An experimental method for improving the stability of sintering production experimental results

Abstract

The application discloses an experimental method for improving the stability of sintering production experimental results, and belongs to the technical field of sintering experiments. The method can solve the problems of imperfect pre-treatment, uneven mixing of raw materials, low degree of automatic control in the sintering process and insufficient operation precision by adopting fine operation steps such as perfecting pre-treatment, strengthening mixing, twice material scraping, twice granulation, precise material distribution, strengthening cooling and reasonably setting experimental parameters. The method can achieve the effects of uniform mixing of raw materials, high stability of sintering cup experimental results and excellent difference control of sintering cup parallel experiment. The difference of the drum index of the parallel experiment meets the allowable difference (Delta T is less than or equal to 1.4%) of the drum index of the parallel sample in the industry standard YBT 5166-1993 'Method for Determining the Drum Strength of Sintered Ore and Pellet Ore'.

Description

Technical Field

[0001] The invention belongs to the technical field of sintering experiments, and in particular relates to an experimental method for improving the stability of sintering production experimental results. Background Art

[0002] Sintering cups are a series of simulation devices, smaller than actual production equipment, built based on similar principles. They can simulate sintering process parameters according to sintering production requirements and conduct iron ore sintering experiments, reflecting the sintering process and changes in sintered ore quality. Due to the large number of instruments, numerous experimental steps, high speed, and complex experimental procedures involved in sintering cup experiments, any inaccurate control of the experimental process can lead to large differences in experimental results (specifically, large fluctuations in the data from parallel experiments), resulting in inaccurate results from sintering cup experiments.

[0003] At present, the sintering cup experimental equipment of some steel mills and scientific research institutions has some shortcomings to a certain extent, such as imperfect pre-pretreatment, uneven mixing of raw materials, insufficient degree of automation control of the sintering process (some equipment cannot automatically control the sintering negative pressure, cooling negative pressure and cooling end temperature, and requires manual adjustment and control), and insufficient operation (such as failure to reasonably set the experimental parameters according to the climatic conditions, failure to clean the barrel wall of the material, etc.), resulting in insufficient stability of the sintering cup experimental results. Summary of the Invention

[0004] To this end, the present invention provides an experimental method for improving the stability of sintering production experimental results, which can solve the problems of imperfect pre-pretreatment, uneven mixing of raw materials, low degree of automation control of the sintering process, and insufficient operation, thereby ensuring the stability of the sintering cup experimental results.

[0005] In order to achieve the above object, the present invention provides the following technical solution: an experimental method for improving the stability of sintering production experimental results, comprising the following steps:

[0006] Before the experiment, the drum mixer and drum granulator were pre-treated. The mixed material from the production site was placed in the drum mixer. A specified amount of water was poured into the storage tank of the drum mixer's atomizing water spray system. The drum mixer was started to mix the raw materials. After the drum mixer rotated forward and reverse for a specified period of time, the discharge gate was opened to discharge the mixed material into the receiving hopper.

[0007] Turn on the pouring button of the hopper to pour the mixed material into the cylindrical granulator; adjust the cylindrical granulator to the first set angle, the second set angle, and the third set angle in the horizontal direction in sequence, and rotate the cylindrical granulator at the set angles to fully wet the cylindrical granulator; after the cylindrical granulator is wetted, pour the mixed material into the barrel for storage;

[0008] Carry out pre-treatment on the sintering cup. When the raw material mixing operation of the first cup of the day reaches the specified time, start the cup drying program, ignite the igniter and move it to the top of the sintering cup to preheat the sintering cup. The drying time is 40s to 60s to ensure that the temperature of the cup bottom is 60℃ to 80℃ when the mixed material is placed in the cup.

[0009] Weigh the raw materials required for the sintering experiment on an electronic scale, pour the weighed raw materials into the drum mixer, calculate the water consumption based on the amount of raw materials, and pour the corresponding amount of water into the storage tank of the atomizing water spray system;

[0010] Turn on the drum mixer to mix the raw materials. After the raw material mixing operation is completed, turn on the hopper operation button to pour the raw materials into the drum granulator;

[0011] The drum granulator is started to perform a raw material granulation operation, and the raw material granulation operation includes a first granulation and a second granulation. During the first granulation process, the drum granulator rotates in a horizontal state. During the second granulation process, the drum granulator rotates at a fourth set angle with the horizontal direction;

[0012] The granulated mixture is weighed through a transfer hopper and poured into the sintering cup. The mixture in the sintering cup is flattened and the height of the material column is recorded. The exhaust fan is turned on to ignite the sintering. The entire sintering process is controlled by the sintering cup experimental control software.

[0013] As a preferred experimental method for improving the stability of sintering production experimental results, 20 kg of the production site mixture is placed in a drum mixer, and 500 ml to 700 ml of water is poured into the storage tank of the atomizing water spray system of the drum mixer; the first set angle is 45°, the second set angle is 30°, and the third set angle is 15°. The drum granulator is rotated at the set angles for at least 30 seconds to fully wet the drum granulator; when the drum granulator is rotated at the third set angle of 15°, the outer wall of the drum granulator is struck 8 to 10 times with a rubber hammer.

[0014] Pre-treatment of the drum mixer and drum granulator primarily ensures consistent internal wetting of the mixer and granulator for each experiment. The process is as follows: Approximately 20 kg of the production mix is ​​placed in the drum mixer. 500-700 ml of water (the amount of water depends on the moisture content of the mix and weather conditions) is poured into the atomizing water spray system's storage tank. The drum mixer is started to mix the raw materials, rotating forward while adding water for 1 minute. After 30 seconds of reverse rotation, the discharge gate is opened to discharge the mixture into the hopper. The drum is then manually cleaned of any sticking material from the walls until no visible buildup is observed. The scraper is then activated to rotate forward for 30 seconds to clean any sticking material from the walls. The remaining material is then manually cleaned again. The hopper's discharge button is activated to pour the raw materials into the granulator. The granulator is adjusted to approximately 45°, 30°, and 15° (from the horizontal) and rotated for 30 seconds each to ensure full wetting. At the beginning of the third rotation, the outer wall of the drum granulator needs to be hit 8 to 10 times with a rubber hammer to prevent the inner wall of the drum granulator from sticking. After the drum granulator is wetted, the mixed material is poured into the barrel for storage.

[0015] As a preferred experimental method for improving the stability of sintering production test results, pre-conditioning the sintering cup ensures a consistent bottom temperature across all test batches. This pre-conditioning is accomplished through a cup drying program. During the first test batch of each day, which lasts for 4 minutes while the raw materials are mixed, the drying program is initiated. The igniter is then ignited and rotated over the sintering cup to preheat it. The drying time ranges from 40 to 60 seconds, adjusted according to the season, to ensure a bottom temperature of 60 to 80°C when the mixture is filled.

[0016] As a preferred experimental method to improve the stability of sintering production experimental results, various raw materials required for the sintering experiment are weighed on an electronic scale, with the total weight of raw materials for each experiment being approximately 53 kg; the weighed raw materials are poured into a drum mixer, and the calculated water content is poured into the storage tank of the atomizing water spray system.

[0017] As a preferred experimental method for improving the stability of sintering production experimental results, when the drum mixer is turned on for raw material mixing, dry mixing is first performed, and the drum mixer is turned on and rotated forward for 1 minute, and then reversed for 30 seconds; then water is added for 1 minute while the drum mixer rotates forward, and the scraper device is turned on and rotated forward for 30 seconds to loosen the sticky material on the drum wall of the drum mixer. After reversing for 30 seconds, the discharge gate is opened to discharge the mixture into the receiving hopper.

[0018] As a preferred experimental method for improving the stability of sintering production experimental results, when the cylindrical granulator is turned on for raw material granulation operation, the first granulation time is 3 minutes; the second granulation time is 3 minutes, and during the second granulation process, the cylindrical granulator rotates at a fourth set angle of 30° with the horizontal direction; at the beginning of the second granulation, the outer wall of the cylindrical granulator is knocked 8 to 10 times with a rubber hammer.

[0019] The raw materials undergo the primary granulation process in the drum granulator (i.e., the raw materials move in a rolling motion, gradually growing from fine to coarse particles). The granulation process lasts for 6 minutes and is divided into two stages. The first granulation process lasts for 3 minutes, with the drum granulator rotating horizontally. The second granulation process lasts for 3 minutes, with the drum granulator rotating at an angle of approximately 30 degrees to the horizontal. At the beginning of the second granulation process, the outer wall of the drum granulator is manually struck 8 to 10 times with a rubber hammer to prevent material from sticking to the inner wall. This two-stage granulation process ensures excellent granulation results while also maintaining uniformity in the mixture's particle size and composition.

[0020] As a preferred experimental method to improve the stability of sintering production test results, the pelletized mixture was weighed through a transfer hopper and then poured into a sintering cup. The mixture in the sintering cup was flattened and the height of the material column was recorded. To ensure the accuracy of the material distribution, the weight error of the material distribution in the parallel experiments was controlled within 0.1kg (the total weight of the material distribution was approximately 51kg).

[0021] As a preferred experimental method to improve the stability of sintering production experimental results, the entire sintering process is automatically controlled by sintering cup experiment control software. The main control process parameter setting ranges are as follows: ignition temperature 900℃ to 1100℃, ignition time 80s to 120s, pre-burning temperature 800℃ to 1000℃, end judgment temperature is a 10℃ to 60℃ decrease from the highest point temperature, cooling end temperature 100℃ to 200℃, ignition negative pressure 5.0 kPa to 10.0 kPa, sintering negative pressure 8.0 kPa to 16.0 kPa, and cooling negative pressure 5.0 kPa to 10.0 kPa. The specific process parameter data for each experiment can be set according to experimental conditions, experimental objectives, and weather conditions. Once set, it will remain unchanged within the experiment. Since the sintering process is primarily dependent on the properties of the raw materials themselves, while the cooling process can be intervened and controlled, in order to better simulate the actual sintering site and adapt to weather changes, the cooling end temperature is adjusted and controlled. In summer, when the temperature is higher, the cooling end temperature is controlled at the lower limit. In other seasons, due to large temperature fluctuations or lower temperatures, the cooling end temperature can be appropriately increased. The sintering process is completely controlled by the set control parameters and automatically operated by the sintering cup experiment control software, eliminating the influence of human interference factors.

[0022] As a preferred experimental method for improving the stability of sintering production experimental results, it also includes: after the sintering process is completed, the sintered ore is poured out from the sintering cup, and after crushing, the sintered ore drop test and screening test are carried out, after weighing the sintered ore of each particle size, the sintered ore yield index is calculated, and the sintered ore of 10mm to 40mm particle size is proportionally weighed to a specified weight of sintered ore for drum index testing; after the sintering process is completed, a drop test is also carried out using a drop strength testing machine, and a screening test is carried out using screening equipment.

[0023] After the sintering process is completed, the sintered ore is poured from the sintering cup and crushed before undergoing a drop test and screening test. The sintered ore of each particle size is then weighed to calculate the sintered ore yield index. 7.5 kg of sintered ore with a particle size of 10 mm to 40 mm is weighed proportionally for the drum index test. The drop test is conducted using a drop strength testing machine with a drop height of 2 m and two drops. The screening test is conducted using a screening device with a sieve plate size of 800 mm × 500 mm and five sieve plates with different apertures: 40 × 40 mm, 25 × 25 mm, 16 × 16 mm, 10 × 10 mm, and 5 × 5 mm. The screening time is 45 seconds. The drum index test is conducted using a drum test device with specifications of Φ1000 × 250 mm, 25 ± 1 revolutions, and an 8-minute drum run time.

[0024] As a preferred experimental method to improve the stability of sintering production test results, the sintering production test evaluation indicators include vertical sintering speed, utilization coefficient, yield rate, and drum index. The indicator calculation formula is:

[0025] Vertical sintering speed = (material layer height - bottom material height) ÷ sintering time; vertical sintering speed unit is mm / min;

[0026] Utilization coefficient = (mass of finished ore - mass of base material) ÷ ​​(sintering area × sintering time); Utilization coefficient unit t / (m 2 h);

[0027] Finished product rate = (quality of finished ore - quality of base material) ÷ ​​(quality of sintered cake - quality of base material) × 100%;

[0028] Drum index = mass of sintered ore larger than 6.3 mm after drumming ÷ mass of sintered ore entering the drum × 100%.

[0029] The present invention has the following advantages: by adopting refined operation steps such as perfect pre-pretreatment, enhanced mixing, two-time scraping, two-time granulation, precise material distribution, enhanced cooling, and reasonable setting of experimental parameters, the problems of imperfect pre-pretreatment, uneven mixing of raw materials, low degree of automation control of the sintering process, and insufficiently refined operation can be solved; the effects of uniform mixing of raw materials, high stability of sintering cup test results, and excellent control of the difference of parallel sintering cup experiments can be achieved; the difference of the drum index of the parallel experiments meets the allowable difference of the drum index of parallel samples (ΔT≤1.4%) in the industry standard YBT 5166-1993 "Determination of drum strength of sintered ore and pellets". BRIEF DESCRIPTION OF THE DRAWINGS

[0030] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely exemplary, and those skilled in the art can, without inventive effort, derive other implementation drawings based on the provided drawings.

[0031] Figure 1 This is a schematic flow chart of an experimental method for improving the stability of sintering production experimental results provided in an embodiment of the present invention. Implementation Method

[0032] The following describes the implementation of the present invention using specific embodiments. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. Obviously, the embodiments described are only a portion of the present invention, not all of it. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0033] See also Figure 1 The experimental method for the stability of sintering production experimental results provided by the embodiment of the present invention includes the following steps:

[0034] S1. Pre-treatment of the drum mixer and drum granulator before the experiment: Place the production site mixture into the drum mixer, pour a specified amount of water into the storage tank of the drum mixer's atomizing water spray system, start the drum mixer to mix the raw materials, rotate the drum mixer forward and reverse for a specified period of time, and then open the discharge gate to discharge the mixture into the receiving hopper;

[0035] S2. Turn on the pouring button of the hopper to pour the mixed material into the cylindrical granulator; sequentially adjust the cylindrical granulator to a first set angle, a second set angle, and a third set angle in a horizontal direction, and rotate the cylindrical granulator at the set angles to fully wet the cylindrical granulator; after the cylindrical granulator is fully wetted, pour the mixed material into a barrel for storage;

[0036] S3. Pre-treat the sintering cup. When the raw material mixing operation of the first cup of the day reaches the specified time, start the cup drying program, ignite the igniter and move it to the top of the sintering cup to preheat the sintering cup. The drying time is 40s to 60s to ensure that the bottom temperature of the cup is 60℃ to 80℃ when the mixture is placed in the cup.

[0037] S4. Weigh the raw materials required for the sintering experiment on an electronic scale, pour the weighed raw materials into the drum mixer, calculate the water consumption based on the amount of raw materials, and pour the corresponding amount of water into the storage tank of the atomizing water spray system;

[0038] S5. Start the drum mixer to mix the raw materials. After the raw material mixing operation is completed, turn on the hopper operation button to pour the raw materials into the drum granulator;

[0039] S6. Start the drum granulator to perform the raw material granulation operation, which includes a first granulation and a second granulation. During the first granulation process, the drum granulator rotates in a horizontal state. During the second granulation process, the drum granulator rotates at a fourth set angle with the horizontal direction;

[0040] S7. Pour the granulated mixture into the sintering cup after weighing it through the transfer hopper. Flatten the mixture in the sintering cup and record the height of the material column. Turn on the exhaust fan to ignite the sintering. The entire sintering process is controlled by the sintering cup experiment control software.

[0041] Based on the above steps, the present invention designs the following embodiments. Example 1

[0042] Example 1 of the present invention provides an experimental method for improving the stability of sintering production experimental results: On August 3, 2023, a two-cup sintering cup experiment with the same ore blending structure was carried out. The experimental method of the two-cup experiment was consistent with the pre-pretreatment of steps S1, S2, and S3, and included the following steps:

[0043] Raw material ratio: iron-containing raw material ratio 60.58%, coke powder ratio 3.77%, dolomite powder ratio 5.16%, quicklime powder ratio 6.41%, return ore ratio 23.00%, dust ash ratio 1.08%. The total weight of raw materials used in this experiment is 52.53 kg.

[0044] First, precondition the drum mixer and drum granulator according to steps S1 and S2. Then, weigh the various raw materials and place them in the mixer according to step S4. Add 2730ml of water to the atomizing water system's storage tank. Then, start the drum mixer to mix the raw materials according to step S5, and then start the drum granulator to granulate the raw materials according to step S6. After the first cup of mixing in the drum mixer for 4 minutes, start the cup drying process according to step S3 to precondition the sintered cup. (The second cup does not require preconditioning because it is already wet after the first cup has been mixed thoroughly.)

[0045] The granulated mixture is weighed through a transfer hopper and poured into the sintering cup. The sintered material in the sintering cup is flattened and the height of the material column is recorded. Then the exhaust fan is turned on for ignition and sintering. The entire sintering process is automatically controlled by the sintering cup experimental control software. The main control process parameters of the sintering process are as follows: ignition temperature 1100℃, ignition time 90 seconds, pre-burning temperature 900℃, end judgment temperature reduction of 30℃, cooling end temperature 110℃, ignition negative pressure 8.0kPa, sintering negative pressure 12.0 kPa, and cooling negative pressure 7.0 kPa.

[0046] After the sintering process is completed, the sintered ore is poured out from the sintering cup, crushed, and then subjected to a drop test and screening test. The sintered ore of each particle size is then weighed and the sintered ore yield index is calculated. 7.5 kg of sintered ore with a particle size of 10-40 mm is weighed proportionally for drum index testing. The experimental evaluation indicators include vertical sintering speed, utilization coefficient, drum index, and yield, among which:

[0047] Vertical sintering speed = (material layer height - bottom material height) ÷ sintering time; vertical sintering speed unit is mm / min;

[0048] Utilization coefficient = (mass of finished ore - mass of base material) ÷ ​​(sintering area × sintering time); Utilization coefficient unit t / (m 2 h);

[0049] Finished product rate = (quality of finished ore - quality of base material) ÷ ​​(quality of sintered cake - quality of base material) × 100%;

[0050] Drum index = mass of sintered ore larger than 6.3 mm after drumming ÷ mass of sintered ore entering the drum × 100%.

[0051] The relevant indicator data are detailed in Table 1:

[0052] Table 1 Evaluation index table of parallel sintering experiment on August 3, 2023

[0053]

[0054] The drum index difference of the parallel experiments of the sintering cups in Example 1 is 0.53%, which meets the allowable difference in the drum index of parallel samples in the industry standard YBT 5166-1993 "Determination of drum strength of sintered ore and pellets" (ΔT≤1.4%). Example 2

[0055] Example 2 of the present invention provides an experimental method for improving the stability of sintering production experimental results: On September 14, 2023, a two-cup sintering cup experiment with the same ore blending structure was carried out. The experimental method of the two-cup experiment was consistent with the pre-pretreatment of steps S1, S2, and S3, and included the following steps:

[0056] Raw material ratio: iron-containing raw material ratio 61.41%, coke powder ratio 3.77%, dolomite powder ratio 4.70%, quicklime powder ratio 6.04%, return ore ratio 23.00%, dust removal ash ratio 1.08%. The total weight of raw materials used in this experiment is 53.64 kg.

[0057] First, precondition the drum mixer and drum granulator according to steps S1 and S2. Then, weigh the various raw materials and place them in the mixer according to step S4. Add 2230ml of water to the atomizing water system's storage tank. Then, start the drum mixer to mix the raw materials according to step S5, and then start the drum granulator to granulate the raw materials according to step S6. After the first cup of mixing in the drum mixer for 4 minutes, start the cup drying process according to step S3 to precondition the sintered cup. (The second cup does not require preconditioning because it is already wet after the first cup has been mixed thoroughly.)

[0058] The granulated mixture is weighed through a transfer hopper and poured into the sintering cup. The sintered material in the sintering cup is flattened and the height of the material column is recorded. Then the exhaust fan is turned on for ignition and sintering. The entire sintering process is automatically controlled by the sintering cup experimental control software. The main control process parameters of the sintering process are as follows: ignition temperature 1100℃, ignition time 90 seconds, pre-burning temperature 900℃, end judgment temperature reduction of 30℃, cooling end temperature 110℃, ignition negative pressure 8.0kPa, sintering negative pressure 12.0 kPa, and cooling negative pressure 7.0 kPa.

[0059] After the sintering process is completed, the sintered ore is poured out from the sintering cup, crushed, and tested for various indicators. The experiment is complete. The experimental evaluation indicators include vertical sintering speed, utilization coefficient, drum index, and yield rate (the indicator calculation formula is the same as in Example 1). The relevant indicator data are detailed in Table 2:

[0060] Table 2 Evaluation index table of parallel sintering experiments on September 14, 2023

[0061]

[0062] The drum index difference of the parallel experiments of the sintering cups in Example 2 is 0.80%, which meets the allowable difference in the drum index of parallel samples in the industry standard YBT 5166-1993 "Determination of drum strength of sintered ore and pellets" (ΔT≤1.4%). Example 3

[0063] Example 3 of the present invention provides an experimental method for improving the stability of sintering production experimental results: On November 29, 2023, a two-cup sintering cup experiment with the same ore blending structure was carried out. The experimental method of the two-cup experiment was consistent with the pre-pretreatment of steps S1, S2, and S3, and included the following steps:

[0064] Raw material ratio: iron-containing raw material ratio 61.62%, coke powder ratio 3.62%, dolomite ratio 4.00%, quicklime ratio 6.68%, return ore ratio 23.00%, dust ash ratio 1.08%. The total weight of raw materials used in this experiment is 52.81 kg.

[0065] First, precondition the drum mixer and drum granulator according to steps S1 and S2. Then, weigh the various raw materials and place them in the mixer according to step S4. Add 2900ml of water to the atomizing water storage tank. Then, start the drum mixer to mix the raw materials according to step S5, and then start the drum granulator to granulate the raw materials according to step S6. After the first cup of mixing in the drum mixer for 4 minutes, start the cup drying process according to step S3 to precondition the sintered cup. (The second cup does not require preconditioning because it is already wet after the first cup is mixed thoroughly.)

[0066] The granulated mixture is weighed through a transfer hopper and poured into the sintering cup. The sintered material in the sintering cup is flattened and the height of the material column is recorded. Then the exhaust fan is turned on for ignition and sintering. The entire sintering process is automatically controlled by the sintering cup experimental control software. The main control process parameters of the sintering process are as follows: ignition temperature 1100℃, ignition time 90 seconds, pre-burning temperature 900℃, end judgment temperature reduced by 30℃, cooling end temperature 120℃ (due to the significant drop in temperature in November, the cooling end temperature is increased by 10℃), ignition negative pressure 8.0kpa, sintering negative pressure 12.0 kpa, cooling negative pressure 7.0 kpa.

[0067] After the sintering process is completed, the sintered ore is poured out from the sintering cup, crushed, and tested for various indicators. The experiment is complete. The experimental evaluation indicators include vertical sintering speed, utilization coefficient, drum index, and yield rate (the indicator calculation formula is the same as in Example 1). The relevant indicator data are detailed in Table 3:

[0068] Table 3 Evaluation index table of parallel sintering experiments on November 2, 2023

[0069]

[0070] The drum index difference of the parallel experiments of the sintering cups in Example 3 is 0.26%, which meets the allowable difference in the drum index of parallel samples in the industry standard YBT 5166-1993 "Determination of drum strength of sintered ore and pellets" (ΔT≤1.4%).

[0071] In summary, the present invention performs pre-treatment on the drum mixer and the drum granulator before the experiment, puts the mixed material of the production site into the drum mixer, pours a specified amount of water into the storage tank of the atomizing water spraying system of the drum mixer, starts the drum mixer to perform the raw material mixing operation, and after the drum mixer rotates forward and reverse for a specified period of time, opens the discharge gate to discharge the mixed material into the receiving hopper; turns on the material discharge button of the receiving hopper to pour the mixed material into the drum granulator; adjusts the drum granulator to the first set angle, the second set angle, and the third set angle in the horizontal direction in sequence, rotates the drum granulator at the set angles to fully wet the drum granulator; when the wetting of the drum granulator is completed, pours the mixed material into the barrel for storage; performs pre-treatment on the sintering cup, and when the raw material mixing operation of the first cup experiment of each day reaches a specified period of time, starts the cup drying program, ignites the igniter, moves and rotates above the sintering cup to preheat the sintering cup, and the cup drying time The mixing time is 40s to 60s, ensuring that the temperature of the bottom of the cup is between 60℃ and 80℃ when the mixture is filled into the cup; weigh the raw materials required for the sintering experiment on an electronic scale, pour the weighed raw materials into the drum mixer, calculate the water consumption according to the amount of raw materials, and pour the corresponding amount of water into the storage tank of the atomizing water spraying system; start the drum mixer to mix the raw materials, and after the raw material mixing operation is completed, turn on the hopper operation button to pour the raw materials into the drum granulator; start the drum granulator to granulate the raw materials. The raw material granulation operation includes the first granulation and the second granulation. During the first granulation process, the drum granulator rotates in a horizontal state. During the second granulation process, the drum granulator rotates at a fourth set angle to the horizontal direction; the granulated mixture is weighed through the transfer hopper and poured into the sintering cup. After the mixture in the sintering cup is flattened, the height of the material column is recorded; turn on the exhaust fan to ignite sintering. The entire sintering process is controlled by the sintering cup experiment control software. The present invention can achieve the effects of uniform raw material mixing, high stability of sintering cup test results, and excellent control of the difference of parallel sintering cup experiments. The difference of the drum index of the parallel experiments meets the allowable difference of the drum index of parallel samples (ΔT≤1.4%) in the industry standard YBT 5166-1993 "Determination of the drum strength of sintered ore and pellets".

[0072] While the present invention has been described in detail above using general descriptions and specific examples, modifications and improvements based on the present invention are readily apparent to those skilled in the art. Therefore, modifications and improvements that do not depart from the spirit of the present invention, such as those requiring adjustments based on specific experimental conditions due to variations in the total amount of material in the sintering cup, mixing and pelletizing times, and various process parameters in the experimental steps, are intended to be within the scope of this invention.

Claims

1. An experimental method for improving the stability of sintering production experimental results, characterized in that: The following steps are involved: Before the experiment, the drum mixer and drum granulator were pre-treated. The mixed material from the production site was placed in the drum mixer. A specified amount of water was poured into the storage tank of the drum mixer's atomizing water spray system. The drum mixer was started to mix the raw materials. After the drum mixer rotated forward and reverse for a specified period of time, the discharge gate was opened to discharge the mixed material into the receiving hopper. Turn on the pouring button of the hopper to pour the mixed material into the cylindrical granulator; adjust the cylindrical granulator to the first set angle, the second set angle, and the third set angle in the horizontal direction in sequence, and rotate the cylindrical granulator at the set angles to fully wet the cylindrical granulator; after the cylindrical granulator is wetted, pour the mixed material into the barrel for storage; Carry out pre-treatment on the sintering cup. When the raw material mixing operation of the first cup of the day reaches the specified time, start the cup drying program, ignite the igniter and move it to the top of the sintering cup to preheat the sintering cup. The drying time is 40s to 60s to ensure that the temperature of the cup bottom is 60℃ to 80℃ when the mixed material is placed in the cup. Weigh the raw materials required for the sintering experiment on an electronic scale, pour the weighed raw materials into the drum mixer, calculate the water consumption based on the amount of raw materials, and pour the corresponding amount of water into the storage tank of the atomizing water spray system; Turn on the drum mixer to mix the raw materials. After the raw material mixing operation is completed, turn on the hopper operation button to pour the raw materials into the drum granulator; The drum granulator is started to perform a raw material granulation operation, and the raw material granulation operation includes a first granulation and a second granulation. During the first granulation process, the drum granulator rotates in a horizontal state. During the second granulation process, the drum granulator rotates at a fourth set angle with the horizontal direction; The granulated mixture is weighed through a transfer hopper and poured into the sintering cup. The mixture in the sintering cup is flattened and the height of the material column is recorded. The exhaust fan is turned on to ignite the sintering. The entire sintering process is controlled by the sintering cup experimental control software. The first set angle is 45°, the second set angle is 30°, and the third set angle is 15°. The cylindrical granulator is rotated at the set angle for at least 30 seconds to fully wet the cylindrical granulator. When the cylindrical granulator is rotated at the third set angle of 15°, the outer wall of the cylindrical granulator is struck 8 to 10 times with a rubber hammer; When the drum mixer is turned on to mix the raw materials, dry mixing is performed first. The drum mixer is turned on and rotated forward for 1 minute, then reversed for 30 seconds. Then, water is added while the drum mixer is rotating forward for 1 minute. After turning on the scraping device, the mixer is rotated forward for 30 seconds to loosen the sticky material on the drum wall. After reversing for 30 seconds, the discharge gate is opened to discharge the mixture into the receiving hopper. When the drum granulator is turned on to granulate the raw materials, the first granulation time is 3 minutes; The second granulation time is 3 minutes. During the second granulation process, the cylindrical granulator rotates at a fourth set angle of 30° with the horizontal direction; at the beginning of the second granulation, the outer wall of the cylindrical granulator is struck 8 to 10 times with a rubber hammer; The control process parameters during the sintering process are: ignition temperature 900℃~1100℃, ignition time 80s~120s, pre-burning temperature 800℃~1000℃, end judgment temperature is 10℃~60℃ lower than the highest point temperature, cooling end temperature 100℃~200℃, ignition negative pressure 5.0 kpa~10.0 kpa, sintering negative pressure 8.0 kpa~16.0 kpa, cooling negative pressure 5.0 kpa~10.0 kpa.

2. The experimental method for improving the stability of sintering production experimental results according to claim 1, characterized in that: Place 20 kg of the mixed material from the production site into the drum mixer, and pour 500 ml to 700 ml of water into the storage tank of the atomizing water spray system of the drum mixer.

3. The experimental method for improving the stability of sintering production experimental results according to claim 1, characterized in that: Also includes: After the sintering process is completed, the sintered ore is poured out from the sintering cup, and after crushing, the sintered ore drop test and screening test are carried out. After weighing the sintered ore of each particle size, the sintered ore yield index is calculated, and the sintered ore of 10mm to 40mm particle size is proportionally weighed to a specified weight for drum index detection.

4. The experimental method for improving the stability of sintering production experimental results according to claim 3, characterized in that: After the sintering process is completed, the sintered ore drop test is carried out using a drop strength testing machine, and the screening test is carried out using screening equipment.

5. The experimental method for improving the stability of sintering production experimental results according to claim 4, characterized in that: The evaluation indicators of sintering production experiment include vertical sintering speed, utilization coefficient, yield rate, and drum index. The indicator calculation formula is: Vertical sintering speed = (material layer height - bottom material height) ÷ sintering time; Utilization coefficient = (mass of finished ore - mass of base material) ÷ ​​(sintering area × sintering time); Finished product rate = (quality of finished ore - quality of base material) ÷ ​​(quality of sintered cake - quality of base material) × 100%; Drum index = mass of sintered ore with particle size greater than 6.3 mm after drumming ÷ mass of sintered ore entering the drum × 100%.

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