Belt type roasting machine system for ball cage test

Abstract

The utility model provides a belt type roasting machine system for a ball cage test. The belt type roasting machine system comprises a belt type roasting machine; the test cage is arranged on a trolley of the belt type roasting machine; an open hole and a movable cover plate covering the open hole are arranged on a sealing protective cover between a cooling section furnace cover and a tail rack of the belt type roasting machine; a test cage grabbing device is fixed on the tail rack; and the test cage grabbing device is positioned above the open hole. The utility model designs the belt type roasting machine process test system suitable for the actual production, the provided test research condition is more suitable for the actual production, and the obtained research data and recommended process system can be used as the basis for the design, production and operation of a belt type roasting machine pelletizing plant.

Description

TECHNICAL FIELD

[0001] The utility model belongs to a kind of belt roaster system for ball cage test and a method for belt roaster process test in the technical field of industrial design of belt roaster. BACKGROUND

[0002] Pellets have the advantages of uniform particle size, high cold strength, high iron grade and good reducibility, and are high-quality ironmaking raw materials. Whether it is a traditional blast furnace ironmaking process or a low-carbon green direct reduction ironmaking process, pellets are needed as production raw materials. The production process of pellets mainly uses chain grate-rotary kiln process and belt roaster process, among which the belt roaster process is widely used abroad and has been rapidly developing in China in recent years, with rapidly increasing production capacity.

[0003] The belt roaster pellet process is a production process that mixes and mixes various raw materials such as iron ore concentrate, binder and other additives (such as flux), and then feeds the green balls to the trolley, and the green balls move with the trolley to go through the blast drying section, the suction drying section, the preheating section, the roasting section, the soaking section and the cooling section to produce pellets with certain physicochemical properties and metallurgical properties.

[0004] Before the design and construction of a belt roaster pellet plant, or when the original design of a belt roaster pellet plant needs to be replaced, it is necessary to test the proposed raw material conditions to obtain recommended process parameters, which can serve as a basis for the design and production and operation of the belt roaster pellet plant. The current related pellet process test method has a large deviation in temperature change and duration, air condition compared with actual production process, so the test results are not sufficient as a reference for the design and production and operation of the belt roaster pellet plant.

[0005] There are two kinds of existing pellet test device and method, one is to make a small amount of raw material into a ball, dry it and then use a static roasting such as a tube furnace or a muffle furnace as a test device to conduct preheating roasting test research, in this kind of method, the pellets are only affected by temperature factors, and the amount of test raw material is very small, which is more used for theoretical and mechanism research of pellet preheating roasting, the second is that technicians increase the hot air from a certain source in the process of green ball drying and roasting on the basis of the first research device and method, this kind of device has many forms, but from the direction of hot air passing through the green ball, the type of hot air source, the simulation of the actual production temperature curve by the temperature of hot air, and the difference between small-scale test equipment and large-scale production equipment, it is difficult to truly realize the mass transfer and heat transfer process experienced by the green ball in the pellet process of the belt roaster, and it is also difficult to more realistically simulate the pellet production process of the belt roaster, the test data obtained through a large number of laboratory tests is naturally insufficient in reference for the design and production operation of the belt roaster pellet plant, and the design personnel and production operation personnel often need to make a large degree of correction according to the experience of the obtained test research data.

[0006] Therefore, how to find a more suitable belt roaster test system to solve the above problems existing in the existing belt roaster pellet test has become one of the problems to be solved by many first-line researchers in the field. Practical new type content

[0007] Therefore, the technical problem to be solved by the present application is to provide a belt roaster system for ball cage test. The present application provides a belt roaster process test system that is suitable for actual production, the test research conditions provided are more suitable for actual production, the research data and recommended process system obtained can be used as a basis for the design and production operation of the belt roaster pellet plant, and the test method is simple, controllable and accurate, and is more suitable for the popularization and application of industrial enterprises.

[0008] The present application provides a belt roaster system for ball cage test, comprising the following steps: comprising a belt roaster;

[0009] The test cage is arranged on the green ball conveying device (trolley) of the belt roaster;

[0010] The sealing shield between the cooling section cover of the belt roaster and the tail rack is provided with an opening and a movable cover plate covering the opening;

[0011] The test cage grabbing device is fixed on the tail rack;

[0012] The test cage grabbing device is located above the opening.

[0013] Preferably, the shape of the test cage includes a rectangular parallelepiped composed of metal strips;

[0014] The material of the metal includes heat-resistant alloy.

[0015] Preferably, the diameter of the metal strip is less than or equal to 6mm.

[0016] The gap of the metal strip is 6-8mm.

[0017] Preferably, the height of the test cage is 100-350mm.

[0018] The size of the opening is 600-1000mm.

[0019] Preferably, the ball cage test belt type roaster system further comprises an electric actuator and a manual control device.

[0020] Preferably, the electric actuator is associated with the movable cover plate for opening and closing the movable cover plate.

[0021] The manual control device is associated with the electric actuator for controlling the electric actuator.

[0022] Preferably, the test cage grabbing device comprises a fixed frame, a supporting moving part and a gripper.

[0023] Preferably, the test cage grabbing device is fixedly connected with the tail frame through the fixed frame.

[0024] The bottom of the supporting moving part is fixedly connected with the fixed frame.

[0025] Preferably, the supporting moving part comprises an electric actuator and a moving mechanism.

[0026] Preferably, the supporting moving part is connected with the gripper.

[0027] The electric actuator and the moving mechanism of the supporting moving part are used to realize the up-down displacement, left-right displacement and contraction and release of the gripper.

[0028] The utility model provides a kind of belt roaster system for ball cage test, comprising the following steps: including: belt roaster;Test cage is arranged on the green ball transport device of belt roaster;Open hole and movable cover plate covered on open hole are arranged on the sealing shield between the cooling section furnace cover of belt roaster and tail section rack;Test cage grabbing device is fixed on the tail section rack;Test cage grabbing device is located above open hole.Compared with prior art, the utility model is in need of early research data for the design and production operation of belt roaster pellet plant, and the drawbacks that existing device and method are relatively poor in actual production simulation, and a belt roaster process test system that is particularly designed to meet production practice is provided, the test research condition provided is more in line with production practice, and the research data and recommended process system obtained can be used as the basis for the design and production operation of belt roaster pellet plant.

[0029] The belt roaster process test system provided by the utility model is a process test system for cage test on a belt roaster.The utility model mixes and mixes raw materials in a certain proportion to form green balls, loads the formed green balls into test cage, and puts them into belt roaster, so that test cage and material layer of belt roaster pass through blast drying, suction drying, preheating, roasting, soaking and cooling process section in turn, and the speed of belt roaster, temperature and pressure of each detection point of furnace cover and air bellow, air volume of each process fan are recorded in the process, temperature and pressure curves of air bellow and furnace cover are drawn, and chemical analysis, physical property detection and metallurgical property detection are carried out after roasting pellets are taken out from tail section, so that pellet quality index and corresponding process system are obtained.

[0030] The process test system provided by the utility model can be directly carried out to obtain process system and finished product index, or laboratory simulation test of belt roaster can be carried out in the middle of green ball formation and belt roaster cage test, cage test on belt roaster is carried out after obtaining certain basic data, so that test workload is reduced, laboratory data is checked and corrected, and error caused by time difference of laboratory test and actual production air condition and temperature is reduced.Finally, more reasonable process system and pellet index basis can be provided for belt roaster pellet plant design and production operation.

[0031] The test system method of the belt roaster on-site cage test provided by the utility model can directly carry out cage test according to the existing belt roaster, has the characteristics of convenient and fast, simple and easy to operate, saving laboratory test cost and time; on the other hand, the hot air temperature, pressure, time and composition are the actual hot air of real production, and the hot air generated by the simulation test system cannot simulate the actual production. The temperature and air volume and air speed experienced by the sample are the temperature field and air condition of actual production, and the simulation degree of actual production is much higher than that of the laboratory simulation test equipment. The utility model can also be used as a test method combining laboratory simulation test and belt roaster on-site cage test, preliminary exploration test is carried out through the laboratory simulation test system, corresponding recommended process system and responsive pellet quality are obtained, then a small amount of verification cage test is carried out on the belt roaster on site, further checking and correction are carried out, so that the final belt roaster pellet recommended process system and responsive pellet quality are obtained, the precision and accuracy of the laboratory simulation test recommended result are improved, and more reasonable basis is provided for belt roaster pellet plant design and production operation. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 A schematic diagram of the belt roaster system for pellet cage test provided by the utility model is shown in the figure.

[0033] Figure 2 A partial schematic diagram of the belt roaster system for pellet cage test provided by the utility model is shown in the figure.

[0034] Figure 3 A partial top view schematic diagram of the belt roaster system for pellet cage test provided by the utility model is shown in the figure.

[0035] Figure 4 A partial sectional view schematic diagram of the belt roaster system for pellet cage test provided by the utility model is shown in the figure.

[0036] Figure 5 A structure schematic diagram of the test cage grabbing device provided by the utility model is shown in the figure.

[0037] Figure 6 A process flow schematic diagram of the belt roaster process test provided by the utility model is shown in the figure. DETAILED DESCRIPTION

[0038] In order to further understand the utility model, the preferred implementation scheme of the utility model is described below in combination with examples, but it should be understood that these descriptions are only for further illustrating the features and advantages of the utility model, and are not the limitation of the claims of the utility model.

[0039] All raw materials of the utility model have no special limitation on the source, and can be purchased on the market or prepared according to the conventional method familiar to those skilled in the art.

[0040] The raw material used in the utility model is not particularly limited in purity, and the utility model preferably has a conventional purity in the production field of industrial belt roasters.

[0041] The grade and abbreviation of all raw materials in the utility model belong to conventional grades and abbreviations in the field, and each grade and abbreviation is clear and explicit in the field of its related use, and the skilled person in the field can purchase or prepare by conventional methods according to the grade, abbreviation and corresponding use.

[0042] The abbreviation of all processes in the utility model belongs to conventional abbreviations in the field, and each abbreviation is clear and explicit in the field of its related use, and the skilled person in the field can understand the conventional process steps according to the abbreviation.

[0043] The utility model provides a kind of belt roaster system for ball cage test, comprising: belt roaster;

[0044] Test cage is arranged on the green ball transport device of belt roaster;

[0045] The sealing shield between the cooling section furnace cover of belt roaster and tail rack is provided with opening and movable cover plate covering on the opening;

[0046] Test cage grabbing device is fixed on the tail rack;

[0047] Test cage grabbing device is located above the opening.

[0048] In the utility model, the green ball transport device preferably includes trolley.

[0049] In the utility model, the shape of the test cage is preferably a cuboid composed of metal strips.

[0050] In the utility model, the material of the metal is preferably heat-resistant alloy.

[0051] In the utility model, the diameter of the metal strip is preferably less than or equal to 6mm, more preferably less than or equal to 5mm, and more preferably less than or equal to 4mm.

[0052] In the utility model, the gap of the metal strip is preferably 6-8mm, more preferably 6.4-7.6mm, and more preferably 6.8-7.2mm.

[0053] In the utility model, the height of the test cage can be determined according to needs within 100-350mm, preferably 300-350mm, and more preferably 300mm test cage.

[0054] In the utility model, the size of the opening is preferably 600-1000mm, more preferably 650-950mm, more preferably 700-900mm, and more preferably 750-850mm.

[0055] In the utility model, the ball cage test belt type baking machine system further preferably comprises an electric actuator and a manual control device.

[0056] In the utility model, the electric actuator is preferably associated with the movable cover plate and is used for realizing the opening and closing of the movable cover plate.

[0057] In the utility model, the manual control device is preferably associated with the electric actuator and is used for realizing the control of the electric actuator.

[0058] In the utility model, the test cage grabbing device preferably comprises a fixing frame, a supporting moving part and a gripper.

[0059] In the utility model, the test cage grabbing device is preferably fixedly connected with the tail rack through the fixing frame.

[0060] In the utility model, the bottom of the supporting moving part is preferably fixedly connected with the fixing frame.

[0061] In the utility model, the supporting moving part preferably comprises an electric actuator and a moving mechanism.

[0062] In the utility model, the supporting moving part is preferably connected with the gripper.

[0063] In the utility model, the electric actuator and the moving mechanism of the supporting moving part are preferably used for realizing the up-down displacement, left-right displacement of the gripper and the contraction and release of the gripper.

[0064] Referring to Figure 1 , Figure 1 The utility model provides a schematic diagram of the ball cage test belt type baking machine system. Among them, 1 is a test ball cage, 2 is a cage throwing point, 3 is a cage taking point, 4 is a trolley (green ball transport device), 5 is a cold section furnace cover, 6 is a tail rack, 7 is a supporting moving part.

[0065] Specifically, the ball cage test belt type baking machine system of the utility model is specifically:

[0066] The baking machine cage taking point and the test cage grabbing device are located behind the cooling section furnace cover and in front of the tail rack, as shown in Figure 2 .

[0067] Referring to Figure 2 , Figure 2The utility model provides a partial view schematic drawing of the belt type roaster system for ball cage test, wherein, 1 is the last end side wall of the cold section furnace cover, 2 is the roaster tail rack, 3 is the cage taking point, and 4 is the roaster center line.

[0068] The original sealing cover plate of the roaster needs to be holed here, and the holed size is suggested to be 600mm*1000mm (which can be adjusted in size according to the actual situation). The holed part is provided with a movable cover plate, which covers the hole in daily production and is opened to take the cage when sampling is needed.

[0069] The holed movable cover plate can be covered with a simple steel plate, and a slide is arranged between the original sealing cover plate and the holed movable cover plate here, and an electric actuator (motor) is arranged at the same time, which is fixed on the roaster tail rack and controls the holed movable cover plate to move towards the roaster center line and can also move to the opposite direction to reset, as shown in Figure 3 .

[0070] Referring to Figure 3 , Figure 3 The utility model provides a partial view schematic drawing of the belt type roaster system for ball cage test, wherein, 1 is the slide, 2 is the motor, and 3 is the roaster center line.

[0071] When the test cage is about to run to the cage taking point (preferably when the test cage enters the second cold section from the first cold section) along with the roaster, the electric actuator is automatically controlled to open the cover plate, and after the cage is taken, the electric actuator is automatically controlled to close the cover plate. The electric actuator is provided with a manual control box beside it for manual control.

[0072] Referring to Figure 4 , Figure 4 The utility model provides a partial view schematic drawing of the belt type roaster system for ball cage test, wherein, 1 is the last end furnace cover of the cold section, 2 is the roaster tail rack, 3 is the test cage grabbing device, and 4 is the cage taking point.

[0073] Referring to Figure 5 , Figure 5 The utility model provides a structure schematic drawing of the test cage grabbing device. Wherein, 1 is the fixed frame, 2 is the support moving piece, and 3 is the grab hand.

[0074] The automatic test cage grabbing device is arranged above the cage taking point, as shown in Figure 4 , which is fixed on the roaster tail rack and is composed of three parts, as shown in Figure 5 . Figure 5In the process, piece 1 is a fixed frame, which is fixedly connected with the tail frame of the roaster, and is used for supporting moving piece 2 and piece 3; piece 2 is an electric actuator, the bottom of which is welded (or bolted) with piece 1, one side of which is connected with piece 3, and which drives piece 3 to move; piece 3 is a gripper, which can perform two actions, one is up-down displacement, and the other is a gripper grabbing action. When not working, piece 3 is located at the upper position; when working, under the driving of piece 2, piece 3 firstly displaces downward, stops when the gripper is located at 30-50 mm above the material surface, and then the gripper shrinks to grab the test cage, and then piece 3 drives the test cage to move upward until fixed. After a signal is sent by the test personnel, the gripper is loosened, and the test personnel takes the test cage.

[0075] The utility model also provides a method for process test of the belt roaster, comprising the following steps:

[0076] 1) obtaining green balls and corresponding green ball indexes by raw material batching, mixing and balling and performing green ball performance detection;

[0077] 2) loading the green balls obtained in the above step into a test cage, then placing the test cage on a cage feeding point of the belt roaster, and then allowing the test cage to run with a trolley from the head of the belt roaster to the tail, and sequentially passing through blast drying, suction drying, preheating, roasting, soaking and cooling, and then taking out the test cage after the test cage runs with the trolley to a cage taking point;

[0078] During the above cage feeding test process, parameters of the belt roaster are recorded and a curve is drawn.

[0079] 3) performing analysis and detection on the roasted pellets in the test cage obtained in the above step, adjusting raw material ratio and process parameters according to the analysis and detection results of the roasted pellets, and then re-performing the test until the required pellet performance indexes are obtained, and meanwhile, corresponding process system parameters are obtained.

[0080] The utility model firstly obtains green balls and corresponding green ball indexes by raw material batching, mixing and balling and performing green ball performance detection.

[0081] The utility model then loads the green balls obtained in the above step into a test cage, then places the test cage on a cage feeding point of the belt roaster, and then allows the test cage to run with a trolley from the head of the belt roaster to the tail, and sequentially passes through blast drying, suction drying, preheating, roasting, soaking and cooling, and then takes out the test cage after the test cage runs with the trolley to a cage taking point.

[0082] During the above cage feeding test process, parameters of the belt roaster are recorded and a curve is drawn.

[0083] In the utility model, the shape of the test cage is preferably a cuboid composed of metal strips.

[0084] In the utility model, the diameter of the metal strip is preferably less than or equal to 6 mm, more preferably less than or equal to 5.5 mm, and more preferably less than or equal to 5 mm.

[0085] In the utility model, the gap of the metal strip is preferably 6-8 mm, more preferably 6.4-7.6 mm, and more preferably 6.8-7.2 mm.

[0086] In the utility model, the height of the test cage is in the range of 100-350 mm and can be determined according to the specific needs, preferably 300-350 mm, and more preferably 300 mm.

[0087] In the utility model, the specific way of putting in preferably comprises that a bedding material is arranged below the test cage, and the upper surface of the test cage is flush with the upper surface of the material layer of the trolley.

[0088] In the utility model, the parameters of the belt-type indurating machine preferably comprise the machine speed of the belt-type indurating machine, the temperature and pressure of each detection point of the furnace cover and the air bellow, and the air volume of each process fan.

[0089] In the utility model, the curve preferably comprises the temperature curve and / or pressure curve of the air bellow and the furnace cover, and more preferably the temperature curve or pressure curve of the air bellow and the furnace cover.

[0090] In the utility model, the drawing preferably comprises the following steps: combining the time, the real-time machine speed and the positions of the detection points, calculating the running position of the test cage, selecting the corresponding detection point according to the position of the test cage, and drawing the temperature curve and / or pressure curve corresponding to the position of the test cage.

[0091] The utility model finally analyzes and detects the indurated pellet in the test cage obtained through the above steps, adjusts the raw material ratio and the process parameters according to the analysis and detection results of the indurated pellet, re-performs the test until the required pellet performance index is obtained, and simultaneously obtains the corresponding process system parameters.

[0092] In the utility model, the analysis and detection preferably comprise chemical analysis, physical performance detection and metallurgical performance detection.

[0093] In the utility model, the method preferably comprises the following steps:

[0094] In the utility model, the method preferably further comprises the following step 4):

[0095] First, laboratory simulation test is performed to obtain the optimized raw material ratio and process system, and then the steps 1)-3) are adopted to perform the belt-type indurating machine field cage test, and the pellet quality index of the laboratory simulation test and the corresponding process system are checked and corrected.

[0096] In the utility model, the step 4) is specifically preferably:

[0097] 41) The pelletizing and green ball performance detection are carried out according to the method shown in the step 1);

[0098] 42) The pipe furnace roasting test is carried out in the laboratory, or the pipe furnace roasting and the roasting cup test of the simulation belt roaster are carried out, the optimized raw material ratio is obtained, and corresponding process system parameters are obtained;

[0099] 43) According to the optimized raw material ratio and process system parameters, the test and detection are carried out according to the steps 1) to 3);

[0100] 44) Based on the test and detection results obtained in the above steps, or by adjusting the process parameters, retesting, the pellet quality indexes and corresponding process systems of the laboratory simulation test are checked and corrected.

[0101] The utility model can directly carry out on-site cage feeding test on the belt roaster according to the belt roaster that has been built, obtain corresponding process system and pellet indexes, and can also combine the laboratory simulation test and the on-site cage feeding test of the belt roaster, check and correct the process system and pellet quality recommended by the laboratory simulation test through the on-site cage feeding test. In the cage feeding test provided by the utility model, the detection point data of the position where the test cage runs are selected in combination with the speed of the roaster and the positions of each detection point, the process curve is drawn, the data on the process curve completely correspond to the position of the material, and the real process system is reflected.

[0102] The utility model is a complete and detailed overall technical scheme, better guarantees the stability of the belt roaster process test system, and further improves the accuracy of the belt roaster process test. The system and method of the above belt roaster process test can specifically include the following contents:

[0103] Referring to Figure 6 , Figure 6 The utility model provides the process flow diagram of the belt roaster process test.

[0104] Referring to Figure 6 flow chart, the following is the specific implementation method of the utility model:

[0105] 1. In the laboratory, the ingredients are mixed and pelletized according to a certain ratio, and the green ball performance is detected, a certain number of green balls and corresponding green ball indexes are obtained.

[0106] 2. The green balls are loaded into the test cage.

[0107] The test cage is a cuboid shape, welded by heat-resistant alloy strips, the diameter of the alloy strips is less than 6 mm, and the gap is 6-8 mm. The height of the test cage is preferably 300-350 mm, and the length and width dimensions can be adjusted as needed.

[0108] 3. Put the test cage filled with green balls into the casting point position on the belt-type indurating machine.

[0109] The bottom of the test cage is a bed material, and the upper surface is flush with the upper surface of the charging layer on the trolley.

[0110] 4. The test cage runs with the trolley from the machine head to the tail, and sequentially passes through blast drying, suction drying, preheating, indurating, soaking, and cooling. The cage taking point position on the belt-type indurating machine is waited and observed in advance, and the test cage is taken out after the trolley runs to the cage taking point.

[0111] Specifically, during the test, the belt speed of the belt-type indurating machine, the temperature and pressure of each detection point of the furnace cover and the air box, and the air volume of each process fan are recorded, and the temperature and pressure curves of the air box and the furnace cover are drawn.

[0112] Specifically, the temperature and pressure curves of the air box and the furnace cover should be drawn in combination with the time, the real-time machine speed, and the positions of each monitoring point, the running position of the test cage is calculated, and the corresponding detection point is selected according to the position of the test cage.

[0113] For example:

[0114] 1# and 2# air boxes each have one temperature detection point, corresponding to positions of 0-6 m and 6-12 m on the belt-type indurating machine respectively. According to the test time and the real-time machine speed of the belt-type indurating machine, the real-time position of the test cage is calculated. When the test cage is at the position of 0-6 m, the temperature detection point of 1# air box is selected as the air box temperature. When the test cage runs to the position of 6 m, the air box temperature is switched to the temperature detection data of 2# air box. The subsequent is sequentially similar, until the test is completed, and the complete air box temperature curve corresponding to the position of the test cage is drawn.

[0115] 5. The indurated pellets obtained in the test cage are subjected to chemical analysis, physical property detection, and metallurgical property detection.

[0116] 6. According to the test results of the pellets, the raw material ratio and the process parameters are adjusted, and the test is re-performed until the required pellet performance indicators are obtained, and the recommended process system parameters are obtained.

[0117] Specifically, the foregoing belt-type indurating machine process test system method is a separate belt-type indurating machine on-site test. Alternatively, a laboratory simulation test can be performed first to obtain suitable raw material ratio and recommended process system, and then a belt-type indurating machine on-site test is performed to check and correct the pellet quality indicators and the corresponding process system of the laboratory simulation test.

[0118] The specific implementation method is as follows:

[0119] a. Balling and green ball performance detection are performed according to the method 1.

[0120] b. A pipe furnace roasting test is performed in a laboratory, or a pipe furnace roasting and a roasting cup test simulating a belt roaster are performed, to obtain a recommended raw material ratio and corresponding recommended process system parameters.

[0121] c. According to the recommended raw material ratio and process system parameters, tests and detections are performed according to the methods 1-6.

[0122] d. According to the test and detection results, the process parameters are adjusted, and the tests are re-performed to obtain recommended process system parameters and corresponding pellet performance indexes.

[0123] The system for the process test of the belt roaster provided by the above content of the utility model is a system for performing the process test by the cage test on the belt roaster. The utility model discloses a kind of process test systems, which is a system for performing process test by cage test on belt roaster. The utility model mixes after raw material is proportioned according to certain proportion, and the green ball made is loaded into test cage, is put into belt roaster, so that test cage and material layer of belt roaster pass through blast drying, suction drying, preheating, roasting, soaking and cooling process section in turn, record the temperature and pressure of each detection point of belt roaster, air volume of each process fan during the whole process, draw the temperature and pressure curve of air bellow and furnace cover, after the pellet after roasting is taken out at the tail of machine, chemical analysis, physical property detection and metallurgical performance detection are carried out, and pellet quality index and corresponding process system are obtained.

[0124] The process test method provided by the utility model can be directly performed to obtain process system and finished product index. The test of simulating belt roaster in laboratory can be performed between balling and cage test of belt roaster, and then the cage test on belt roaster is performed after obtaining certain basic data, so that the test workload is reduced, the laboratory data is checked and corrected, and the error caused by the difference between laboratory test and actual production air condition and temperature and time is reduced. Ultimately, more reasonable process system and pellet index basis can be provided for design and production and operation of belt roaster pellet plant.

[0125] The test system of the belt roaster on-site cage test provided by the utility model can directly carry out the cage test according to the existing belt roaster, has the characteristics of convenient and fast, simple and easy to operate, saving the laboratory test cost and time; on the other hand, the hot air temperature, pressure, time and composition are the actual hot air of the real production, and the hot air generated by the simulation test system cannot simulate the actual production. The temperature and air volume and air speed experienced by the sample are the temperature field and air condition of the actual production, and the simulation degree of the actual production is much higher than that of the laboratory simulation test equipment. The utility model can also be used as a test method combining the laboratory simulation test and the belt roaster on-site cage test, the preliminary exploration test is carried out through the laboratory simulation test system, the corresponding recommended process system and the responding pellet quality are obtained, then a small amount of verification cage test is carried out on the belt roaster on site, further checking and correction are carried out, so that the final belt roaster pellet recommended process system and the responding pellet quality are obtained, the precision and accuracy of the laboratory simulation test recommended result are improved, and more reasonable basis is provided for the belt roaster pellet plant design and production operation.

[0126] In order to further illustrate the utility model, the system of the belt roaster process test provided by the utility model is described in detail in combination with the embodiments below, but it should be understood that these embodiments are implemented on the premise of the technical scheme of the utility model, the detailed implementation mode and specific operation process are given, only for further illustrating the features and advantages of the utility model, and the protection scope of the utility model is not limited to the following embodiments.

[0127] Embodiment 1

[0128] 1) Pelletizing test

[0129] After mixing two kinds of iron ore concentrate, lime and binder, the green ball with the moisture of 11.51% is obtained under the pelletizing time of 10min, and the green ball performance is that the drop strength is 8.6 times / 0.5m, the compression strength is 13.85N / each, and the burst temperature is greater than 550 DEG C.

[0130] Referring to table 1, table 1 is the related parameter of the green ball in embodiment 1 of the utility model.

[0131] Table 1

[0132]

[0133] 2) Laboratory preheating and roasting test

[0134] The above green balls are subjected to laboratory tube furnace preheating roasting test, and under the conditions of preheating temperature 950 DEG C, preheating time 9 min, roasting temperature 1275 DEG C, roasting time 20 min, soaking temperature 950 DEG C, and soaking time 5 min, the roasting pellets with the compressive strength of 2614 N / piece can be obtained.

[0135] 3) Cage test

[0136] The total material layer thickness of the roasting machine is 400 mm, wherein the bottom material thickness is 100 mm

[0137] The total time of drying, preheating, roasting and cooling is about 39 min 20 s

[0138] The blast drying section: the lower air box temperature is 250 DEG C, and the time is 3 min 20 s

[0139] The exhaust drying section: the upper hood temperature is 290-310 DEG C, and the time is 4 min

[0140] The preheating section: the upper hood temperature is in a stepped increase, wherein the I section is 450-750 DEG C, and the time is 3 min; the II section is 750 DEG C-1000 DEG C, and the time is 3 min. The total preheating time is 6 min

[0141] The roasting section: the upper hood temperature is in a stepped increase, wherein the front section is 1150-1250 DEG C, and the time is 4.5 min; the rear end is 1240-1260 DEG C, and the time is 5.5 min. The total roasting time is 10 min

[0142] The soaking section: the upper hood temperature is 1050 DEG C, and the time is 2 min 20 s

[0143] The cooling section: the air blast cooling is adopted, and the cooling time is about 13 min 40 s in total.

[0144] The obtained pellets are detected, the compressive strength is 2516 N / piece, the drum strength is greater than 97%, the wear resistance index is less than 3%, the mechanical strength is excellent. The reduction degree of the pellets is 81.9%, the reduction expansion rate is 9.44%, which is lower than 10%, the low temperature reduction disintegration rate RDI +6.3mm is 99.53%, RDI -0.5mm is 0.39%, and the metallurgical performance is excellent.

[0145] Referring to Table 2, Table 2 is the mechanical strength of the pellet sample in the on-site cage test in the embodiment 1 of the utility model.

[0146] Table 2

[0147] Compressive strength N / P Drum strength / %, +6.3 mm Wear index / %, -0.5 mm 2516 97.41 2.41

[0148] Referring to Table 3, Table 3 is the metallurgical performance of the casted ball in Example 1 of the present application.

[0149] Table 3

[0150]

[0151] From the comparison of Table 3, the preheating roasting time is obviously shortened compared with the pipe furnace roasting experimental data, and the performance index of the obtained pellet is kept excellent. The laboratory pipe furnace roasting experiment only studies the change of the pellet under different temperature and time in the temperature field, without the action of hot air flow, therefore, the deviation of the result is larger, and it is more suitable for mechanism analysis rather than production analysis.

[0152] Example 2

[0153] 1) Balling test

[0154] Three kinds of iron ore concentrates are mixed according to a certain proportion, then 0.8% of bentonite and 3.95% of slaked lime are added, and the mixture is balling, the obtained green ball has a drop strength of 7 times / 0.5m, a compression strength of 17N / piece, and a burst temperature of greater than 400℃.

[0155] 2) Cage test 1

[0156] ■The total material layer thickness of the roasting machine is 450mm, wherein the bottom material thickness is 100mm

[0157] ■The total time of the whole machine speed is kept at about 2.8m / min, and the drying→preheating→roasting→cooling total time is about 45min

[0158] ■The blast drying section: the lower air box temperature is 290℃, and the time is 4.3min

[0159] ■The induced drying section: the upper hood temperature is 320-345℃, and the time is 4.3min

[0160] ■The preheating section: the upper hood temperature is in a stepped increase, wherein the I section is 510-700℃, and the time is 3.2min; the II section is 700℃-1070℃, and the time is 2.1min. The total preheating time is 5.3min

[0161] ■The roasting section: the upper hood temperature is in a stepped increase, wherein the front section is 1110-1220℃, and the time is 5.4min; the rear end is 1220-1260℃, and the time is 6.4min. The total roasting time is 11.8min

[0162] ■The soaking section: the upper hood temperature is 1030℃, and the time is 3.3min

[0163] ■Cooling section: cooling by blast, divided into one cooling section and two cooling sections, total cooling time about 16 min

[0164] The compressive strength of the roasted pellets is 1877 N / pellet.

[0165] 3) Cage test 2

[0166] The temperature of the roasting section is increased, the maximum temperature is 1275℃, and other thermal systems remain unchanged:

[0167] ■Roasting section: the temperature of the upper fume hood shows a stepwise increase, the front section is 1110-1225℃, time 5.4 min; the rear end is 1225-1275℃, time 6.4 min. The total roasting time is 11.8 min. The compressive strength of the roasted pellets is increased to 2639 N / pellet.

[0168] The metallurgical performance test shows that the reduction expansion rate is 32.4%, and the reduction degree is 64.37%.

[0169] 4) Cage test 3

[0170] The bentonite in the raw material is replaced with another new bentonite, and the addition amount remains unchanged. The cage test is carried out according to the thermal system of cage test 1.

[0171] The compressive strength of the roasted pellets is increased to 2532 N / pellet, the reduction expansion rate is 13.7%, and the reduction degree is 69.59%.

[0172] 5) Test conclusion

[0173] For the three kinds of iron ore concentrate and the raw material condition of the flux being calcium lime, the recommended production conditions of the test results are:

[0174] It is recommended to use new bentonite for production, and the addition amount is 0.8%.

[0175] The thermal system is recommended as follows:

[0176] ■The total material layer thickness of the roaster is 450 mm, of which the bottom material thickness is 100 mm

[0177] ■The total time of drying → preheating → roasting → cooling is about 45 min

[0178] ■Dry blast section: the lower air box temperature is 290℃, time 4.3 min

[0179] ■Dry blast section: the upper fume hood temperature is 320-345℃, time 4.3 min

[0180] ■Preheating section: the temperature of the upper hood is in a stepwise increase, wherein I section 510-700℃, time 3.2min; II section 700℃-1070℃, time 2.1min. The total preheating time is 5.3min

[0181] ■Roasting section: the temperature of the upper hood is in a stepwise increase, wherein the front section 1110-1220℃, time 5.4min; the rear end 1220-1260℃, time 6.4min. The total roasting time is 11.8min

[0182] ■Soaking section: the temperature of the upper hood is 1030℃, time 3.3min

[0183] ■Cooling section: the total cooling time is about 16min.

[0184] The system for process test of the belt roaster is described in detail above, and the principle and implementation mode of the present application are described by applying specific examples in this paper. The above description of the embodiments is only used to help understand the method of the present application and its core idea, including the best mode, and also enables any person skilled in the art to practice the present application, including manufacturing and using any device or system, and implementing any combined method. It should be noted that, for those skilled in the art, without departing from the principle of the present application, the present application can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the claims of the present application. The scope of the present application is limited by the claims, and can include other embodiments that can be thought of by those skilled in the art. If these other embodiments have structural elements that are not different from the textual description of the claims, or if they include equivalent structural elements that are not substantially different from the textual description of the claims, then these other embodiments should also be included in the scope of the claims.

Claims

1. A belt furnace system for ball cage testing, characterized by, The method comprises the following steps: comprising: a belt roaster; A test cage is arranged on a green ball conveying device of the belt roaster; An opening is arranged on a sealing shield between a cooling section furnace cover and a tail section frame of the belt roaster, and a movable cover plate covers the opening; A test cage grabbing device is fixed on the tail section frame; The test cage grabbing device is located above the opening.

2. The belt furnace system for ball cage testing according to claim 1, characterized in that The test cage is in the shape of a cuboid composed of metal strips; The metal is a heat-resistant alloy.

3. The belt furnace system for ball cage testing according to claim 2, characterized in that The diameter of the metal strip is less than or equal to 6 mm; The gap of the metal strip is 6-8 mm.

4. The ball cage test belt furnace system of claim 1, wherein, The height of the test cage is 100-350 mm; The size of the opening is 600-1000 mm.

5. The ball cage test belt furnace system of claim 1, wherein, The belt roaster system for the test cage further comprises an electric actuator and a manual control device.

6. The ball-lattice test belt furnace system of claim 5, wherein The electric actuator is associated with the movable cover plate and is used to open and close the movable cover plate; The manual control device is associated with the electric actuator and is used to control the electric actuator.

7. The ball cage test belt furnace system of claim 1, wherein The test cage grabbing device comprises a fixing frame, a supporting moving part and a gripper.

8. The ball-lattice test belt furnace system according to claim 7, characterized in that The test cage grabbing device is fixedly connected with the tail section frame through the fixing frame; The bottom of the supporting moving part is fixedly connected with the fixing frame.

9. The ball-lattice test belt furnace system of claim 7, wherein, The supporting moving part comprises an electric actuator and a moving mechanism.

10. The ball-lattice test belt furnace system of claim 9, wherein, The supporting moving part is connected with the gripper; The electric actuator and the moving mechanism of the supporting moving part are used to realize the up-down displacement, left-right displacement and contraction and release of the gripper.

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