Device for extracting rare and precious metals from waste residues

Abstract

The application relates to the technical field of alkali residue treatment equipment, and particularly discloses a device for extracting rare and precious metals from waste residues, which comprises feeding mechanisms, converters and vacuum furnaces connected in sequence along production steps; a flue gas outlet of the converter is connected with a flue pipe; a water-cooled flue, a dust removal mechanism and a heat exchanger are arranged in the flue pipe in sequence; and a desulfurization device is connected with the tail end of the flue pipe; lead residues of the converter are transferred to a side-blown reduction furnace of a refining residue process through a transfer trolley; a liquid inlet of the vacuum furnace is connected with a liquid outlet of the converter; the vacuum furnace comprises a primary vacuum furnace and a secondary vacuum furnace; and lead-tin alloys produced by the secondary vacuum furnace are returned to the primary vacuum furnace. The patent aims to solve the problems that the existing device has low tin purity prepared from alkali residues and the alkali residues need to be pretreated before smelting.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of alkali residue treatment equipment, and particularly relates to a device for extracting rare and precious metals from waste residue. BACKGROUND

[0002] In the production refining process of crude lead, the alkali refining method is used to remove impurity elements such as tin and antimony in the lead liquid, so that a large amount of alkali residue, also known as refining residue, is generated, and the alkali residue contains a certain amount of tin and other rare and precious metals. If the tin in the alkali residue can be extracted to produce metal tin, the production and operation cost can be reduced, and the economic benefit of the enterprise can be further improved. The traditional method mainly uses a reverberatory furnace for reduction smelting, and under high temperature conditions (1100-1400 DEG C), a reducing agent is added, and in the smelting process, the oxides of tin and some impurities (such as lead, antimony, arsenic, etc.) are reduced to crude tin under the action of the reducing agent; however, the process has the problems of low tin reduction rate and low tin recovery rate due to difficult metal separation.

[0003] In view of the above problems, the existing alkali residue extraction device is improved, mainly by neutralizing and leaching the alkali residue by a wet method to dissolve the tin in the form of sodium stannate into the solution, and then forming a solid tin residue filter cake by pressure filtration; the tin content in the tin residue is increased, and then auxiliary materials are added and mixed, and then heated and smelted in a medium frequency furnace, and after the slag is discharged, the molten liquid is put into a slag ladle, and after solidification and cooling, the upper layer dross is removed to obtain crude tin. However, although this method improves the recovery rate of tin, the purity of the prepared metal tin is low, generally about 70%, and contains a large amount of impurities, and the alkali residue needs to be pretreated before smelting. SUMMARY

[0004] In view of the deficiencies of the prior art, the technical problem solved by the present application is to provide a device for extracting rare and precious metals from waste residue, which solves the problems of low purity of metal tin prepared from the existing device and the need for pretreatment of the alkali residue before smelting.

[0005] In order to solve the above problems, the technical scheme adopted by the present application is: a device for extracting rare and precious metals from waste residue, comprising a feeding mechanism, a converter and a vacuum furnace connected in sequence along the production steps, a smoke pipe connected to the smoke gas outlet of the converter, a water-cooled flue, a dust removal mechanism and a heat exchanger arranged in sequence in the smoke pipe, and a desulfurization device connected to the end of the smoke pipe; the lead residue outlet of the converter is transferred to the side-blown reduction furnace of the refining residue process by a transfer trolley, the liquid inlet of the vacuum furnace is connected to the liquid outlet of the converter, the vacuum furnace comprises a primary vacuum furnace and a secondary vacuum furnace connected in sequence, the lead-containing crude tin produced by the primary vacuum furnace is fed into the secondary vacuum furnace, the secondary vacuum furnace produces refined tin and lead-tin alloy, and the produced lead-tin alloy is returned to the primary vacuum furnace.

[0006] The beneficial effects of the scheme are: the lead-tin alloy and lead slag are obtained by smelting the alkali slag in the converter, the lead slag is returned to the side-blown reduction furnace in the lead refining process again to be used as raw material for refining lead, the raw material utilization rate is improved, and the effective substances of the raw material are fully extracted. The lead-tin alloy is sent to the vacuum furnace for refining. Under high-temperature vacuum conditions, the two metals are evaporated and condensed by using the different characteristics of the vapor pressures of tin and lead, so that separation is realized; the purity of the refined tin can reach 99.9%.

[0007] Further, the secondary vacuum furnace is provided with two, and the two secondary vacuum furnaces are connected in sequence. The purity of the metal tin is improved by multi-stage refining.

[0008] Further, the feeding mechanism includes a feeding conveyor belt and a preheating chamber, the preheating chamber is arranged above the feeding port of the converter, the preheating chamber is provided with preheating pipes arranged in a winding manner on the side wall, the heat exchanger is a tubular heat exchanger, the water medium pipeline of the heat exchanger is connected with the cooling water pipe of the water-cooled flue, and the cooling water pipe is connected with the preheating pipe; a partition plate is arranged between the heat exchanger and the water-cooled flue, the partition plate is provided with a one-way valve for allowing flue gas to flow from the water-cooled flue to the heat exchanger, the other side of the heat exchanger is provided with a sliding plate parallel to the partition plate, the sliding plate can reciprocally slide along the length direction of the smoke pipe, and the sliding plate and the smoke pipe jointly form a primary heat exchange chamber; the smoke pipes on both sides of the starting point of the sliding plate are provided with limiting mechanisms, the limiting mechanisms are released when the air pressure in the primary heat exchange chamber reaches a set value; the end point of the sliding plate is provided with a push rod, the push rod can push the sliding plate back to the starting point and be limited by the limiting mechanism again; the smoke pipe near the end point is provided with an exhaust port;

[0009] The dust removal mechanism is arranged in the primary heat exchange chamber, and the dust removal mechanism includes a filter screen arranged parallel to the partition plate and a dust removal brush moving up and down in the vertical direction, the dust removal brush is arranged in the horizontal direction and in contact with the heat exchange pipe, rotating rods and guide rods are arranged at both ends of the dust removal brush, a volute spring is connected to the upper end of the rotating rod, threads are arranged on the rotating rod, the dust removal brush is threadedly connected with the rotating rod and slidably connected with the guide rod; a pull rope is wound on the rotating rod, and one end of the pull rope is detachably fixed with the sliding plate; the rotating direction of the rotating rod pulled by the pull rope is opposite to the rotating direction of the rotating rod driven by the volute spring.

[0010] The low-temperature water is heated to medium-temperature water by the heat exchanger, and the heat exchanger is relatively sealed, so that the slide plate is released from the limit when the flue gas accumulates to a sufficient pressure in the heat exchange chamber, so that the flue gas can flow out of the smoke outlet. Since the low-temperature water continuously flows into the heat exchanger, the low-temperature water in the heat exchanger can be fully heated to reduce the temperature of the flue gas, so that the flue gas can be treated in the desulfurization device. The heat exchanger does not need to be too long to ensure that the flue gas and the heat exchanger are fully heated to reduce the temperature. The medium-temperature water is heated to high-temperature water in the cooling water pipe of the water-cooled flue, and then the high-temperature water is heated to the alkali slag raw material in the preheating pipe, so that the heat required by the converter to heat the alkali slag can be reduced. The medium-temperature water in the water-cooled flue exchanges heat with the high-temperature flue gas discharged from the converter, which can reduce the temperature of the high-temperature flue gas.

[0011] The dust removal brush moves up and down reciprocatingly by the movement of the slide plate and the volute spring, so that the dust on the surface of the heat exchanger is removed.

[0012] Further, the filter screen is slidably connected with the smoke pipe, and the pressure spring is arranged between the smoke pipe and the partition plate. The upper end of the filter screen is provided with a first wedge-shaped block, and the end of the dust removal brush close to the filter screen is provided with a second wedge-shaped block matched with the first wedge-shaped block. The first wedge-shaped block and the second wedge-shaped block matched with the first wedge-shaped block are both trapezoidal.

[0013] When the dust removal brush moves downward, the filter screen is pressed to the partition plate side through the inclined surface matched by the first wedge-shaped block and the second wedge-shaped block. After passing the second wedge-shaped block, the filter screen reciprocates under the elastic force of the pressure spring, so that the dust attached to the filter screen is shaken off into the dust collection box for collection.

[0014] Further, the limiting mechanism is an arc-shaped convex strip, and the smoke pipe at the sliding end point is provided with a switch. The switch is electrically connected with the push rod. When the slide plate slides to the sliding end point, the switch is pressed down. After the switch is pressed down for 3-10 seconds, the push rod is extended once to push the slide plate back. When the air pressure in the heat exchange chamber is large enough, the slide rod is pushed to pass the limiting convex strip under the air pressure. After passing the convex strip, the slide plate is no longer limited, so that it is quickly pushed to the sliding end point under the air pressure, so that the smoke outlet is communicated with the heat exchange chamber. The low-temperature flue gas after heat exchange is quickly discharged from the smoke outlet to the desulfurization device. The harmless flue gas after desulfurization treatment in the desulfurization device is discharged to the external environment. Without setting too many control mechanisms, the control structure is simple.

[0015] Further, the limiting mechanism is an electromagnetic strip, and the slide plate is provided with an iron sheet on both sides. The heat exchange chamber is provided with an air pressure sensor and a controller. The controller is electrically connected with the air pressure sensor and the electromagnetic strip. The controller is used to control the on-off of the electromagnetic strip according to the detection value of the air pressure sensor.

[0016] When the air pressure sensor detects that the temperature in the heat exchange chamber reaches the set upper limit value, the controller controls the electromagnetic strip to be powered off, so that the sliding plate slides to the sliding end point under the action of air pressure, so that the smoke outlet is communicated with the heat exchange chamber, and the flue gas in the heat exchange chamber is quickly discharged from the smoke outlet, so that the air pressure in the heat exchange chamber is reduced, and when the air pressure is reduced to the set lower limit value, the controller controls the electromagnetic strip to be powered on, and controls the push rod to be extended and retracted once to push the sliding plate back to the original position and be limited by the electromagnetic strip. The upper and lower limit values of the air pressure can be flexibly set by the controller, so that the flexible control of the flue gas residence time can be realized, and the control is more accurate. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a schematic diagram of the whole device of the application.

[0018] Figure 2 It is a schematic diagram of the inside of the smoke pipe of Example 1.

[0019] Figure 3 It is a schematic diagram of the inside of the smoke pipe of Example 2. DETAILED DESCRIPTION

[0020] The following will be further described in detail through specific embodiments:

[0021] The reference signs in the drawings of the specification include: a feeding conveyor belt 1, a preheating chamber 11, a preheating pipe 12, a converter 2, a vacuum furnace 3, a smoke pipe 4, a water-cooled flue 41, a heat exchanger 42, a partition plate 43, a one-way valve 431, a filter screen 44, a second wedge-shaped block 441, a dust removal brush 45, a rotating rod 451, a guide rod 452, a volute spring 453, a pull rope 454, a first wedge-shaped block 456, a sliding plate 46, a limiting convex strip 461, a push rod 47, a switch 48, an electromagnetic strip 49, a sensor 491, a cooling tower 5, a desulfurization device 6, a dust collection box 7, and an inclined chute 71.

[0022] Example 1 is basically as shown in the accompanying drawings: Figure 1 , and the accompanying drawings: Figure 2 A device for extracting rare and precious metals from waste residues, comprising a feeding mechanism, a converter 2, and a vacuum furnace 3 connected in sequence along the production steps, a smoke pipe 4 connected to the flue gas outlet of the converter 2, a water-cooled flue 41, a dust removal mechanism, and a heat exchanger 42 arranged in the smoke pipe 4 in sequence, and a desulfurization device 6 connected to the end of the smoke pipe 4; the lead slag outlet of the converter 2 is transferred to a side-blown reduction furnace in a refining slag process by a transfer trolley, the liquid inlet of the vacuum furnace 3 is connected to the liquid outlet of the converter 2, the vacuum furnace 3 includes a primary vacuum furnace 3 and a secondary vacuum furnace 3, the lead-tin alloy produced by the secondary vacuum furnace 3 is returned to the primary vacuum furnace 3, and the secondary vacuum furnace 3 of the embodiment is provided with two, and the two secondary vacuum furnaces 3 are connected in sequence.

[0023] The lead-tin alloy obtained by smelting the alkali residue in the converter 2 is sent into the vacuum furnace 3 for refining. The two metals are evaporated and condensed separately under the condition of high temperature and vacuum, so as to realize separation. The lead-tin alloy separated in the secondary vacuum furnace is returned to the primary vacuum furnace to continue to be used as the raw material for refining tin, so as to improve the yield of refined tin and reduce the waste of raw materials.

[0024] The feeding mechanism comprises a feeding conveyor 1 and a preheating chamber 11 arranged above the feeding port of the converter 2. The preheating chamber 11 is provided with preheating pipes 12 wound on the side wall. The heat exchanger 42 is a tubular heat exchanger 42. The water medium pipeline of the heat exchanger 42 is connected with the cooling water pipe of the water-cooled flue 41. The cooling water pipe is connected with the preheating pipes 12. The water outlet holes of the preheating pipes 12 are connected with the cooling tower 5 or other heat using units. When connected with the heat using units, the preheating pipes 12 can be used to produce hot water for production or hot water for daily use. The heat exchanger 42 and the water-cooled flue 41 are provided with a partition plate 43. The partition plate 43 is provided with a one-way valve 431 for allowing the flue gas to flow from the water-cooled flue 41 to the heat exchanger 42. The other side of the heat exchanger 42 is provided with a sliding plate 46 parallel to the partition plate 43. The sliding plate 46 can slide back and forth along the length direction of the flue pipe 4. The sliding plate 46 and the flue pipe 4 together form a primary heat exchange chamber. The flue pipe 4 on both sides of the starting point of the sliding plate 46 is provided with a limiting mechanism. The limiting mechanism is released when the air pressure in the primary heat exchange chamber reaches a set value. The sliding end of the sliding plate 46 is provided with a push rod 47. The push rod 47 can push the sliding plate 46 back to the starting point and be limited by the limiting mechanism again. The flue pipe 4 near the sliding end is provided with an exhaust port.

[0025] The low-temperature water entering the heat exchanger 42 is heated to medium-temperature water. The heat exchange chamber is relatively sealed. The sliding plate 46 is released when the flue gas accumulates to a sufficient pressure in the heat exchange chamber, so that the flue gas can flow out of the exhaust port. Since the flue gas has a process of accumulation in the heat exchange chamber and the low-temperature water continuously flows into the heat exchanger 42, the flue gas can be fully exchanged with the low-temperature water in the heat exchange pipes to reduce the temperature of the flue gas, which is convenient for subsequent desulfurization treatment in the desulfurization device 6 and does not need to set too many or too long heat exchangers 42 to ensure that the flue gas is fully exchanged with the heat exchanger 42 to reduce the temperature. The medium-temperature water after the first heating is heated to high-temperature water in the cooling water pipe of the water-cooled flue 41 for the second time, and finally enters the preheating pipes 12 to preheat the alkali residue raw material in the preheating chamber 11, so as to reduce the heat required by the converter 2 for heating the alkali residue. The medium-temperature water entering the water-cooled flue 41 is exchanged with the high-temperature flue gas just discharged from the converter 2 to play a role in initial cooling of the high-temperature flue gas.

[0026] The limiting mechanism is an arc-shaped convex strip, and a switch 48 is arranged in the smoke pipe 4 at the sliding end point, the switch 48 is electrically connected with the push rod 47, the sliding plate 46 slides to the sliding end point to press the switch 48, and after the switch 48 is pressed, the push rod 47 is retracted once to push the sliding plate 46 back to the original position after a delay of 3-10 seconds. When the air pressure in the heat exchange chamber is large enough, the sliding rod is pushed to cross the limiting convex strip 461 under the action of the air pressure, and after crossing the convex strip, the sliding plate 46 is no longer limited and is quickly pushed to the sliding end point under the action of the air pressure, so that the smoke outlet is communicated with the heat exchange chamber, and the low-temperature flue gas after heat exchange is quickly discharged from the smoke outlet to the desulfurization device 6, and the harmless flue gas after desulfurization treatment in the desulfurization device 6 is discharged to the external environment.

[0027] The dust removal mechanism is arranged in the first-stage heat exchange chamber, and the dust removal mechanism comprises a filter screen 44 arranged in parallel with the partition plate 43 and a dust removal brush 45 moving up and down in the vertical direction, the dust removal brush 45 is arranged in the horizontal direction and in contact with the heat exchange pipe, and the dust removal brush 45 is symmetrically provided with two along the length center axis of the heat exchanger 42; the dust removal brush 45 is respectively provided with a rotating rod 451 and a guide rod 452 at both ends, and the rotating rod 451 and the guide rod 452 are arranged in the vertical direction, the upper end of the rotating rod 451 is connected with a volute spring 453, and the rotating rod 451 is provided with threads, the dust removal brush 45 is threadedly connected with the rotating rod 451 and slidably connected with the guide rod 452; the rotating rod 451 is wound with a pull rope 454, one end of the pull rope 454 is detachably fixed with the sliding plate 46 through a bolt, and the rotating direction of the pull rope 454 pulling the rotating rod 451 is opposite to the rotating direction of the rotating rod 451 driven by the volute spring 453. The lower end of the filter screen 44 is provided with a dust collection box 7 for collecting smoke dust; the heat exchange pipe is fixed with the smoke pipe 4 through a bolt, and the smoke pipe 4 at the lower end of the heat exchange pipe is provided with an inclined chute 71, the end of the inclined chute 71 is connected with the dust collection box, so that the smoke dust falling on the heat exchange pipe falls into the inclined chute 71 and is collected in the dust collection box 7 after passing through the inclined chute 71.

[0028] When the sliding plate 46 moves to the sliding end point, the pull rope 454 is pulled, the pull rope 454 is wound on the rotating rod 451, and after the pull rope 454 is pulled, the rotating rod 451 is driven to rotate clockwise, the dust removal brush 45 is threadedly connected with the rotating rod 451 and is limited by the guide rod 452, so that the dust removal brush 45 moves downward to brush off the smoke dust on the surface of the heat exchanger 42. When the sliding plate 46 moves to the sliding end point, the switch 48 is pressed, after a delay of 8 seconds, the push rod 47 is retracted once to push the sliding plate 46 to cross the limiting strip, and then the push rod 47 is returned to the original position. When the sliding plate 46 returns to the original position, the pull rope 454 is no longer limited to the rotating rod 451, so that the rotating rod 451 is driven to rotate counterclockwise by the volute spring 453, and the pull rope 454 is wound on the rotating rod 451 again; at the same time, the rotating rod 451 drives the dust removal brush 45 to move upward to return to the original position.

[0029] Most of the smoke dust is filtered by the filter screen 44, and a small amount of small particle smoke dust enters the heat exchange chamber, and the moving dust removal brush 45 brushes off the smoke dust attached to the surface of the heat exchange pipe, thereby ensuring the heat exchange efficiency.

[0030] The filter screen 44 is slidably connected with the smoke pipe 4, and a compression spring is arranged between the smoke pipe 4 and the partition plate 43. The upper end of the filter screen 44 is provided with a first wedge-shaped block 456, and the end of the dust removal brush 45 close to the filter screen 44 is provided with a second wedge-shaped block 441 matched with the first wedge-shaped block 456. The first wedge-shaped block 456 and the second wedge-shaped block 441 matched therewith are both trapezoidal.

[0031] When the dust removal brush 45 moves downward, the filter screen 44 is pressed to the side of the partition plate 43 through the inclined surface matched by the first wedge-shaped block 456 and the second wedge-shaped block 441. After passing the second wedge-shaped block 441, the filter screen 44 is reciprocatingly shaken under the elastic force of the compression spring, so that the smoke dust attached to the filter screen 44 is shaken off into the dust collecting box 7 for collection.

[0032] Embodiment 2 is as shown in Figure 3 The same parts as those in Embodiment 1 are not described herein again. The difference between Embodiment 2 and Embodiment 1 is that the limiting mechanism is an electromagnetic strip 49, the slide plate 46 is provided with iron sheets on both sides, and the heat exchange chamber is provided with an air pressure sensor 491 and a controller. The controller is electrically connected with the air pressure sensor 491, the electromagnetic strip 49 and the push rod 47, respectively. The controller is used to control the on-off of the electromagnetic strip 49 according to the detection value of the air pressure sensor 491. When the air pressure sensor 491 detects that the temperature in the heat exchange chamber reaches the set upper limit value, the controller controls the electromagnetic strip 49 to be powered off, so that the slide plate 46 slides to the sliding end point under the air pressure, thereby making the smoke outlet communicate with the heat exchange chamber. The flue gas in the heat exchange chamber is quickly discharged from the smoke outlet, thereby reducing the air pressure in the heat exchange chamber. When the air pressure is reduced to the set lower limit value, the controller controls the electromagnetic strip 49 to be powered on, and controls the push rod 47 to extend and retract once to push the slide plate 46 back to the original position and be limited by the electromagnetic strip 49.

[0033] The above is only an embodiment of the present application, and the common knowledge of specific structures and characteristics in the scheme is not described herein. It should be pointed out that for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should be regarded as the protection scope of the present application. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and the like recorded in the specification can be used to explain the content of the claims.

Claims

1. A device for extracting rare and precious metals from waste residue, characterized in that: The system includes a feeding mechanism, a converter, and a vacuum furnace connected sequentially along the production steps. The flue gas outlet of the converter is connected to a flue pipe, which contains a water-cooled flue, a dust removal mechanism, and a heat exchanger. A desulfurization device is connected to the end of the flue pipe. The lead slag from the converter is transferred to the side-blown reduction furnace of the refining slag process via a transfer trolley. The liquid inlet of the vacuum furnace is connected to the liquid outlet of the converter. The vacuum furnace includes a primary vacuum furnace and a secondary vacuum furnace connected sequentially. The lead-containing crude tin produced by the primary vacuum furnace is sent to the secondary vacuum furnace. The secondary vacuum furnace produces refined tin and lead-tin alloy. The lead-tin alloy produced by the secondary vacuum furnace is returned to the primary vacuum furnace. The feeding mechanism includes a feeding conveyor belt and a preheating chamber. The preheating chamber is located above the feed inlet of the converter. Preheating tubes are wound around the side walls of the preheating chamber. The heat exchanger is a tubular heat exchanger. The water medium pipe of the heat exchanger is connected to the cooling water pipe of the water-cooled flue, and the cooling water pipe is connected to the preheating tubes. A partition is provided between the heat exchanger and the water-cooled flue. The partition is equipped with a one-way valve that allows flue gas to flow from the water-cooled flue to the heat exchanger only. A sliding plate parallel to the partition is provided on the other side of the heat exchanger. The sliding plate can slide back and forth along the length of the flue. The sliding plate and the flue together form a primary heat exchange chamber. Limiting mechanisms are provided on both sides of the sliding start point of the sliding plate. The limiting mechanisms are released after the air pressure in the primary heat exchange chamber reaches a set value. A push rod is provided at the sliding end point of the sliding plate. The push rod can push the sliding plate back to the starting point and be limited again by the limiting mechanism. A flue is provided near the sliding end point of the flue. The dust removal mechanism is located in the primary heat exchange chamber. It includes a filter screen parallel to the partition and a dust removal brush that moves vertically up and down. The dust removal brush is horizontally positioned and in contact with the heat exchange tubes. A rotating rod and a guide rod are respectively located at both ends of the dust removal brush. A spiral spring is connected to the upper end of the rotating rod, which is threaded. The dust removal brush is threadedly connected to the rotating rod and slidably connected to the guide rod. A pull rope is wound around the rotating rod, with one end detachably fixed to a sliding plate. The direction in which the pull rope pulls the rotating rod is opposite to the direction in which the spiral spring drives the rotating rod.

2. The apparatus for extracting rare and precious metals from waste residue according to claim 1, characterized in that: There are two secondary vacuum furnaces, which are connected in sequence.

3. The apparatus for extracting rare and precious metals from waste residue according to claim 1, characterized in that: The filter screen is slidably connected to the flue and a compression spring is provided between the flue and the partition. A first wedge block is provided at the upper end of the filter screen, and a second wedge block that cooperates with the first wedge block is provided at the end of the dust removal brush near the filter screen. Both the first wedge block and the second wedge block are trapezoidal.

4. The apparatus for extracting rare and precious metals from waste residue according to claim 1, characterized in that: The limiting mechanism is an arc-shaped protrusion. A switch is installed in the smoke pipe at the sliding end point. The switch is electrically connected to the push rod. When the slide reaches the sliding end point, the switch is pressed. After a delay of 3-10 seconds after the switch is pressed, the push rod extends and retracts once to push the slide back to its original position.

5. The apparatus for extracting rare and precious metals from waste residue according to claim 1, characterized in that: The limiting mechanism is an electromagnetic strip, and iron plates are installed on both sides of the slide plate. The primary heat exchange chamber is equipped with a pressure sensor and a controller. The controller is electrically connected to the pressure sensor and the electromagnetic strip respectively. The controller is used to control the on / off state of the electromagnetic strip according to the detection value of the pressure sensor.

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