A roasting device and roasting process for preparing molybdenum concentrate

Abstract

The invention discloses a roasting device and a roasting process for preparing molybdenum concentrate in the technical field of molybdenum metal roasting. The device comprises a roasting furnace, wherein a cavity is arranged in the roasting furnace, a stirring rake is arranged in the cavity, and a central axis is rotatably arranged in the roasting furnace: a branch of the stirring rake is provided with a detachable cleaning structure, and a detachable positioning guide structure is arranged in the roasting furnace; a connecting ring is arranged in the cavity, and a guide pin slidably arranged with a movable groove is fixedly arranged on the inner wall of the stirring rake; a driving source for driving the central axis to rotate is installed in the roasting furnace; the cleaning structure comprises: a sliding sleeve, which slides with the stirring rake and is detachable; a clearance piece, which slides horizontally with the sliding sleeve; a cleaning scraper, which is rotatably arranged with the clearance piece, and the cleaning scraper is provided with a clearance groove; a pretreatment scraper, which is rotatably arranged with the cleaning scraper, and when the roasting is completed and the residual temperature of the roasting furnace still exists, the pretreatment scraper is first used for pretreatment, and then the compacted residual material is scraped off by the cleaning scraper, so that the cleaning difficulty after the residual material is completely compacted can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of molybdenum metal roasting, and in particular to a roasting device and a roasting process for preparing molybdenum concentrate. Background Art

[0002] Molybdenum concentrate roasting is an important part of the chemical processing of molybdenum ore. Its main purpose is to oxidize molybdenum disulfide (MoS2) in molybdenum concentrate into molybdenum trioxide (MoO3) and sulfur dioxide (SO2) so as to prepare various molybdenum compounds or ferromolybdenum in the future. The multi-hearth furnace roasting method has a relatively simple structure, high degree of mechanization, large production capacity, good desulfurization effect, high product quality, and low sulfur content in roasted sand. It has become the most widely used molybdenum concentrate roasting process at home and abroad.

[0003] When molybdenum concentrate is roasted in a multi-chamber furnace, the temperature of the molybdenum concentrate at the bottom of the chamber is likely to be too high due to the heat released by the oxidation reaction of the molybdenum concentrate, which in turn causes the molybdenum concentrate at the bottom of the chamber to melt and sinter into agglomerates, which is not only not conducive to operation but also prevents the sintered material from being fully oxidized. The existing roasting device multi-chamber furnace (i.e. roasting device) mostly waits for the temperature in the chamber to drop to room temperature and cleans it manually or with its assistance. However, after the melted and sintered material cools, it becomes agglomerated and its hardness increases, making it very difficult to clean and the cleaning speed is slow. Summary of the invention

[0004] The technical problem of the present invention is to provide a roasting device and a roasting process for preparing molybdenum concentrate. After roasting is completed and the residual temperature of the roasting furnace still exists, pretreatment is first performed by a pretreatment scraper, and then the compacted residual material is scraped off by a cleaning scraper, which can reduce the difficulty of cleaning the residual material after it is completely compacted.

[0005] To achieve the above object, the present invention provides the following technical solution: a roasting device for preparing molybdenum concentrate, comprising a roasting furnace, wherein a plurality of cavities are arranged in the roasting furnace, each of the cavities is provided with a stirring rake, and a central shaft for driving the stirring rake to rotate is coaxially arranged in the roasting furnace:

[0006] The stirring rake has several branches, and each branch is equipped with a detachable cleaning structure. A detachable positioning and guiding structure is provided in the roasting furnace, and the positioning and guiding structure is used for positioning and lifting the stirring rake, and also for guiding the cleaning structure;

[0007] The cavity is provided with a connecting ring fixed to the central axis, the side wall of the connecting ring is provided with an L-shaped movable groove, and the inner wall of the stirring rake is provided with a guide pin slidably arranged with the movable groove; the roasting furnace is provided with a driving source for driving the central axis to rotate;

[0008] The cleaning structure comprises:

[0009] A sliding sleeve, which slides with the stirring rake and is detachably arranged;

[0010] A giving way piece, arranged to slide transversely with the sliding sleeve;

[0011] A cleaning scraper is rotatably arranged with the yielding member, and the cleaning scraper is provided with a yielding groove;

[0012] The pre-treatment scraper and the cleaning scraper are set to rotate.

[0013] As a further solution of the present invention, a control groove is provided at the hinge between the sliding sleeve and the pretreatment scraper, and the pretreatment scraper is alternately provided with straight-row rakes and buffer grooves at one end away from the sliding sleeve, and the buffer grooves correspond to the motion trajectory of the rake teeth of the stirring rake, and the motion trajectory of the straight-row rake is between the motion trajectory of the rake teeth of the stirring rake.

[0014] As a further solution of the present invention, the positioning guide structure includes:

[0015] Brackets are arranged on both sides of the stirring rake branches;

[0016] A wedge-shaped block is slidably arranged on the bracket, and a top of the wedge-shaped block is provided with an inclined portion and a horizontal portion;

[0017] A threaded rod is rotatably disposed in the bracket and is threadedly connected to the wedge block;

[0018] The transmission member is installed at the outer end of the bracket and is used to drive the threaded rod to rotate synchronously.

[0019] As a further solution of the present invention, the positioning guide structure also includes a guide frame, which is provided with a guide groove that can be plugged into the stirring rake branch, an arc-shaped guide strip is fixedly provided at the inner end of the guide frame, and a limit plate is fixedly provided at the middle position of the top of the guide frame.

[0020] As a further solution of the present invention, the central axis and the stirring rake are both provided with air passages, an air cavity is provided between the connecting ring and the central axis, an air hole 1 is provided at the top of the vertically arranged end of the movable groove, and an air hole 2 is provided on the guide pin, and an air inlet end of the air hole 2 opens toward the side of the vertically arranged movable groove; a conduit is rotatably provided at the top of the central axis, an air inlet is provided on the side wall of the central axis, and an air outlet is provided at the bottom of the stirring rake.

[0021] As a further solution of the present invention, a limit pin is slidably provided on the outer side of the top of the sliding sleeve, a chamfer is provided on the inner bottom of the limit pin, and a limit groove matching the limit pin is provided on the outer side of the top of the stirring rake.

[0022] As a further solution of the present invention, the bottom of the cavity is provided with an overflow groove, and the overflow grooves are alternately arranged in the middle and the outer side of the bottom of the cavity from top to bottom.

[0023] As a further solution of the present invention, a discharging area is provided at the bottom of the roasting furnace.

[0024] A roasting process for preparing molybdenum concentrate, the specific steps are as follows:

[0025] Step 1: Roasting process: the molybdenum concentrate powder poured from the top of the roasting furnace is stirred by a stirring rake. The molybdenum concentrate powder passes through each cavity from top to bottom and reacts with the oxygen-containing gas until it falls to the bottom of the roasting furnace. The molybdenum concentrate powder is preheated to remove water, roasted to remove water, deeply oxidized and cooled to complete the roasting of the molybdenum ore;

[0026] Step 2: Positioning process: open the furnace door on the side wall of the cavity, insert the positioning guide structure into the cavity where the slag needs to be cleaned, and the positioning guide structure positions one of the branches of the stirring rake and lifts it, so that the teeth of the stirring rake are separated from the bottom of the cavity;

[0027] Step 3: During the installation process, the cleaning structure is inserted along the positioning guide structure and installed on the stirring rake. The positioning guide structure is taken out, and the stirring rake falls naturally. After the cleaning scraper contacts the bottom of the cavity, it rotates and bypasses the rake teeth of the stirring rake. After the rake teeth of the stirring rake contact the bottom of the cavity, the installation of the cleaning structure is completed;

[0028] Step 4: During the cleaning process, the central shaft drives the cleaning scraper to rotate. The bottom of the cleaning scraper is acted upon by the direction of the residual material, so that it maintains a rotation trend. The harder the residual material, the stronger the rotation trend of the cleaning scraper, so that it can scrape off the harder residual material. The cleaning scraper is slightly deformed, so that the clearance groove directly contacts the palladium claw, and the palladium claw supports the cleaning scraper, increasing the cleaning ability of the cleaning scraper;

[0029] Step 5: Disassembly process: wait for the temperature of the roasting furnace to drop to room temperature, remove the cleaning structure from the stirring rake and clean the cleaning structure.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] Through the rotation of the stirring rake, the pretreatment scraper is subject to resistance from the bottom of the cavity, the pretreatment scraper rotates around the inner side and the hinge with the cleaning scraper, the cleaning scraper detaches from the bottom of the cavity, and only the bottom of the pretreatment scraper contacts the cavity, the pretreatment scraper performs preliminary scraping of the residual material at the bottom of the cavity, when encountering harder residual material, the cleaning scraper can rotate counterclockwise to avoid damage to the pretreatment scraper, the pretreatment scraper scrapes away the residual powder and residue with low hardness remaining at the bottom of the cavity; the stirring rake rotates in the opposite direction, the end of the cleaning scraper falls down, during the rotation of the cleaning scraper, the bottom is subjected to the directional force of the residual material, so that it maintains the rotation trend, the greater the hardness of the residual material, the stronger the rotation trend of the cleaning scraper, so that it can scrape the harder residual material, the cleaning scraper is slightly deformed, so that the give way groove is directly in contact with the palladium claw, the palladium claw supports the cleaning scraper, and increases the cleaning ability of the cleaning scraper.

[0032] The stirring rake is positioned and raised by the positioning guide structure, so that the teeth of the stirring rake are separated from the bottom of the cavity, which facilitates the cleaning structure to be inserted and installed on the stirring rake. After the cleaning structure is installed, the positioning guide structure is taken out, the stirring rake falls naturally, and after the cleaning scraper contacts the bottom of the cavity, it rotates and bypasses the teeth of the stirring rake. After the teeth of the stirring rake contact the bottom of the cavity, it facilitates the rapid installation of the cleaning structure. The cleaning structure is installed after roasting to avoid the high temperature in the roasting process causing creep of the parts in the cleaning structure and reducing the service life of the parts. It can also prevent the molybdenum concentrate from sticking to the cleaning structure and increasing the operating resistance of the cleaning structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0034] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0035] Figure 2 It is a schematic diagram of the overall cross-sectional structure of the present invention;

[0036] Figure 3 This is a schematic diagram of the structure of the central axis and its connection relationship in the present invention;

[0037] Figure 4 For the present invention Figure 3 The enlarged structural diagram at A in the middle;

[0038] Figure 5 It is a schematic diagram of the cleaning structure and its connection relationship structure of the present invention;

[0039] Figure 6This is a schematic diagram of the explosion structure of the cleaning structure of the present invention;

[0040] Figure 7 For the present invention Figure 6 The enlarged structural diagram at B in the middle;

[0041] Figure 8 This is a schematic diagram of the planar structure of the guide frame and its connection relationship of the present invention;

[0042] Fig. 9 A schematic diagram of the motion trajectory of the cleaning structure during installation of the present invention;

[0043] Fig.10 A schematic diagram of the motion trajectory of the cleaning structure during the cleaning process of the present invention;

[0044] Fig.11 A schematic diagram of the support and its connection relationship of the present invention;

[0045] Fig.12 For the present invention Fig.11 The enlarged structural diagram at C in the middle;

[0046] Fig.13 This is a schematic diagram of the guide frame structure of the present invention;

[0047] Fig.14 It is a schematic diagram of the process flow of the present invention;

[0048] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0049] 1. roasting furnace; 11. driving source; 12. unloading area; 2. cavity; 21. overflow trough; 3. stirring rake; 31. guide pin; 32. limit pin; 33. control slot; 34. air outlet; 4. central axis; 41. connecting ring; 42. movable slot; 43. airway; 44. air cavity; 45. conduit; 46. air hole 1; 47. air hole 2; 48. air inlet; 5. cleaning structure; 51. sliding sleeve; 52. giving way; 53. cleaning scraper; 54. giving way slot; 55. pretreatment scraper; 56. limiting slot; 57. straight row rake; 58. buffer slot; 6. positioning guide structure; 61. bracket; 62. wedge block; 63. inclined part; 64. horizontal part; 65. threaded rod; 66. transmission part; 7. guide frame; 71. guide slot; 72. guide strip; 73. limiting plate. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] See also Figure 1-14 The present invention provides a technical solution: a roasting device for preparing molybdenum concentrate, comprising a roasting furnace 1, a plurality of cavities 2 are arranged in the roasting furnace 1, stirring rakes 3 are arranged in each cavity 2, and a central shaft 4 for driving the stirring rakes 3 to rotate is coaxially arranged in the roasting furnace 1:

[0052] The stirring rake 3 has several branches, and each branch is equipped with a detachable cleaning structure 5. A detachable positioning guide structure 6 is provided in the roasting furnace 1, and the positioning guide structure 6 is used for positioning and lifting the stirring rake 3, and is also used for guiding the cleaning structure 5. When the molybdenum concentrate is roasted, the ground molybdenum concentrate is poured from the top of the roasting furnace 1, and is stirred by the stirring rake 3. The molybdenum concentrate powder stays in each layer of the cavity 2 for a period of time and then falls into the next layer until it falls to the bottom of the roasting furnace 1. The molybdenum concentrate powder is preheated to remove water, roasted to remove water, deeply oxidized and cooled from top to bottom, and the oxygen-containing gas is input into the cavity 2 of each layer through the central axis 4; the cooled molybdenum ore is taken out from the bottom of the roasting furnace 1 to complete the roasting of the molybdenum ore;

[0053] Before the roasting furnace 1 is completely cooled, the furnace doors of the side walls of each layer of the cavity 2 are opened in turn. At the same time, the positioning guide structure 6 is inserted into the cavity 2 where the slag needs to be cleaned. The positioning guide structure 6 positions one of the branches of the stirring rake 3 and lifts it, so that the teeth of the stirring rake 3 are separated from the bottom of the cavity 2. At this time, the cleaning structure 5 is inserted along the positioning guide structure 6, so that the cleaning structure 5 is sleeved on the branch of the stirring rake 3, and the cleaning structure 5 is installed on the stirring rake 3. The number of cleaning structures 5 installed in each cavity 2 is added or reduced as appropriate according to the amount of residual material in the cavity 2. It is best to install the cleaning structures 5 symmetrically.

[0054] The cavity 2 is provided with a connecting ring 41 fixed to the central axis 4, and a movable groove 42 of an L-shaped structure is provided on the side wall of the connecting ring 41. The movable groove 42 can make the stirring rake 3 rotate relative to the central axis 4, and a guide pin 31 is fixed on the inner wall of the stirring rake 3 and is slidably arranged with the movable groove 42; a driving source 11 for driving the central axis 4 to rotate is installed in the roasting furnace 1, and when the guide pin 31 moves to the bottom of the vertical end of the movable groove 42, the stirring rake 3 can move up and down;

[0055] Cleanup structure 5 includes:

[0056] The sliding sleeve 51 slides with the stirring rake 3 and is detachably arranged;

[0057] The giving way member 52 is arranged to slide transversely with the sliding sleeve 51;

[0058] The cleaning scraper 53 is rotatably arranged with the giving way member 52, and the cleaning scraper 53 is provided with a giving way groove 54;

[0059] The pre-treatment scraper 55 is rotatably arranged with the cleaning scraper 53;

[0060] It should be noted that the cleaning structure 5 is installed after roasting to avoid the high temperature during roasting causing the parts in the cleaning structure 5 to creep and reduce the service life of the parts; it can also prevent the molybdenum concentrate from adhering to the cleaning structure 5 and increase the running resistance of the cleaning structure 5;

[0061] Install cleaning structure 5, see Figure 5-Figure 9 The sliding sleeve 51 moves along the positioning guide structure 6 and is inserted into the branch of the stirring rake 3. After the sliding sleeve 51 and the branch are set, the sliding sleeve 51 is fixed to the branch. At this time, the state of the cleaning structure 5 is as follows: Figure 8 As shown, the restriction on the cleaning scraper 53 is removed, and the cleaning scraper 53 rotates counterclockwise under the action of gravity. Since the pre-treatment scraper 55 is arranged on one side of the cleaning scraper 53, the cleaning scraper 53 deviates to the right side (i.e. Fig. 9 The cleaning scraper 53 is located in the middle), the positioning guide structure 6 is taken out, the stirring rake 3 falls naturally, the cleaning scraper 53 first contacts the bottom of the cavity 2, the cleaning scraper 53 rotates counterclockwise, the stirring rake 3 passes through the clearance groove 54, and the teeth of the stirring rake 3 contact the bottom of the cavity 2, and the installation of the cleaning structure 5 is completed;

[0062] During the pretreatment of molybdenum concentrate residue, the central axis 4 drives the connecting ring 41 to rotate, and the connecting ring 41 and the guide pin 31 are displaced. After the guide pin 31 moves from the bottom of the vertical end of the movable groove 42 to the end of the horizontal section, the guide pin 31 drives the stirring rake 3 to rotate, and the stirring rake 3 drives the sliding sleeve 51 to rotate. The sliding sleeve 51 drives the top of the cleaning scraper 53 to rotate through the giving way 52, and the cleaning scraper 53 drives the inner side of the pretreatment scraper 55 to rotate. The outer end of the pretreatment scraper 55 is subject to the resistance of the bottom of the cavity 2, and the pretreatment scraper 55 rotates around the hinge between the inner side and the cleaning scraper 53, and the cleaning scraper 53 is separated from the bottom of the cavity 2, and only the bottom of the pretreatment scraper 55 is in contact with the cavity 2 (the pretreatment scraper 55 Fig.10 In the solid line state), the pre-processing scraper 55 preliminarily scrapes off the residual material at the bottom of the cavity 2. When encountering relatively hard residual material, the cleaning scraper 53 can rotate counterclockwise to avoid damage to the pre-processing scraper 55. The pre-processing scraper 55 scrapes off the residual powder and the residue with low hardness at the bottom of the cavity 2;

[0063] The molybdenum concentrate residue is further processed, the central axis 4 rotates in the opposite direction, the pretreatment scraper 55 rotates clockwise, the give-way piece 52 slides, so that the cleaning scraper 53 approaches the palladium claw, and the gap between the give-way groove 54 and the palladium claw is reduced, and the bottom of the cleaning scraper 53 scrapes off the harder residual material in the cavity 2. At this time, the bottom of the cleaning scraper 53 is subjected to the directional force of the residual material, so that it maintains a clockwise rotation trend. The harder the residual material, the stronger the clockwise rotation trend of the cleaning scraper 53, so that it can scrape off the harder residual material; in addition, the cleaning scraper 53 can detect slight deformation, so that the give-way groove 54 is in direct contact with the palladium claw, and the palladium claw supports the cleaning scraper 53, thereby increasing the cleaning ability of the cleaning scraper 53.

[0064] As a further solution of the present invention, a control groove 33 is provided at the hinge between the sleeve 51 and the pre-treatment scraper 55, and a straight-row rake 57 and a buffer groove 58 are alternately provided at one end of the pre-treatment scraper 55 away from the sleeve 51, and the buffer groove 58 corresponds to the rake teeth motion trajectory of the stirring rake 3, and the motion trajectory of the straight-row rake 57 is between the rake teeth motion trajectory of the stirring rake 3;

[0065] For details, see Figure 6 and Figure 7 The control groove 33 is used to limit the rotation range of the pre-treatment scraper 55 , and the straight-row rake 57 can scrape off the residual material between the rake tooth tracks, and the accumulated residual material can pass through the pre-treatment scraper 55 from the buffer groove 58 to reduce the movement resistance of the pre-treatment scraper 55 .

[0066] As a further solution of the present invention, the positioning guide structure 6 includes:

[0067] Brackets 61 are arranged on both sides of the branches of the stirring rake 3;

[0068] A wedge block 62 is slidably disposed on the bracket 61, and an inclined portion 63 and a horizontal portion 64 are disposed on the top of the wedge block 62;

[0069] The threaded rod 65 is rotatably disposed in the bracket 61 and is threadedly connected to the wedge block 62;

[0070] The transmission member 66 is mounted on the outer end of the bracket 61 and is used to drive the threaded rod 65 to rotate synchronously;

[0071] For details, see Figure 5 , Fig.11 and Fig.12, fix the bracket 61 and the roasting furnace 1 relatively, the transmission member 66 drives the threaded rod 65 to rotate, the threaded rod 65 drives the wedge block 62 to approach the stirring rake 3, and the inclined portion 63 of the wedge block 62 contacts the branch of the stirring rake 3 and pushes the stirring rake 3 to rotate until both wedge blocks 62 are in contact with the branch of the stirring rake 3, the stirring rake 3 moves relative to the wedge block 62, and moves from the inclined portion 63 to the horizontal portion 64, the stirring rake 3 is lifted after being positioned, and the rake teeth are separated from the bottom of the cavity 2, which facilitates the installation of the cleaning structure 5.

[0072] As a further solution of the present invention, the positioning guide structure 6 also includes a guide frame 7, the guide frame 7 is provided with a guide groove 71 capable of being plugged into the branch of the stirring rake 3, the inner end of the guide frame 7 is fixed with an arc-shaped guide strip 72, and a limit plate 73 is fixed at the middle position of the top of the guide frame 7;

[0073] For details, see Figure 5 and Fig.13 , align the guide bar 72 with the rake teeth and then insert it. After the guide bar 72 contacts the rake teeth, the guide frame 7 moves, so that the stirring rake 3 enters the vertical section of the guide groove 71. The guide groove 71 and the stirring rake 3 are relatively fixed along the width direction of the guide groove 71. The top of the guide groove 71 guides the sliding sleeve 51, and the sliding sleeve 51 can be easily mounted on the stirring rake 3. Since the sliding sleeve 51 and the guide frame 7 are relatively long, the cleaning structure 5 can be installed at a position far away from the roasting furnace 1, which can reduce the impact of high temperature on the installers and equipment.

[0074] As a further solution of the present invention, the central axis 4 and the stirring rake 3 are both provided with an air passage 43, an air cavity 44 is provided between the connecting ring 41 and the central axis 4, an air hole 1 46 is provided at the top of the vertically arranged end of the movable groove 42, and an air hole 2 47 is provided at the guide pin 31, and the air inlet end opening of the air hole 2 47 faces the side of the vertically arranged movable groove 42; a guide tube 45 is rotatably provided at the top of the central axis 4, an air inlet 48 is provided at the side wall of the central axis 4, and an air outlet 34 is provided at the bottom of the stirring rake 3;

[0075] For details, see Figure 2-Figure 4 The oxygen-containing gas is injected into the central axis 4 through the conduit 45, and passes through the air inlet 48, the air cavity 44, the movable groove 42, the air hole 1 46, the air hole 2 47, the stirring rake 3 in sequence, and finally enters each cavity 2 from the air outlet 34, so that the molybdenum concentrate powder and oxygen can fully react; in addition, when the guide pin 31 moves to the vertical end of the movable groove 42, the oxygen-containing gas stops entering the cavity 2.

[0076] As a further solution of the present invention, a limit pin 32 is slidably arranged on the outer side of the top of the sliding sleeve 51, a chamfer is arranged on the inner bottom of the limit pin 32, and a limit groove 56 matching the limit pin 32 is opened on the outer side of the top of the stirring rake 3;

[0077] For details, see Figure 2The limiting pin 32 passes over the limiting groove 56 through chamfering and is plugged therein, so that the sliding sleeve 51 and the stirring rake 3 can be relatively fixed, reducing the difficulty of fixing the sliding sleeve 51.

[0078] As a further solution of the present invention, the bottom of the cavity 2 is provided with an overflow groove 21, and the overflow groove 21 is alternately arranged in the middle and the outer side of the bottom of the cavity 2 from top to bottom;

[0079] For details, see Figure 5 The overflow chute 21 can move the molybdenum concentrate in the adjacent cavity 2 in the opposite direction, thereby increasing the roasting time of the molybdenum concentrate and allowing it to be fully roasted.

[0080] As a further solution of the present invention, a discharge area 12 is provided at the bottom of the roasting furnace 1 .

[0081] A roasting process for preparing molybdenum concentrate, the specific steps are as follows:

[0082] Step 1: Roasting process, the molybdenum concentrate powder poured from the top of the roasting furnace 1 is stirred by a stirring rake 3, and the molybdenum concentrate powder passes through each cavity 2 from top to bottom in sequence, and reacts with the oxygen-containing gas until it falls to the bottom of the roasting furnace 1. The molybdenum concentrate powder is sequentially preheated to remove water, roasted to remove water, deeply oxidized and cooled to complete the roasting of the molybdenum ore;

[0083] Step 2: Positioning process: open the furnace door on the side wall of the cavity 2, insert the positioning guide structure 6 into the cavity 2 where the slag needs to be cleaned, and the positioning guide structure 6 positions one of the branches of the stirring rake 3 and lifts it, so that the rake teeth of the stirring rake 3 are separated from the bottom of the cavity 2;

[0084] Step 3: During the installation process, the cleaning structure 5 is inserted along the positioning guide structure 6 and installed on the stirring rake 3. The positioning guide structure 6 is taken out, and the stirring rake 3 falls naturally. After the cleaning scraper 53 contacts the bottom of the cavity 2, it rotates and bypasses the rake teeth of the stirring rake 3. After the rake teeth of the stirring rake 3 contact the bottom of the cavity 2, the installation of the cleaning structure 5 is completed;

[0085] Step 4: During the cleaning process, the central shaft 4 drives the cleaning scraper 53 to rotate. The bottom of the cleaning scraper 53 is acted upon by the direction of the residual material, so that it maintains a rotation trend. The greater the hardness of the residual material, the stronger the rotation trend of the cleaning scraper 53, so that it can scrape off the harder residual material. The cleaning scraper 53 is slightly deformed, so that the clearance groove 54 is directly in contact with the palladium claw, and the palladium claw supports the cleaning scraper 53, thereby increasing the cleaning ability of the cleaning scraper 53.

[0086] Step 5: Disassembly process: wait for the temperature of the roasting furnace 1 to drop to room temperature, remove the cleaning structure 5 from the stirring rake 3 and clean the cleaning structure 5.

Claims

1. A roasting device for preparing molybdenum concentrate, comprising a roasting furnace (1), wherein a plurality of cavities (2) are arranged in the roasting furnace (1), wherein stirring rakes (3) are arranged in each of the cavities (2), and a central shaft (4) for driving the stirring rakes (3) to rotate is coaxially arranged in the roasting furnace (1), wherein the central shaft (4) is characterized in that: The stirring rake (3) has a plurality of branches, and each branch is equipped with a detachable cleaning structure (5). A detachable positioning guide structure (6) is provided in the roasting furnace (1). The positioning guide structure (6) is used for positioning and lifting the stirring rake (3) and for guiding the cleaning structure (5); The cavity (2) is provided with a connecting ring (41) fixed to the central axis (4), the side wall of the connecting ring (41) is provided with an L-shaped movable groove (42), and the inner wall of the stirring rake (3) is fixed with a guide pin (31) slidably arranged with the movable groove (42); the roasting furnace (1) is installed with a driving source (11) for driving the central axis (4) to rotate; The cleaning structure (5) comprises: A sliding sleeve (51) is detachably arranged to slide with the stirring rake (3); A clearance member (52) is arranged to slide transversely with the sliding sleeve (51); A cleaning scraper (53) is rotatably arranged with the clearance member (52), and the cleaning scraper (53) is provided with a clearance groove (54); The pre-treatment scraper (55) is rotatably arranged with the cleaning scraper (53); A control groove (33) is provided at the hinged joint between the sliding sleeve (51) and the pre-treatment scraper (55); a straight-row rake (57) and a buffer groove (58) are alternately provided at one end of the pre-treatment scraper (55) that is alternately away from the sliding sleeve (51); the buffer groove (58) corresponds to the motion trajectory of the rake teeth of the stirring rake (3); and the motion trajectory of the straight-row rake (57) is between the motion trajectory of the rake teeth of the stirring rake (3); The positioning guide structure (6) comprises: A bracket (61) is arranged on both sides of the branch of the stirring rake (3); A wedge-shaped block (62) is slidably disposed on the bracket (61), wherein the top of the wedge-shaped block (62) is provided with an inclined portion (63) and a horizontal portion (64); A threaded rod (65) is rotatably disposed in the bracket (61) and is threadably connected to the wedge block (62); A transmission member (66) is mounted on the outer end of the bracket (61) and is used to drive the threaded rod (65) to rotate synchronously; The positioning guide structure (6) further comprises a guide frame (7), the guide frame (7) being provided with a guide groove (71) capable of being plugged into a branch of the stirring rake (3), an arc-shaped guide strip (72) being fixedly provided at the inner end of the guide frame (7), and a limit plate (73) being fixedly provided at the middle position of the top of the guide frame (7).

2. A roasting device for preparing molybdenum concentrate according to claim 1, characterized in that: The central axis (4) and the stirring rake (3) are both provided with an air passage (43); an air cavity (44) is provided between the connecting ring (41) and the central axis (4); a first air hole (46) is provided at the top of the vertically arranged end of the movable groove (42); a second air hole (47) is provided at the guide pin (31); an air inlet end of the second air hole (47) opens toward a side of the vertically arranged movable groove (42); a guide tube (45) is rotatably provided at the top of the central axis (4); an air inlet (48) is provided on the side wall of the central axis (4); and an air outlet (34) is provided at the bottom of the stirring rake (3).

3. A roasting device for preparing molybdenum concentrate according to claim 1, characterized in that: A limit pin (32) is slidably disposed on the outer side of the top of the sliding sleeve (51), a chamfer is disposed on the inner bottom of the limit pin (32), and a limit groove (56) matching the limit pin (32) is provided on the outer side of the top of the stirring rake (3).

4. The roasting device for preparing molybdenum concentrate according to claim 1, characterized in that: The bottom of the cavity (2) is provided with an overflow groove (21), and the overflow grooves (21) are alternately arranged in the middle and the outer side of the bottom of the cavity (2) from top to bottom.

5. A roasting device for preparing molybdenum concentrate according to claim 1, characterized in that: The bottom of the roasting furnace (1) is provided with a discharge area.

6. A roasting process for preparing molybdenum concentrate, applicable to a roasting device for preparing molybdenum concentrate according to any one of claims 1 to 5, characterized in that: The specific steps of the roasting process for preparing the molybdenum concentrate are as follows: Step 1: Roasting process, the molybdenum concentrate powder poured from the top of the roasting furnace (1) is stirred by a stirring rake (3), and the molybdenum concentrate powder passes through each cavity (2) from top to bottom and reacts with the oxygen-containing gas until it falls to the bottom of the roasting furnace (1). The molybdenum concentrate powder is sequentially preheated to remove water, roasted to remove water, deeply oxidized and cooled to complete the roasting of the molybdenum ore; Step 2: Positioning process, opening the furnace door of the side wall of the cavity (2), inserting the positioning guide structure (6) into the cavity (2) that needs to be cleaned of slag, and positioning the positioning guide structure (6) to position one of the branches of the stirring rake (3) and lift it, so that the rake teeth of the stirring rake (3) are separated from the bottom of the cavity (2); Step 3: During the installation process, the cleaning structure (5) is inserted along the positioning guide structure (6), and the cleaning structure (5) is installed on the stirring rake (3). The positioning guide structure (6) is removed, and the stirring rake (3) falls naturally. After the cleaning scraper (53) contacts the bottom of the cavity (2), it rotates and bypasses the rake teeth of the stirring rake (3). After the rake teeth of the stirring rake (3) contact the bottom of the cavity (2), the installation of the cleaning structure (5) is completed. Step 4: During the cleaning process, the central shaft (4) drives the cleaning scraper (53) to rotate. The bottom of the cleaning scraper (53) is subjected to the directional force of the residual material, so that it maintains a rotational trend. The greater the hardness of the residual material, the stronger the rotational trend of the cleaning scraper (53), so that it can scrape off the harder residual material. The cleaning scraper (53) is slightly deformed, so that the clearance groove (54) directly contacts the palladium claw, and the palladium claw supports the cleaning scraper (53), thereby increasing the cleaning ability of the cleaning scraper (53); Step 5: Disassembly process: wait for the temperature of the roasting furnace (1) to drop to room temperature, remove the cleaning structure (5) from the stirring rake (3) and clean the cleaning structure (5).

Images