L-shaped mineral roasting kiln

Abstract

The utility model relates to the technical field of mineral dressing and smelting, in particular to an L-shaped mineral roasting kiln. Comprising a shaft kiln and a tunnel kiln, the shaft kiln comprises a zone A and a zone B, and the tunnel kiln comprises a zone C, a zone D and a zone E. According to the utility model, mineral aggregates are ground into balls, and the roasting task is completed by combining the shaft kiln and the tunnel kiln. The production line has the advantages that eleven working procedures of stirring, brick extruding, strip cutting, blank cutting, blank stacking, ferrying, drying, ferrying, roasting, ferrying, brick breaking and the like in the original brick making working section are reduced, equipment investment and installation cost are reduced, and personnel and energy consumption are saved; and in the roasting section, the length of the tunnel kiln is reduced, 120 kiln cars are reduced, and the procedures and investment of brick breaking and the like are reduced.

Description

Technical Field

[0001] This utility model relates to the field of mineral beneficiation and metallurgy technology, specifically to an L-shaped mineral roasting kiln. Background Technology

[0002] There are many pyrometallurgical tools used in mineral beneficiation and production, mainly including vertical kilns, rotary kilns, tunnel kilns, fluidized bed furnaces, electric arc furnaces, and suspension furnaces.

[0003] For pyrometallurgically roasted minerals requiring prolonged oxidation, tunnel kilns are necessary, such as those used for vanadium shale and vanadium clay. Currently, the best pyrometallurgical vanadium mine in Gansu is Western Mining's Bolun Vanadium Mine. Tunnel kiln roasting of vanadium clay for brick making yields excellent results. However, the brick-making, stacking, drying, roasting, multiple kiln car transfers, and crushing processes are numerous and cumbersome, resulting in high equipment and kiln construction investment and costs. Overcoming these disadvantages requires innovation and reform, and the L-type ore roasting kiln was invented under this background. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides an L-shaped mineral roasting kiln, which mainly solves the problems of complex processes and high processing costs in traditional tunnel kilns.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] An L-shaped mineral roasting kiln includes a vertical kiln and a tunnel kiln;

[0007] The vertical kiln includes:

[0008] Zone A is located at the top of the vertical kiln. A flue is installed on the top of Zone A, and a second fume extractor is installed at the outer end of the flue. A feed inlet is located on the right side of Zone A, and the feed inlet is equipped with a fireproof sealing door.

[0009] Zone B is located in the middle of the vertical kiln. A self-ignition chamber temperature measuring point is set on the side of the kiln in Zone B, and a manual inspection port is set on the side of the kiln. A fireproof and explosion-proof viewing mirror is installed inside the manual inspection port, and an ignition hole is set on the side of the kiln in Zone B.

[0010] Zone C: It is located at the bottom of the vertical kiln, and a transport channel is set inside it. The transport channel is equipped with conveying equipment, and a pressure reducing plate and a feeder are set inside Zone C, leaving an interface for the tunnel kiln.

[0011] The tunnel kiln includes:

[0012] Zone D: It is located at the front section of the tunnel kiln and is connected to the vertical kiln. Several flame guns are set on both sides of the kiln in Zone D, and multiple temperature measuring points are set in the middle of the top of the kiln in Zone D.

[0013] Zone E is located at the tail end of the tunnel kiln. An exhaust vent is provided inside Zone E, and an exhaust fan is installed on the exhaust vent.

[0014] Preferably, a water circulation pipe is provided on the inner wall of the kiln in zone B. One end of the water circulation pipe is connected to the water supply unit, and the other end is connected to the water user unit.

[0015] Preferably, the outlet of zone E is provided with an unloading pool.

[0016] Preferably, a feeder is provided on the pressure reducing plate.

[0017] Preferably, an operating platform is provided outside the feed inlet.

[0018] Preferably, the pressure-reducing plate is supported by an inclined plate.

[0019] Preferably, a firebox is provided in the interlayer of the side walls of the D and E areas, and a flame nozzle is reserved on the firebox.

[0020] This utility model provides an L-shaped mineral roasting kiln, which has the following beneficial effects:

[0021] 1. In this utility model, the ore is ground into balls and the firing process is completed using a combination of vertical kiln and tunnel kiln. Its advantages include reducing eleven processes in the original brick-making section, such as mixing, extruding, cutting strips, cutting blanks, stacking blanks, transferring, drying, transferring, firing, transferring, and breaking bricks; reducing equipment investment, installation costs, and saving personnel and energy consumption; and in the firing section, reducing the length of the tunnel kiln, reducing the number of kiln cars by 120, and reducing the number of brick-breaking processes and investments.

[0022] 2. In this utility model, the ore roasting can be carried out using two disordered transportation methods: chain conveyor and kiln car. This is superior to brick-shaped materials, which can only be transported by kiln cars and must be stacked in an orderly manner and dried before roasting. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of an L-shaped mineral roasting kiln according to the present invention;

[0024] Figure 2 This is a cross-sectional structural diagram of areas C, D, and E in this utility model.

[0025] In the diagram: 1-Feed inlet, 2-Flue duct, 3-Vertical kiln ignition hole, 4-Feeder, 5-Pressure reducing plate, 7-Conveying equipment, 9-Front spray gun nozzle, 10-Middle spray gun nozzle, 11-Temperature measuring point, 12-Heat extraction hole, 13-Manual observation port, 14-Operating platform, 15-Exhaust fan, 16-Flue extractor one, 17-Flue extractor two, 18-Water circulation pipe, 19-Self-combustion chamber temperature measuring point. Detailed Implementation

[0026] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0027] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] Please see Figure 1-2 In this invention, a technical solution is provided:

[0030] An L-shaped mineral roasting kiln includes a vertical kiln and a tunnel kiln:

[0031] Area A, located above the vertical kiln, is 3m high, 3m wide, 4m long, and has a volume of 36m³. 3 Newly produced pellets are filled manually or mechanically, with each filling consisting of 18m³ of ore. 3 To limit spontaneous combustion in this area, a flue duct 2 is installed on the top of the kiln, and a second smoke extractor 17 is installed at the outer end of the flue duct 2. A feed inlet 1 is installed on the right side of the kiln, and a fireproof sealing door is installed at the feed inlet 1 to realize material preparation, drying and flue gas discharge.

[0032] Section B: Located in the center of the vertical kiln, it is 18.8m high, 3m wide, 4m long, and has a volume of 225.6m³. 3 In Zone A, the drying material is continuously fed under gravity. A self-ignition chamber temperature measuring point 19 is set on the side of the kiln to detect the temperature of the self-ignition chamber. A manual inspection port 13 is also set on the side of the kiln. The manual inspection port 13 is equipped with a fireproof and explosion-proof viewing mirror to facilitate the staff to observe the inside of the self-ignition chamber. An ignition hole 3 is set on the side of the kiln to realize the decarbonization and dehydration of vanadium clay. At the same time, hot water is provided to the outside through the water circulation pipe 18.

[0033] Section C: Located at the bottom of the vertical kiln, it is 3.2m high, 3m wide, 4m long, and has a volume of 38.4m³. 3 The tunnel kiln is equipped with a transport channel and a conveying device 7. Preferably, the conveying device 7 is made of a furnace chain grate / kiln car. The C area is equipped with a pressure reducing plate 5 and a feeder 4 to provide an interface for the tunnel kiln. Its function is as a transfer area to move the ore (fireball) after self-ignition in the B area to the furnace chain grate or kiln car of the tunnel kiln for easy roasting in the next process.

[0034] Zone D: Located at the front of the tunnel kiln and connected to the vertical kiln, this zone features a furnace chain conveyor or kiln car installed below the enclosed platform of the tunnel kiln. The distance from the chain conveyor (or kiln car surface) to the kiln chamber ceiling is 2.2m. The zone has a net width of 3m, a length of 72m, and a volume of 475.2m³. 3 Two 54x2 flame guns 9 are set on each side of Zone D, and multiple temperature measuring points 16 are set in the middle of the kiln. Flame nozzles can also be left on it for supplementary firing and temperature increase. The already burned spherical ore is further roasted for a long time, which promotes the oxidation of useful elements in the ore and forms a new soluble compound, which is extracted in the next process. Zone D is also called the roasting zone, which is the core point of the entire pyrometallurgical process. It determines the clinker leaching rate.

[0035] Zone E is the tail end of the tunnel kiln, with a height of 2.2m, a net width of 3m, a length of 27m, and a volume of 178.2m³. 3 It is equipped with an exhaust vent 12, and an exhaust fan 15 is installed on the exhaust vent 12. The transition zone from the end of firing to exiting the kiln is also called the cooling zone.

[0036] Furthermore, a water circulation pipe 18 is provided on the inner wall of the kiln in Zone B. One end of the water circulation pipe 18 is connected to the water supply unit, and the other end of the water circulation pipe 18 is connected to the water user unit, which is used to reuse the waste heat in the kiln and provide hot water to the water user unit.

[0037] Furthermore, the outlet of Zone E is equipped with a 3-6m unloading pool for unloading materials.

[0038] Furthermore, a feeder 4 is provided on the pressure reducing plate 5 to assist in conveying the combusted ore to the tunnel kiln.

[0039] Furthermore, an operating platform 14 is provided outside the feed inlet 1 for lifting the formed raw material and allowing it to enter the top of the vertical kiln through the feed inlet 1.

[0040] Furthermore, the pressure relief plate 5 is an inclined plate support, which plays a guiding role and reduces dust and smoke at the entrance of the vehicle when the ore flows down.

[0041] Furthermore, the direct-heating method of the brick-type roasting tunnel kiln is changed to setting up a fire chamber in the interlayer of the side walls of zones D and E, with a pre-reserved nozzle on the fire chamber to perform thermal radiation roasting of the ore. This can reduce the damage to the ore caused by direct heating. If the kiln chamber is too wide and the radiant heat is insufficient (or the heat measurement does not meet the requirements), a pre-reserved nozzle in the center of the kiln surface can be reserved to supplement the heat and raise the temperature.

[0042] Furthermore, at the bottom of the vertical kiln and tunnel, there is a transport channel approximately 0.8m high, 4m wide, and 105m long, which can be used to install tracked kiln cars. Alternatively, a furnace chain conveyor can be installed to reciprocate the material for roasting, with a material loading height of 2m and a 0.2m space above it for heat, flue gas, and oxygen flow channels. The material cannot be loaded to the top, and the feed chain conveyor is covered by the inclined support plate to prevent oxidation of the inclined plate.

[0043] Working principle: The internal calorific value of the ore is measured. If the calorific value is low, pulverized coal is added. The calorific value of the mixed ore should reach 400 cal / g. Taking vanadium shale as an example, the calorific value is controlled at 450 cal / g, and vanadium oxide ore (without carbon value) is used for mixing. The mixed ore is ground into powder using a crushing and grinding system, with a fineness of about 60% (150 mesh). 5% water is added, sprayed, stirred, and shaped into flat spheres with a diameter of 25mm. The ore spheres are then lifted by a bucket elevator to the operating platform 14 at the top of the vertical kiln and enter the feed inlet 1 of the vertical kiln. The material is filled to the edge of the inlet, and the feed inlet is closed. The dried material is continuously fed to the self-combustion chamber B under gravity. At the ignition point 3 of the vertical kiln, a spray gun is inserted to ignite the ore. After burning for 10-13 hours, the material is fed from the top and discharged from the bottom at a depth of 18m. 3 The self-ignited ore (fireball) is transferred from Zone C to the grate or kiln car of the tunnel kiln for subsequent roasting. The vertical kiln produces 18m³ of ore. 3 The material enters the tunnel kiln. Twenty of the nine torches on both sides of the kiln are ignited for roasting. After one hour, more material is fed in. The kiln car or grate advances 3 meters, and eight more torches are ignited. This process is repeated until the tunnel kiln is 72 meters deep. After this, the kiln section stops roasting, and the ore enters cooling zone D. The torches at the front remain lit, maintaining a furnace temperature of 900°C and a kiln chamber temperature of 850±20°C. The final 27-meter section of the tunnel kiln has nine cooling zones, providing 6-8 hours to cool the ore. A sealed small silo is installed at the kiln outlet to supply material to the ball mill. The ground powder enters the clinker silo for leaching. This process reduces eleven steps in the original brick-making section, including mixing, extruding, cutting strips, cutting blanks, stacking blanks, transferring, drying, transferring, roasting, transferring, and breaking bricks. This reduces equipment investment, installation costs, and saves personnel and energy. In the roasting section, the tunnel kiln length is reduced, 120 kiln cars are eliminated, and the brick-breaking process and investment are reduced.

[0044] The L-type mineral roasting kiln described above is an organic combination of vertical kiln and tunnel kiln. It overcomes the shortcomings of vertical kiln single-firing, such as insufficient firing time, low output, and low yield. It also overcomes the disadvantages of tunnel kiln single-firing, which requires shaping the ore into bricks, involves multiple processes, a long kiln body, high costs, and large investments.

[0045] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An L-shaped mineral roasting kiln, characterized in that, Including vertical kilns and tunnel kilns; The vertical kiln includes: Zone A is located on the upper part of the vertical kiln. A flue (2) is provided on the top of the kiln in Zone A. A second smoke extractor (17) is provided at the outer end of the flue (2). A feed inlet (1) is provided on the right side of Zone A. The feed inlet (1) is equipped with a fireproof sealing door. Zone B is located in the middle of the vertical kiln. A self-ignition chamber temperature measuring point (19) is set on the side of the kiln in Zone B, and a manual inspection port (13) is set on the side of the kiln. A fireproof and explosion-proof viewing mirror is installed in the manual inspection port (13), and an ignition hole (3) is set on the side of the kiln in Zone B. Zone C: It is located at the bottom of the vertical kiln, and a transport channel is set inside it. The transport channel is equipped with a conveying device (7), and a pressure reducing plate (5) and a feeder (4) are set inside Zone C to provide an interface for the tunnel kiln. The tunnel kiln includes: Zone D: It is located at the front section of the tunnel kiln and is connected to the vertical kiln. Several flame guns (9) are set on both sides of the kiln in Zone D, and multiple temperature measuring points (16) are set in the middle of the top of the kiln in Zone D. Zone E is located at the tail end of the tunnel kiln. An exhaust port (12) is provided inside the kiln in Zone E, and an exhaust fan (15) is provided on the exhaust port (12).

2. The L-type mineral roasting kiln as described in claim 1, characterized in that: A water circulation pipe (18) is provided on the inner wall of the kiln in Zone B. One end of the water circulation pipe (18) is connected to the water supply unit, and the other end of the water circulation pipe (18) is connected to the water user unit.

3. The L-type mineral roasting kiln as described in claim 1, characterized in that: An unloading pool is provided at the outlet of Zone E.

4. The L-type mineral roasting kiln as described in claim 1, characterized in that: A feeder (4) is provided on the pressure reducing plate (5).

5. An L-shaped mineral roasting kiln as described in claim 1, characterized in that: An operating platform (14) is provided outside the feed inlet (1).

6. The L-type mineral roasting kiln as described in claim 1, characterized in that: The pressure relief plate (5) is supported by an inclined plate.

7. An L-shaped mineral roasting kiln as described in claim 1, characterized in that: Fire chambers are installed in the interlayer between the side walls of areas D and E, and flame nozzles are reserved on the fire chambers.

Images