A composite roasting kiln and a roasting method

Abstract

The present invention discloses a composite roasting kiln and a roasting method. The composite roasting kiln includes a preheating furnace, a roasting kiln, a hot blast stove and a heat preservation and cooling device; the preheating furnace includes an ore ball feeding cart, an ore ball inlet, a dried ore ball discharger, a preheated ore ball discharger and a roasting flue gas buffer chamber. The ore ball feeding cart is located directly in front of the ore ball inlet. The ore ball inlet is arranged at the upper part of the preheating furnace and is communicated with the ore ball feeding cart and the dried ore ball discharger. The preheated ore ball discharger is located at the lower part of the preheating furnace and directly below the dried ore ball discharger; the roasting kiln includes a roasted ore ball feeder, and the roasted ore ball feeder is communicated with the preheated ore ball discharger and is used for feeding the preheated ore balls into the roasting rotary drum through the roasted ore ball feeder. A high-temperature oxygen-enriched hot air inlet and a roasting rotary drum discharge port are arranged on the roasting rotary drum, and the high-temperature oxygen-enriched hot air inlet and the roasting rotary drum discharge port are respectively communicated with the hot blast stove and the heat preservation and cooling device.

Description

Technical Field

[0001] The present invention relates to the metallurgical technology field of non-ferrous metal ores such as stone coal vanadium ore and lithium ore, and particularly to a composite roasting kiln and a roasting method. Background Art

[0002] With the country implementing the green and low-carbon development strategy and promoting the implementation of the goals of "carbon peak and carbon neutrality", the market demand for new energy and new materials has increased significantly, and new productive forces such as new energy vehicles and wind and solar power installations have developed rapidly. Non-ferrous metals such as vanadium and lithium and their compounds are widely used in industries such as metallurgy, aerospace, chemical engineering, and new batteries. The annual demand for vanadium will reach 4 million tons during the 14th Five-Year Plan period, which is 4 times the current annual vanadium production in the country; the annual demand for lithium and non-ferrous metals is also growing rapidly. Developing mineral resources such as stone coal type vanadium ore, lepidolite ore, and non-ferrous metal ore has great economic and social significance.

[0003] Most of the stone coal type vanadium ores contain about 15% carbon. In the existing vanadium extraction technology for stone coal type vanadium ores, the carbon content in the stone coal type vanadium ore is first removed, and then vanadium is extracted from the stone coal vanadium ore slag after burning loss. The solution is to build a dedicated decarbonization furnace to burn off the carbon content in the stone coal type vanadium ore and use it as a vanadium extraction raw material. In the vanadium extraction roasting process, an external heat source (coal, natural gas, etc.) is used to roast the stone coal vanadium ore balls. In this way, the heat of the stone coal type vanadium ore is not fully utilized, the energy consumption is increased during the roasting process, and the local temperature will reach above 900 °C during the decarbonization and burning loss process of the stone coal type vanadium ore, resulting in part of the vanadium being wrapped in the melted quartz. The wrapped vanadium is difficult to effectively extract in the subsequent vanadium extraction process, which not only increases the production cost but also wastes resources.

[0004] The smelting of non-ferrous metal ores such as lepidolite has high energy consumption and low comprehensive metal recovery rate; reducing the energy consumption of non-ferrous metal smelting and improving the comprehensive recovery rate of non-ferrous metal ores are the inevitable requirements for implementing the national policy of "energy conservation and emission reduction". Summary of the Invention

[0005] The purpose of the present invention is to provide a composite roasting kiln to reduce the energy consumption and emissions of smelting non-ferrous metals such as vanadium and lithium and improve the comprehensive recovery rate of resources.

[0006] To achieve the above object, the present invention provides a composite roasting kiln, which includes a preheating furnace, a roasting kiln, a hot blast stove, a heat preservation and cooling device, and a roasting control system; wherein, the preheating furnace includes a ore ball feeding vehicle, an ore ball inlet, a dried ore ball discharger, a preheated ore ball discharger, and a roasting flue gas buffer chamber. The ore ball feeding vehicle is located directly in front of the ore ball inlet. The ore ball inlet is arranged at the upper part of the preheating furnace and is communicated with the ore ball feeding vehicle and the dried ore ball discharger. The ore ball feeding vehicle enters the preheating furnace through the ore ball inlet and sends the vanadium ore balls onto the dried ore ball discharger. The dried ore ball discharger is located in the middle of the preheating furnace and below the ore ball inlet. The preheated ore ball discharger is located at the lower part of the preheating furnace and directly below the dried ore ball discharger. The roasting flue gas buffer chamber is located at the bottom of the preheating furnace. The roasting kiln includes a roasted ore ball feeder, which is communicated with the preheated ore ball discharger and is used to send the preheated ore balls into the roasting rotary drum through the roasted ore ball feeder. A high-temperature oxygen-enriched hot air inlet and a roasting rotary drum discharge port are arranged on the roasting rotary drum. The high-temperature oxygen-enriched hot air inlet and the roasting rotary drum discharge port are respectively communicated with the hot blast stove and the heat preservation and cooling device.

[0007] In a preferred embodiment, the preheating furnace further includes a flue gas purifier, a flue gas distributor, a flue gas induced draft fan, a preheating and roasting controller, and a first equipment platform. The flue gas purifier is located on the side of the preheating furnace. The flue gas induced draft fan is installed on the external platform at the top of the preheating furnace. The inlet of the flue gas induced draft fan is communicated with the flue gas distributor, and the outlet of the flue gas induced draft fan is communicated with the flue gas purifier. The flue gas purifier is located on the first equipment platform. The roasting flue gas buffer chamber is communicated with the flue gas induced draft fan.

[0008] In a preferred embodiment, the roasting kiln includes a roasting rotary drum flue gas outlet, a roasting rotary drum feed inlet, a first roasting rotary drum base, a roasting rotary drum power source, a second roasting rotary drum base, and a second equipment platform. The roasting rotary drum is in the shape of an oblong tube and is longitudinally installed in an inclined manner on the first roasting rotary drum base and the second roasting rotary drum base, where the first roasting rotary drum base is higher than the second roasting rotary drum base. The roasting rotary drum feed inlet is arranged at one end of the roasting rotary drum close to the preheating furnace. The feed end of the roasted ore ball feeder is located below the preheated ore ball discharger in the roasting flue gas buffer chamber. The discharge end of the roasted ore ball feeder is located inside the roasting rotary drum feed inlet and communicates with the preheated ore ball discharger. The roasting rotary drum flue gas outlet is at the same end as the roasting rotary drum feed inlet and communicates with the roasting flue gas buffer chamber at the bottom of the preheating furnace. The first roasting rotary drum base and the second roasting rotary drum base are located on the second equipment platform and are respectively at positions close to both ends directly below the roasting rotary drum. The roasting rotary drum power source is located on the second equipment platform and is arranged at a position close to the middle of the roasting rotary drum. The roasting rotary drum is provided with a high-temperature oxygen-enriched hot air inlet and a roasting rotary drum discharge outlet. The roasting rotary drum discharge outlet is arranged at one end of the roasting rotary drum close to the hot blast stove and is connected to the heat preservation tower of the heat preservation and cooling device. The high-temperature oxygen-enriched hot air inlet and the roasting rotary drum discharge outlet are at the same end of the roasting rotary drum and are connected to the high-temperature hot air outlet of the hot blast stove and the outlet of the oxygen-enriched air blower.

[0009] In a preferred embodiment, the hot blast stove includes a fuel conveyor, a hot blast blower, a hot blast buffer chamber, a fly ash collection trough of the hot blast buffer chamber, a combustion furnace, a high-temperature hot blast outlet, an oxygen-enriched air blower, and an industrial oxygen generator. The fuel conveyor is arranged on one side of the hot blast stove and is communicated with the combustion furnace of the hot blast stove. The inlet of the hot blast blower is connected to the hot blast buffer chamber, and the outlet of the hot blast blower is connected to the air inlet of the combustion furnace. The hot blast buffer chamber is arranged on the other side of the hot blast stove. The hot blast inlet of the hot blast buffer chamber is communicated with the hot blast outlet channel of the cooling cylinder of the heat preservation and cooling device. The hot blast buffer chamber is provided with a fly ash collection trough of the hot blast buffer chamber. The combustion furnace is arranged at the center of the hot blast stove. The high-temperature hot blast outlet of the combustion furnace is arranged at the upper part of the rear of the hot blast stove and is communicated with the high-temperature oxygen-enriched hot blast inlet of the roasting rotary drum. The inlet of the oxygen-enriched air blower is connected to the outlet of the industrial oxygen generator. The oxygen-enriched air blower and the industrial oxygen generator are both arranged on the second equipment platform and are located on the other side corresponding to the discharging end of the roasting rotary drum and the cooling cylinder. The outlet of the oxygen-enriched air blower is connected to the high-temperature oxygen-enriched hot blast inlet. The hot blast stove further includes a fly ash collection trough of the hot blast stove, a slag discharger, a hot blast stove operation room, a hot blast stove controller, and a third equipment platform. The slag discharger is arranged below the combustion furnace and is communicated with the slag discharge port of the combustion furnace, the fly ash collection trough of the hot blast buffer chamber, and the fly ash collection trough of the hot blast stove. The hot blast stove operation room is arranged on the third equipment platform in front of the hot blast stove. The hot blast stove controller is located in the hot blast stove operation room. The third equipment platform is located at the lower side of the second equipment platform, and the first equipment platform is located above the second equipment platform.

[0010] In a preferred embodiment, the heat preservation and cooling device includes a heat preservation tower, a cooling water coil, a cooled ore ball discharger, a cooled ore ball elevator, a hot blast outlet channel of the cooling cylinder, a cooling cylinder feed inlet, a cooling cylinder, a cooling cylinder discharge outlet, and a cooling blower. The foundation of the heat preservation tower is located on the third equipment platform, is arranged below the discharging outlet of the roasting rotary drum, and is communicated with the discharging outlet of the roasting rotary drum. The cooling water coil is arranged below the cooled ore ball discharger and above the cooled ore ball elevator. The water inlet of the cooling water coil is communicated with a normal temperature water source, and the water outlet is communicated with a hot water storage tank. The cooled ore ball discharger is arranged at the lower part of the heat preservation tower and is connected to the feed inlet of the cooled ore ball elevator. The cooled ore ball elevator is arranged at the bottom of the heat preservation tower. The discharging outlet of the cooled ore ball elevator is connected to the cooling cylinder feed inlet. The cooling cylinder is a rectangular cylinder and is installed longitudinally in an inclined shape. Its foundation is established on the second equipment platform. The air inlet end of the cooling cylinder is connected to the cooling blower, and the hot blast outlet end passes through the hot blast outlet channel at the upper part of the heat preservation tower and is connected to the hot blast buffer chamber of the hot blast stove. The cooled ore ball conveyor is arranged in the cooling cylinder. The feed end of the cooled ore ball conveyor is connected to the cooling cylinder feed inlet, and the discharging end is connected to the cooling cylinder discharge outlet. The cooling cylinder discharge outlet is arranged at the lower half of the cooling cylinder at the air inlet end.

[0011] In a preferred embodiment, the heat preservation and cooling device further includes a first cooling cylinder base, a cooled ore ball conveyor, a second cooling cylinder base, a cooling air diverter, an operation room of the heat preservation and cooling device, and a controller of the heat preservation and cooling device. The first cooling cylinder base and the second cooling cylinder base are respectively arranged on the second equipment platform directly below the cooling cylinder. The second cooling cylinder base is higher than the first cooling cylinder base. The cooling blower is arranged at the air inlet end of the cooling cylinder. The outlet of the cooling blower is connected to the upper half of the cooling cylinder to send normal temperature air into the cooling cylinder. The cooling air diverter is arranged in the cooling cylinder and installed in the space formed between the upper wall of the cooling cylinder and above the cooled ore ball conveyor. The operation room of the heat preservation and cooling device is arranged on the second equipment platform on the side of the cooling cylinder close to the preheating furnace. The controller of the heat preservation and cooling device is arranged in the operation room of the heat preservation and cooling device.

[0012] In a preferred embodiment, it further includes a roasting control system. The roasting control system includes a main control room, which is arranged on the first equipment platform on the side of the preheating furnace close to the feeding port of the roasting rotary cylinder. A main controller, a monitoring detector, a main operation console, and a preheating and roasting controller are arranged in the main control room. The main controller, the monitoring detector, and the main operation console are connected to the controllers of each sub-system and the control point sensors through control lines or Ethernet signals. The preheating and roasting controller is arranged in the main control room on the other side of the preheating furnace opposite to the flue gas purifier on the first equipment platform.

[0013] The present invention also provides a method for oxidizing and roasting stone coal type vanadium ore by using the above-mentioned composite roasting kiln, including the following steps:

[0014] Step 1: Connect the power supplies of the main control room, the hot blast stove operation room, and the operation room of the heat preservation and cooling device, detect that the entire roasting control system is in a normal working state, and start the initial operation mode of the main controller;

[0015] Step 2: Start the ore ball feeding vehicle to convey vanadium ore balls to the preheating furnace. When the ore balls on the dry ore ball discharger of the preheating furnace reach the specified upper height limit, automatically shut down the ore ball feeding vehicle;

[0016] Step 3: Start the fuel conveyor to supply stone coal vanadium ore powder to the hot blast stove, control the feeding amount, automatically start the hot blast blower of the hot blast stove, ignite the stone coal vanadium ore powder in the hot blast stove. The stone coal vanadium ore powder in the hot blast stove continues to burn, and the burning hot air continuously flows into the roasting kiln through the high-temperature oxygen-enriched hot air inlet. After the burned slag and fly ash accumulate to the specified material level, automatically start the ash discharge machine, and automatically stop the machine after discharging the ash and slag;

[0017] Step 4: When the flue gas temperature in the roasting flue gas buffer chamber of the preheating furnace reaches 600 °C, successively and automatically start the flue gas induced draft fan, the flue gas purifier, the roasting rotary cylinder, the oxygen-enriched air blower, and the industrial oxygen generator of the preheating furnace;

[0018] Step 5: When the temperature of the ore balls on the dried ore ball discharger reaches 450 °C, automatically start the dried ore ball discharger to discharge the dried ore balls onto the preheated ore ball discharger. When the height of the ore balls on the dried ore ball discharger is at the lower limit of the specified height, the dried ore ball discharger is closed, and the ore ball feeder is started to supplement the vanadium ore balls to reach the upper limit of the specified height on the dried ore ball discharger;

[0019] Step 6: After the ore balls on the preheated ore ball discharger reach the upper limit of the specified height, automatically start the preheated ore ball discharger to discharge the preheated ore balls into the roasted ore ball feeder of the roasting kiln. When the height of the ore balls on the preheated ore ball discharger reaches the lower limit of the specified height, the preheated ore ball discharger is closed;

[0020] Step 7: The roasted ore ball feeder automatically and continuously conveys the preheated ore balls to the roasting rotary drum. The preheated ore balls entering the roasting rotary drum move towards the hot blast stove with the rotation of the roasting rotary drum, and convect with the high-temperature oxygen-rich hot air sent by the hot blast stove and the oxygen-enriched air blower into the roasting rotary drum, adsorb heat, and perform oxidative roasting. After the oxidative roasting process is completed, the roasted ore balls move to the discharge port of the roasting rotary drum and are conveyed to the heat preservation tower of the heat preservation and cooling device;

[0021] Step 8: When the ore balls on the cooling ore ball discharger of the heat preservation tower reach the upper limit of the specified height, automatically start the cooling water coil and automatically start the cooling ore ball discharger to discharge the ore balls onto the cooling ore ball elevator. When the discharged cooling ore balls reach the lower limit of the specified height, the cooling ore ball discharger is closed;

[0022] Step 9: Automatically start the cooling ore ball elevator, the cooling blower, and the cooling ore ball conveyor. The cooling ore ball elevator feeds the ore balls into the cooling ore ball conveyor through the cooling cylinder feed port. The cooling ore ball conveyor carries the ore balls and moves towards the discharge port of the cooling cylinder, convectively exchanges heat with the normal-temperature air sent by the cooling blower. The ore balls in the cooling ore ball conveyor are cooled and move to the discharge port of the cooling cylinder and are discharged to the leaching process. The vanadium ore oxidative roasting process ends, and the composite roasting kiln completes the initial startup mode and transfers to the normal operation mode.

[0023] The present invention also provides a roasting method for non-ferrous metal ores using the above composite roasting kiln, including the following steps:

[0024] Step 1: Connect the power supplies of the general control room, the hot blast stove operation room, and the heat preservation and cooling device operation room, detect that all the roasting control systems are in normal working conditions, and start the initial operation mode of the general controller;

[0025] Step 2: Start the ore ball feeder to convey non-ferrous metal ore balls to the preheating furnace. The non-ferrous metal ores include lithium ore, rubidium ore, cesium ore, molybdenum ore, silver ore, and nickel ore. When the ore balls on the dried ore ball discharger of the preheating furnace reach the upper limit of the specified height, the ore ball feeder is automatically closed;

[0026] Step 3: Start the fuel feeder to supply pulverized coal or natural gas to the hot blast stove, control the feeding amount, automatically start the hot blast blower of the hot blast stove, ignite the pulverized coal or natural gas in the hot blast stove, and the pulverized coal or natural gas in the hot blast stove continues to burn. The burned hot air continuously flows into the roasting kiln through the high-temperature oxygen-enriched hot air inlet. After the burned slag and fly ash accumulate to the specified level, automatically start the ash discharge machine, and automatically stop after clearing the ash and slag;

[0027] Step 4: When the flue gas temperature in the roasting flue gas buffer chamber of the preheating furnace reaches ℃, successively and automatically start the flue gas induced draft fan, flue gas purifier, roasting rotary drum, oxygen-enriched air blower, and industrial oxygen generator of the preheating furnace;

[0028] Step 5: When the temperature of the ore balls on the drying ore ball discharger reaches ℃, automatically start the drying ore ball discharger to unload the dried ore balls onto the preheating ore ball discharger. When the height of the ore balls on the drying ore ball discharger is at the lower limit of the specified height, the drying ore ball discharger is closed, and the ore ball feeding vehicle is started to supplement the non-ferrous metal ore balls to reach the upper limit of the specified height on the drying ore ball discharger;

[0029] Step 6: After the ore balls on the preheating ore ball discharger reach the upper limit of the specified height, automatically start the preheating ore ball discharger to unload the preheated ore balls into the roasting ore ball feeder of the roasting kiln. When the height of the ore balls on the preheating ore ball discharger reaches the lower limit of the specified height, the preheating ore ball discharger is closed;

[0030] Step 7: The roasting ore ball feeder automatically and continuously conveys the preheated ore balls to the roasting rotary drum. The preheated ore balls entering the roasting rotary drum move towards the hot blast stove direction as the roasting rotary drum rotates, and convect with the high-temperature oxygen-enriched hot air sent by the hot blast stove and the oxygen-enriched air blower into the roasting rotary drum, adsorb heat, and perform oxidative roasting. After the oxidative roasting process is completed, the roasted ore balls move to the discharge port of the roasting rotary drum and are conveyed to the heat preservation tower of the heat preservation and cooling device;

[0031] Step 8: When the ore balls on the cooling ore ball discharger of the heat preservation tower reach the upper limit of the specified height, automatically start the cooling water coil, automatically start the cooling ore ball discharger to unload the ore balls onto the cooling ore ball elevator. When the ore balls are unloaded to the lower limit of the specified height, close the cooling ore ball discharger;

[0032] Step 9: Automatically start the cooling ore ball elevator, cooling blower, and cooling ore ball conveyor. The cooling ore ball elevator feeds the ore balls into the cooling ore ball conveyor through the cooling cylinder feed port. The cooling ore ball conveyor carries the ore balls and moves towards the cooling cylinder discharge port direction, convectively exchanges heat with the normal-temperature air sent by the cooling blower. The ore balls in the cooling ore ball conveyor are cooled and move to the cooling cylinder discharge port and are unloaded to the leaching process. The roasting process of the non-ferrous metal ore balls ends, and the composite roasting kiln completes the initial startup mode and transfers to the normal operation mode.

[0033] Compared with the prior art, the present invention has the following advantages:

[0034] According to the different requirements of process conditions in the preheating, roasting, heat preservation, and cooling stages of the ore ball roasting process, the composite roasting kiln of the present invention respectively adopts devices with different structures such as a preheating furnace (drying and preheating), a hot blast stove + rotary kiln (high-temperature roasting), a heat preservation tower (heat preservation), and a cooling cylinder (cooling). While making full use of heat, it maximally meets the corresponding process conditions in different stages of the ore ball roasting process, reducing energy consumption by 20% and increasing the comprehensive resource recovery rate by more than 10%.

[0035] When the present invention is applied to roasting stone coal type vanadium ore, the stone coal vanadium ore can be used as fuel to burn in the hearth of the hot blast stove, and the high-temperature hot air generated is sent into the roasting kiln. The carbon content in the fly ash and slag after combustion is reduced to less than 2%, which can be used as raw material for vanadium extraction. This not only solves the problem that the original stone coal type vanadium ore needs to be decarbonized first and then vanadium is extracted, but also meets the high-temperature oxidation roasting temperature of the roasting kiln without external heat source. In this way, the energy consumption for roasting vanadium ore balls is saved, the comprehensive utilization of stone coal vanadium ore is realized, and the resource utilization rate is improved. Calculated based on the production of vanadium pentoxide from stone coal vanadium ore, 8 - 10 tons of standard coal can be saved per ton of vanadium pentoxide produced.

[0036] When the present invention is applied to non-ferrous metal smelting, it can significantly reduce the roasting flue gas emission temperature and the leaching temperature of roasted ore balls, which can not only reduce energy consumption and emissions, but also increase the comprehensive resource recovery rate. When using the present invention to roast non-ferrous metal ores such as stone coal vanadium ore and lithium, the roasting flue gas can be completely collected in an organized manner, and after purification, it meets the emission standards, solving the problem of environmental pollution caused by the unorganized emission of some flue gas in the existing roasting kilns for stone coal vanadium ore, lithium and other non-ferrous metal ores.

[0037] When using the present invention to roast non-ferrous metal ores such as stone coal type vanadium ore and lithium, the production process of the construction project is short, the floor area is small, and for construction projects with the same production scale, the project investment is reduced by 20% compared with traditional roasting furnaces and kilns, and the economic benefits of the enterprise are good. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a front elevation sectional view schematic diagram of a composite roasting kiln according to an embodiment of the present invention;

[0039] Figure 2 is a top view schematic diagram of a composite roasting kiln according to an embodiment of the present invention.

[0040] Description of the reference numerals:

[0041] Preheating furnace, 11. Flue gas purifier, 12. Flue gas distributor, 13. Flue gas induced draft fan, 14. Ore ball feeding vehicle, 15. Ore ball inlet, 16. Dry ore ball discharger, 17. Preheated ore ball discharger, 18. Roasting flue gas buffer chamber, 19. Preheating roasting controller, 110. First equipment platform;

[0042] Roasting kiln, 21. Roasted ore ball feeder, 22. Roasting rotary drum flue gas outlet, 23. Roasting rotary drum feed inlet, 24. Roasting rotary drum, 25. First roasting rotary drum base, 26. Roasting rotary drum power, 27. Second roasting rotary drum base, 28. High-temperature oxygen-enriched hot air inlet, 29. Roasting rotary drum discharge outlet, 210. Second equipment platform;

[0043] Hot blast stove, 31. Fuel conveyor, 32. Hot air blower, 33. Hot air buffer chamber, 34. Fly ash collecting tank of hot air buffer chamber, 35. Combustion furnace hearth, 36. High-temperature hot air outlet, 37. Oxygen-enriched air blower, 38. Industrial oxygen generator, 39. Fly ash collecting tank of hot blast stove, 310 Ash slag discharger, 311. Hot blast stove operation room, 312. Hot blast stove controller, 313. Third equipment platform;

[0044] 4. Heat preservation and cooling device, 41. Heat preservation tower, 42. Cooling water coil, 43. Cooled ore ball discharger, 44. Cooled ore ball elevator, 45. Cooling drum hot air outlet channel, 46. Cooling drum feed inlet, 47. Cooling drum, 48. First cooling drum base, 49. Cooled ore ball conveyor, 410. Second cooling drum base, 411. Cooling drum discharge outlet, 412. Cooling blower, 413. Cooling air diverter, 414. Heat preservation and cooling device operation room, 415. Heat preservation and cooling device controller.

[0045] 5. Roasting control system, 51. General control room, 52. General controller, 53. Monitoring monitor, 54. General operation console. Detailed implementation manners

[0046] The following combines the accompanying drawings to describe in detail the specific implementation manners of the present invention, but it should be understood that the protection scope of the present invention is not limited by the specific implementation manners.

[0047] Unless otherwise clearly stated, in the whole specification and claims, the term "comprising" or its variations such as "including" or "including having" etc. will be understood to include the stated elements or components, without excluding other elements or other components. Embodiment

[0048] As Figures 1 to 2 shown, the composite roasting kiln of this embodiment includes a preheating furnace 1, a roasting kiln 2, a hot blast stove 3, a heat preservation and cooling device 4, and a roasting control system 5.

[0049] In this embodiment, calcined stone coal type vanadium ore is taken as an example. The vanadium ore balls enter the preheating furnace 1 through the ore ball inlet 15 at the upper part of the preheating furnace 1, and are in countercurrent with the hot flue gas (650 °C) flowing into the roasting flue gas buffer chamber 18 at the bottom of the preheating furnace from the high-temperature oxygen-rich hot air inlet 28. After being dried and preheated, they enter the roasting kiln 2. The roasting flue gas exchanges heat with the ore balls, cools down and is purified, and then is discharged through the chimney. The roasting kiln rotating cylinder 24 receives the preheated ore balls sent by the preheating furnace 1. The preheated ore balls move towards the discharging port 29 of the roasting rotating cylinder along with the rotation of the roasting kiln rotating cylinder 24, and absorb the heat of the high-temperature oxygen-rich hot air (830 - 850 °C) for oxidative roasting. The roasting flue gas is discharged into the preheating furnace 1, and the roasted ore balls are unloaded into the heat preservation and cooling device 4. The hot blast stove burns stone coal vanadium ore powder, heats the hot air sent by the heat preservation and cooling device 4 into high-temperature hot air and then sends it into the roasting rotating cylinder 24. The cooling blower sends normal temperature air into the cooling cylinder 47, flowing in countercurrent with the hot ore balls. The air absorbing heat enters the hot blast stove 3 through the outlet of the cooling cylinder. The ore balls after dissipating heat are unloaded to the next process through the outlet of the heat preservation and cooling device. The main controller 52 of the roasting control system 5 is signal-connected to the preheating and roasting controller 19, the hot blast stove controller 312, and the heat preservation and cooling device controller 415 through Ethernet or control lines to control the roasting parameters such as the air volume, temperature, and ore ball moving speed of the preheating furnace 1, the roasting kiln 2, the hot blast stove 3, and the heat preservation and cooling device 4.

[0050] The preheating furnace 1 includes a flue gas purifier 11, a flue gas distributor 12, a flue gas induced draft fan 13, an ore ball feeding vehicle 14, an ore ball inlet 15, a dried ore ball discharger 16, a preheated ore ball discharger 17, a roasting flue gas buffer chamber 18, a preheating and roasting controller 19, and a first equipment platform 110. The flue gas purifier 11 is located on the first equipment platform 110, on the side of the preheating furnace 1, and its outlet is connected to the chimney. The ore ball feeding vehicle 14 is located directly in front of the ore ball inlet 15. The ore ball inlet 15 is arranged at the upper part of the preheating furnace 1 and is connected to the ore ball feeding vehicle 14 and the dried ore ball discharger 16. The ore ball feeding vehicle 14 enters the hot blast stove through the ore ball inlet 15 to send vanadium ore balls onto the dried ore ball discharger 16. The dried ore ball discharger 16 is located in the middle of the preheating furnace 1 and below the ore ball inlet 15. The preheated ore ball discharger 17 is located at the lower part of the preheating furnace 1 and directly below the dried ore ball discharger 16. The roasting kiln 2 includes a roasted ore ball feeder 21, which is connected to the preheated ore ball discharger 17 and is used to send the preheated ore balls into the roasting rotary drum 24 through the roasted ore ball feeder 21. The roasting flue gas buffer chamber 18 is located at the bottom of the preheating furnace 1, below the preheated ore ball discharger 17, and is connected to the flue gas induced draft fan 13 installed on the top platform of the preheating furnace. The roasting rotary drum 24 is provided with a high-temperature oxygen-enriched hot air inlet 28 and a roasting rotary drum discharge port 29, which are respectively connected to the hot blast stove 3 and the heat preservation and cooling device 4. The high-temperature oxygen-enriched hot air inlet 28 is used to receive the high-temperature hot air sent by the hot blast stove 3 and the oxygen-enriched air sent by the oxygen-enriched air blower. The roasting rotary drum discharge port 29 is used to discharge the roasted ore balls into the heat preservation and cooling device 4. The stone coal vanadium ore balls on the dried ore ball discharger 16 are dried by the hot flue gas and then discharged from the dried ore ball discharger 16 onto the preheated ore ball discharger 17 below. After being dried and preheated by the hot flue gas, they are discharged from the preheated ore ball discharger 17 into the roasted ore ball feeder 21 of the roasting kiln below. Under the action of the flue gas induced draft fan 13 on the top platform of the preheating furnace, the hot roasting flue gas in the roasting flue gas buffer chamber 18 passes upward through the ore balls in the preheating furnace 1, preheats and dries the vanadium ore balls, and then is discharged through the flue gas distributor 12, the flue gas induced draft fan 13, and the flue gas purifier 11 by the chimney. The preheating and roasting controller 19 is located in the main control room, is connected to the sensors at each control point of the preheating furnace through control lines, controls the normal operation of the preheating furnace, and transmits the operation parameters to the main controller.

[0051] Further, the flue gas induced draft fan 13 is installed on the external platform at the top of the preheating furnace 1, and the outlet of the flue gas induced draft fan 13 is communicated with the flue gas purifier 11. The flue gas distributor 12 is installed in the upper part of the preheating furnace 1 and communicated with the inlet of the flue gas induced draft fan 13. The flue gas induced draft fan 13 draws out the hot flue gas in the roasting flue gas buffer chamber through the flue gas distributor 12, and discharges it into the chimney after being purified by the flue gas purifier 11. The hot flue gas passes through the ore balls in the preheating furnace 1 during the rising process, drying and preheating the ore balls. The preheating roasting controller 19 is arranged in the general control room 51 on the other side of the preheating furnace 1 opposite to the flue gas purifier 11 on the first equipment platform 110.

[0052] The roasting kiln 2 further includes a roasting rotary drum flue gas outlet 22, a roasting rotary drum feed inlet 23, a first roasting rotary drum base 25, a roasting rotary drum power source 26, a second roasting rotary drum base 27, and a second equipment platform 210. The roasting rotary drum 24 is in the shape of a long circular tube and is installed longitudinally in an inclined manner. The roasting rotary drum feed inlet 23 is arranged at one end of the roasting rotary drum 24 close to the preheating furnace 1. The feed end of the roasted ore ball feeder 21 is located below the preheated ore ball discharger 17 in the roasting flue gas buffer chamber 18, and the discharge end of the roasted ore ball feeder 21 is located inside the roasting rotary drum feed inlet 23. The roasting rotary drum flue gas outlet 22 and the roasting rotary drum feed inlet 23 are at the same end and communicate with the roasting flue gas buffer chamber 18 at the bottom of the preheating furnace 1. The first roasting rotary drum base 25 and the second roasting rotary drum base 27 are located on the second equipment platform 210 and are respectively at positions close to both ends directly below the roasting rotary drum 24. The first roasting rotary drum base 25 is higher than the second roasting rotary drum base 27. The roasting rotary drum power source 26 is located on the second equipment platform 210 and is arranged at a position close to the middle of the roasting rotary drum 24. The second equipment platform 210 is the main equipment platform of the composite roasting kiln. The roasting rotary drum 24 is provided with a high-temperature oxygen-enriched hot air inlet 28 and a roasting rotary drum discharge outlet 29. The roasting rotary drum discharge outlet 29 is arranged at one end of the roasting rotary drum 24 close to the hot blast stove 3 and is connected to the heat preservation tower 41 of the heat preservation and cooling device 4. The high-temperature oxygen-enriched hot air inlet 28 and the roasting rotary drum discharge outlet 29 are at the same end of the roasting rotary drum 24 and are jointly arranged at one end of the roasting rotary drum close to the hot blast stove. The high-temperature oxygen-enriched hot air inlet 28 is connected to the high-temperature hot air outlet 36 of the hot blast stove 3 and the outlet of the oxygen-enriched air blower 37 for receiving the high-temperature oxygen-enriched hot air sent by the hot blast stove 3 and the oxygen-enriched air blower 37. The roasting rotary drum discharge outlet 29 is connected to the heat preservation tower 41 of the heat preservation and cooling device 4 for discharging the roasted ore balls into the heat preservation and cooling device 4. The preheated ore balls are sent from the preheated ore ball discharger 17 of the preheating furnace 1 to the roasting rotary drum feed inlet through the roasted ore ball feeder 21, and the roasted ore balls move orderly towards the roasting rotary drum discharge outlet 29 along with the rotation of the roasting rotary drum 24. The high-temperature hot air enters the roasting rotary drum 24 from the high-temperature hot air outlet 36 of the hot blast stove 3 through the high-temperature oxygen-enriched hot air inlet 28, and the oxygen-enriched air blower 37 sends oxygen-enriched air into the roasting rotary drum 24 through the high-temperature oxygen-enriched hot air inlet 28. The high-temperature oxygen-enriched hot air in the roasting rotary drum flows in the opposite direction to the roasted ore balls, heating and igniting the carbonaceous matter in the roasted ore balls, and the ore balls start oxidative roasting. After about 150 minutes, the roasted ore balls reach the roasting rotary drum discharge outlet and are then unloaded into the heat preservation tower of the heat preservation and cooling device. The high-temperature oxygen-enriched hot air ignites the roasted ore balls, and the combustion flue gas enters the preheating furnace flue gas buffer chamber 18 through the roasting rotary drum flue gas outlet. The preheating and roasting controller 19 is connected to the sensors at each control point of the roasting kiln through control lines, controls the normal operation of the roasting kiln, and transmits the operation parameters to the main controller.

[0053] The hot blast stove 3 includes a fuel conveyor 31, a hot blast blower 32, a hot blast buffer chamber 33, a fly ash collection tank 34 for the hot blast buffer chamber, a combustion furnace chamber 35, a high-temperature hot blast outlet 36, an oxygen-enriched air blower 37, an industrial oxygen generator 38, a fly ash collection tank 39 for the hot blast stove, a slag discharger 310, a hot blast stove operation room 311, a hot blast stove controller 312, and a third equipment platform 313. The fuel conveyor 31 is arranged on one side of the hot blast stove 3 and is communicated with the combustion furnace chamber 35 of the hot blast stove 3. The inlet of the hot blast blower 32 is connected to the hot blast buffer chamber 33, and the outlet of the hot blast blower 32 is connected to the air inlet of the combustion furnace chamber 35. The hot blast buffer chamber 33 is arranged on the other side of the hot blast stove 3, and the hot blast inlet of the hot blast buffer chamber 33 is communicated with the cooling cylinder hot blast outlet passage 45 of the heat preservation and cooling device 4. The hot blast buffer chamber 33 is provided with a fly ash collection tank 34 for the hot blast buffer chamber. The combustion furnace chamber 35 is arranged at the center of the hot blast stove. The high-temperature hot blast outlet 36 of the combustion furnace chamber 35 is arranged at the upper part directly behind the hot blast stove 3 and is communicated with the high-temperature oxygen-enriched hot blast inlet 28 of the roasting rotary drum 24. The inlet of the oxygen-enriched air blower 37 is connected to the outlet of the industrial oxygen generator 38. The oxygen-enriched air blower 37 and the industrial oxygen generator 38 are both arranged on the second equipment platform 210 and are located on the other side corresponding to the discharging end of the roasting rotary drum 24 and the cooling cylinder 47. The outlet of the oxygen-enriched air blower 37 is connected to the high-temperature oxygen-enriched hot blast inlet 28. The slag discharger 310 is arranged below the combustion furnace chamber 35 and is communicated with the slag discharge port of the combustion furnace chamber 35, the fly ash collection tank 34 for the hot blast buffer chamber, and the fly ash collection tank 39 for the hot blast stove. The hot blast stove operation room 311 is arranged on the third equipment platform 313 in front of the hot blast stove 3, and the hot blast stove controller 312 is located inside the hot blast stove operation room 311. The third equipment platform 313 is located at the lower side of the second equipment platform 210 and is the platform with the lowest position in the composite roasting kiln. The hot blast stove foundation is arranged on the third equipment platform 313, and the preheating furnace 1 foundation is located on the second equipment platform 210. The first equipment platform 110 is located above the second equipment platform 210 and is the platform with the highest position in the composite roasting kiln.

[0054] The fuel transporter 31 feeds the stone coal vanadium ore powder into the combustion chamber 35 of the hot blast stove 3. The hot blast blower 32 sucks in the hot air from the hot air buffer chamber 33 and sends it into the combustion chamber 35 to ensure the normal combustion of the stone coal vanadium ore powder in the combustion chamber. The high-temperature hot air generated by combustion is sent into the roasting kiln 2 through the high-temperature hot air outlet 36 after dust removal by the fly ash collection tank 39. The oxygen-enriched air blower 37 sends the oxygen-enriched air from the storage tank of the industrial oxygen generator 38 into the roasting rotary drum 24 through the rotary drum high-temperature oxygen-enriched hot air inlet 28, raising the oxygen content of the hot air in the roasting rotary drum to 36%. The slag after the combustion of the stone coal vanadium ore powder in the combustion chamber 35, the fly ash collection tank 39 of the hot blast stove, and the fly ash collection tank 34 of the hot air buffer chamber collect the fly ash and discharge it through the ash discharge machine, and send it to the stone coal vanadium ore ball processing factory as the raw material of the stone coal vanadium ore. The hot blast stove controller 312 in the hot blast stove operation room 311 is connected to the sensors at each control point of the hot blast stove 3 through the control line, controls the hot blast stove 3 to operate under normal working conditions, and transmits the operating parameters to the main controller 52.

[0055] The heat preservation and cooling device 4 includes a heat preservation tower 41, a cooling water coil 42, a cooled ore ball discharger 43, a cooled ore ball elevator 44, a cooling cylinder hot air outlet passage 45, a cooling cylinder feed inlet 46, a cooling cylinder 47, a cooling cylinder discharge outlet 411, a cooling blower 412, a first cooling cylinder base 48, a cooled ore ball conveyor 49, a second cooling cylinder base 410, a cooling air diverter 413, a heat preservation and cooling device operation room 414, and a heat preservation and cooling device controller 415. The foundation of the heat preservation tower 41 is located on the third equipment platform 313, and is arranged below the discharge outlet 29 of the roasting rotary cylinder, and is communicated with the discharge outlet 29 of the roasting rotary cylinder. The cooling water coil 42 is arranged below the cooled ore ball discharger 43 and above the cooled ore ball elevator 44. The water inlet of the cooling water coil 42 is communicated with a normal temperature water source, and the water outlet is communicated with a hot water storage tank. The cooled ore ball discharger 43 is arranged at the lower part of the heat preservation tower 41 and is communicated with the feed inlet of the cooled ore ball elevator 44. The cooled ore ball elevator 44 is arranged at the bottom of the heat preservation tower 41, and the discharge outlet of the cooled ore ball elevator 44 is communicated with the cooling cylinder feed inlet 46. The cooling cylinder 47 is a rectangular cylinder, which is installed longitudinally in an inclined shape, and its foundation is established on the second equipment platform 210. The air inlet end of the cooling cylinder 47 is connected to the cooling blower 412. The cooling cylinder feed inlet 46 and the cooling cylinder hot air outlet passage 45 are arranged at one end close to the heat preservation tower 41. The hot air outlet end passes through the cooling cylinder hot air outlet passage 45 in the upper part of the heat preservation tower 41 and is connected to the hot air buffer chamber 33 of the hot blast stove 3. The cooled ore ball conveyor 49 is arranged in the cooling cylinder 47. The feed end of the cooled ore ball conveyor 49 is communicated with the cooling cylinder feed inlet 46, and the discharge end is communicated with the cooling cylinder discharge outlet 411. The cooling cylinder discharge outlet 411 is arranged at the lower half of the cooling cylinder 47 at the same end as the cooling air inlet. The cooling air inlet end is connected to the cooling blower 412 and is arranged at the upper half of the other end far from the heat preservation tower 41. The first cooling cylinder base 48 and the second cooling cylinder base 410 are respectively arranged on the second equipment platform 210 directly below the cooling cylinder 47. The second cooling cylinder base 410 is higher than the first cooling cylinder base 48. The cooling blower 412 is arranged at the air inlet end of the cooling cylinder 47, and the outlet of the cooling blower 412 is connected to the upper half of the cooling cylinder 47 to send normal temperature air into the cooling cylinder 47. The cooling air diverter 413 is arranged in the cooling cylinder 47 and is installed in the space formed between the upper wall of the cooling cylinder 47 and above the cooled ore ball conveyor 49 to continuously guide the cooling air to the cooled ore ball conveyor 49. The heat preservation and cooling device operation room 414 is arranged on the second equipment platform 210 on the side of the cooling cylinder 47 close to the preheating furnace 1, and the heat preservation and cooling device controller 415 is arranged in the heat preservation and cooling device operation room 414.

[0056] The ore balls after oxidative roasting in the roasting kiln are discharged into the heat preservation tower through the discharge port 29 of the roasting rotary drum onto the cooled ore ball discharger 43. The cooled ore ball discharger 43 discharges the ore balls preliminarily cooled by the cooling water coil 42 and the hot air outlet channel 45 of the cooling drum into the lower part of the heat preservation tower 41. The cooled ore ball elevator 44 at the bottom of the heat preservation tower evenly feeds the ore balls into the cooled ore ball conveyor 49 in the cooling drum through the cooling drum feed port 46. The ore balls move orderly along with the cooled ore ball conveyor towards the cooling drum discharge port 411, and release heat by convection with the normal temperature air sent by the cooling blower 412, and the temperature is reduced during the movement. After about 120 minutes, they are discharged from the cooling drum discharge port. The normal temperature air absorbs the heat released by the ore balls during the flow under the action of the cooling air diverter 413, and further increases the temperature when passing through the hot air outlet channel 45 of the upper part of the heat preservation tower 41 and then enters the hot air buffer chamber 33 of the hot blast stove 3. The heat preservation and cooling device controller 415 in the heat preservation and cooling device operation room 414 is connected to the sensors at each control point of the heat preservation and cooling device through the control line, controls the heat preservation and cooling device to operate under normal working conditions, and transmits the operation parameters to the master controller.

[0057] The roasting control system 5 includes a master control room 51, which is arranged on the first equipment platform 110 on the side of the preheating furnace 1 near the roasting rotary drum feed port 23. In the master control room 51, there are arranged a master controller 52, a monitoring monitor 53, a master operation console 54 and a preheating and roasting controller 19. The master controller 52, the monitoring monitor 53, and the master operation console 54 are connected to the controllers of each subsystem and the sensors at the control points through the control line or Ethernet signal. The master controller 52 adjusts the controllers of each relevant subsystem according to the programmed parameters such as wind pressure, air volume, time, temperature, and material level; the monitoring monitor 53 monitors the operation status of the composite roasting kiln and monitors the operation parameters of the composite roasting kiln. The operator of the master operation console 54 makes corrections according to the abnormal conditions fed back by the master controller 52 and the monitoring monitor 53 to ensure the normal operation of the composite roasting kiln furnace.

[0058] It should be noted that the composite roasting kiln of the present invention can also be used for roasting non-ferrous metal ores such as lithium ore, rubidium ore, cesium ore, molybdenum ore, silver ore, nickel ore, etc. Embodiment

[0059] The present invention also provides a method for oxidative roasting of stone coal type vanadium ore using the above-mentioned composite roasting kiln, which includes the following steps:

[0060] Step 1: Turn on the power supplies of the master control room 51, the hot blast stove operation room 311, and the heat preservation and cooling device operation room 414, detect that the entire roasting control system is in a normal working state, and start the initial operation mode of the master controller 52.

[0061] Step 2: Start the ore ball feeder 14 to convey vanadium ore balls to the preheating furnace 1. When the ore balls on the dry ore ball discharger 16 of the preheating furnace 1 reach the specified upper height limit, automatically shut down the ore ball feeder 14.

[0062] Step 3: Start the fuel conveyor 31 to supply stone coal vanadium ore powder to the hot blast stove 3. Control the feeding amount, automatically start the hot blast blower 32 of the hot blast stove 3, and ignite the stone coal vanadium ore powder in the hot blast stove 3. The stone coal vanadium ore powder in the hot blast stove 3 continues to burn, and the burning hot air continuously flows through the high-temperature oxygen-enriched hot air inlet 28 to the roasting kiln 2. After the burned slag and fly ash accumulate to the specified level, automatically start the ash and slag discharger 310, and automatically shut down after clearing the ash and slag.

[0063] Step 4: When the flue gas temperature in the roasting flue gas buffer chamber 18 of the preheating furnace 1 reaches 600 °C, successively and automatically start the flue gas induced draft fan 13, flue gas purifier 11, roasting rotary drum 24, oxygen-enriched air blower 37, and industrial oxygen generator 38 of the preheating furnace 1.

[0064] Step 5: When the temperature of the ore balls on the dry ore ball discharger 16 reaches 450 °C, automatically start the dry ore ball discharger 16 to discharge the dry ore balls onto the preheated ore ball discharger 17. When the height of the ore balls on the dry ore ball discharger 16 is at the specified lower limit, the dry ore ball discharger 16 is closed, and start the ore ball feeder 14 to supplement vanadium ore balls to reach the specified upper height limit on the dry ore ball discharger 16.

[0065] Step 6: After the ore balls on the preheated ore ball discharger 17 reach the specified upper height limit, automatically start the preheated ore ball discharger 17 to discharge the preheated ore balls into the roasting ore ball feeder 21 of the roasting kiln 2. When the height of the ore balls on the preheated ore ball discharger 17 reaches the specified lower limit, the preheated ore ball discharger 17 is closed.

[0066] Step 7: The roasting ore ball feeder 21 automatically and continuously conveys the preheated ore balls to the roasting rotary drum 24. The preheated ore balls entering the roasting rotary drum 24 move towards the hot blast stove 3 along with the rotation of the roasting rotary drum 24, and convect with the high-temperature oxygen-enriched hot air sent into the roasting rotary drum 24 by the hot blast stove 3 and the oxygen-enriched air blower 37, adsorb heat, and perform oxidative roasting. The roasted ore balls after completing the oxidative roasting process move to the roasting rotary drum discharge port 29, and the roasted ore balls are conveyed to the heat preservation tower 41 of the heat preservation and cooling device 4.

[0067] Step 8: When the ore balls on the cooled ore ball discharger 43 of the heat preservation tower 41 reach the specified upper height limit, automatically start the cooling water coil 42, automatically start the cooled ore ball discharger 43 to discharge the ore balls onto the cooled ore ball elevator 44. When the discharged cooled ore balls reach the specified lower limit, close the cooled ore ball discharger 43.

[0068] Step 9: Automatically start the cooled ore ball elevator 44, the cooling blower 412, and the cooled ore ball conveyor 49. The cooled ore ball elevator 44 feeds the ore balls into the cooled ore ball conveyor 49 through the cooling cylinder feed inlet 46. The cooled ore ball conveyor 49 carries the ore balls and moves towards the cooling cylinder discharge outlet 411, exchanging heat by convection with the normal-temperature air sent by the cooling blower 412. The ore balls in the cooled ore ball conveyor 49 are cooled and move to the cooling cylinder discharge outlet 411 to be discharged to the leaching process, ending the vanadium ore oxidation roasting process, and the composite roasting kiln completes the initial startup mode.

[0069] Step 10: The total controller 52 automatically switches to the normal operation mode, repeating Steps 2 to 9. The ore ball distributing vehicle 14 continuously feeds the stone coal vanadium ore balls into the preheating furnace 1, the flue gas induced draft fan 13 of the preheating furnace 1 continuously discharges the purified roasting flue gas, the stone coal vanadium ore powder and hot air are continuously fed into the hot blast stove 3, the high-temperature oxygen-rich hot air is continuously fed into the roasting rotary drum 24, the ore balls in the roasting rotary drum 24 continuously undergo oxidation roasting, the roasted ore balls are continuously fed into the heat preservation and cooling device 4, the cooling blower 412 continuously feeds normal-temperature air, the hot air is continuously fed into the hot air buffer chamber 33 of the hot blast stove 3, and the cooled ore balls are continuously output to the leaching process, and the composite roasting kiln enters the normal working state. Embodiment

[0070] The present invention also provides a roasting method for non-ferrous metal ores using the above composite roasting kiln. The non-ferrous metal ores include lithium, rubidium, cesium, molybdenum, silver, nickel ores, etc. The roasting method includes the following steps:

[0071] Step 1: Connect the power supplies of the general control room 51, the hot blast stove operation room 311, and the heat preservation and cooling device operation room 414, detect that the entire roasting control system is in a normal working state, and start the initial operation mode of the total controller 52.

[0072] Step 2: Start the ore ball distributing vehicle 14 to transport non-ferrous metal ore balls such as lithium to the preheating furnace 1. When the ore balls on the dry ore ball discharger 16 of the preheating furnace 1 reach the specified upper height limit, automatically turn off the ore ball distributing vehicle 14.

[0073] Step 3: Start the fuel conveyor 31 to supply pulverized coal or natural gas to the hot blast stove 3, control the feeding amount, automatically start the hot air blower 32 of the hot blast stove 3, ignite the pulverized coal or natural gas in the hot blast stove 3, the pulverized coal or natural gas in the hot blast stove 3 continues to burn, and the burned hot air continuously flows towards the roasting kiln 2 through the high-temperature oxygen-rich hot air inlet 28. After the burned slag and fly ash accumulate to the specified material level, automatically start the ash slag discharger 310, and automatically stop after clearing the ash slag.

[0074] Step 4: When the flue gas temperature in the roasting flue gas buffer chamber 18 of the preheating furnace 1 reaches 600 °C, the induced draft fan 13, flue gas purifier 11, roasting rotary drum 24, oxygen-enriched air blower 37 and industrial oxygen generator 38 of the preheating furnace 1 are automatically started successively.

[0075] Step 5: When the temperature of the ore balls on the drying ore ball discharger 16 reaches 450 °C, the drying ore ball discharger 16 is automatically started to discharge the dried ore balls onto the preheated ore ball discharger 17. When the height of the ore balls on the drying ore ball discharger 16 reaches the lower limit of the specified height, the drying ore ball discharger 16 is closed, and the ore ball feeding vehicle 14 is started to supplement the vanadium ore balls to reach the upper limit of the specified height on the drying ore ball discharger 16.

[0076] Step 6: After the ore balls on the preheated ore ball discharger 17 reach the upper limit of the specified height, the preheated ore ball discharger 17 is automatically started to discharge the preheated ore balls into the roasting ore ball feeder 21 of the roasting kiln 2. When the height of the ore balls on the preheated ore ball discharger 17 reaches the lower limit of the specified height, the preheated ore ball discharger 17 is closed.

[0077] Step 7: The roasting ore ball feeder 21 automatically and continuously conveys the preheated ore balls to the roasting rotary drum 24. The preheated ore balls entering the roasting rotary drum 24 move towards the hot blast stove 3 as the roasting rotary drum 24 rotates, and convect with the high-temperature oxygen-enriched hot air sent by the hot blast stove 3 and the oxygen-enriched air blower 37 into the roasting rotary drum 24 to adsorb heat and carry out oxidation roasting. After the oxidation roasting process is completed, the roasted ore balls move to the discharging port 29 of the roasting rotary drum and are conveyed to the heat preservation tower 41 of the heat preservation and cooling device 4.

[0078] Step 8: When the ore balls on the cooling ore ball discharger 43 of the heat preservation tower 41 reach the upper limit of the specified height, the cooling water coil 42 is automatically started, and the cooling ore ball discharger 43 is automatically started to discharge the ore balls onto the cooling ore ball elevator 44. When the discharged ore balls reach the lower limit of the specified height, the cooling ore ball discharger 43 is closed.

[0079] Step 9: The cooling ore ball elevator 44, cooling blower 412 and cooling ore ball conveyor 49 are automatically started. The cooling ore ball elevator 44 feeds the ore balls into the cooling ore ball conveyor 49 through the cooling cylinder feed port 46. The cooling ore ball conveyor 49 carries the ore balls and moves towards the cooling cylinder discharge port 411, convecting and exchanging heat with the normal temperature air sent by the cooling blower 412. The ore balls in the cooling ore ball conveyor 49 are cooled and move to the cooling cylinder discharge port 411 and are discharged to the leaching process, and the roasting process of the lithium and other non-ferrous metal ores ends, and the composite roasting kiln completes the initial startup mode.

[0080] Step Ten: The total controller 52 automatically switches to the normal operation mode, and Steps Two to Nine are repeated. The ore ball distributing vehicle 14 continuously feeds non-ferrous metal ore balls such as lithium into the preheating furnace 1. The flue gas induced draft fan 13 of the preheating furnace 1 continuously discharges the purified roasting flue gas. Pulverized coal or natural gas and hot air are continuously fed into the hot blast stove 3. High-temperature oxygen-rich hot air is continuously fed into the roasting rotary drum 24. The ore balls in the roasting rotary drum 24 continuously undergo oxidative roasting. The roasted ore balls are continuously fed into the heat preservation and cooling device 4. The cooling blower 412 continuously feeds normal temperature air. The hot air is continuously fed into the hot air buffer chamber 33 of the hot blast stove 3. The cooled ore balls are continuously output to the leaching process, and the composite roasting kiln enters the normal working state.

[0081] The foregoing description of the specific exemplary embodiments of the present invention is for purposes of illustration and exemplification. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is apparent that many changes and variations are possible in light of the above teaching. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the invention and its practical applications, so that those skilled in the art can implement and utilize the various different exemplary embodiments of the invention, as well as various different selections and changes. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A composite roasting kiln, characterized in that: It comprises a preheating furnace (1), a roasting kiln (2), a hot air furnace (3) and a heat preservation and cooling device (4); The preheating furnace (1) comprises a ball distribution vehicle (14), a ball inlet (15), a dry ball discharger (16), a preheating ball discharger (17) and a roasting fume buffer chamber (18). The ball distribution vehicle (14) is located directly in front of the ball inlet (15). The ball inlet (15) is arranged at the upper part of the preheating furnace (1) and is connected to the ball distribution vehicle (14) and the dry ball discharger (16). The ball distribution vehicle (14) enters the preheating furnace (18) through the ball inlet (15). 1) feeding the ore balls to a drying ore ball discharger (16), the drying ore ball discharger (16) being located in the middle of the preheating furnace (1) and below the ore ball inlet (15), the preheating ore ball discharger (17) being located in the lower part of the preheating furnace (1) and directly below the drying ore ball discharger (16), the roasting fume buffer chamber (18) being located at the bottom of the preheating furnace (1) and below the preheating ore ball discharger (17), and being connected to a fume induced draft fan (13) installed on the top platform of the preheating furnace; The roasting kiln (2) comprises a roasting ore ball feeder (21) and a roasting rotating drum (24), wherein the roasting ore ball feeder (21) is connected to the preheating ore ball discharger (17), and the feed end of the roasting ore ball feeder (21) is located below the preheating ore ball discharger (17) in the roasting flue gas buffer chamber (18), and the roasting rotating drum (24) is provided with a high-temperature oxygen-enriched hot air inlet (28) and a roasting rotating drum discharge port (29), and the high-temperature oxygen-enriched hot air inlet (28) and the roasting rotating drum discharge port (29) are respectively connected to the hot air furnace (3) and the heat preservation and cooling device (4), and the roasted ore balls after completing the oxidation roasting process are moved to the roasting rotating drum discharge port (29) and transported to the heat preservation tower (41) of the heat preservation and cooling device (4); The heat preservation and cooling device (4) comprises the heat preservation tower (41), a cooling ore ball discharger (43) and a cooling ore ball elevator (44); the heat preservation tower (41) is arranged below the roasting rotary drum discharge port (29) and is in communication with the roasting rotary drum discharge port (29); the cooling ore ball elevator (44) is arranged at the bottom of the heat preservation tower (41); the cooling ore ball discharger (43) is arranged at the lower part of the heat preservation tower (41) and is in communication with the feed port of the cooling ore ball elevator (44).

2. The composite roasting kiln according to claim 1, characterized in that: The roasting smoke buffer chamber (18) is also provided with a roasting rotary drum feed port (23), the lower part of which is communicated with the roasting rotary drum smoke outlet (22) of the roasting kiln (2). The preheating furnace (1) also includes a smoke purifier (11), a smoke distributor (12), a smoke induced draft fan (13), a preheating roasting controller (19) and a first equipment platform (110). The smoke purifier (11) is located on the side of the preheating furnace (1), and the smoke induced draft fan (13) is installed on the external platform on the top of the preheating furnace (1). The inlet of the smoke induced draft fan (13) is communicated with the smoke distributor (12), and the outlet of the smoke induced draft fan (13) is communicated with the smoke purifier (11). The smoke purifier (11) is located on the first equipment platform (110).

3. The composite roasting kiln according to claim 2, characterized in that: The roasting kiln (2) further comprises a roasting rotating drum smoke outlet (22), a first roasting rotating drum base (25), a roasting rotating drum power (26), a second roasting rotating drum base (27) and a second equipment platform (210); the roasting rotating drum (24) is in the shape of an oblong tube and is longitudinally installed on the first roasting rotating drum base (25) and the second roasting rotating drum base (27) in an inclined state, wherein the first roasting rotating drum base (25) is higher than the second roasting rotating drum base (27); the roasting rotating drum feed port (23) is arranged at one end of the preheating furnace (1) close to the roasting rotating drum (24); the discharge end of the roasting ore ball feeder (21) is located in the roasting rotating drum feed port (23); the roasting rotating drum smoke outlet (22) and the roasting rotating drum feed port (23) are connected to each other; At the same end, it is communicated with the roasting fume buffer chamber (18) at the bottom of the preheating furnace (1); the first roasting rotating cylinder base (25) and the second roasting rotating cylinder base (27) are located on the second equipment platform (210), and are respectively located directly below the roasting rotating cylinder (24) near the two ends; the roasting rotating cylinder power (26) is located on the second equipment platform (210) and is arranged near the middle of the roasting rotating cylinder (24); the roasting rotating cylinder discharge port (29) is arranged at one end of the roasting rotating cylinder (24) near the hot blast furnace (3); the high-temperature oxygen-enriched hot air inlet (28) and the roasting rotating cylinder discharge port (29) are located at the same end of the roasting rotating cylinder (24), and are communicated with the high-temperature hot air outlet (36) and the outlet of the oxygen-enriched air blower (37) of the hot blast furnace (3).

4. The composite roasting kiln according to claim 2, characterized in that: The hot blast furnace (3) comprises a fuel conveyor (31), a hot blast blower (32), a hot blast buffer chamber (33), a hot blast buffer chamber fly ash collecting tank (34), a combustion furnace (35), a high-temperature hot blast outlet (36), an oxygen-enriched air blower (37) and an industrial oxygen generator (38); the fuel conveyor (31) is arranged on one side of the hot blast furnace (3) and is connected to the combustion furnace (35) of the hot blast furnace (3); the inlet of the hot blast blower (32) is connected to the hot blast buffer chamber (33); the outlet of the hot blast blower (32) is connected to the combustion furnace (35); The hot air buffer chamber (33) is arranged on the other side of the hot air furnace (3), the hot air inlet of the hot air buffer chamber (33) is connected to the hot air outlet channel (45) of the cooling cylinder of the heat preservation cooling device (4), the hot air buffer chamber (33) is provided with a hot air buffer chamber fly ash collecting trough (34), the combustion furnace (35) is arranged at the center of the hot air furnace, the high-temperature hot air outlet (36) of the combustion furnace (35) is arranged at the upper part of the rear of the hot air furnace (3), and is connected to the high-temperature oxygen-enriched hot air inlet (28) of the roasting rotating cylinder (24).

5. The composite roasting kiln according to claim 4, characterized in that: The inlet of the oxygen-enriched air blower (37) is connected to the outlet of the industrial oxygen generator (38). The oxygen-enriched air blower (37) and the industrial oxygen generator (38) are both arranged on the second equipment platform (210) and are located on the other side of the discharging end of the roasting rotating cylinder (24) corresponding to the cooling cylinder (47). The outlet of the oxygen-enriched air blower (37) is connected to the high-temperature oxygen-enriched hot air inlet (28). The hot blast furnace (3) further includes a hot blast furnace fly ash collecting tank (39), an ash discharger (310), a hot blast furnace operating room (311), a hot blast furnace controller (312) and a third equipment The ash discharging machine (310) is arranged below the combustion furnace (35) and is connected to the ash discharge port of the combustion furnace (35), the fly ash collecting trough (34) of the hot blast buffer chamber and the fly ash collecting trough (39) of the hot blast furnace. The hot blast furnace operating room (311) is arranged on a third equipment platform (313) in front of the hot blast furnace (3). The hot blast furnace controller (312) is located in the hot blast furnace operating room (311). The third equipment platform (313) is located below the side of the second equipment platform (210). The first equipment platform (110) is located above the second equipment platform (210).

6. The composite roasting kiln according to claim 5, characterized in that: The invention also includes a roasting control system (5), wherein the roasting control system (5) includes a main control room (51), which is arranged on the first equipment platform (110) on the side of the preheating furnace (1) close to the roasting rotary drum feed port (23), and the main control room (51) is provided with a main controller (52), a monitoring monitor (53), a main operation console (54) and a preheating roasting controller (19). The main controller (52), the monitoring monitor (53), the main operation console (54) and the controllers and control units of each subsystem are connected to the main control room (51). The control point sensor is connected via a control line or an Ethernet signal. The preheating roasting controller (19) is arranged in a main control room (51) on the other side of the preheating furnace (1) opposite to the flue gas purifier (11) on the first equipment platform (110); the heat preservation cooling device (4) includes a cooling water coil (42), a cooling cylinder hot air outlet channel (45), a cooling cylinder feed port (46), a cooling cylinder (47), a cooling cylinder discharge port (411) and a cooling blower (412). The foundation of the heat preservation tower (41) is located at the third On the equipment platform (313), a cooling water coil (42) is arranged below the cooling ore ball discharger (43) and above the cooling ore ball elevator (44); the water inlet of the cooling water coil (42) is connected to a normal temperature water source, and the water outlet is connected to a hot water storage tank; the discharge port of the cooling ore ball elevator (44) is connected to the cooling cylinder feed port (46); the cooling cylinder (47) is a rectangular cylinder, which is installed in an inclined shape in the longitudinal direction, and its foundation is set on the second equipment platform (210); the air inlet of the cooling cylinder (47) The end is connected to the cooling blower (412), the hot air outlet end passes through the hot air outlet channel (45) of the cooling cylinder at the upper part of the insulation tower (41) and is connected to the hot air buffer chamber (33) of the hot air furnace (3), a cooling ore ball conveyor (49) is arranged in the cooling cylinder (47), the feeding end of the cooling ore ball conveyor (49) is connected to the cooling cylinder feeding port (46), and the discharging end is connected to the cooling cylinder discharging port (411), and the cooling cylinder discharging port (411) is arranged in the lower half of the cooling cylinder (47) at the cooling air inlet end.

7. The composite roasting kiln according to claim 6, characterized in that: The thermal insulation cooling device (4) further comprises a first cooling cylinder base (48), a cooling ball conveyor (49), a second cooling cylinder base (410), a cooling air diverter (413), a thermal insulation cooling device operating room (414) and a thermal insulation cooling device controller (415), wherein the first cooling cylinder base (48) and the second cooling cylinder base (410) are respectively arranged on a second equipment platform (210) directly below the cooling cylinder (47), wherein the second cooling cylinder base (410) is higher than the first cooling cylinder base (48), and the cooling blower (412) is arranged on the cooling cylinder. (47) air inlet end, the outlet of the cooling blower (412) is connected to the upper half of the cooling cylinder (47), and the room temperature air is sent into the cooling cylinder (47). The cooling air diverter (413) is arranged in the cooling cylinder (47) and installed in the space formed between the upper wall of the cooling cylinder (47) and the top of the cooling ball conveyor (49). The heat preservation cooling device operating room (414) is arranged on the second equipment platform (210) on the side of the cooling cylinder (47) close to the preheating furnace. The heat preservation cooling device operating room (414) is arranged with a heat preservation cooling device controller (415).

8. A method for oxidative roasting of stone coal type vanadium ore using the composite roasting kiln according to claim 7, characterized in that: The steps include: Step 1, turning on the power of the main control room (51), the hot air furnace operation room (311), and the heat preservation and cooling device operation room (414), checking that the roasting control system is all in normal working state, and starting the main controller (52) in the initial operation mode; Step 2: Start the ball distribution vehicle (14) to transport the stone coal vanadium balls to the preheating furnace (1); when the balls on the dry ball discharger (16) of the preheating furnace (1) reach a specified upper limit of height, the ball distribution vehicle (14) is automatically closed; Step 3: Start the fuel conveyor (31) to supply stone coal vanadium ore powder to the hot blast furnace (3), control the feeding amount, automatically start the hot air blower (32) of the hot blast furnace (3), ignite the stone coal vanadium ore powder in the hot blast furnace (3), and continuously burn the stone coal vanadium ore powder in the hot blast furnace (3). The burning hot air continuously flows to the roasting kiln (2) through the high-temperature oxygen-rich hot air inlet (28). After the burned slag and fly ash accumulate to a specified material level, the ash discharger (310) is automatically started, and the machine automatically stops after the ash is discharged; Step 4: When the flue gas temperature in the roasting flue gas buffer chamber (18) of the preheating furnace (1) reaches 600° C., the flue gas induced draft fan (13), the flue gas purifier (11), the roasting rotary drum (24), the oxygen-enriched air blower (37) and the industrial oxygen generator (38) of the preheating furnace (1) are automatically started in sequence; Step 5: When the temperature of the ore balls on the dry ore ball discharger (16) reaches 450° C., the dry ore ball discharger (16) is automatically started to discharge the dry ore balls to the preheated ore ball discharger (17); when the height of the ore balls on the dry ore ball discharger (16) is at a prescribed lower limit, the dry ore ball discharger (16) is closed, and the ore ball distribution vehicle (14) is started to replenish vanadium ore balls to reach the prescribed upper limit of the height on the dry ore ball discharger (16); Step 6: When the ore balls on the preheated ore ball discharger (17) reach a specified upper limit of height, the preheated ore ball discharger (17) is automatically started to discharge the preheated ore balls into the roasting ore ball feeder (21) of the roasting kiln (2); when the height of the ore balls on the preheated ore ball discharger (17) reaches a specified lower limit of height, the preheated ore ball discharger (17) is closed; Step 7, the roasting ore ball feeder (21) automatically and continuously feeds the preheated ore balls to the roasting rotating drum (24), and the preheated ore balls entering the roasting rotating drum (24) move toward the hot blast furnace (3) as the roasting rotating drum (24) rotates, and convect with the high-temperature oxygen-rich hot air sent into the roasting rotating drum (24) by the hot blast furnace (3) and the oxygen-rich air blower (37), absorb heat, and perform oxidation roasting. After the oxidation roasting process is completed, the roasted ore balls move to the roasting rotating drum discharge port (29), and are transported to the insulation tower (41) of the insulation cooling device (4); Step 8, when the ore balls on the cooling ore ball discharger (43) of the insulation tower (41) reach a specified upper limit of height, the cooling water coil (42) is automatically started, and the cooling ore ball discharger (43) is automatically started to discharge the ore balls to the cooling ore ball elevator (44); when the cooling ore balls are discharged to a specified lower limit of height, the cooling ore ball discharger (43) is closed; Step nine, automatically start the cooling ball elevator (44), the cooling blower (412) and the cooling ball conveyor (49), the cooling ball elevator (44) delivers the balls to the cooling ball conveyor (49) through the cooling drum feed port (46), the cooling ball conveyor (49) carries the balls to move toward the cooling drum discharge port (411), and exchanges heat with the room temperature air delivered by the cooling blower (412) by convection, the balls in the cooling ball conveyor (49) are cooled, moved to the cooling drum discharge port (411), and discharged to the leaching process, the oxidation roasting process of the vanadium ore is completed, the composite roasting kiln completes the initial startup mode, and switches to the normal operation mode.

9. A method for roasting nonferrous metal ores using the composite roasting kiln according to claim 7, characterized in that: The steps include: Step 1, turning on the power of the main control room (51), the hot air furnace operation room (311), and the heat preservation and cooling device operation room (414), checking that the roasting control system is all in normal working state, and starting the main controller (52) in the initial operation mode; Step 2: Start the ball distribution vehicle (14) to transport non-ferrous metal balls to the preheating furnace (1). The non-ferrous metal ores include lithium ore, rubidium ore, cesium ore, molybdenum ore, silver ore, and nickel ore. When the balls on the dry ball discharger (16) of the preheating furnace (1) reach a specified upper limit of height, the ball distribution vehicle (14) is automatically closed. Step 3: Start the fuel conveyor (31) to supply pulverized coal or natural gas to the hot blast furnace (3), control the feeding amount, automatically start the hot air blower (32) of the hot blast furnace (3), ignite the pulverized coal or natural gas in the hot blast furnace (3), and continuously burn the pulverized coal or natural gas in the hot blast furnace (3). The hot air from the burning continuously flows to the roasting kiln (2) through the high-temperature oxygen-rich hot air inlet (28). When the burned slag and fly ash accumulate to a specified material level, the ash discharger (310) is automatically started, and the machine automatically stops after the ash is discharged; Step 4: When the flue gas temperature in the roasting flue gas buffer chamber (18) of the preheating furnace (1) reaches 600° C., the flue gas induced draft fan (13), the flue gas purifier (11), the roasting rotary drum (24), the oxygen-enriched air blower (37) and the industrial oxygen generator (38) of the preheating furnace (1) are automatically started in sequence; Step 5: When the temperature of the ore balls on the dry ore ball discharger (16) reaches 450° C., the dry ore ball discharger (16) is automatically started to discharge the dry ore balls onto the preheated ore ball discharger (17); when the height of the ore balls on the dry ore ball discharger (16) is at a prescribed lower limit, the dry ore ball discharger (16) is closed, and the ore ball distribution vehicle (14) is started to replenish the non-ferrous metal ore balls to reach the prescribed upper limit of the height on the dry ore ball discharger (16); Step 6: When the ore balls on the preheated ore ball discharger (17) reach a specified upper limit of height, the preheated ore ball discharger (17) is automatically started to discharge the preheated ore balls into the roasting ore ball feeder (21) of the roasting kiln (2); when the height of the ore balls on the preheated ore ball discharger (17) reaches a specified lower limit of height, the preheated ore ball discharger (17) is closed; Step 7, the roasting ore ball feeder (21) automatically and continuously feeds the preheated ore balls to the roasting rotating drum (24), and the preheated ore balls entering the roasting rotating drum (24) move toward the hot blast furnace (3) as the roasting rotating drum (24) rotates, and convect with the high-temperature oxygen-rich hot air sent into the roasting rotating drum (24) by the hot blast furnace (3) and the oxygen-rich air blower (37), absorb heat, and perform oxidation roasting. After the oxidation roasting process is completed, the roasted ore balls move to the roasting rotating drum discharge port (29), and are transported to the insulation tower (41) of the insulation cooling device (4); Step 8, when the ore balls on the cooling ore ball discharger (43) of the insulation tower (41) reach a specified upper limit of height, the cooling water coil (42) is automatically started, and the cooling ore ball discharger (43) is automatically started to discharge the ore balls to the cooling ore ball elevator (44); when the cooling ore balls are discharged to a specified lower limit of height, the cooling ore ball discharger (43) is closed; Step nine, automatically start the cooling ball elevator (44), the cooling blower (412) and the cooling ball conveyor (49), the cooling ball elevator (44) delivers the balls to the cooling ball conveyor (49) through the cooling cylinder feed port (46), the cooling ball conveyor (49) carries the balls to move toward the cooling cylinder discharge port (411), and exchanges heat with the normal temperature air delivered by the cooling blower (412) by convection, the balls in the cooling ball conveyor (49) are cooled, moved to the cooling cylinder discharge port (411), and discharged to the leaching process, the non-ferrous metal ball roasting process is completed, the composite roasting kiln completes the initial startup mode, and switches to the normal operation mode.

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