A kind of drying equipment for extracting lithium by sulfuric acid method

Abstract

The present invention relates to the technical field of lithium extraction, and in particular to a drying device for lithium extraction by a sulfuric acid method, comprising a rotary dryer, wherein the rotary dryer comprises a continuously rotating rotary drying drum, wherein a plurality of lifting plates are fixedly installed in the rotary drying drum, a dispersion unit is installed on the left side of the rotary drying drum, and a screening and drying unit is installed on the right side of the rotary drying drum. The present invention is used for drying raw materials obtained by mixing lepidolite and concentrated sulfuric acid, and the present invention can disperse thick or pasty raw materials, prevent the thick or pasty raw materials from accumulating into large agglomerates, ensure sufficient and uniform contact between the raw materials and hot air, thereby ensuring the drying effect of the raw materials and the quality of the dried products, and at the same time, the present invention can also screen and dry granular raw materials, ensure sufficient contact between the granular raw materials and hot air, thereby ensuring thorough drying of the raw materials.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium extraction, and in particular to drying equipment for extracting lithium using a sulfuric acid method. Background Art

[0002] Lithium extraction by sulfuric acid is an important lithium extraction technology for lithium-containing silicate minerals such as lepidolite. The crushed lepidolite is mixed with concentrated sulfuric acid and then subjected to processes such as roasting, leaching, purification, and lithium precipitation to achieve efficient extraction of lithium. Before roasting the mixture of lepidolite and sulfuric acid, the raw materials usually need to be dried. During drying, the raw materials after the mixture of lepidolite and concentrated sulfuric acid are transformed from the initial thick state to a paste and finally to a granular state, thereby removing free moisture, promoting full contact between sulfuric acid and minerals, and facilitating subsequent processing of the raw materials.

[0003] At present, a rotary dryer is usually used to dry the raw materials obtained by mixing lepidolite and concentrated sulfuric acid. The raw materials are continuously fed into the rotating cylinder of the rotary dryer, and the rotary dryer is controlled to rotate continuously. The air in the rotating cylinder is heated by a hot air unit, so that the hot air dries the raw materials. A lifting plate for lifting and conveying the raw materials is installed in the rotating cylinder, so that the raw materials are fully exposed to the hot air, thereby achieving drying of the raw materials.

[0004] The existing drying process for raw materials obtained by mixing lepidolite and concentrated sulfuric acid has the following problems: since the raw materials are relatively thick and in a paste-like state during the middle stage of drying, the raw materials may accumulate into large agglomerates during the drying process, resulting in insufficient and uniform contact of the raw materials with the hot air, thereby affecting the drying effect of the raw materials and reducing the quality of the dried product; at the same time, when the granular raw materials are picked up and dropped by the scooping plate, a large amount of granular raw materials may accumulate together, resulting in insufficient contact with the hot air, and thus some granular raw materials may not be completely dried. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: a sulfuric acid method lithium extraction drying equipment, including a rotary dryer, the rotary dryer includes a continuously rotating rotary drying drum, a plurality of copying plates are fixedly installed in the rotary drying drum, a dispersion unit is installed on the left side of the rotary drying drum, and a screening drying unit is installed on the right side of the rotary drying drum; the dispersion unit includes a plurality of material-dividing plates fixedly installed in the rotary drying drum, and a material-blocking plate is fixedly installed on both ends of the material-dividing plate. The material-blocking plate and the rotary drying drum are fixed, and the two material-blocking plates are opposite to each other and one end close to the middle of the rotary drying drum is connected by a rotating member. A dispersion plate is installed, which has multiple dispersion holes of a conical structure. The baffle plate is used to cooperate with the material stripping plate to pick up the raw materials, so that the raw materials can only be moved out of the material stripping plate from the dispersion holes of the dispersion plate. The material stripping plate is equipped with a scattering group for scattering the raw materials; the screening and drying unit includes multiple lifting plates fixedly installed in the rotary drying cylinder, and a comb-shaped material distribution plate is fixedly installed on the side of the lifting plate that has the same rotation direction as the rotary drying cylinder and one end close to the middle of the rotary drying cylinder, and a screening group for screening and drying granular raw materials is installed on the lifting plate; the material stripping plates and lifting plates are evenly arranged circumferentially with their corresponding copying plates.

[0006] Preferably, the rotating member includes a rotating shaft rotatably mounted on the two baffle plates, and a torsion spring is connected between the rotating shaft and the two baffle plates, the surface of the rotating shaft is in contact with the side of the material-diverting plate close to the middle of the rotary drying cylinder, the rotating shaft and the dispersion plate are fixedly connected, the dispersion plate is located on the side with the same rotation direction as the material-diverting plate and the rotary drying cylinder, and the dispersion plate is initially arranged perpendicular to the material-diverting plate.

[0007] Preferably, a feed plate is rotatably installed on the left side of the rotary drying drum, a feed port is provided on the feed plate, and the feed plate is fixedly connected to the fixed end of the rotary dryer, an arc-shaped plate is fixedly installed on the upper front part of the right end of the feed plate, and an arc-shaped plate is also distributed inside the rotary drying drum and to the right of the rightmost diverter plate. A plurality of evenly arranged arc-shaped diverter blocks are fixedly installed on the opposite sides of the left and right arc-shaped plates near the middle of the rotary drying drum, and a matching plate with an arc structure is fixedly installed on the end of the arc-shaped plate away from the middle of the rotary drying drum.

[0008] Preferably, the scattering group includes a sliding plate radially slidably mounted on the material stripping plate, and the sliding plate is located at one end of the material stripping plate close to the middle of the rotary drying cylinder, the sliding plate is connected to the material stripping plate through a plurality of return springs evenly arranged on the left and right, a sealing plate is fixedly mounted on the sliding plate, and the sealing plate is in contact with the rotary drying cylinder, and a scattering plate is fixedly mounted on the middle of one side of the sealing plate away from the sliding plate.

[0009] Preferably, a toggle rod is fixedly installed at the left end of the sliding plate located on the far left and the right end of the sliding plate located on the far right, and the toggle rod slides radially through the corresponding material stripping plate and material baffle plate in turn, and one end of the toggle block close to the middle of the rotary drying drum is set as an inclined surface that cooperates with the toggle rod, and a square synchronization rod is fixedly installed between the two adjacent sliding plates on the left and right, and the square synchronization rod slides through its corresponding material stripping plate and material baffle plate.

[0010] Preferably, the side of the material-diverting plate away from the middle of the rotary drying drum is set as a hollow structure, and a positioning plate is radially slidably installed in the hollow structure of the material-diverting plate through a plurality of top springs evenly arranged on the left and right. The positioning plate is provided with a plurality of positioning holes evenly arranged front and back, and the material-diverting plate is provided with a plurality of staggered holes arranged alternately with the positioning holes.

[0011] Preferably, a matching rod is fixedly installed on the middle of the left end of the alignment plate located on the far left and the middle of the right end of the alignment plate located on the far right, and the matching rod slides through the corresponding material shifting plate and material blocking plate in turn, and the lower end of the matching plate is set to an inclined surface that matches the matching rod, and a synchronization plate is fixedly installed between the two adjacent alignment plates on the left and right, and the synchronization plate slides through the corresponding material shifting plate and material blocking plate.

[0012] Preferably, a uniform distribution plate is fixedly installed on the opposite sides of the two material baffle plates, and the uniform distribution plate is located on the side with the same rotation direction as the material diverter plate and the rotary drying drum. A plurality of radially evenly arranged rectangular holes are opened on the uniform distribution plate, and a plurality of radially evenly arranged flow equalizing plate groups are fixedly installed on the material diverter plate and the side facing the flow equalizing plate, and each flow equalizing plate group includes a plurality of flow equalizing plates evenly arranged on the left and right.

[0013] Preferably, two symmetrically arranged baffles are fixedly installed between the lifting plate, the dividing plate and the rotary drying drum, and multiple triangular plates are fixedly installed on the side of the dividing plate away from the middle of the rotary drying drum, and the comb teeth structures of the triangular plates and the dividing plate correspond to each other one by one.

[0014] Preferably, the screening group includes a screening plate fixedly mounted on the side of the lifting plate close to the middle of the rotary drying drum, a plurality of guide grooves evenly arranged on the left and right sides are provided on the side with the same rotation direction as the rotary drying drum, and the positions of the guide grooves correspond one-to-one to the comb holes of the dividing plate, a plurality of screening holes evenly arranged along the length direction of the guide grooves are provided in the guide grooves, and the aperture of the screening holes becomes larger the closer to the middle of the rotary drying drum.

[0015] The beneficial effects of the present invention are: 1. The present invention sets a dispersion unit so that the thick or pasty raw materials will not come into contact with the hot air in the form of accumulation into large agglomerates, so that the thick or pasty raw materials and the hot air are fully and evenly contacted, thereby ensuring the drying effect of the thick or pasty raw materials and the quality of the products after drying. At the same time, the present invention sets a screening and drying unit to screen and dry the granular raw materials, so that the granular raw materials with small particle size can be removed from the screening and drying unit first and fall into the rotary drying drum, thereby preventing the granular raw materials from piling up, making the granular raw materials and the hot air fully contacted, and ensuring that the granular raw materials are thoroughly dried.

[0016] 2. The present invention provides a spreading group to periodically and quickly spread the thick or pasty raw materials toward one end away from the middle of the drying cylinder, so that the thick and pasty raw materials collide with the flow equalizing plate under the rapid spreading action of the spreading group, so that the lumps in the thick or pasty raw materials can be broken under the impact, further ensuring the drying effect of the thick or pasty raw materials, thereby further ensuring the quality of the dried products.

[0017] 3. When the spreading group quickly moves the thick or pasty raw materials, the present invention aligns the alignment holes of the alignment plate and the offset holes of the material-moving plate, so that the moved thick and pasty raw materials can be moved out of the alignment plate. At the same time, the present invention arranges multiple flow-equalizing plates to separate the moved thick and pasty raw materials to the left and right, thereby allowing the thick and pasty raw materials to be quickly moved out of the material-moving plate in the form of smaller agglomerates, thereby achieving rapid drying of the thick or pasty raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and examples.

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0020] Figure 2 It is a schematic diagram of the cutaway three-dimensional structure of the rotary drying drum of the present invention.

[0021] Figure 3 It is a right view of the feed plate, curved plate, toggle block and matching plate located on the left side of the present invention.

[0022] Figure 4 It is a schematic diagram of the cutaway three-dimensional structure of the dispersion unit of the present invention.

[0023] Figure 5 It is a cross-sectional view from a first perspective of the dispersed unit partial structure of the present invention.

[0024] Figure 6 It is a cross-sectional view from a second perspective of the dispersed unit structure of the present invention.

[0025] Figure 7 It is a three-dimensional structural diagram of a partial structure of the screening and drying unit of the present invention.

[0026] Figure 8 It is a first right side view of the present invention with part of the structure cut away.

[0027] Figure 9 The present invention Figure 8 Status diagram during operation.

[0028] Figure 10 It is a second right side view of the present invention with part of the structure cut away.

[0029] Figure 11 The present invention Figure 10 Status diagram during operation.

[0030] Figure 12 It is a left view of the feed plate, curved plate, toggle block, matching plate and rotary drying drum located on the right side of the present invention.

[0031] Reference numerals: 1, rotary dryer; 11, rotary drying drum; 111, feed plate; 112, curved plate; 113, toggle block; 114, matching plate; 12, copying plate; 2, dispersion unit; 21, toggle plate; 211, top extension spring; 212, alignment plate; 213, alignment hole; 214, matching rod; 215, synchronization plate; 216, equalizing plate group; 22, baffle plate; 221, equalizing 2. Distribution plate; 23. Rotating part; 24. Dispersing plate; 25. Dispersing group; 251. Sliding plate; 252. Return spring; 253. Sealing plate; 254. Dispersing plate; 255. Toggle rod; 256. Square synchronization rod; 3. Screening and drying unit; 31. Lifting plate; 311. Baffle; 32. Distributing plate; 321. Triangular plate; 33. Screening group; 331. Screening plate; 332. Screening hole. DETAILED DESCRIPTION

[0032] The embodiments described below are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention. If no specific techniques or conditions are specified in the embodiments, the techniques or conditions described in the literature in the art or the product instructions shall be followed.

[0033] See Figure 1 and Figure 2 A sulfuric acid method lithium extraction drying equipment includes a rotary dryer 1, which includes a continuously rotating rotary drying drum 11. A plurality of lifting plates 12 are fixedly installed in the rotary drying drum 11. The lifting plates 12 are configured as an inclined structure to drive the raw materials to move to the right. A dispersion unit 2 is installed on the left side of the rotary drying drum 11, and a screening and drying unit 3 is installed on the right side of the rotary drying drum 11.

[0034] See Figure 1 and Figure 2 A feed plate 111 is rotatably mounted on the left side of the rotary drying drum 11 , a feed port is provided on the feed plate 111 , and the feed plate 111 is fixedly connected to the fixed end of the rotary dryer 1 .

[0035] It should be noted that the rotary dryer 1 in the present invention also includes a hot air unit, a drive unit and a feed unit. The hot air unit is installed on the outside of the rotary drying cylinder 11. The left side of the rotary drying cylinder 11 is connected to the drive unit, and the left side of the feed plate 111 is connected to the feed unit, and the feed plate 111 is always in a stationary state. By placing the raw materials into the feed unit, the raw materials enter the rotary drying cylinder 11 through the feed port of the feed plate 111, and the right end of the rotary drying cylinder 11 is connected to the external discharge unit. The dried raw material particles are discharged from the rotary drying cylinder 11 through the discharge unit.

[0036] The present invention is used for drying a raw material obtained by mixing lepidolite and concentrated sulfuric acid. The present invention can disperse a thick or pasty raw material, prevent the thick or pasty raw material from accumulating into large agglomerates, ensure that the raw material is fully and evenly contacted with hot air, thereby ensuring the drying effect of the raw material and the quality of the dried product. At the same time, the present invention can also screen and dry granular raw materials, ensure that the granular raw materials are fully contacted with hot air, thereby ensuring that the raw materials are thoroughly dried.

[0037] Specifically, the raw materials are first put into the feeding unit, and the feeding unit feeds the raw materials into the rotary drying drum 11 through the feeding port of the feeding plate 111, and the hot air unit is started to heat the air in the rotary drying drum 11. At the same time, the driving unit is started to drive the rotary drying drum 11 to rotate continuously, so that the rotary drying drum 11 drives the lifting plate 12 to rotate, and the lifting plate 12 lifts the raw materials and drives the raw materials to move to the right. When the raw materials just enter the rotary drying drum 11, the raw materials are thick. The thick raw materials move to the right under the action of the lifting plate 12 and are gradually dried under the action of the hot air. As the thick raw materials are gradually dried, the thick raw materials first gradually turn into a paste and finally into granules.

[0038] When the raw material is in a thick or pasty state, the raw material is located at the corresponding position of the dispersion unit 2, and the continuously rotating rotary drying drum 11 drives the dispersion unit 2 to lift the thick raw material or pasty raw material to a certain height, and then the thick raw material or pasty raw material is removed from the dispersion unit 2 and falls into the rotary drying drum 11 under the action of gravity, and the dispersion unit 2 can disperse the thick raw material or pasty raw material to prevent it from accumulating into large agglomerates, so that the thick raw material or pasty raw material is fully and evenly in contact with the hot air during the falling process. When the raw material is in a granular state, the raw material is located at the corresponding position of the screening and drying unit 3, and the continuously rotating rotary drying drum 11 drives the screening and drying unit 3 to lift the granular raw material to a certain height, and then the granular raw material is removed from the screening and drying unit 3 and falls into the rotary drying drum 11 under the action of gravity, and granular raw materials of different particle sizes can fall from the screening and drying unit 3 one after another, thereby preventing the accumulation of the granular raw material and ensuring that the granular raw material is fully dried.

[0039] See Figure 2 、 Figure 4 、 Figure 5 、 Figure 8 and Figure 9 The dispersing unit 2 includes a plurality of material stripping plates 21 fixedly installed in the rotary drying cylinder 11, and a material baffle plate 22 is fixedly installed on both ends of the left and right ends of the material stripping plate 21. The material baffle plate 22 is fixed between the rotary drying cylinder, and a dispersing plate 24 is installed on the opposite side of the two material baffle plates 22 and one end close to the middle of the rotary drying cylinder 11 through a rotating member 23. A plurality of dispersing holes of a conical structure are opened on the dispersing plate 24. The material baffle plate 22 is used to cooperate with the material stripping plate 21 to pick up the raw materials, and the raw materials can only be moved out of the area of ​​the material stripping plate 21 and the material baffle plate 22 from the dispersing holes of the dispersing plate 24. A dispersing group 25 for dispersing the raw materials is installed on the material stripping plate 21; the material stripping plate 21 and its corresponding copying plate 12 are evenly arranged circumferentially.

[0040] See Figure 5 The rotating member 23 includes a rotating shaft rotatably mounted on the two baffle plates 22, and a torsion spring is connected between the rotating shaft and the two baffle plates 22. The surface of the rotating shaft is in contact with one side of the material-diverting plate 21 close to the middle of the rotary drying drum 11. The rotating shaft is fixedly connected to the dispersion plate 24, and the dispersion plate 24 is initially arranged perpendicular to the material-diverting plate 21.

[0041] See Figure 2 、 Figure 4 、 Figure 5 、 Figure 8 and Figure 9The two baffle plates 22 have a common fixed installation on their opposite sides with a uniform distribution plate 221, and the uniform distribution plate 221 is located on the side with the same rotation direction as the material diverter plate 21 and the rotary drying drum 11. The uniform distribution plate 221 is provided with a plurality of radially evenly arranged rectangular holes, and the side of the material diverter plate 21 facing the uniform distribution plate 221 is fixed with a plurality of radially evenly arranged flow equalizing plate groups 216, each flow equalizing plate group 216 includes a plurality of flow equalizing plates evenly arranged on the left and right.

[0042] The dispersion unit 2 is used to prevent thick or pasty raw materials from accumulating into large agglomerates; specifically, when the rotary drying drum 11 rotates, the rotary drying drum 11 drives the material stripping plate 21 to rotate, and when the material stripping plate 21 rotates to the lowest point, the uniform distribution plate 221 first contacts the thick or pasty raw material. As the uniform distribution plate 221 rotates, the thick or pasty raw material can pass through the rectangular hole and contact the material stripping plate 21, and under the action of the rectangular hole, the thick or pasty raw material can be preliminarily dispersed, so that the thick or pasty raw material is evenly distributed on the material stripping plate 21 while the material stripping plate 21 picks up the thick or pasty raw material. Under the action of the two baffle plates 22, the raw material is always located on the material stripping plate 21.

[0043] When the material stripping plate 21 rotates to a state where one end near the middle of the rotary drying drum 11 is tilted downward, the thick or pasty raw material moves along the surface of the material stripping plate 21 toward the dispersion plate 24 under the action of gravity, and moves out of the material stripping plate 21 from the dispersion holes of the dispersion plate 24. Under the action of the dispersion holes of the dispersion plate 24, the thick or pasty raw material will not accumulate into large agglomerates and fall into the rotary drying drum 11, so that the thick or pasty raw material can fully and evenly contact with the hot air during the falling process, thereby ensuring the drying effect of the thick or pasty raw material and the quality of the product after drying. The dispersion holes of the dispersion plate 24 are set to a conical structure to prevent the thick or pasty raw material from being blocked in the dispersion holes of the dispersion plate 24.

[0044] When a large amount of thick or pasty raw materials accumulate on the dispersion plate 24, the thick or pasty raw materials push the dispersion plate 24 to rotate with the center line of the rotating shaft as the reference under the action of gravity, and the angle between the dispersion plate 24 and the material-dipping plate 21 changes from a right angle to an obtuse angle, so that the dispersion holes located above move to the corresponding positions of the thick or pasty raw materials as the material-dipping plate 21 rotates, and the thick or pasty raw materials can be moved out of the dispersion holes of more dispersion plates 24, and then before the material-dipping plate 21 rotates to the highest point, the thick or pasty raw materials can all be moved out of the material-dipping plate 21 from the dispersion holes of the dispersion plate 24. When the thick or pasty raw materials are completely moved out of the material-dipping plate 21, the rotating shaft drives the dispersion plate 24 to reset under the action of the torsion spring.

[0045] At the same time, the spreading group 25 can periodically and quickly spread the thick or pasty raw materials toward one end away from the middle of the rotary drying drum 11, so that the thick and pasty raw materials collide with the flow equalizing plate under the rapid spreading action of the spreading group 25. Then, when there is agglomeration in the thick or pasty raw materials, the agglomerated thick or pasty raw materials can be broken under the impact, further ensuring the drying effect of the thick or pasty raw materials, thereby further ensuring the quality of the dried products.

[0046] See Figure 4 、 Figure 5 and Figure 6 The scattering group 25 includes a sliding plate 251 radially slidably mounted on the material stripping plate 21, and the sliding plate 251 is located at one end of the material stripping plate 21 close to the middle of the rotary drying cylinder 11. The sliding plate 251 is connected to the material stripping plate 21 through a plurality of return springs 252 evenly arranged on the left and right. A sealing plate 253 is fixedly mounted on the sliding plate 251, and the sealing plate 253 is in contact with the rotary drying cylinder 11. A scattering plate 254 is fixedly mounted on the middle part of the sealing plate 253 away from the sliding plate 251. The sealing plate 253 is used to seal the sliding connection between the sliding plate 251 and the material stripping plate 21.

[0047] See Figure 2 and Figure 3 An arc-shaped plate 112 is fixedly installed on the upper front part of the right end of the feed plate 111, and a plurality of evenly arranged arc-shaped toggle blocks 113 are fixedly installed on the right side of the left arc-shaped plate 112 near the middle of the rotary drying drum 11.

[0048] See Figure 3 、 Figure 4 and Figure 6 The left end of the sliding plate 251 on the far left is fixedly installed with a toggle rod 255, and the left end of the toggle rod 255 on the left slides through the leftmost material stripping plate 21 and the material baffle plate 22 in sequence. The toggle block 113 on the left, close to the middle of the rotary drying drum 11, is set as an inclined surface that matches the corresponding toggle rod 255. A square synchronization rod 256 is fixedly installed between the two adjacent sliding plates 251 on the left and right, and the square synchronization rod 256 slides through the corresponding material stripping plate 21 and the material baffle plate 22.

[0049] It should be noted that a sealing block 1 is fixedly provided on the outside of the toggle rod 255 and the square synchronization rod 256, and the sealing block 1 is radially slidably connected to the corresponding baffle plate 22. The sealing block 1 is used to seal the sliding connection between the toggle rod 255 and the baffle plate 22 and the sliding connection between the square synchronization rod 256 and the baffle plate 22.

[0050] It should be noted that, see Figure 2 and Figure 12, an arc-shaped plate 112 is also distributed in the rotary drying drum 11 and on the right side of the rightmost stripping plate 21, and the distribution position of the right arc-shaped plate 112 corresponds to the installation position of the left arc-shaped plate 112. A round rod is fixedly installed in the feed port of the feed plate 111 through multiple circumferentially evenly arranged fixing rods, and a fixing plate is fixedly installed between the round rod and the right arc-shaped plate 112. A plurality of arc-shaped evenly arranged toggle blocks 113 are also fixedly installed on one end of the left side of the right arc-shaped plate 112 near the middle of the rotary drying drum 11. A toggle rod 255 is also fixedly installed on the right end of the sliding plate 251 located on the rightmost side. The right end of the toggle rod 255 located on the right slides through the rightmost stripping plate 21 and the baffle plate 22 in turn, and the end of the toggle block 113 on the right near the middle of the rotary drying drum 11 is also set to a slope that matches the corresponding toggle rod 255.

[0051] The dispersing group 25 is used to quickly spread thick or pasty raw materials toward the inner wall of the rotary drying drum 11; specifically, when the dispersing plate 21 rotates to a state where one end close to the middle of the rotary drying drum 11 is tilted downward and continues to rotate, the dispersing plates 21 on the left and right sides drive the toggle rod 255 to rotate to the corresponding position of the toggle block 113 through the sliding plate 251. When the toggle rod 255 and the toggle block 113 oblique surface contact and continue to rotate, the toggle rod 255 and the toggle block 113 oblique surface cooperate to drive the corresponding sliding plate 251 to move and compress the corresponding return spring 252. When the toggle rod 255 and the toggle block 113 are separated, the position The sliding plates 251 on the left and right sides quickly return to their initial positions under the action of the corresponding multiple return springs 252, thereby driving the sliding plates 251 to move back and forth radially, so that the sliding plates 251 drive the scattering plates 254 to quickly move the raw materials toward the inner wall of the rotary drying drum 11, and then the thick and pasty raw materials hit the flow equalizing plate under the rapid moving action of the scattering plates 254. Moreover, since multiple return springs 252 are connected between the sliding plates 251 and the material-dispensing plates 21, the scattering plates 254 can move the thick and pasty raw materials with a larger elastic force, thereby achieving the impact and crushing of the agglomerated thick or pasty raw materials.

[0052] There are multiple shifting blocks 113 , and under the action of the square synchronization rod 256 , all the scattering plates 254 can synchronously shift the raw materials toward the inner wall of the rotary drying drum 11 quickly.

[0053] See Figure 4 、 Figure 5 and Figure 6 The side of the material-diverting plate 21 away from the middle of the rotary drying drum 11 is set as a hollow structure, and a positioning plate 212 is radially slidably installed in the hollow structure of the material-diverting plate 21 through a plurality of top springs 211 evenly arranged on the left and right. The positioning plate 212 is provided with a plurality of positioning holes 213 evenly arranged front and back, and the material-diverting plate 21 is provided with a plurality of staggered holes arranged alternately with the positioning holes 213.

[0054] See Figure 2 、 Figure 3 and Figure 6 A matching plate 114 of an arc structure is fixedly installed at one end of the right side of the left curved plate 112 away from the middle of the rotary drying drum 11; a matching rod 214 is fixedly installed at the middle of the left end of the leftmost alignment plate 212, and the left end of the left matching rod 214 slides through the leftmost material stripping plate 21 and the material baffle plate 22 in turn, and the lower end of the matching plate 114 on the left is set as an inclined surface that matches the corresponding matching rod 214, and a synchronous plate 215 is fixedly installed between the two adjacent alignment plates 212 arranged on the left and right, and the synchronous plate 215 slides through its corresponding material stripping plate 21 and the material baffle plate 22.

[0055] It should be noted that a sealing block 2 is fixedly provided on the outside of the mating rod 214 and the synchronous plate 215, and the sealing block 2 is radially slidably connected to the corresponding baffle plate 22. The sealing block 2 is used to seal the sliding connection between the mating rod 214 and the baffle plate 22 and the sliding connection between the synchronous plate 215 and the baffle plate 22.

[0056] It should be noted that, see Figure 2 and Figure 12 A matching plate 114 with an arc structure is also fixedly installed on the left side of the right side arc plate 112, away from the middle of the rotary drying drum 11; a matching rod 214 is also fixedly installed on the middle of the right end of the rightmost alignment plate 212, and the right end of the right side matching rod 214 slides through the rightmost material stripping plate 21 and the material blocking plate 22 in sequence, and the lower end of the matching plate 114 on the right is set to an inclined surface that matches the corresponding matching rod 214.

[0057] When the stripping plate 21 rotates to a state where one end of the stripping plate 21 is tilted downward near the middle of the rotary drying drum 11 and continues to rotate, the stripping plates 21 on the left and right sides drive the corresponding matching rods 214 to rotate to the corresponding positions of the matching plate 114 oblique surfaces and continue to rotate, so that the matching rods 214 move toward the middle of the rotary drying drum 11 under the action of the oblique surfaces of the matching plates 114, and then the matching rods 214 move along the inner curved surface of the matching plate 114, so that the matching rods 214 drive the stripping plate 212 to move toward the middle of the rotary drying drum 11 and stretch the corresponding multiple extension springs 211. At this time, the alignment holes 213 of the alignment plate 212 and the dislocation holes of the stripping plate 21 are connected to form a blanking channel.

[0058] When the end of the stripping plate 21 near the middle of the rotary drying drum 11 is tilted downward, the thick and paste raw materials move downward along the surface of the stripping plate 21 and accumulate on the dispersion plate 24, so that a small amount of thick and paste raw materials are located at a position corresponding to the alignment plate 212. At this time, only a small amount of thick and paste raw materials move out of the stripping plate 21 from the blanking channel, and at this time, the thick and paste raw materials will not move out of the blanking channel in the form of accumulating into large lumps. At the same time, when the dispersion plate 254 is maintained When the corresponding raw materials are continuously and quickly moved toward the equalizing plate group 216, the thick and pasty raw materials can be moved to the corresponding position of the alignment plate 212, and the auxiliary raw materials are moved out of the alignment plate 212 from the blanking channel. Under the action of multiple equalizing plates, the moved thick and pasty raw materials can be separated to the left and right, further ensuring that the thick and pasty raw materials will not be moved out of the blanking channel in the form of large lumps, and at the same time ensuring that the thick and pasty raw materials can be quickly moved out from the shifting plate 21.

[0059] At the same time, under the action of the synchronization plate 215, the multiple alignment plates 212 arranged on the left and right can move synchronously toward the middle of the rotary drying drum 11, and when the matching rod 214 and the matching plate 114 are separated, the alignment plate 212 returns to its initial position under the action of the extension spring 211, so that the alignment hole 213 of the alignment plate 212 and the offset hole of the material-selecting plate 21 are arranged alternately again.

[0060] See Figure 1 、 Figure 2 and Figure 7 The screening and drying unit 3 includes a plurality of lifting plates 31 fixedly installed in the rotary drying drum 11. A comb-shaped material dividing plate 32 is fixedly installed on one end of the lifting plate 31, which is on the same side as the rotary drying drum 11 and close to the middle of the rotary drying drum 11. A screening group 33 for screening and drying granular raw materials is installed on the lifting plate 31; the lifting plates 31 and their corresponding lifting plates 12 are evenly arranged circumferentially.

[0061] See Figure 2 、 Figure 7 、 Figure 10 and Figure 11 Two baffles 311 arranged symmetrically on the left and right are fixedly installed between the lifting plate 31, the dividing plate 32 and the rotary drying drum 11. A plurality of triangular plates 321 are fixedly installed on the side of the dividing plate 32 away from the middle of the rotary drying drum 11, and the comb teeth structures of the triangular plates 321 and the dividing plate 32 correspond one to one.

[0062] The screening and drying unit 3 is used to screen and dry the granular raw materials; specifically, when the rotary drying drum 11 rotates, the rotary drying drum 11 drives the lifting plate 31 to rotate. When the lifting plate 31 rotates to the lowest point, the lifting plate 31 lifts the granular raw materials, and under the action of the two baffles 311, the granular raw materials are always located on the lifting plate 31. When the lifting plate 31 rotates to a state where one end close to the middle of the rotary drying drum 11 is tilted downward, the granular raw materials move along the surface of the lifting plate 31 toward the direction close to the dividing plate 32 under the action of gravity. Under the action of the triangular plate 321, the granular raw materials pass through the comb holes of the dividing plate 32 and move into the screening group 33. The screening group 33 can screen and dry granular raw materials of different particle sizes, thereby preventing the granular raw materials from piling up, allowing the granular raw materials to fully contact with the hot air, and ensuring that the granular raw materials are thoroughly dried.

[0063] See Figure 2 、 Figure 7 、 Figure 10 and Figure 11 The screening group 33 includes a screening plate 331 fixedly mounted on the lifting plate 31 on one side close to the middle of the rotary drying drum 11. A plurality of guide grooves evenly arranged on the left and right sides are provided on the side of the screening plate 331 that has the same rotation direction as the rotary drying drum 11, and the positions of the guide grooves correspond one to one to the comb holes of the dividing plate 32. A plurality of screening holes 332 evenly arranged along the length direction of the guide grooves are provided in the guide grooves, and the closer to the middle of the rotary drying drum 11, the larger the aperture of the screening holes 332.

[0064] Preferably, the angle between the screening plate 331 and the lifting plate 31 is an obtuse angle (not shown in the figure).

[0065] The screening group 33 is used to screen and dry the granular raw materials; specifically, when the granular raw materials move out of the lifting plate 31 through the comb holes of the dividing plate 32, the granular raw materials can move into the guide groove of the sieve plate 331 corresponding to the comb holes, and move along the guide groove toward the middle of the rotary drying drum 11, so that the granular raw materials can pass through the sieve holes 332 and move out of the sieve plate 331 and fall into the rotary drying drum 11 under the action of gravity. At the same time, since the sieve holes 332 closer to the middle of the rotary drying drum 11 have larger apertures, when the granular raw materials move along the guide groove toward the middle of the rotary drying drum 11, the granular raw materials with small particle sizes can move out of the sieve holes 332 first. Out of the screening plate 331, since the diameter of the rotary drying cylinder 11 is large, when the rotary drying cylinder 11 rotates, the rotary drying cylinder 11 drives the lifting plate 31 to rotate at a smaller linear speed. When all the granular raw materials on the lifting plate 31 are removed from the lifting plate 31, the downward inclination angle of the end of the lifting plate 31 close to the middle of the rotary drying cylinder 11 is always at a smaller inclination angle, so that the speed of the granular raw materials moving along the guide groove toward the middle of the rotary drying cylinder 11 is relatively small, ensuring that the granular raw materials can be moved out of the screening plate 331 from the screening hole 332, thereby realizing the screening and drying of the granular raw materials, making the granular raw materials fully contact with the hot air, and ensuring that the granular raw materials are thoroughly dried.

[0066] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A drying device for extracting lithium by sulfuric acid method, comprising a rotary dryer, the rotary dryer comprising a continuously rotating rotary drying drum, wherein a plurality of shovels are fixedly installed in the rotary drying drum, characterized in that: A dispersion unit is installed on the left side of the rotary drying drum, and a screening and drying unit is installed on the right side of the rotary drying drum; The dispersion unit includes a plurality of material-dividing plates fixedly installed in the rotary drying drum, with baffle plates fixedly installed on both ends of the material-dividing plate, fixed between the baffle plate and the rotary drying drum, and a dispersion plate is installed on the opposite side of the two baffle plates and one end close to the middle of the rotary drying drum through a rotating member, and a plurality of dispersion holes of a conical structure are opened on the dispersion plate, and the baffle plate is used to cooperate with the material-dividing plate to dig up the raw materials, and the raw materials can only be moved out of the material-dividing plate from the dispersion holes of the dispersion plate, and a dispersion group for dispersing the raw materials is installed on the material-dividing plate; The screening and drying unit includes a plurality of lifting plates fixedly installed in the rotary drying drum, a comb-shaped material separation plate is fixedly installed on one end of the lifting plate, which rotates in the same direction as the rotary drying drum and is close to the middle of the rotary drying drum, and a screening group for screening and drying the granular raw materials is installed on the lifting plate; The stripping plates and lifting plates are evenly arranged around their corresponding copying plates; The rotating member includes a rotating shaft rotatably mounted on the two baffle plates, and a torsion spring is connected between the rotating shaft and the two baffle plates. The surface of the rotating shaft is in contact with a side of the material-diverting plate near the middle of the rotary drying drum. The rotating shaft is fixedly connected to the dispersion plate, and the dispersion plate is initially arranged perpendicular to the material-diverting plate. A feed plate is rotatably installed on the left side of the rotary drying drum, a feed port is provided on the feed plate, and the feed plate is fixedly connected to the fixed end of the rotary dryer, an arc plate is fixedly installed on the upper front part of the right end of the feed plate, and an arc plate is also distributed inside the rotary drying drum and to the right of the rightmost diverter plate. A plurality of diverter blocks evenly arranged in an arc shape are fixedly installed on one end of the opposite sides of the left and right arc plates close to the middle of the rotary drying drum, and a matching plate with an arc structure is fixedly installed on one end of the arc plate away from the middle of the rotary drying drum; The de-cluttering group includes a sliding plate radially slidably mounted on the de-cluttering plate, and the sliding plate is located at one end of the de-cluttering plate close to the middle of the rotary drying drum, the sliding plate is connected to the de-cluttering plate by a plurality of return springs evenly arranged on the left and right, a sealing plate is fixedly mounted on the sliding plate, and the sealing plate is in contact with the rotary drying drum, and a de-cluttering plate is fixedly mounted on the middle of one side of the sealing plate away from the sliding plate; A toggle rod is fixedly installed on the left end of the sliding plate on the far left and the right end of the sliding plate on the far right. The toggle rod slides radially through the corresponding material-digging plate and the material-blocking plate in turn. One end of the toggle block close to the middle of the rotary drying drum is set as an inclined surface that cooperates with the toggle rod. A square synchronization rod is fixedly installed between the two adjacent sliding plates on the left and right, and the square synchronization rod slides through its corresponding material-digging plate and the material-blocking plate. The side of the material-diverting plate away from the middle of the rotary drying drum is set as a hollow structure, and a positioning plate is radially slidably installed in the hollow structure of the material-diverting plate through a plurality of top extension springs evenly arranged left and right. The positioning plate is provided with a plurality of positioning holes evenly arranged front and back, and the material-diverting plate is provided with a plurality of staggered holes arranged in an alternating manner with the positioning holes; A matching rod is fixedly installed on the middle of the left end of the alignment plate located on the far left and the middle of the right end of the alignment plate located on the far right, and the matching rod slides through the corresponding material shifting plate and material blocking plate in turn. The lower end of the matching plate is set as an inclined surface that matches the matching rod. A synchronization plate is fixedly installed between the two adjacent alignment plates on the left and right, and the synchronization plate slides through the corresponding material shifting plate and material blocking plate.

2. A sulfuric acid method lithium extraction drying equipment according to claim 1, characterized in that, A uniform distribution plate is fixedly installed on the opposite sides of the two material baffles, and the uniform distribution plate is located on the side with the same rotation direction as the material diverter plate and the rotary drying drum. A plurality of radially evenly arranged rectangular holes are opened on the uniform distribution plate, and a plurality of radially evenly arranged flow equalizing plate groups are fixedly installed on the material diverter plate and the side facing the uniform distribution plate, and each flow equalizing plate group includes a plurality of flow equalizing plates evenly arranged on the left and right.

3. A sulfuric acid method lithium extraction drying equipment according to claim 1, characterized in that, Two baffles arranged symmetrically on the left and right are fixedly installed between the lifting plate, the material dividing plate and the rotary drying cylinder. Multiple triangular plates are fixedly installed on the side of the material dividing plate away from the middle of the rotary drying cylinder, and the comb teeth structures of the triangular plates and the material dividing plate correspond to each other one by one.

4. A sulfuric acid method lithium extraction drying equipment according to claim 1, characterized in that, The screening group includes a screening plate fixedly mounted on one side of the lifting plate close to the middle of the rotary drying drum. A plurality of guide grooves evenly arranged on the left and right sides are provided on the side of the screening plate with the same rotation direction as the rotary drying drum, and the positions of the guide grooves correspond one-to-one to the comb holes of the dividing plate. A plurality of screening holes evenly arranged along the length direction of the guide grooves are provided in the guide grooves, and the aperture of the screening holes becomes larger the closer to the middle of the rotary drying drum.

Images