the dedusting coke powder is more easily absorbed by molten steel; and after quality screening and impurity removal are carried out before dedusting coke powder pressing ball forming, stable pelletizing is carried out after ball pressing is carried out, then screening is carried out, through multi-stage screening, the quality of dedusting coke powder pressing particles can be greatly improved, and the production efficiency is improved. And the steel-making effect is prevented from being influenced by mixing of defective product pellets.

Description

Technical Field

[0001] The invention relates to the technical field of dust-removed coke powder, and in particular to a preparation process of cold-pressing dust-removed coke powder into pellets. Background Art

[0002] The dust-removed coke powder used in the test is produced by the dry quenching process of the coking plant. After primary and secondary dust removal, the raw materials are collected and stored in the coke powder bin and allocated internally for the test. Through inspection and testing, the components of the dust-removed coke powder and the calcined coal carburizer are shown in Table 1. The fixed carbon content of the dust-removed coke powder is 86.26%, which is slightly lower than the calcined coal carburizer. The higher content is beneficial to carburization; among the other components of the test sample, the sulfur content is 1.16%, which is 0.83% higher than the calcined coal carburizer, and its volatile content is equivalent to that of the calcined coal carburizer. Its ash content is 12.17%, which is 3.67% higher than that of the calcined coal carburizer. The water content of the sample is 1.15%, which is 0.76% higher than that of the calcined coal carburizer. The impurity and harmful element content of the dust-removed coke powder is slightly higher than that of the calcined coal carburizer.

[0003] The requirements for fixed carbon in steelmaking recarburizers are high, and the ash, volatile matter, and impurities such as sulfur, phosphorus, and nitrogen are low. They must be dry and clean, and the particle size must be 1 to 5 mm. The particle size is moderate. If the particle size is too small, it is easy to burn. If the particle size is too coarse, it will float on the surface of the molten steel after being added to the ladle and will not be easily absorbed by the molten steel. The particle size of dust-removed coke powder is less than 0.5 mm, accounting for 99%. The particle size of dust-removed coke powder is much smaller than the requirements for recarburizers. Therefore, it is necessary to process the dust-removed coke powder before use. Summary of the invention

[0004] The object of the present invention is to provide a preparation process for cold pressing dust-removed coke powder into pellets, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: a preparation process for cold pressing dust-removed coke powder into pellets, including dust-removed coke powder recovery, dust-removed coke powder mixing, pelletizing, standing, drying, granulating, and steelmaking use;

[0006] S1. During the dust removal and coke powder recovery stage, the ground dust removal station collects the generated dust by installing dust hoods, pipes, fans and other equipment to prevent it from spreading into the air. The collected dust will be temporarily stored in the dust storage hopper or ash bin of the dust removal station;

[0007] S2, the dust removal coke powder mixing stage, the recovered dust removal coke powder and the carbon composite binder are poured into a mixing mixer according to the proportion, and during the mixing process, an appropriate amount of water is gradually added to adjust the humidity of the material, and the mixture is stirred until the binder is fully dispersed and evenly covers the surface of the dust removal coke powder;

[0008] S3, in the briquetting stage, the mixed and dusted coke powder is fed into the feed port of the powerful briquetting machine to ensure that the mixed and dusted coke powder is evenly fed into the powerful briquetting machine for briquetting. During the molding process, the pressure and speed of the equipment are controlled to ensure that the shape and size of the finished product meet the requirements. The mixed and dusted coke powder is pressed into compact pellets through the pressure and mechanical action of the powerful briquetting machine.

[0009] S4, static stage, after the powerful ball press machine presses the evenly mixed dust-removed coke powder into balls, the molded balls are statically coupled and cured for more than 24 hours, during which time the humidity is maintained appropriately to avoid problems with the balls due to excessive dryness or moisture. The humidity is controlled within a certain range, such as a relative humidity of 40% to 60%, so that the molded balls can be more stable after being formed within a certain period of time;

[0010] S5, drying stage, after the dust-removed coke powder is pressed into balls by a strong ball press and left to solidify for 24 hours, a plate dryer is used to continuously dry the formed balls. The drying time is 45 minutes, and the heating temperature of the hot air furnace of the dryer is controlled at 120°C to 320°C during this period, so that the state of the solidified balls is more stable;

[0011] S6, granulation stage, after the molding balls are dried, the molding balls are collected, and then the molding balls are sent to the groove type double roller crusher for crushing, and the molding balls are shaped into dust-removing coke powder granules after the groove type double roller crushing;

[0012] S7. During the steelmaking use stage, during steelmaking, the dust-removing coke powder pellets can be added to the steelmaking furnace according to the different types of steelmaking furnaces. In the blast furnace, the dust-removing coke powder pellets are added to the blast furnace through the blast furnace tuyere or the furnace top distributor; in the converter, they are added to the converter through the charging port or chute of the converter.

[0013] Preferably, in the S1, dust removal coke powder recovery stage, when the dust removal coke powder reaches a certain concentration range in the air, it will cause an explosion when encountering open flames or high temperatures. Therefore, during the recovery process, it should be ensured that the working area is well ventilated to avoid dust accumulation. Explosion-proof equipment, such as explosion-proof motors, explosion-proof lamps, etc., can be used, and regular inspections and maintenance should be carried out. When the dust removal coke powder is recovered, measures should be taken to prevent dust leakage, such as using a closed conveying system and collection device, and operators should wear dust masks, goggles and other personal protective equipment to reduce the harm of dust to the body.

[0014] Preferably, the S2, dust removal and coke powder mixing stage comprises the following detailed steps:

[0015] S2.1. Determine the amount of dust removal coke powder and carbon composite adhesive, and control the ratio at 4.6%. Then check the dust removal coke powder and carbon composite adhesive separately to see if they are exposed to moisture during transportation or storage. S2.2. Open the loading port of the mixing equipment, and add the dust removal coke powder and carbon composite adhesive into the mixer according to the proportion for mixing. After mixing, open the discharging port of the mixer to discharge the evenly mixed material. If the fluidity of the material is not good, a silo wall vibrator, blade stirring device and other devices can be installed to facilitate smooth discharge of the material. If the fluidity of the material is too good, the segregation of light and heavy powders caused by free fall should be avoided, and a slide device can be used to avoid secondary unevenness.

[0016] Preferably, in the S3, briquetting stage, the dust-removed coke powder, adhesive and other additives are accurately weighed according to a predetermined ratio, the proportion of various raw materials should be strictly controlled during the batching process to ensure the performance and quality of the finished briquette product, the model and specification of the briquetting machine suitable for the dust-removed coke powder briquetting are selected, and before briquetting, the briquetting machine should be debugged and inspected to ensure its normal operation and briquetting effect, the mixed materials are fed into the feed port of the briquetting machine to ensure that the materials enter the briquetting machine evenly, the pressure and speed of the briquetting machine are controlled to ensure that the shape and size of the finished product meet the requirements, the operation of the briquetting machine and the quality of the finished product should be observed during the briquetting process, and the briquetting parameters should be adjusted in time, and when briquetting the dust-removed coke powder, an appropriate gap needs to be maintained between the two pairs of rollers of the briquetting machine to ensure that the materials can pass smoothly and are subjected to sufficient pressure, and the centers of the ball sockets of the pairs of rollers must be completely symmetrical to ensure that the pressed finished balls are relatively smooth.

[0017] Preferably, in the S5, drying stage, when the modeling balls are dried, the humidity needs to be controlled during the drying process to ensure that the moisture inside the balls can be fully evaporated. Too high humidity will lead to poor drying effect, while too low humidity may accelerate the aging of the balls. The dried balls should be screened to remove unqualified balls, such as broken, deformed, etc., and the qualified balls after screening should be stored in a dry, ventilated warehouse to avoid moisture and deterioration.

[0018] Preferably, in the S5, drying stage, it is also necessary to note that the dust-removed coke powder balls after drying should be properly cooled to prevent their performance degradation or deformation due to excessive temperature. The cooling method can be selected as natural cooling or forced cooling, which should be determined according to the actual situation. The dust-removed coke powder balls after drying should be quality inspected to screen out products that do not meet the requirements. During the drying process, special attention should be paid to preventing the adhesion between the dust-removed coke powder balls. Appropriate measures can be taken, such as applying anti-sticking agents on the surface of the pressed balls or increasing the spacing of the drying equipment. During the drying process, due to the involvement of dangerous factors such as high temperature and ventilation, special attention should be paid to safety protection. Operators should wear protective equipment and strictly abide by the operating procedures. During the drying process, attention should be paid to energy saving and consumption reduction. The drying cost can be reduced by optimizing the drying process, improving equipment efficiency, and rationally utilizing waste heat.

[0019] Preferably, in the S6, granulation stage, the shaped balls are pretreated before crushing, such as screening, washing, etc., to remove impurities and parts that are not suitable for crushing in the material, thereby improving the crushing efficiency and uniformity. The pretreated material should have a certain particle size distribution, which is conducive to the uniform force of the material during the crushing process. The crushing speed is reasonably adjusted according to the hardness and humidity of the material. The appropriate crushing speed can ensure that the material is fully crushed and mixed during the crushing process. According to the material characteristics and production requirements, the roller surface gap is reasonably adjusted to ensure that the material can be crushed evenly. The trough-type double-roll crusher is equipped with a wedge or gasket adjustment device. By adjusting these devices, the gap between the rollers is controlled, thereby achieving control of the discharge particle size.

[0020] Preferably, in the S6, granulation stage, it is also necessary to pay attention to the fact that roller surface wear will lead to uneven crushing force, thus affecting the crushing uniformity. Regularly check the wear of the roller surface of the grooved roller crusher, and replace the severely worn roller surface in time to ensure uniform distribution of crushing force and ensure that the feeding system of the grooved roller crusher can feed evenly and stably to avoid material accumulation or blockage in the crushing chamber. Uniform feeding can be achieved by adjusting the feed port size, optimizing the feeding speed, etc.

[0021] Preferably, in the S7, steelmaking use stage, it is first necessary to check the operating status of the adding equipment, such as conveyor belts, feeders, etc., to ensure that they can operate normally, clean the dust and debris inside the equipment to avoid interference with the adding process, and then conduct quality inspection on the dust-removed coke powder pellets to ensure that the moisture content, particle size distribution, iron content and other parameters of the dust-removed coke powder pellets meet the production requirements, and check whether the pellets contain impurities, such as stones, metal fragments, etc., to ensure that they will not have a negative impact on the steelmaking process.

[0022] Preferably, the dust-removed coke powder pellets are added to the steelmaking furnace through a conveyor belt or a feeder, and the adding speed is controlled during the addition to avoid excessive impact on the steelmaking process. After adding the dust-removed coke powder pellets, the changes in the steelmaking process, such as the furnace temperature and the reaction speed, are closely observed. According to the observation results, the addition amount and the timing of addition are timely adjusted, and the molten steel after the addition of the dust-removed coke powder pellets is sampled and analyzed to detect its composition and quality. When the dust-removed coke powder pellets are added to the steelmaking equipment, if the steelmaking equipment allows, the dust-removed coke powder pellets can be directly added to the steelmaking furnace through a conveyor belt or a feeder. If the steelmaking equipment does not allow direct addition, the dust-removed coke powder pellets can be first added to other auxiliary equipment, such as a preheating furnace, a mixer, etc. for indirect addition. In the auxiliary equipment, the dust-removed coke powder pellets can be mixed and preheated with other raw materials to increase their reactivity. After uniform mixing, the dust-removed coke powder pellets are added to the steelmaking furnace.

[0023] Compared with the prior art, the present invention provides a preparation process for cold pressing dust-removed coke powder into pellets, which has the following beneficial effects:

[0024] 1. The preparation process of cold-pressing dust-removed coke powder into pellets can remove harmful substances in the dust-removed coke powder by mixing the dust-removed coke powder that has passed quality inspection with a carbon composite binder and pressing the pellets into balls before performing groove-type roller pelletizing. At the same time, the force after pelletizing is moderate, so the dust-removed coke powder is more easily absorbed by molten steel and will not float on the surface of the molten steel, thereby promoting steelmaking efficiency and improving steelmaking quality.

[0025] 2. The preparation process of cold pressing the dust-removed coke powder into pellets is to screen the quality and remove impurities before the dust-removed coke powder is pressed into pellets, and then stabilize the pellets after pressing, and then screen them. Through multi-stage screening, the quality of the dust-removed coke powder pellets can be greatly improved, and the mixing of defective pellets can be avoided to affect the steelmaking effect.

[0026] 3. The preparation process of cold pressing the dust-removed coke powder into pellets is to first cool and stabilize the pellets after being pressed by a strong pellet press, and then dry them through drying equipment. This can effectively increase the dryness of the dust-removed coke powder after being pressed into pellets, and avoid the dispersion of wet molded balls during the whole row of pelletizing after the mixing of water, and even affect the subsequent steelmaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the preparation process of the present invention. DETAILED DESCRIPTION

[0028] like Figure 1 As shown, the present invention provides a technical solution: a preparation process for cold-pressing dust-removed coke powder into pellets, including dust-removed coke powder recovery, dust-removed coke powder mixing, pelletizing, standing, drying, granulating, and steelmaking;

[0029] S1. During the dust removal and coke powder recovery stage, the ground dust removal station collects the generated dust by installing dust hoods, pipes, fans and other equipment to prevent it from spreading into the air. The collected dust will be temporarily stored in the dust storage hopper or ash bin of the dust removal station;

[0030] S2, the dust removal coke powder mixing stage, the recovered dust removal coke powder and the carbon composite binder are poured into a mixing mixer according to the proportion, and during the mixing process, an appropriate amount of water is gradually added to adjust the humidity of the material, and the mixture is stirred until the binder is fully dispersed and evenly covers the surface of the dust removal coke powder;

[0031] S3, in the briquetting stage, the mixed and dusted coke powder is fed into the feed port of the powerful briquetting machine to ensure that the mixed and dusted coke powder is evenly fed into the powerful briquetting machine for briquetting. During the molding process, the pressure and speed of the equipment are controlled to ensure that the shape and size of the finished product meet the requirements. The mixed and dusted coke powder is pressed into compact pellets through the pressure and mechanical action of the powerful briquetting machine.

[0032] S4, static stage, after the powerful ball press machine presses the evenly mixed dust-removed coke powder into balls, the molded balls are statically coupled and cured for more than 24 hours, during which time the humidity is maintained appropriately to avoid problems with the balls due to excessive dryness or moisture. The humidity is controlled within a certain range, such as a relative humidity of 40% to 60%, so that the molded balls can be more stable after being formed within a certain period of time;

[0033] S5, drying stage, after the dust-removed coke powder is pressed into balls by a strong ball press and left to solidify for 24 hours, a plate dryer is used to continuously dry the formed balls. The drying time is 45 minutes, and the heating temperature of the hot air furnace of the dryer is controlled at 120°C to 320°C during this period, so that the state of the solidified balls is more stable;

[0034] S6, granulation stage, after the molding balls are dried, the molding balls are collected, and then the molding balls are sent to the groove type double roller crusher for crushing, and the molding balls are shaped into dust-removing coke powder granules after the groove type double roller crushing;

[0035] S7. During the steelmaking use stage, during steelmaking, the dust-removing coke powder pellets can be added to the steelmaking furnace according to the different types of steelmaking furnaces. In the blast furnace, the dust-removing coke powder pellets are added to the blast furnace through the blast furnace tuyere or the furnace top distributor; in the converter, they are added to the converter through the charging port or chute of the converter.

[0036] S1. During the dust removal coke powder recovery stage, when the dust removal coke powder reaches a certain concentration range in the air, it will cause an explosion when exposed to open flames or high temperatures. Therefore, during the recovery process, the work area should be well ventilated to avoid dust accumulation. Explosion-proof equipment such as explosion-proof motors and explosion-proof lamps can be used, and regular inspections and maintenance should be carried out. When recycling dust removal coke powder, measures should be taken to prevent dust leakage, such as using closed conveying systems and collection devices. Operators should wear personal protective equipment such as dust masks and goggles to reduce the harm of dust to the body.

[0037] S2, the dust removal and coke powder mixing stage includes the following detailed steps:

[0038] S2.1. Determine the amount of dust removal coke powder and carbon composite adhesive, and control the ratio at 4.6%. Then check the dust removal coke powder and carbon composite adhesive separately to see if they are exposed to moisture during transportation or storage. S2.2. Open the loading port of the mixing equipment, and add the dust removal coke powder and carbon composite adhesive into the mixer according to the proportion for mixing. After mixing, open the discharging port of the mixer to discharge the evenly mixed material. If the fluidity of the material is not good, a silo wall vibrator, blade stirring device and other devices can be installed to facilitate smooth discharge of the material. If the fluidity of the material is too good, the segregation of light and heavy powders caused by free fall should be avoided, and a slide device can be used to avoid secondary unevenness.

[0039] S3. In the briquetting stage, the dust-removed coke powder, adhesive and other additives shall be accurately weighed according to the predetermined ratio. The proportion of various raw materials shall be strictly controlled during the batching process to ensure the performance and quality of the finished briquette products. The model and specification of the briquette press suitable for the dust-removed coke powder briquetting shall be selected. Before briquetting, the briquette press shall be debugged and inspected to ensure its normal operation and briquetting effect. The mixed materials shall be fed into the feed port of the briquette press to ensure that the materials enter the briquette press evenly. The pressure and speed of the briquette press shall be controlled to ensure that the shape and size of the finished product meet the requirements. During the briquetting process, attention shall be paid to observing the operation of the briquette press and the quality of the finished product, and the briquetting parameters shall be adjusted in time. When briquetting the dust-removed coke powder, an appropriate gap shall be maintained between the two pairs of rollers of the briquette press to ensure that the materials can pass smoothly and are subjected to sufficient pressure. The centers of the ball sockets of the pairs of rollers must be completely aligned to ensure that the pressed finished balls are relatively smooth.

[0040] S5. Drying stage: When drying the modeling balls, the humidity needs to be controlled during the drying process to ensure that the moisture inside the balls can be fully evaporated. Too high humidity will lead to poor drying effect, while too low humidity may accelerate the aging of the balls. The balls should be screened after drying to remove unqualified balls, such as broken, deformed, etc. The qualified balls after screening should be stored in a dry, ventilated warehouse to avoid moisture and deterioration.

[0041] S5. During the drying stage, it should also be noted that the dust-removed coke powder balls should be properly cooled after drying to prevent their performance from deteriorating or deforming due to excessive temperature. The cooling method can be natural cooling or forced cooling, which should be determined according to the actual situation. The dust-removed coke powder balls should be quality inspected after drying to screen out products that do not meet the requirements. During the drying process, special attention should be paid to preventing the adhesion between the dust-removed coke powder balls. Appropriate measures can be taken, such as applying anti-sticking agent on the surface of the pressed balls or increasing the spacing of the drying equipment. During the drying process, due to the involvement of dangerous factors such as high temperature and ventilation, special attention should be paid to safety protection. Operators should wear protective equipment and strictly abide by the operating procedures. During the drying process, attention should be paid to energy saving and consumption reduction. The drying cost can be reduced by optimizing the drying process, improving equipment efficiency, and rationally utilizing waste heat.

[0042] S6. In the granulation stage, the shaped balls are pretreated before crushing, such as screening and washing, to remove impurities and parts that are not suitable for crushing, thereby improving the crushing efficiency and uniformity. The pretreated materials should have a certain particle size distribution, which is conducive to the uniform force of the materials during the crushing process. According to the hardness and humidity of the materials, the crushing speed is reasonably adjusted. The appropriate crushing speed can ensure that the materials are fully crushed and mixed during the crushing process. According to the material characteristics and production needs, the roller surface gap is reasonably adjusted to ensure that the materials can be crushed evenly. The trough-type double-roll crusher is equipped with a wedge or gasket adjustment device. By adjusting these devices, the gap between the rollers is controlled, thereby achieving control of the discharge particle size. S6. In the granulation stage, it is also necessary to pay attention to the fact that roller surface wear will lead to uneven crushing force, thus affecting the uniformity of crushing. Regularly check the wear of the roller surface of the trough type roller crusher, and replace the severely worn roller surface in time to ensure uniform distribution of crushing force and ensure that the feeding system of the trough type roller crusher can feed evenly and stably to avoid material accumulation or blockage in the crushing chamber. Uniform feeding can be achieved by adjusting the feed port size, optimizing the feeding speed, etc.

[0043] S7. During the steelmaking use stage, it is first necessary to check the operating status of the adding equipment, such as conveyor belts, feeders, etc., to ensure that they can operate normally, clean the dust and debris inside the equipment to avoid interference with the adding process, and then conduct quality inspection on the dust-removed coke powder pellets to ensure that the moisture content, particle size distribution, iron content and other parameters of the dust-removed coke powder pellets meet the production requirements, and check whether the pellets contain impurities, such as stones, metal fragments, etc., to ensure that they will not have a negative impact on the steelmaking process. Add the dust-removed coke powder pellets to the steelmaking furnace through a conveyor belt or a feeder. Control the adding speed during adding to avoid excessive impact on the steelmaking process. After adding the dust-removed coke powder pellets, closely observe the changes in the steelmaking process, such as furnace temperature and reaction speed. According to the observation results, timely adjust the addition amount and timing of addition. Take samples of the molten steel after adding the dust-removed coke powder pellets to detect its composition and quality. When adding the dust-removed coke powder pellets to the steelmaking equipment, if the steelmaking equipment allows, the dust-removed coke powder pellets can be directly added to the steelmaking furnace through a conveyor belt or a feeder. If the steelmaking equipment does not allow direct addition, the dust-removed coke powder pellets can be added to other auxiliary equipment first, such as a preheating furnace, a mixer, etc. for indirect addition. In the auxiliary equipment, the dust-removed coke powder pellets can be mixed and preheated with other raw materials to increase their reaction activity. After mixing evenly, the dust-removed coke powder pellets are added to the steelmaking furnace.

[0044] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A preparation process for cold pressing dust-removed coke powder into pellets, characterized in that: Including dust removal coke powder recovery, dust removal coke powder mixing, briquetting, static, drying, granulation, and steelmaking; S1. During the dust removal and coke powder recovery stage, the ground dust removal station collects the generated dust by installing dust hoods, pipes and fans to prevent it from spreading into the air. The collected dust will be temporarily stored in the dust storage hopper or ash bin of the dust removal station; S2, the dust removal coke powder mixing stage, the recovered dust removal coke powder and the carbon composite binder are poured into a mixing mixer according to the proportion, and during the mixing process, an appropriate amount of water is gradually added to adjust the humidity of the material, and the mixture is stirred until the binder is fully dispersed and evenly covers the surface of the dust removal coke powder; S3, in the briquetting stage, the mixed and dusted coke powder is fed into the feed port of the powerful briquetting machine to ensure that the mixed and dusted coke powder is evenly fed into the powerful briquetting machine for briquetting. During the molding process, the pressure and speed of the equipment are controlled to ensure that the shape and size of the finished product meet the requirements. The mixed and dusted coke powder is pressed into compact pellets through the pressure and mechanical action of the powerful briquetting machine. S4, static stage, after the powerful ball press machine presses the evenly mixed dust-removed coke powder into balls, the molded balls are statically coupled and cured for more than 24 hours, during which time the humidity is maintained appropriately to avoid problems with the balls due to excessive dryness or moisture. The humidity is controlled within a certain range, such as a relative humidity of 40% to 60%, so that the molded balls can be more stable after being formed within a certain period of time; S5, drying stage, after the dust-removed coke powder is pressed into balls by a strong ball press and left to solidify for 24 hours, a plate dryer is used to continuously dry the formed balls. The drying time is 45 minutes, and the heating temperature of the hot air furnace of the dryer is controlled at 120°C to 320°C during this period, so that the state of the solidified balls is more stable; S6, granulation stage, after the molding balls are dried, the molding balls are collected, and then the molding balls are sent to the groove type double roller crusher for crushing, and the molding balls are shaped into dust-removing coke powder granules after the groove type double roller crushing; S7. During the steelmaking use stage, during steelmaking, the dust-removing coke powder pellets can be added to the steelmaking furnace according to the different types of steelmaking furnaces. In the blast furnace, the dust-removing coke powder pellets are added to the blast furnace through the blast furnace tuyere or the furnace top distributor; in the converter, they are added to the converter through the charging port or chute of the converter.

2. The process for preparing pellets by cold pressing dust-removed coke powder according to claim 1, characterized in that: In the S1 dust-removed coke powder recovery stage, when the dust-removed coke powder reaches a certain concentration range in the air, it will cause an explosion when exposed to open flames or high temperatures. Therefore, during the recovery process, the working area should be well ventilated to avoid dust accumulation. Explosion-proof equipment, such as explosion-proof motors and explosion-proof lamps, can be used, and regular inspections and maintenance should be carried out.

3. The process for preparing pellets by cold pressing dust-removed coke powder according to claim 1, characterized in that: The S2 dust removal and coke powder mixing stage includes the following detailed steps: S2.

1. Determine the amount of dust removal coke powder and carbon composite adhesive, and control the ratio at 4.6%. Then check the dust removal coke powder and carbon composite adhesive to see if they are damp during transportation or storage. S2.

2. Open the loading port of the mixing equipment, add the dust-removing coke powder and the carbon composite adhesive into the mixer in proportion and mix them. After mixing, open the discharging port of the mixer to discharge the evenly mixed materials. If the fluidity of the material is not good, you can install devices such as silo wall vibrators and blade stirring to facilitate smooth material discharge. If the fluidity of the material is too good, the segregation of light and heavy powders caused by free fall should be avoided, and a slide device can be used to avoid secondary unevenness.

4. The process for preparing pellets by cold pressing dust-removed coke powder according to claim 1, characterized in that: In the S3 briquetting stage, the dust-removed coke powder, adhesive and other additives are accurately weighed according to the predetermined ratio. The proportion of various raw materials should be strictly controlled during the batching process to ensure the performance and quality of the finished briquette products. The briquetting machine model and specifications suitable for dust-removed coke powder briquetting are selected. Before briquetting, the briquetting machine should be debugged and inspected to ensure its normal operation and briquetting effect. The mixed materials are fed into the feed port of the briquetting machine to ensure that the materials enter the briquetting machine evenly. The pressure and speed of the briquetting machine are controlled to ensure that the shape and size of the finished product meet the requirements.

5. The process for preparing pellets by cold pressing dust-removed coke powder according to claim 1, characterized in that: In the S5 drying stage, when the modeling ball is dried, the humidity needs to be controlled during the drying process to ensure that the water inside the ball can be fully evaporated. Too high humidity will lead to poor drying effect, while too low humidity may accelerate the aging of the ball.

6. The process for preparing pellets by cold pressing dust-removed coke powder according to claim 5, characterized in that: In the S5 drying stage, it is also necessary to note that the dried dedusted coke powder balls should be properly cooled to prevent their performance degradation or deformation due to excessive temperature. The cooling method can be natural cooling or forced cooling, which should be determined according to actual conditions. The dried dedusted coke powder balls should be quality inspected to screen out products that do not meet the requirements.

7. The process for preparing pellets by cold pressing dust-removed coke powder according to claim 1, characterized in that: In the S6 granulation stage, the molded balls are pretreated before crushing to remove impurities and parts that are not suitable for crushing in the material. The pretreated material should have a certain particle size distribution, which is conducive to uniform force on the material during the crushing process. The crushing speed is reasonably adjusted according to the characteristics of the material such as hardness and humidity. The appropriate crushing speed can ensure that the material is fully crushed and mixed during the crushing process.

8. The process for preparing pellets by cold pressing dust-removed coke powder according to claim 7, characterized in that: In the S6 granulation stage, it is also necessary to pay attention to the fact that roller surface wear will lead to uneven crushing force, thus affecting the crushing uniformity. Regularly check the wear of the roller surface of the grooved roller crusher, replace the severely worn roller surface in time, and achieve uniform feeding by adjusting the feed port size and optimizing the feeding speed.

9. The process for preparing pellets by cold pressing dust-removed coke powder according to claim 1, characterized in that: During the S7 steelmaking use phase, it is first necessary to check the operating status of the adding equipment and clean the dust and debris inside the equipment.

10. The process for preparing pellets by cold pressing dust-removed coke powder according to claim 9, characterized in that: During the S7 steelmaking use stage, the dust-removed coke powder pellets are added to the steelmaking furnace through a conveyor belt or a feeder, and the adding speed is controlled. After the dust-removed coke powder pellets are added, the changes in the steelmaking process, such as the furnace temperature and the reaction speed, are closely observed. According to the observation results, the addition amount and the timing of addition are adjusted in time. The molten steel after the dust-removed coke powder pellets are added is sampled and analyzed to detect its composition and quality.

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