Process for roasting manganese ores based on a sintering machine

Abstract

This invention discloses a process for roasting manganese ore based on a sintering machine. The process includes the following steps: S1, crushing and sorting the manganese ore; S2, conveying the manganese ore lumps to the bottom and edge material hopper of the bottom and edge material laying device; S3, feeding the sintering machine; S4, roasting: 1) drying in the drying section; 2) preheating section temperature of 750-900℃, preheating time of 6-8 min; 3) roasting section temperature of 1000-1200℃, roasting time of 18-22 min; 4) homogenization section temperature of 1000℃, homogenization time of 3-4 min; 5) cooling in the first cooling section for 4-6 min; S5, secondary cooling; S6, the finished manganese ore after secondary cooling enters the screening process. This invention rationally utilizes discarded or obsolete sintering machines to produce manganese ore, improving resource utilization, reducing the cost of manganese ore roasting equipment, saving investment, and achieving the goal of improving quality and increasing production.

Description

Technical Field

[0001] This invention relates to metallurgy, and in particular to a process for roasting manganese ore based on a sintering machine. Background Technology

[0002] Manganese has a wide range of uses and is a very important industrial raw material. In modern society, manganese and its compounds are increasingly used in metallurgy, chemical industry, light industry, medicine, machinery, defense, and agriculture. In non-ferrous metallurgy, manganese ore can be used as an oxidant in hydrometallurgical processes and as an alloying element.

[0003] Currently, the smelting of manganese alloys in China generally faces problems such as a wide variety of raw material sources, diverse types, and significant differences in composition. High-quality manganese lump ore is almost entirely dependent on imports. With increasing demand, the price of manganese lump ore continues to rise, and the supply of high-grade imported ore falls short of demand, resulting in high production costs for manganese alloys. Based on the production practice of smelting ferrosilicon manganese alloys in large-scale submerged arc furnaces, this paper proposes to reduce production costs and improve economic and technical indicators by increasing the proportion of high-basicity manganese carbonate ore and optimizing the batching process.

[0004] However, when manganese carbonate ore is directly added to the electric arc furnace, the carbonate minerals in the charge begin to decompose when the charge reaches 800 to 1000°C above the coke bed (molten pool). This decomposition inevitably leads to the ore cracking and pulverization, worsening the permeability of the charge and increasing the pressure inside the furnace. This disrupts the normal temperature gradient within the furnace, causing some of the charge to melt and become viscous in the clinker zone, turning the surface red. High-temperature gases escape from the melting point around the electrodes, causing sparks and slag spillage. In severe cases, the accumulation of large amounts of gas inside the furnace can lead to a "blowout" phenomenon.

[0005] In recent years, with the country's adjustments to environmental protection and steel production capacity, more and more sintering machines are facing obsolescence. Demolishing sintering plants and rebuilding manganese ore roasting plants would be costly and economically inefficient. Therefore, how to convert obsolete sintering machines into manganese ore production equipment has become a new research hotspot. Directly using sintering machines to produce manganese ore is also possible, but it requires crushing the manganese ore into powder, mixing it with binders, fuel, flux, etc., to form pellets for roasting. However, this presents several problems: 1. The manganese ore needs to be crushed to 200 mesh; 2. The raw materials are diverse, with varying properties and burn-off rates, resulting in deviations in the composition of the sintered ore, affecting the stability of the alloy composition and increasing the proportion of coke powder in the submerged arc furnace. Therefore, it is necessary to develop a new manganese ore roasting system based on existing sintering machines to solve these current problems. Summary of the Invention

[0006] The present invention aims to solve the above-mentioned technical problems, thereby providing a process for roasting manganese ore based on a sintering machine. This process utilizes an existing sintering machine to roast manganese ore, reducing equipment investment costs, improving resource utilization, and simultaneously reducing manganese ore sintering costs, thus saving investment.

[0007] The technical solution adopted by this invention to solve its technical problem is as follows: A process for roasting manganese ore based on a sintering machine includes the following steps: S1. Manganese ore crushing and sorting Select manganese ore lumps and pelletize manganese ore powder; S2. Manganese ore lumps are transported to the bottom and edge material bins of the bottom and edge material laying device, and manganese ore balls are transported to the manganese ore pellet bins of the material spreading device. S3, Sintering Machine Fabric Manganese ore blocks are laid on the sintering machine trolley as the base and edge material, and manganese ore balls are laid on the manganese ore blocks. S4, roasting As the trolley moves, manganese ore lumps and ore balls pass sequentially through the drying section, preheating section, roasting section, homogenization section, and initial cooling section. 1) Drying is carried out in the drying section; 2) The temperature of the preheating section is 750 to 900℃, and the preheating time is 6-8 minutes; 3) The temperature of the roasting section is 1000 to 1200℃, and the roasting time is 18-22 minutes; 4) The temperature of the heat spreader is 1000℃, and the heat spread time is 3-4 minutes; 5) The cooling time for the first cold section is 4-6 minutes; S5, Secondary Cooling After roasting, the manganese ore enters a cooler and is cooled for 15-20 minutes. The temperature after cooling is less than or equal to 100℃. S6. The finished manganese ore after secondary cooling enters the screening process.

[0008] Compared with the prior art, the present invention, which adopts the above technical solution, has the following beneficial effects: 1. By using bottom and edge materials of appropriate particle size and developing a new manganese ore roasting system using existing obsolete sintering machines, a new system is developed. This system makes reasonable use of obsolete or obsolete sintering machines to produce manganese ore, thereby improving resource utilization. At the same time, it reduces the cost of manganese ore roasting equipment, saves investment, and achieves the goal of improving quality and increasing production. 2. After roasting, the moisture in the manganese ore is removed, and the high-valence oxides of the manganese ore are decomposed into low-valence oxides under high temperature conditions of 800-1100℃, which improves the grade of the ore entering the furnace, reduces the carbon dioxide in the electric furnace, increases the CO content in the furnace, and improves the calorific value of the electric furnace gas, which is beneficial for the subsequent use of the gas. 3. Installing a cooling section at the end of the sintering machine can effectively protect the tail hopper of the sintering machine and extend the service life of subsequent equipment; 4. Versatile roasting process, suitable for roasting manganese lumps, manganese pellets, or a combination of both.

[0009] Furthermore, the optimized solution of the present invention is: The sintering machine is a belt sintering machine.

[0010] The drying section includes a forced-air drying section I and a forced-air drying section II. The temperature of forced-air drying section I is 350 to 450°C and the drying time is 2 to 3 minutes. The temperature of forced-air drying section II is 600°C and the drying time is 2 to 3 minutes.

[0011] The drying section includes a forced-air drying section and a forced-air drying section. The temperature of the forced-air drying section is 400 to 500°C and the drying time is 2 to 3 minutes. The temperature of the forced-air drying section is 600°C and the drying time is 2 to 3 minutes.

[0012] The cooler is a vertical cooler.

[0013] The feed temperature of the cooler is 450-550℃.

[0014] The manganese ore pellets have a particle size of 8-16 mm, and the manganese ore lumps have a particle size of 10-20 mm.

[0015] The cooling air duct of the cooler is connected to the air outlet of the cooling fan, and the hot air of the cooler is connected to the combustion air duct of the burner of the sintering machine through the vertical cooling dust collector, the hot combustion fan and the preheating pipe.

[0016] The roasting section is equipped with a reheating fan for regulating the temperature of the reheating air, and the inlet of the reheating fan is equipped with a cold air regulating valve.

[0017] Burners are respectively installed on the hot air hoods at corresponding positions in the preheating section and the calcination section. Gas supply pipes and second combustion air pipes of the burners are respectively equipped with gas regulating valves and combustion air regulating valves. Attached Figure Description

[0018] Figure 1 This is a perspective view of the calcination system of the sintering machine according to Embodiment 1 of the present invention; Figure 2 This is a diagram of the hot air system of the sintering machine in Embodiment 1 of the present invention; Figure 3 This is a perspective view of the bottom and edge laying device and the fabric laying device according to Embodiment 1 of the present invention; Figure 4 This is a front view of the bottom and edge laying device and the fabric laying device of Embodiment 1 of the present invention; Figure 5 This is a perspective view of the sintering system of the sintering machine according to Embodiment 2 of the present invention; Figure 6 This is a diagram of the hot air system of the sintering machine in Embodiment 2 of the present invention.

[0019] In the diagram: 1. Sintering machine; 2. Bottom and edge material laying device; 3. Material feeding device; 4. Burner; 4-1. Natural gas pipeline; 4-2. Mixed gas pipeline; 5. Tail chute; 6. Combustion fan F01; 7. Preheating combustion fan F02; 8. Vertical cooling fan F03. Cooling fan F04 for the first cooling section; Regenerating fan F05; Main dust removal fan F06; Vertical cooler 6; Vertical cooling dust collector C01; Environmental ultra-low dust collector C02; Desulfurization and denitrification device 7; Chimney 8; Fume hood 9; Manganese ore pellet silo 11; Bottom and edge silo 12; First electro-hydraulic gate valve 13; Second electro-hydraulic gate valve 14; Manganese ore feeding chute 15; Edge chute 16; Bottom chute 17; Blow-drying section I G01; Blow-drying section II G02; Preheating section Y01; Roasting section P01; Soaking section J01; First cooling section L01; First main flue YD1; Sintering main flue YD2; Blow-drying section I regulating valve G01K; Blow-drying section II regulating valve G02K; Exhaust drying section C02; Exhaust drying section Air inlet pipe C01J; First exhaust regulating valve CFK; Second exhaust regulating valve CFJ; Preheating section regulating valve Y01K; Calcination section regulating valve P01K; Gas regulating valve GK2; Combustion air regulating valve ZK2; Calcination make-up air regulating valve LK1; Combustion make-up air regulating valve LK2; Gas transmission pipeline GS1; Preheating and combustion air pipeline ZR1; Combustion air pipeline ZR2; Blow-drying section I outlet pipe G01C; Blow-drying section I inlet pipe G01J; Blow-drying section II inlet pipe G02J; Blow-drying section II outlet pipe G02C; Preheating section outlet pipe Y01C; Calcination section outlet pipe P01C; Cooling section I inlet pipe L01J; Cooling air pipeline L02J; Outlet pipe L02C. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0021] Example 1 (see Figures 1-4 ) S1. Manganese ore crushing and sorting Rhodochrosite lumps are selected for crushing to obtain manganese ore lumps with a particle size of 10-20 mm. The manganese ore powder is then pelletized to form manganese ore pellets with a particle size of 8-16 mm. S2. Manganese ore lumps are conveyed to the bottom and edge material silo 12 of the bottom and edge material laying device 2, while manganese ore pellets are conveyed to the manganese ore pellet silo 11 of the material spreading device 3. The manganese ore lumps for bottom and edge laying come from the finished product grading station and are transported to the bottom and edge material silo 12 by a conveyor belt. The bottom and edge material silo 12 is equipped with a pressure head weighing level gauge to control the start and stop of the bottom material conveyor belt. The bottom and edge material silo 12 has four discharge ports. Two bottom material ports are equipped with a first electro-hydraulic gate valve 13, and two edge material ports are equipped with a second electro-hydraulic gate valve 14. The bottom material chute 17 uses a fan-shaped automatic adjustment valve to control the thickness of the bottom material. The height of the edge material is adjusted by adjusting the height of the baffle on the side of the edge material chute 16. Manganese ore pellets come from the raw material system and are conveyed to the manganese ore pellet silo 11 by a conveyor belt. The manganese ore pellet silo 11 is equipped with a weighing level gauge to control the start and stop of the manganese ore raw material conveyor belt. The manganese ore feeding chute 15 uses lifting and automatic adjusting valves to control the thickness of the manganese ore layer. The bottom and edge material laying device 2 and the material spreading device 3 are located at the head of the sintering machine 1, and the tail of the sintering machine 1 is equipped with a vertical cooler 6. The sintering machine 1 is divided into the following sections along the running direction of the trolley: blow-drying section I G01, blow-drying section II G02, preheating section Y01, calcining section P01, homogenizing section J01, and first cooling section L01. Each of the blow-drying section I G01, blow-drying section II G02, preheating section Y01, calcining section P01, homogenizing section J01, and first cooling section L01 is equipped with a fume hood 9. Both the preheating section Y01 and the calcination section P01 are equipped with burners 4. The gas inlets of burners 4 are connected to natural gas pipeline 4-1 and mixed gas pipeline 4-2 respectively through gas transmission pipeline GS1. Combustion air for burners 4 is supplied by combustion air blower F01 and combustion air pipeline ZR2. Burners 4 are controlled by ignition devices (not shown in the figure) installed on the hot air hoods of preheating section Y01 and calcination section P01. The cooling air pipeline L02J of vertical cooler 6 is connected to the air outlet of cooling blower F03. The hot air of vertical cooler 6 enters vertical cooling dust collector C01 through air outlet pipeline L02C. After dust removal by vertical cooling dust collector C01, it is pressurized by preheating combustion air blower F02 and connected to combustion air pipeline ZR2 of burner 4 through preheating combustion air pipeline ZR1. Combustion air supply pipe and combustion air supply regulating valve LK2 are installed at the outlet of hot combustion air blower F02. The first cooling section L01 of the sintering machine 1 is connected to the air inlet duct L01J of the cooling section I, and the air inlet duct L01J of the cooling section I is connected to the air outlet of the cooling fan F04 of the first cooling section. The hot air from the first cooling section L01 near the tail of the sintering machine 1 enters the homogenizing section J01 and the calcining section P01 through the fume hood 9 above the sintering machine 1. Each air box below the calcining section P01 and the homogenizing section J01 is connected to the calcining section air outlet duct P01C through its own air box branch pipe. Each of the multiple air box branch pipes is equipped with a calcining section regulating valve P01K. The calcining section air outlet duct P01C is pressurized by the regenerating fan F05 and then connected to the first main flue YD1. The inlet of the regenerating fan F05 is equipped with a cold air regulating valve, which is used to regulate the temperature of the regenerating air. The inlet of the regenerating fan F05 is also equipped with a calcining makeup air regulating valve LK1. The first main flue YDl is connected to the air inlet at the bottom of the blower drying section G01 through the air inlet pipe G01J of the blower drying section I. The first main flue YDl is connected to the air inlet at the bottom of the blower drying section G02 through the air inlet pipe G02J of the blower drying section II. The blower drying section I regulating valve G01K and the blower drying section II regulating valve G02K are respectively installed on the blower drying section I regulating valve G01K and the blower drying section II regulating valve G02K. A wind box is installed at the bottom of the sintering machine 1, and the outlet of the wind box is connected to the main flue YD2 of the sintering machine via a pipe. Each wind box below the preheating section Y01 is connected to the preheating section outlet pipe Y01C through its own wind box branch pipe, and each wind box branch pipe is equipped with a preheating section regulating valve Y01K. The outlet pipes G01C of the blower drying section I, G01C of the blower drying section II, and Y01C of the preheating section are all connected to the main flue YD2 of the sintering machine. The main flue YD2 of the sintering machine is connected to the ultra-low dust collector CO2 through a pipe. The ultra-low dust collector CO2 is connected to the main dust collector fan F06. The main dust collector fan F06 is connected to the desulfurization and denitrification device 7. The desulfurization and denitrification device 7 is connected to the chimney 8. The qualified flue gas is discharged from chimney 8.

[0022] S3, Sintering Machine Fabric Manganese ore lumps are evenly laid on the sintering machine 1 trolley, and manganese ore pellets are evenly laid on the manganese ore lumps. The material distribution structure not only improves the air permeability of the material layer, but also reduces the temperature of the high-temperature flue gas when it passes through the material layer and reaches the grate bars and side plates of the sintering machine trolley, thus protecting the sintering machine trolley and avoiding high-temperature damage. This means that a sintering machine with lower temperature resistance is used to produce manganese ore. S4, roasting As the trolley moves, manganese ore lumps and ore balls sequentially pass through the following stages: blower drying section I (G01), blower drying section II (G02), preheating section Y01, roasting section P01, homogenization section J01, and initial cooling section L01. 1) Drying in the drying section (a) Blower drying stage I G01 The drying section G01 of the blower-drying unit uses a drying airflow of 350℃ to 450℃ to remove the attached water from the manganese ore pellets and prevent the lower material layer from becoming too wet. The hot airflow used in the drying section G01 of the blower-drying unit comes from the roasting section P01 and the soaking section J01. The hot airflow is sent to the drying section G01 of the blower-drying unit through the regenerating fan F05 and the pipeline system. Cold and hot air regulating valves are installed on the regenerating air pipeline to control the hot air temperature between 350℃ and 450℃. The exhaust gas after the material layer is dried is filtered by the ultra-low dust collector CO2 and then discharged into the atmosphere through the main dust collector fan F06 and the chimney 8. The drying time is 2-3 minutes. (b) Blower drying stage II G02 The blower drying section II G02 uses hot waste gas recovered from the wind box of the roasting section P01 and the homogenization section J01. The hot air is introduced into the blower drying section II G02 by the regenerating blower F05 to dry the material layer, so that the manganese ore is dehydrated and dried. It can withstand the temperature of more than 600℃ in the preheating section and the drying time is 2-3 minutes. 2) Preheating section Y01 The main process function of the preheating section Y01 is to heat and raise the temperature, so that the chemical water and carbonates in the manganese ore are decomposed and oxidized. The main heat source is the combustion system on the preheating section Y01 of the sintering machine. The combustion system is equipped with a gas regulating valve GK2 and a combustion air regulating valve ZK2 to control the temperature of the preheating section at 750℃-900℃, so that the manganese ore is preheated and has a certain strength. The preheating time is 6-8 minutes. 3) Calcination section P01 The preheated manganese ore enters the roasting section P01, where it undergoes a roasting atmosphere of 1000℃ to 1200℃ generated by the heat supplied by burner 4, and is hardened and solidified. The combustion air required for combustion in burner 4 consists of primary ambient air supplied by combustion fan F01 and preheated combustion air from vertical cooler 6. After roasting, the manganese ore reaches the required strength, and the roasting time is 18-22 minutes. 4) Heat Spreading Section J01 After the roasted manganese ore layer enters the homogenization section J01, the manganese ore layer is continuously homogenized by the heat exchange air with a temperature greater than 1000℃ in the fume hood 9 on the cold section L01 under the ventilation treatment, so that the manganese ore at different heights of the layer is kept in a uniform temperature state. The homogenization time is 3-4 minutes. 5), I cold section A vertical cooling fan F03 is used to introduce ambient air into the air box and penetrate the manganese ore layer to cool and exchange the high-temperature manganese ore after roasting. After heat exchange, the hot air at about 1000°C is sent to the heat soaking section J01, roasting section P01 and preheating section Y01 through the fume hood 9 and pipes respectively. The cooling time is 4-6 minutes. S5, Secondary Cooling After roasting, the manganese ore enters the tail hopper from the discharge port of sintering machine 1. The tail hopper is located at the discharge end of the sintering machine. The tail hopper enters the vertical cooler 6 through the tail chute 5. The feed temperature of the vertical cooler 6 is 450℃-550℃, and the cooling time is 15-20 minutes. The temperature of the cooled manganese ore is less than or equal to 100℃. After heat exchange, the hot air at a temperature of about 300℃ is transported from the outlet duct L02C through the vertical cooling dust collector C01, the preheating combustion fan F02, and the pipeline system to the roasting section P01 and the preheating section Y01 combustion system for secondary combustion air. A cold air regulating valve is installed on the pipeline to control the temperature of the combustion air.

[0023] S6. The finished manganese ore after secondary cooling enters the screening process.

[0024] Example 2 (see Figure 5 , Figure 6 ) The sintering machine 1, bottom and edge material laying device 2, material spreading device 3, vertical cooler 6, desulfurization and denitrification device 7, and chimney 8 in Example 2 have the same structure as in Example 1.

[0025] S1. Manganese ore crushing and sorting Rhodochrosite lumps are selected for crushing to obtain manganese ore lumps with a particle size of 10-20 mm. The manganese ore powder is then pelletized to form manganese ore pellets with a particle size of 8-16 mm. S2. Manganese ore lumps are transported to the bottom and edge material bin 12 of the bottom and edge material device 2, and manganese ore pellets are transported to the manganese ore pellet bin 11 of the material distribution device 3. S3, Sintering Machine Fabric Manganese ore lumps are evenly laid on the sintering machine 1 trolley, and manganese ore pellets are evenly laid on the manganese ore lumps. The material distribution structure not only improves the air permeability of the material layer, but also reduces the temperature of the high-temperature flue gas when it passes through the material layer and reaches the grate bars and side plates of the sintering machine trolley, thus protecting the sintering machine trolley and avoiding high-temperature damage. This means that a sintering machine with lower temperature resistance is used to produce manganese ore. S4, roasting As the trolley moves, manganese ore lumps and ore balls sequentially pass through the forced-air drying section G01, the exhaust drying section CO2, the preheating section Y01, the roasting section P01, the homogenizing section J01, and the first cooling section L01. 1) Drying in the drying section (a) Blower drying section G01 The drying section G01 of the blower-drying unit uses a drying airflow of 350℃ to 450℃ to remove the attached water from the manganese ore pellets and prevent the lower material layer from becoming too wet. The hot airflow used in the drying section G01 of the blower-drying unit comes from the roasting section P01 and the soaking section J01. The hot airflow is sent to the drying section G01 of the blower-drying unit through the regenerating fan F05 and the pipeline system. Cold and hot air regulating valves are installed on the regenerating air pipeline to control the hot air temperature between 350℃ and 450℃. The exhaust gas after the material layer is dried is filtered by the ultra-low dust collector CO2 and then discharged into the atmosphere through the main dust collector fan F06 and the chimney 8. The drying time is 2-3 minutes. (b) CO2 in the exhaust drying section The exhaust drying section C02 uses the hot waste gas recovered from the air box in the roasting section P01. It is introduced into the fume hood of the exhaust drying section C02 through the regenerating fan F05, the first large flue YDl and the exhaust drying section air inlet pipe C01J to dry the material layer from top to bottom, so as to dehydrate and dry the manganese ore. It can withstand the temperature of over 600℃ in the preheating section. The drying time is 2-3 minutes. The exhaust drying section air inlet pipe C01J is equipped with the first exhaust regulating valve CFK and the second exhaust regulating valve CFJ. 2) Preheating section Y01 The main process function of the preheating section Y01 is to heat and raise the temperature, so that the chemical water and carbonates in the manganese ore are decomposed and oxidized. The main heat source is the combustion system on the preheating section Y01 of the sintering machine. The combustion system is equipped with a gas regulating valve GK2 and a combustion air regulating valve ZK2 to control the temperature of the preheating section at 750℃-900℃, so that the manganese ore is preheated and has a certain strength. The preheating time is 6-8 minutes. 3) Calcination section P01 The preheated manganese ore enters the roasting section P01, where it undergoes a roasting atmosphere of 1000℃ to 1200℃ generated by the heat supplied by burner 4, and is hardened and solidified. The combustion air required for combustion in burner 4 consists of primary ambient air supplied by combustion fan F01 and preheated combustion air from vertical cooler 6. After roasting, the manganese ore reaches the required strength, and the roasting time is 18-22 minutes. 4) Heat Spreading Section J01 After the roasted manganese ore layer enters the homogenization section J01, the manganese ore layer is continuously homogenized by the heat exchange air with a temperature greater than 1000℃ in the fume hood 9 on the cold section L01 under the ventilation treatment, so that the manganese ore at different heights of the layer is kept in a uniform temperature state. The homogenization time is 3-4 minutes. 5), I cold section A vertical cooling fan F03 is used to introduce ambient air into the air box and penetrate the manganese ore layer to cool and exchange the high-temperature manganese ore after roasting. After heat exchange, the hot air at about 1000°C is sent to the heat soaking section J01, roasting section P01 and preheating section Y01 through the fume hood 9 and pipes respectively. The cooling time is 4-6 minutes. S5, Secondary Cooling After roasting, the manganese ore enters the vertical cooler 6 from the tail end of the sintering machine 1 through the tail chute 5. The feed temperature of the cooler is 450℃-550℃, the cooling time is 12-15 minutes, and the temperature after cooling is less than or equal to 100℃. After heat exchange, the hot air at a temperature of about 300℃ is transported from the outlet duct L02C through the vertical cooling dust collector C01, the preheating combustion fan F02, and the pipeline system to the roasting section P01 and the preheating section Y01 combustion system for secondary combustion air use. A cold air regulating valve is installed on the pipeline to control the temperature of the combustion air.

[0026] S6. The finished manganese ore after secondary cooling enters the screening process.

[0027] This invention enables the entire roasting and cooling air system to have only one inlet and one outlet, reducing emission points. Furthermore, the recycling of air improves heat utilization, reduces energy consumption, enhances efficiency, and minimizes environmental pollution. In addition, air regulating valves are installed on each air box branch pipe, combustion air pipe, gas pipe, and forced-air drying pipe, allowing for real-time adjustment of flue gas or gas volume. Cold air regulating valves are also installed on the regenerating air pipe and preheating combustion air pipe to regulate flue gas temperature and volume, thereby improving the yield of manganese ore.

[0028] After roasting, the overall burn loss of manganese ore lumps is 28.1%, and the bursting index of manganese ore lumps is 2.83%. The analysis results show that the process of the present invention can remove the rebar crystallization water and decompose more than 99% of the carbonates, ensuring that the electric arc furnace can operate stably after the manganese ore or manganese ore pellets are put into the furnace (see the chemical composition analysis table of manganese ore for each indicator).

[0029] Before roasting 20.84 1.41 19.97 6.84 7.72 4.03 0.75 0.38 0.32 7.89 0.05 After roasting 31.56 2.40 26.94 7.31 8.92 4.91 0.75 0.53 0.28 0.09 0.06 The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. All equivalent structural changes made based on the description and drawings of the present invention are included within the scope of the present invention.

Claims

1. A process for roasting manganese ore based on a sintering machine, comprising the following steps: S1. Manganese ore crushing and sorting Select manganese ore lumps and pelletize manganese ore powder; S2. Manganese ore lumps are transported to the bottom and edge material bins of the bottom and edge material laying device, and manganese ore balls are transported to the manganese ore pellet bins of the material spreading device. S3, Sintering Machine Fabric Manganese ore blocks are laid on the sintering machine trolley as the base and edge material, and manganese ore balls are laid on the manganese ore blocks. S4, roasting As the trolley moves, manganese ore lumps and ore balls pass sequentially through the drying section, preheating section, roasting section, homogenization section, and initial cooling section. 1) Drying is carried out in the drying section; The drying section includes a forced-air drying section I and a forced-air drying section II. The temperature of forced-air drying section I is 350 to 450°C and the drying time is 2 to 3 minutes. The temperature of forced-air drying section II is 600°C and the drying time is 2 to 3 minutes. The drying section includes a forced-air drying section and a forced-air drying section. The temperature of the forced-air drying section is 400 to 500°C and the drying time is 2 to 3 minutes. The temperature of the forced-air drying section is 600°C and the drying time is 2 to 3 minutes. 2) The temperature of the preheating section is 750 to 900℃, and the preheating time is 6-8 minutes; 3) The temperature of the roasting section is 1000 to 1200℃, and the roasting time is 18-22 minutes; 4) The temperature of the heat spreader is 1000℃, and the heat spread time is 3-4 minutes; 5) The cooling time for the first cold section is 4-6 minutes; S5, Secondary Cooling After roasting, the manganese ore enters a cooler and is cooled for 15-20 minutes. The temperature after cooling is less than or equal to 100℃. S6. The finished manganese ore after secondary cooling enters the screening process.

2. The process for roasting manganese ore based on a sintering machine according to claim 1, characterized in that: The sintering machine is a belt sintering machine.

3. The process for roasting manganese ore based on a sintering machine according to claim 1, characterized in that: The cooler is a vertical cooler.

4. The process for roasting manganese ore based on a sintering machine according to claim 1, characterized in that: The feed temperature of the cooler is 450-550℃.

5. The process for roasting manganese ore based on a sintering machine according to claim 1, characterized in that: The manganese ore pellets have a particle size of 8-16 mm, and the manganese ore lumps have a particle size of 10-20 mm.

6. The process for roasting manganese ore based on a sintering machine according to claim 1, characterized in that: The cooling air duct of the cooler is connected to the air outlet of the cooling fan, and the hot air of the cooler is connected to the combustion air duct of the burner of the sintering machine through the dust collector, the hot combustion fan and the preheating pipe.

7. The process for roasting manganese ore based on a sintering machine according to claim 1, characterized in that: The roasting section is equipped with a reheating fan for regulating the temperature of the reheating air, and the inlet of the reheating fan is equipped with a cold air regulating valve.

8. The process for roasting manganese ore based on a sintering machine according to claim 1, characterized in that: Burners are respectively installed on the hot air hoods at corresponding positions in the preheating section and the calcination section. Gas supply pipes and second combustion air pipes of the burners are respectively equipped with gas regulating valves and combustion air regulating valves.

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