Reaction device and method for multistage countercurrent ultrasonic enhanced scheelite leaching

Abstract

The invention belongs to the technical field of chemical reaction devices, and particularly relates to a reaction device and method for multistage countercurrent ultrasonic enhanced scheelite leaching. A reaction device for multistage countercurrent ultrasonic reinforcement scheelite leaching comprises a support, a first heating reaction cylinder, a second heating reaction cylinder and a discharging column with a discharging opening in the bottom end are installed on the support, ultrasonic oscillators are installed on the side wall of the first heating reaction cylinder and the side wall of the second heating reaction cylinder, and the top of the first heating reaction cylinder is communicated with a feeding cylinder. Crude tungstic acid and a coordination agent are added into a first heating reaction cylinder for heating reaction, a first square plate is vertical, a second square plate is horizontal, a baffle is closed, a solution flows back into the first heating reaction cylinder through a first communicating pipe, a backflow pipe and a water spraying ring, the solution flows into a second heating reaction cylinder through a discharging column for extraction, and the solution is filtered through a filter screen; the ultrasonic oscillator performs ultrasonic strengthening treatment, the reaction efficiency is improved, the filtering piece rotates, and impurities filtered out by the filtering net are discharged in time through a discharging opening of the discharging column.

Description

Technical Field

[0001] The present invention belongs to the technical field of chemical reaction devices, and particularly relates to a reaction device and method for multi-stage countercurrent ultrasonic enhanced leaching of scheelite. Background Art

[0002] Leaching refers to extracting soluble substances from solids using chemical solvents. The leaching agent can selectively chemically react with certain components in solid materials such as ores or concentrates, thereby preliminarily separating these components from the insoluble components.

[0003] After acid leaching of scheelite, ammonia-nitrogen wastewater is generated, and molybdenum in the ammonia-nitrogen wastewater needs to be removed through precipitation and filtration processes, resulting in relatively high production costs. The method of dissolving crude tungstic acid with a complexing agent can simplify the impurity removal work, but there are the following problems: (1) The reaction between crude tungstic acid and the complexing agent requires a long time to fully dissolve the tungsten component in the liquid. During the reaction process, the chance of intermolecular collision is limited, and the reaction is difficult to proceed quickly; (2) The solution is difficult to be fully mixed and circulated. The crude tungstic acid on the upper layer may not react completely, and some reactants cannot fully participate in the reaction, limiting the reaction efficiency; (3) The generated impurities remain inside the reaction vessel and are difficult to be discharged in time, and filtration is also required outside the reaction vessel. Summary of the Invention

[0004] In view of this, the present invention provides a reaction device and method for multi-stage countercurrent ultrasonic enhanced leaching of scheelite.

[0005] The technical implementation scheme of the present invention is: a reaction device for multi-stage countercurrent ultrasonic enhanced leaching of scheelite, including a bracket, on which a first heating reaction cylinder, a second heating reaction cylinder, and a discharge column with a discharge port at the bottom are installed. Ultrasonic oscillators are installed on the side walls of the first heating reaction cylinder and the second heating reaction cylinder. A feeding cylinder is connected to the top of the first heating reaction cylinder. A first connecting pipe is connected to the bottom end of the first heating reaction cylinder. A reflux pipe is connected between the first connecting pipe and the upper end of the first heating reaction cylinder. The first connecting pipe is connected to the upper end of the discharge column. A three-way pipe is connected between the upper end of the discharge column and the top of the second heating reaction cylinder. A filtering member is rotatably connected to the upper end of the discharge column.

[0006] Optionally, the reaction device for multi-stage countercurrent ultrasonic enhanced leaching of scheelite further includes a guide rod and a baffle. A sliding baffle is provided at the lower part of the feeding cylinder. A guide rod is connected to the first heating reaction cylinder. The baffle is slidably connected to the guide rod. The lower end of the feeding cylinder has a square cavity for the baffle to extend into. A round hole is opened at one end of the baffle located inside the feeding cylinder. When the baffle extends into the square cavity, the round hole is blocked and the baffle is closed.

[0007] Optionally, the reaction device for multi-stage countercurrent ultrasonic enhanced scheelite leaching further includes a suction pump, a water spray ring, and a guide ring. The suction pumps are installed at one end of the reflux pipe close to the first connecting pipe and on the first connecting pipe. The inner wall of the first heating reaction cylinder is connected with the water spray ring, the reflux pipe is communicated with the water spray ring, and the inner wall of the first heating reaction cylinder is connected with a guide ring located above the water spray ring.

[0008] Optionally, the filter element includes a rotating shaft, a first square plate, a filter screen, and a second square plate. The rotating shaft is rotatably connected to the upper end of the discharge column. The first square plate and the second square plate are both connected to the rotating shaft. The first square plate and the second square plate are perpendicular to each other, and the filter screen is installed on the first square plate.

[0009] Optionally, the reaction device for multi-stage countercurrent ultrasonic enhanced scheelite leaching further includes a driving mechanism for driving the rotating shaft to rotate. The driving mechanism includes a first electric push rod. The upper part of the discharge column is connected with the first electric push rod. The telescopic rod of the first electric push rod is connected with a lifting rod. Both ends of the rotating shaft are connected with coaxial rotating rods. Long holes are formed in the rotating rods, and two convex blocks located in the long holes are arranged at the upper end of the lifting rod.

[0010] Optionally, the reaction device for multi-stage countercurrent ultrasonic enhanced scheelite leaching further includes a first hinged rod and a second hinged rod. Both ends of the rotating shaft are connected with coaxial rotating first hinged rods, and the second hinged rods are rotatably connected between the two first hinged rods and the baffle.

[0011] Optionally, the reaction device for multi-stage countercurrent ultrasonic enhanced scheelite leaching further includes a separation cylinder. The separation cylinder is connected to the support. A second connecting pipe is communicated between the bottom end of the second heating reaction cylinder and the top of the separation cylinder. The bottom end of the separation cylinder is communicated with a discharge pipe. The suction pumps are also installed on the second connecting pipe and the discharge pipe. A sliding lifting pipe is arranged at the top of the separation cylinder. The support is connected with a second electric push rod, and the telescopic rod of the second electric push rod is connected with the lifting pipe.

[0012] A reaction method for multi-stage countercurrent ultrasonic enhanced scheelite leaching is as follows: S1. Add crude tungstic acid and a complexing agent into the first heating reaction cylinder. Control the first electric push rod to raise the lifting rod and the convex blocks. The convex blocks push the rotating rods to rotate. The rotating shaft, the first square plate, the second square plate, and the first hinged rod rotate 90 degrees, driving the second hinged rod to rotate. The second hinged rod pushes the baffle to slide and close. S2. Heat the crude tungstic acid and the complexing agent in the first heating reaction cylinder. Control the ultrasonic oscillator to perform ultrasonic treatment. The solution in the first heating reaction cylinder flows countercurrently to the water spray ring through the first connecting pipe and the reflux pipe, and the solution circulates. S3. The solution in the first heating reaction cylinder flows into the second heating reaction cylinder through the first connecting pipe, the discharge column, and the three-way pipe. The filter screen filters the solution. Add an extractant through the three-way pipe. Heat the second heating reaction cylinder and control the ultrasonic oscillator to perform ultrasonic treatment. S4. The solution in the second heating reaction cylinder enters the separation cylinder, the lifting pipe extracts the upper-layer solution, the electric push rod two is controlled to drive the lifting pipe to slide, the pumping depth is controlled, and the lower-layer material is discharged from the discharge pipe.

[0013] Compared with the prior art, the present invention has the following advantages: 1. The crude tungstic acid and the complexing agent are added into the first heating reaction cylinder for heating reaction. The first square plate is vertical, the second square plate is horizontal, the baffle is closed, and the solution flows back to the first heating reaction cylinder through the first connecting pipe, the reflux pipe and the water spraying ring in a countercurrent manner. The solution flows into the second heating reaction cylinder through the discharging column for extraction. The filter screen filters the solution, and the ultrasonic oscillator performs ultrasonic strengthening treatment to improve the reaction efficiency. The filtering member rotates, and the impurities filtered out by the filter screen are discharged in time through the discharging port of the discharging column.

[0014] 2. The electric push rod one is controlled to raise the lifting rod and the convex block. The filtering member rotates. Driven by the first hinge rod and the second hinge rod, the baffle slides to close, and the material in the first heating reaction cylinder can be heated and reacted. The electric push rod one is controlled to lower the lifting rod and the convex block. The filtering member rotates and resets, so that the impurities filtered out by the filter screen are discharged, and the baffle opens synchronously. The discharge of impurities and the opening and closing of the baffle are synchronized, and the working efficiency is high.

[0015] 3. The solution after the reaction in the second heating reaction cylinder enters the separation cylinder for separation. The soft pumping pipe is butted against the lifting pipe, so that the lifting pipe extracts the upper-layer solution containing molybdate. The electric push rod two is controlled to drive the lifting pipe to slide in the up-and-down direction to control the pumping depth and avoid extracting the lower-layer pure tungstic acid. The lower-layer pure tungstic acid is discharged from the discharge pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the overall structural schematic diagram of the present invention.

[0017] Figure 2 is the partial sectional front view of the present invention with the bracket hidden.

[0018] Figure 3 is the partial sectional structural schematic diagram of the first heating reaction cylinder, the ultrasonic oscillator, the feeding cylinder, the baffle, the first connecting pipe, the reflux pipe, the water spraying ring and the guiding ring of the present invention.

[0019] Figure 4 is the connection relationship schematic diagram of the filtering member, the driving mechanism, the first hinge rod and the second hinge rod of the present invention.

[0020] Figure 5 For the present invention Figure 3 in the partial structural schematic diagram.

[0021] Figure 6 is the structural schematic diagram of the water spraying ring and the guiding ring of the present invention.

[0022] Figure 7This is a schematic structural diagram of the filter element and the drive mechanism of the present invention.

[0023] Figure 8 This is a schematic structural diagram of the separation cylinder, the second electric push rod, the lifting pipe and the discharge pipe of the present invention.

[0024] The markings of each component in the attached drawings are as follows: 1 - support, 2 - the first heating reaction cylinder, 21 - ultrasonic oscillator, 22 - detector, 3 - feeding cylinder, 31 - square cavity, 32 - guide rod, 33 - baffle, 34 - round hole, 4 - the first connecting pipe, 5 - return pipe, 51 - extraction pump, 52 - water spray ring, 53 - guide ring, 6 - discharge column, 7 - the second heating reaction cylinder, 8 - three-way pipe, 9 - filter element, 91 - rotating shaft, 92 - the first square plate, 93 - filter screen, 94 - the second square plate, 101 - the first electric push rod, 102 - lifting rod, 103 - convex block, 104 - rotating rod, 111 - the first articulated rod, 112 - the second articulated rod, 121 - separation cylinder, 122 - the second connecting pipe, 123 - the second electric push rod, 124 - lifting pipe, 125 - discharge pipe. Detailed implementation manners

[0025] A reaction device and method for multi-stage countercurrent ultrasonic enhanced leaching of scheelite, referring to Figures 1-8 , includes a support 1, the first heating reaction cylinder 2, an ultrasonic oscillator 21, a detector 22, a feeding cylinder 3, the first connecting pipe 4, a return pipe 5, a discharge column 6, the second heating reaction cylinder 7, a three-way pipe 8 and a filter element 9. The support 1 is installed with the first heating reaction cylinder 2 and the second heating reaction cylinder 7 having heating functions. Temperature sensors are installed on both the first heating reaction cylinder 2 and the second heating reaction cylinder 7. Ultrasonic oscillators 21 and detectors 22 for detecting the pH value are installed on the side walls of both the first heating reaction cylinder 2 and the second heating reaction cylinder 7. The heating methods of the first heating reaction cylinder 2 and the second heating reaction cylinder 7 are prior arts. The structures and control methods of the temperature sensors, the ultrasonic oscillators 21 and the detectors 22 are prior arts. The top of the first heating reaction cylinder 2 is connected to the feeding cylinder 3, the bottom end of the first heating reaction cylinder 2 is connected to the first connecting pipe 4, and a return pipe 5 is connected between the left end of the first connecting pipe 4 and the upper side wall of the first heating reaction cylinder 2. The middle of the support 1 is connected with a discharge column 6 having a discharge port at the bottom end. The right end of the first connecting pipe 4 is connected to the upper left side of the discharge column 6. A three-way pipe 8 is connected between the upper right side of the discharge column 6 and the top of the second heating reaction cylinder 7. The upper end of the discharge column 6 is rotatably connected with a filter element 9; the filter element 9 includes a rotating shaft 91, the first square plate 92, a filter screen 93 and the second square plate 94. The rotating shaft 91 is rotatably connected to the upper right part of the discharge column 6. The first square plate 92 and the second square plate 94 are both fixedly connected to the rotating shaft 91. The first square plate 92 and the second square plate 94 are perpendicular to each other. The filter screen 93 is installed in the middle of the first square plate 92. The edges of the first square plate 92 and the second square plate 94 in contact with the inner wall of the discharge column 6 are made of rubber material to play a sealing role and prevent the solution from leaking out.

[0026] Reference Figures 1-5 Moreover, the reaction device for multi-stage countercurrent ultrasonic enhanced leaching of scheelite further includes a guide rod 32 and a baffle 33. A baffle 33 that can slide left and right is provided at the lower part of the feeding cylinder 3. The top of the first heating reaction cylinder 2 is fixedly connected with a guide rod 32, and the baffle 33 is slidably connected to the guide rod 32. The lower end of the feeding cylinder 3 has a square cavity 31 for the baffle 33 to extend into. One end of the baffle 33 located inside the feeding cylinder 3 is provided with a round hole 34. When the baffle 33 extends into the square cavity 31, the round hole 34 is blocked and the baffle 33 is closed.

[0027] Reference Figure 2 、 Figure 3 、 Figure 5 and Figure 6 In addition, the reaction device for multi-stage countercurrent ultrasonic enhanced leaching of scheelite further includes a extraction pump 51, a water spraying ring 52 and a guiding ring 53. Extraction pumps 51 are installed at one end of the reflux pipe 5 close to the first connecting pipe 4 and on the first connecting pipe 4. The upper side of the inner wall of the first heating reaction cylinder 2 is connected with a water spraying ring 52 which has nozzles. The top end of the reflux pipe 5 is communicated with the water spraying ring 52. The upper side of the inner wall of the first heating reaction cylinder 2 is connected with a guiding ring 53 located above the water spraying ring 52. The guiding ring 53 guides the materials added into the first heating reaction cylinder 2 to prevent the materials from remaining above the water spraying ring 52.

[0028] Reference Figure 2 、 Figure 4 and Figure 7 Furthermore, the reaction device for multi-stage countercurrent ultrasonic enhanced leaching of scheelite further includes a driving mechanism for driving the rotation of the rotating shaft 91. The driving mechanism includes a first electric push rod 101, a lifting rod 102, a convex block 103 and a rotating rod 104. The first electric push rod 101 is bolted to the upper left part of the discharging column 6. The lifting rod 102 is connected to the telescopic rod of the first electric push rod 101. Both the front and rear ends of the rotating shaft 91 are fixedly connected with coaxially rotating rotating rods 104. Long holes are formed in the rotating rods 104. The upper end of the lifting rod 102 is rotatably connected with two convex blocks 103 located in the long holes.

[0029] Reference Figure 1 、 Figure 2 and Figure 4 Moreover, the reaction device for multi-stage countercurrent ultrasonic enhanced leaching of scheelite further includes a first articulated rod 111 and a second articulated rod 112. Both the front and rear ends of the rotating shaft 91 are fixedly connected with coaxially rotating first articulated rods 111. A second articulated rod 112 is rotatably connected between the left ends of the two first articulated rods 111 and the baffle 33.

[0030] Reference Figure 1 、 Figure 2 and Figure 8, The reaction device for multi-stage countercurrent ultrasonic enhanced leaching of scheelite also includes a separation cylinder 121, a second connecting pipe 122, a second electric push rod 123, a lifting pipe 124 and a discharge pipe 125. The right part of the bracket 1 is connected with the separation cylinder 121. There is a second connecting pipe 122 communicating between the bottom end of the second heating reaction cylinder 7 and the top of the separation cylinder 121. The bottom end of the separation cylinder 121 is communicated with the discharge pipe 125. Extraction pumps 51 are also installed on both the second connecting pipe 122 and the discharge pipe 125. There is a vertically sliding lifting pipe 124 at the top of the separation cylinder 121. The second electric push rod 123 is bolted to the right part of the bracket 1, and the telescopic rod of the second electric push rod 123 is connected with the lifting pipe 124.

[0031] Initially, the baffle 33 is in the open state, the first square plate 92 is in the horizontal state, and the second square plate 94 is in the vertical state; first, the crude tungstic acid and the complexing agent obtained from the acid leaching of the ore are added into the feeding cylinder 3. The crude tungstic acid and the complexing agent in the feeding cylinder 3 enter the first heating reaction cylinder 2 through the round hole 34. Control the first electric push rod 101 to drive the lifting rod 102 to rise, driving the convex block 103 to rise. Since the convex block 103 is located in the long hole of the rotating rod 104, the rising convex block 103 will push the rotating rod 104 to rotate clockwise by 90 degrees around the rotating shaft 91. The rotating shaft 91, the first square plate 92, the second square plate 94 and the first hinged rod 111 rotate clockwise by 90 degrees together with the rotating rod 104. The first square plate 92 becomes vertical, and the second square plate 94 is in the horizontal state. The clockwise rotating first hinged rod 111 drives the second hinged rod 112 to rotate. Since the baffle 33 can only slide in the left-right direction, the rotating second hinged rod 112 will push the baffle 33 to slide to the left. The left end of the baffle 33 extends into the square cavity 31, blocking the round hole 34, and the baffle 33 closes.

[0032] Heat the crude tungstic acid and the complexing agent through the first heating reaction cylinder 2. The crude tungstic acid and the complexing agent react, so that the tungsten component dissolves in the liquid to form concentrated tungstic acid. Control the ultrasonic oscillator 21 to perform ultrasonic enhancement treatment to improve the reaction rate. The detector 22 detects the pH value of the solution in the first heating reaction cylinder 2. The extraction pump 51 on the first connecting pipe 4 is in the closed state. At the same time, control the extraction pump 51 on the reflux pipe 5 to work, so that the solution in the first heating reaction cylinder 2 flows countercurrently to the water spraying ring 52 through the first connecting pipe 4 and the reflux pipe 5. The refluxed solution is sprayed out of the water spraying ring 52 through the nozzles into the first heating reaction cylinder 2, making the solution circulate, avoiding incomplete reaction of the crude tungstic acid on the upper layer and improving the reaction efficiency.

[0033] After the reaction between crude tungstic acid and the complexing agent is completed, control the extraction pump 51 on the first connecting pipe 4 to operate, so that the solution in the first connecting pipe 4 flows into the upper end inside the discharging column 6. Blocked by the horizontal square plate 94, the solution is prevented from flowing out of the discharging port. The solution at the upper end inside the discharging column 6 passes through the filter screen 93 and the three-way pipe 8 and enters the second heating reaction cylinder 7. The filter screen 93 plays a filtering role, and a small amount of filtered impurities remain on the left side of the vertical square plate 92. Add the extractant into the second heating reaction cylinder 7 from the upper end of the three-way pipe 8. The second heating reaction cylinder 7 heats the solution inside it. The extracted molybdenum can be recovered in the form of molybdate, without generating molybdenum slag. The detector 22 detects the pH value of the solution and controls the ultrasonic oscillator 21 to perform ultrasonic strengthening treatment. Ultrasonic waves have the effect of assisting extraction. By the vibration energy of the ultrasonic waves, the contact between the extractant and the solution is increased, thereby improving the extraction efficiency.

[0034] Control the extraction pump 51 on the second connecting pipe 122 to operate. The solution after the reaction in the second heating reaction cylinder 7 enters the separation cylinder 121 for separation. Connect the external soft extraction pipe to the lifting pipe 124, control the extraction equipment, so that the lifting pipe 124 extracts the upper layer of solution containing molybdate. Control the second electric push rod 123 to drive the lifting pipe 124 to slide in the up and down direction, which can control the extraction depth and prevent the lower layer of pure tungstic acid from being extracted. Finally, control the extraction pump 51 on the discharging pipe 125 to discharge the lower layer of pure tungstic acid from the discharging pipe 125.

[0035] Control the first electric push rod 101 to lower the lifting rod 102 and the convex block 103 to reset. The descending convex block 103 pushes the rotating rod 104 to rotate counterclockwise by 90 degrees around the rotating shaft 91 to reset. The rotating shaft 91, the square plate 92, the square plate 94 and the first hinge rod 111 rotate counterclockwise by 90 degrees. The square plate 92 becomes horizontal, and the square plate 94 becomes vertical. The impurities filtered out by the filter screen 93 are discharged through the discharging port of the discharging column 6. The counterclockwise rotating first hinge rod 111 drives the second hinge rod 112 to reverse, and the second hinge rod 112 pulls the baffle 33 to slide to the right to reset, and the baffle 33 opens synchronously. The discharge of impurities and the opening and closing of the baffle 33 are synchronized, and then the chemical reaction treatment can be carried out on the next batch of crude tungstic acid. No ammonia-nitrogen wastewater and hazardous waste residues are generated during the whole treatment process, which is green and environmentally friendly.

[0036] A reaction method for multi-stage countercurrent ultrasonic enhanced leaching of scheelite, the specific steps are as follows: S1. Add crude tungstic acid and the complexing agent into the first heating reaction cylinder 2. Control the first electric push rod 101 to raise the lifting rod 102 and the convex block 103. The convex block 103 pushes the rotating rod 104 to rotate. The rotating shaft 91, the square plate 92, the square plate 94 and the first hinge rod 111 rotate by 90 degrees, driving the second hinge rod 112 to rotate. The second hinge rod 112 pushes the baffle 33 to slide and close. S2. Heat the first reaction cylinder 2 for the crude tungstic acid and the complexing agent, control the ultrasonic oscillator 21 to perform ultrasonic strengthening treatment, and the solution in the first reaction cylinder 2 flows countercurrently to the water spray ring 52 through the first connecting pipe 4 and the reflux pipe 5, and the solution circulates. S3. The solution in the first reaction cylinder 2 flows into the second reaction cylinder 7 through the first connecting pipe 4, the discharging column 6 and the three-way pipe 8. The filter screen 93 filters the solution, the extractant is added through the three-way pipe 8, the second reaction cylinder 7 is heated, and the ultrasonic oscillator 21 is controlled to perform ultrasonic treatment. S4. The solution in the second reaction cylinder 7 enters the separation cylinder 121, the upper layer solution is extracted by the lifting pipe 124, the electric push rod two 123 is controlled to drive the lifting pipe 124 to slide up and down to control the extraction depth, and the lower layer material is discharged from the discharging pipe 125.

Claims

1. A reaction device for multi-stage countercurrent ultrasonic enhanced leaching of scheelite, comprising a bracket (1), characterized in that, A heating reaction cylinder one (2), a heating reaction cylinder two (7) and a discharging column (6) with a discharging port at the bottom end are installed on the support (1). Ultrasonic oscillators (21) are installed on the side walls of both the heating reaction cylinder one (2) and the heating reaction cylinder two (7). A feeding cylinder (3) is connected to the top of the heating reaction cylinder one (2). A connecting pipe one (4) is connected to the bottom end of the heating reaction cylinder one (2). A reflux pipe (5) is connected between the connecting pipe one (4) and the upper end of the heating reaction cylinder one (2). The connecting pipe one (4) is connected to the upper end of the discharging column (6). A three-way pipe (8) is connected between the upper end of the discharging column (6) and the top of the heating reaction cylinder two (7). A filtering member (9) is rotatably connected to the upper end of the discharging column (6).

2. The reaction device for multi-stage countercurrent ultrasonic enhanced leaching of scheelite according to claim 1, characterized in that, The reaction device for multi-stage countercurrent ultrasonic enhanced leaching of scheelite further includes a guide rod (32) and a baffle (33). A sliding baffle (33) is provided at the lower part of the feeding cylinder (3). A guide rod (32) is connected to the heating reaction cylinder one (2). The baffle (33) is slidably connected to the guide rod (32). The lower end of the feeding cylinder (3) has a square cavity (31) for the baffle (33) to extend into. A round hole (34) is opened at one end of the baffle (33) located inside the feeding cylinder (3). When the baffle (33) extends into the square cavity (31), the round hole (34) is blocked and the baffle (33) is closed.

3. A reaction device for multi-stage countercurrent ultrasonic enhanced leaching of scheelite according to claim 2, characterized in that, The reaction device for multi-stage countercurrent ultrasonic enhanced leaching of scheelite further includes a pumping pump (51), a water spraying ring (52) and a guiding ring (53). The pumping pump (51) is installed at one end of the reflux pipe (5) close to the connecting pipe one (4) and on the connecting pipe one (4). The inner wall of the heating reaction cylinder one (2) is connected with a water spraying ring (52). The reflux pipe (5) is communicated with the water spraying ring (52). The inner wall of the heating reaction cylinder one (2) is connected with a guiding ring (53) located above the water spraying ring (52).

4. The reaction device for multi-stage countercurrent ultrasonic enhanced leaching of scheelite according to claim 3, characterized in that, The filtering member (9) includes a rotating shaft (91), a square plate one (92), a filter screen (93) and a square plate two (94). The rotating shaft (91) is rotatably connected to the upper end of the discharging column (6). The square plate one (92) and the square plate two (94) are both connected to the rotating shaft (91). The square plate one (92) and the square plate two (94) are perpendicular to each other. The filter screen (93) is installed on the square plate one (92).

5. The reaction device for multi-stage countercurrent ultrasonic enhanced leaching of scheelite according to claim 4, characterized in that, The reaction device for multi-stage countercurrent ultrasonic enhanced leaching of scheelite further includes a driving mechanism for driving the rotating shaft (91) to rotate. The driving mechanism includes an electric push rod one (101). The electric push rod one (101) is connected to the upper part of the discharging column (6). A lifting rod (102) is connected to the telescopic rod of the electric push rod one (101). Coaxial rotating rods (104) are connected to both ends of the rotating shaft (91). Long holes are opened on the rotating rods (104). Two convex blocks (103) located in the long holes are provided at the upper end of the lifting rod (102).

6. The reaction device for multi-stage countercurrent ultrasonic enhanced leaching of scheelite according to claim 5, characterized in that, The reaction device for multi-stage countercurrent ultrasonic enhanced leaching of scheelite also includes a first articulated rod (111) and a second articulated rod (112). Both ends of the rotating shaft (91) are connected with coaxially rotating first articulated rods (111), and a second articulated rod (112) is rotatably connected between each of the two first articulated rods (111) and the baffle (33).

7. The reaction device for multi-stage countercurrent ultrasonic enhanced leaching of scheelite according to claim 6, characterized in that, The reaction device for multi-stage countercurrent ultrasonic enhanced leaching of scheelite also includes a separation cylinder (121). The separation cylinder (121) is connected to the bracket (1). A second connecting pipe (122) is communicated between the bottom end of the second heating reaction cylinder (7) and the top of the separation cylinder (121). The bottom end of the separation cylinder (121) is communicated with a discharge pipe (125). Extraction pumps (51) are also installed on both the second connecting pipe (122) and the discharge pipe (125). A sliding lifting pipe (124) is arranged at the top of the separation cylinder (121). An electric push rod two (123) is connected to the bracket (1), and the telescopic rod of the electric push rod two (123) is connected to the lifting pipe (124).

8. A reaction method for ultrasonic enhanced leaching of scheelite by multi-stage countercurrent, characterized in that, When using the reaction device for multi-stage countercurrent ultrasonic enhanced leaching of scheelite as claimed in claim 7, the specific steps are as follows: S1. Add crude tungstic acid and complexing agent into the first heating reaction cylinder (2). Control the electric push rod one (101) to raise the lifting rod (102) and the convex block (103). The convex block (103) pushes the rotating rod (104) to rotate. The rotating shaft (91), the first square plate (92), the second square plate (94) and the first articulated rod (111) rotate 90 degrees, driving the second articulated rod (112) to rotate. The second articulated rod (112) pushes the baffle (33) to slide and close. S2. Heat the crude tungstic acid and complexing agent in the first heating reaction cylinder (2). Control the ultrasonic oscillator (21) to perform ultrasonic treatment. The solution in the first heating reaction cylinder (2) flows countercurrently to the water spraying ring (52) through the first connecting pipe (4) and the reflux pipe (5), and the solution circulates. S3. The solution in the first heating reaction cylinder (2) flows into the second heating reaction cylinder (7) through the first connecting pipe (4), the discharge column (6) and the three-way pipe (8). The filter screen (93) filters the solution. Add the extractant through the three-way pipe (8). Heat the second heating reaction cylinder (7) and control the ultrasonic oscillator (21) to perform ultrasonic treatment. S4. The solution in the second heating reaction cylinder (7) enters the separation cylinder (121). The lifting pipe (124) extracts the upper layer solution. Control the electric push rod two (123) to drive the lifting pipe (124) to slide and control the pumping depth. The lower layer material is discharged from the discharge pipe (125).

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