A device for producing sulfuric acid from pyrite and a preparation method thereof

Abstract

The present invention relates to the technical field of sulfuric acid production, and in particular to a device and a preparation method for producing sulfuric acid from pyrite, comprising an absorption furnace, wherein the top of the absorption furnace is fixedly connected with an exhaust pipe, the lower side of the absorption furnace is fixedly connected with an air inlet pipe and a liquid discharge pipe, one end of the liquid discharge pipe is fixedly connected with a liquid storage tank, a liquid pump is fixedly installed on the liquid storage tank, the liquid inlet end of the liquid pump is fixedly connected with the liquid storage tank, and the liquid discharge end of the liquid pump is fixedly connected with a first connecting pipe; the present invention transports concentrated sulfuric acid in the liquid storage tank to the interior of the absorption furnace through the liquid pump, and dilutes it during the transportation process, so that the diluted sulfuric acid contacts and reacts with sulfur trioxide gas in the absorption furnace and flows back to the interior of the liquid storage tank after the sulfuric acid concentration is increased again, thereby reducing the continuous supply of dilute sulfuric acid in the sulfuric acid production process and reducing the raw material cost in the sulfuric acid production process.

Description

Technical Field

[0001] The invention relates to the technical field of sulfuric acid production, and in particular to a device for producing sulfuric acid from pyrite and a preparation method thereof. Background Art

[0002] Pyrite is a common sulfide ore. In the process of producing sulfuric acid from pyrite, the pyrite needs to be pyrolyzed to generate sulfur dioxide, and the sulfur dioxide is oxidized to sulfur trioxide. The sulfur trioxide gas is then brought into contact with dilute sulfuric acid so that the sulfur trioxide gas is absorbed by the dilute sulfuric acid and generates concentrated sulfuric acid.

[0003] The patent document with publication number CN114590782A discloses a device and method for directly producing electronic-grade sulfuric acid from pyrite. The device includes: a roasting device: used for roasting pyrite or sulfur to produce sulfur dioxide furnace gas; a purification device connected to the roasting device: used for purifying the sulfur dioxide furnace gas to obtain pure sulfur dioxide furnace gas; a drying device connected to the purification device: used for drying the pure sulfur dioxide furnace gas to obtain dry sulfur dioxide furnace gas; and a sulfur dioxide conversion device connected to the drying device.

[0004] In the prior art, when sulfuric acid is produced from pyrite, sulfur trioxide gas generated by the reaction of pyrite is usually passed into an absorption furnace and brought into contact with dilute sulfuric acid. During the process of continuously passing sulfur trioxide gas into the absorption furnace, dilute sulfuric acid as an absorbent needs to be continuously passed into the furnace at the same time, resulting in a large demand for absorbent and increasing the raw material cost of sulfuric acid production. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a device and a preparation method for producing sulfuric acid from pyrite.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is: a device for producing sulfuric acid from pyrite, comprising an absorption furnace, the top of the absorption furnace is fixedly connected with an exhaust pipe, the lower side of the absorption furnace is fixedly connected with an air inlet pipe and a liquid discharge pipe, one end of the liquid discharge pipe is fixedly connected with a liquid storage tank, a liquid pump is fixedly installed on the liquid storage tank, the liquid inlet end of the liquid pump is fixedly connected with the liquid storage tank, the liquid discharge end of the liquid pump is fixedly connected with a first connecting pipe, an atomizing nozzle is arranged above the inside of the absorption furnace, the top of the atomizing nozzle is fixedly connected with a second connecting pipe, one end of the second connecting pipe passes through the absorption furnace and extends to the outside of the absorption furnace;

[0007] The absorption furnace is internally connected with an absorption lifting mechanism and a quantitative liquid discharge mechanism, a sulfuric acid dilution mechanism is connected between the first connecting pipe and the second connecting pipe, an overflow pipe is fixedly connected to the liquid storage tank, a one-way liquid discharge valve is fixedly installed on the overflow pipe, and a pressurized discharge mechanism is internally connected to the liquid storage tank.

[0008] Preferably, the absorption lifting mechanism includes a support frame, which is fixedly connected to the bottom surface of the absorption furnace, and a plurality of planar porous plates are fixedly connected to the top of the support frame. The plurality of planar porous plates are all located above the air inlet pipe and the liquid discharge pipe, and below the atomizing nozzle.

[0009] Preferably, the quantitative drainage mechanism includes an arc-shaped baffle, which is arranged on the inner wall of the absorption furnace and located at the connection point between the absorption furnace and the drainage pipe. Two sliding bars are fixedly connected inside the absorption furnace, and the arc-shaped baffle is slidably connected between the two sliding bars. The tops of the two sliding bars are commonly fixedly connected with a baffle, and a fixed bracket is fixedly connected to the arc-shaped baffle, and a float is fixedly connected to the fixed bracket.

[0010] Preferably, the sulfuric acid dilution mechanism includes a circular cylinder, which is fixedly connected to the second connecting pipe, and the open end of the circular cylinder is fixedly connected to a circular plate, and two fan-shaped grooves are provided on the circular plate along the circumferential direction, and the fan-shaped grooves both have a circular arc angle of 90 degrees, and the end of the circular plate away from the circular cylinder is fixedly connected to a first semi-cylinder and a second semi-cylinder, and the two fan-shaped grooves are respectively located inside the first semi-cylinder and the second semi-cylinder, and the first semi-cylinder is fixedly connected to a water inlet pipe, and the first connecting pipe is fixedly connected to the second semi-cylinder, and a rotating shaft is arranged between the first semi-cylinder and the second semi-cylinder, and the rotating shaft is rotatably connected to the axis center of the circular plate, and a semi-circular baffle is arranged on the end of the circular plate close to the circular cylinder, and the semi-circular baffle is fixedly connected to one end of the rotating shaft, and a first motor is fixedly installed on the first semi-cylinder and the second semi-cylinder, and the output shaft of the first motor is fixedly connected to the other end of the rotating shaft.

[0011] Preferably, a connecting shaft is rotatably connected inside the circular cylinder, a plurality of stirring blades are fixedly connected to the surface of the connecting shaft, a second motor is fixedly mounted on the circular cylinder, and an output shaft of the second motor is fixedly connected to one end of the connecting shaft.

[0012] Preferably, the pressurized discharge mechanism includes a circular ring, which is fixedly connected to the inside of the liquid storage tank, the fixed connection between the liquid storage tank and the overflow pipe is located at the axis of one end of the circular ring, and connecting holes are provided on both sides of the circular ring close to the end of the overflow pipe. A piston is slidably sealed inside the circular ring, and a limiting rod is fixedly connected to the end of the piston away from the overflow pipe. A limiting bracket is fixedly connected to the circular ring, and the limiting rod is slidably limited on the limiting bracket. An arc pin is fixedly connected to the limiting rod, and a rotating bracket is fixedly connected to the inside of the liquid storage tank. A guide ring is rotatably connected to the interior of the rotating bracket, and a beveled ring groove is opened inside the guide ring, one end of the arc pin is located in the beveled ring groove, and the surface of the guide ring is fixedly connected to two connecting cross bars along the circumferential direction, and one end of each connecting cross bar is fixedly connected to an arc plate, and both of the two arc plates are in contact with the surface of the circular ring and are located between the two connecting holes, one end of the guide ring is fixedly connected to a fixed shaft, and a third motor is fixedly installed on the liquid storage tank, and the output shaft of the third motor passes through the liquid storage tank and extends to the interior of the liquid storage tank and is fixedly connected to one end of the fixed shaft.

[0013] A method for preparing a device for producing sulfuric acid from pyrite, the method comprising the following steps:

[0014] Step 1: The concentrated sulfuric acid in the liquid storage tank is transported to the inside of the first connecting pipe by the action of the liquid pump, and flows along the first connecting pipe to the second connecting pipe. When the concentrated sulfuric acid flows from the inside of the first connecting pipe to the inside of the second connecting pipe, the concentrated sulfuric acid is diluted by water injection through the action of the sulfuric acid dilution mechanism, and the diluted concentrated sulfuric acid enters the atomizing nozzle along the second connecting pipe, and then is atomized and sprayed into the inside of the absorption furnace along the atomizing nozzle;

[0015] Step 2: At the same time, sulfur trioxide gas is transported along the air inlet pipe to the inside of the absorption furnace. The sulfur trioxide gas floats upward inside the absorption furnace and countercurrently contacts with the diluted sulfuric acid sprayed out by atomization inside the absorption furnace, reacts to generate sulfuric acid and dissolves in the diluted sulfuric acid, so that the diluted sulfuric acid becomes concentrated sulfuric acid again, and flows back into the liquid storage tank along the connection between the absorption furnace and the drain pipe. After the sulfur trioxide gas contacts and reacts with the diluted sulfuric acid, the waste gas generated is discharged along the exhaust pipe at the top of the absorption furnace;

[0016] Step 3: As the concentrated sulfuric acid is continuously diluted by water injection, the total amount of sulfuric acid in the circulation process increases continuously, so that the total amount of sulfuric acid flowing back into the liquid storage tank increases continuously. When the concentrated sulfuric acid level inside the liquid storage tank is higher than the fixed connection between the overflow pipe and the liquid storage tank, the concentrated sulfuric acid at the connection is discharged along the overflow pipe.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The concentrated sulfuric acid in the liquid storage tank is transported to the absorption furnace through a liquid pump and diluted during the transportation process, so that the diluted sulfuric acid contacts and reacts with the sulfur trioxide gas in the absorption furnace and flows back to the liquid storage tank after the sulfur trioxide gas is increased again in concentration. The sulfur trioxide gas generated by the pyrite reaction circulates through the concentrated sulfuric acid in the liquid storage tank during the production of sulfuric acid, and is continuously diluted and reacted and purified during the flow process, thereby reducing the continuous supply of dilute sulfuric acid in the sulfuric acid production process and reducing the raw material cost in the sulfuric acid production process.

[0019] 2. In the process of continuous dilution of concentrated sulfuric acid inside the liquid storage tank and re-increasing the sulfuric acid concentration, as the concentrated sulfuric acid is continuously diluted by water injection, the total amount of sulfuric acid in the circulation process continues to increase, thereby increasing the total amount of sulfuric acid flowing back into the liquid storage tank. When the concentrated sulfuric acid level inside the liquid storage tank is higher than the fixed connection between the overflow pipe and the liquid storage tank, the concentrated sulfuric acid at the connection is discharged along the overflow pipe, thereby discharging and collecting the excess concentrated sulfuric acid inside the liquid storage tank, ensuring the normal circulation of sulfuric acid between the liquid storage tank and the absorption furnace.

[0020] 3. When the liquid level of concentrated sulfuric acid drops to the top of the connection between the absorption furnace and the drain pipe, the float loses the buoyancy of the concentrated sulfuric acid, and under the action of gravity, the arc-shaped baffle returns to the initial position and blocks the connection between the absorption furnace and the drain pipe again, so that when the drain pipe discharges the concentrated sulfuric acid, the liquid level of concentrated sulfuric acid is always at the top of the connection between the drain pipe and the absorption furnace, preventing sulfur trioxide gas from entering the drain pipe when the drain pipe is discharging.

[0021] 4. After the concentrated sulfuric acid enters the second semi-cylinder along the first connecting pipe, the flow rate of the concentrated sulfuric acid and the dilution water source entering the circular cylinder is adjusted according to the degree of shielding of the two fan-shaped grooves by the semi-circular baffle, and the diluted sulfuric acid flows into the second connecting pipe along the inside of the circular cylinder, thereby adjusting the dilution degree of the concentrated sulfuric acid, so that the dilution degree of the concentrated sulfuric acid can be flexibly adjusted according to the actual production reaction conditions.

[0022] 5. The piston returns to its initial position through the rotational guidance of the bevel ring groove on the arc surface pin, and the arc plate is separated from the corresponding connecting hole, so that the concentrated sulfuric acid inside the liquid storage tank continues to enter the inside of the circular ring along the connecting hole. When the liquid level of the concentrated sulfuric acid inside the liquid storage tank is higher than the fixed connecting point between the overflow pipe and the liquid storage tank, the concentrated sulfuric acid above the overflow pipe can be continuously hydraulically discharged. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention;

[0024] Figure 2 It is a partial structural cross-sectional schematic diagram of the present invention (the absorption furnace is cut);

[0025] Figure 3 For the present invention Figure 2 A schematic diagram of the structure enlargement at point A;

[0026] Figure 4 For the present invention Figure 2 A schematic diagram of the structure at B in FIG.

[0027] Figure 5 It is an exploded schematic diagram of the cooperation structure of the circular cylinder, the first semi-cylinder and the second semi-cylinder of the present invention;

[0028] Figure 6 It is a schematic diagram of the coordination structure of the circular cylinder, the connecting shaft and the stirring blade of the present invention;

[0029] Figure 7 It is a schematic diagram of the matching structure of the liquid storage tank, the overflow pipe and the circular ring of the present invention (the liquid storage tank is cut);

[0030] Figure 8 It is a cross-sectional schematic diagram of the matching structure of the circular ring, the limiting rod and the guide ring of the present invention;

[0031] Fig. 9 It is a schematic diagram of the guide ring structure of the present invention.

[0032] In the figure: 1, absorption furnace; 2, exhaust pipe; 3, air inlet pipe; 4, liquid discharge pipe; 5, liquid storage tank; 6, liquid pump; 7, first connecting pipe; 8, atomizing nozzle; 9, second connecting pipe; 10, overflow pipe; 11, one-way liquid discharge valve; 12, support frame; 13, plane porous plate; 14, arc baffle; 15, sliding bar; 16, baffle; 17, fixed bracket; 18, buoy; 19, circular cylinder; 20, circular plate; 21, fan-shaped groove; 22, first semi-circular cylinder; 23. Second semi-cylinder; 24. Water inlet pipe; 25. Rotating shaft; 26. Semicircular baffle; 27. First motor; 28. Connecting shaft; 29. ​​Stirring blade; 30. Second motor; 31. Circular ring; 32. Connecting hole; 33. Piston; 34. Limit rod; 35. Limit bracket; 36. Arc pin; 37. Rotating bracket; 38. Guide ring; 3801. Connecting cross bar; 39. Bevel ring groove; 40. Arc plate; 41. Fixed shaft; 42. Third motor. DETAILED DESCRIPTION

[0033] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0034] like Figures 1 to 9The device for producing sulfuric acid from pyrite shown in the figure comprises an absorption furnace 1, the top of the absorption furnace 1 is fixedly connected with an exhaust pipe 2, the lower part of the side of the absorption furnace 1 is fixedly connected with an air inlet pipe 3 and a liquid discharge pipe 4, one end of the liquid discharge pipe 4 is fixedly connected with a liquid storage tank 5, a liquid pump 6 is fixedly installed on the liquid storage tank 5, the liquid inlet end of the liquid pump 6 is fixedly connected with the liquid storage tank 5, the liquid discharge end of the liquid pump 6 is fixedly connected with a first connecting pipe 7, an atomizing nozzle 8 is arranged above the inside of the absorption furnace 1, the top of the atomizing nozzle 8 is fixedly connected with a second connecting pipe 9, one end of the second connecting pipe 9 passes through the absorption furnace 1 and extends to the outside of the absorption furnace 1;

[0035] The absorption furnace 1 is internally connected with an absorption lifting mechanism and a quantitative liquid discharge mechanism, a sulfuric acid dilution mechanism is connected between the first connecting pipe 7 and the second connecting pipe 9, an overflow pipe 10 is fixedly connected to the liquid storage tank 5, a one-way liquid discharge valve 11 is fixedly installed on the overflow pipe 10, and a pressurized discharge mechanism is connected inside the liquid storage tank 5; when working, when the prior art produces sulfuric acid through pyrite, sulfur trioxide gas generated by the reaction of pyrite is usually introduced into the absorption furnace 1 and contacted with dilute sulfuric acid. In the process of continuously introducing sulfur trioxide gas into the absorption furnace 1, it is necessary to continuously introduce dilute sulfuric acid as an absorbent into the absorption furnace 1 at the same time, thereby causing a large demand for absorbent and increasing the raw material cost of sulfuric acid production; this technical solution can To solve the above problems, the specific working method is as follows: the concentrated sulfuric acid in the liquid storage tank 5 is transported to the inside of the first connecting pipe 7 through the action of the liquid pump 6, and flows along the first connecting pipe 7 to the second connecting pipe 9. When the concentrated sulfuric acid flows from the inside of the first connecting pipe 7 to the inside of the second connecting pipe 9, the concentrated sulfuric acid is diluted by water injection through the action of the sulfuric acid dilution mechanism, and the diluted concentrated sulfuric acid enters the atomizing nozzle 8 along the second connecting pipe 9, and then is atomized and sprayed into the inside of the absorption furnace 1 along the atomizing nozzle 8. At the same time, sulfur trioxide gas is transported to the inside of the absorption furnace 1 along the air inlet pipe 3. The sulfur trioxide gas floats upward inside the absorption furnace 1 and countercurrently contacts with the diluted sulfuric acid atomized and sprayed from the absorption furnace 1 to react and generate sulfur trioxide. The sulfuric acid is dissolved in the diluted sulfuric acid, so that the concentration of the diluted sulfuric acid increases with the addition of the sulfuric acid generated by the absorption, and becomes concentrated sulfuric acid again, and flows back into the liquid storage tank 5 along the connection between the absorption furnace 1 and the drain pipe 4. After the sulfur trioxide gas contacts and reacts with the diluted sulfuric acid, the waste gas generated is discharged along the exhaust pipe 2 at the top of the absorption furnace 1. The concentrated sulfuric acid in the liquid storage tank 5 is transported to the inside of the absorption furnace 1 by the liquid pump 6, and is diluted during the transportation process, so that the diluted sulfuric acid contacts and reacts with the sulfur trioxide gas in the absorption furnace 1 and flows back to the liquid storage tank 5 after the sulfur trioxide gas is increased again in concentration, so that the sulfur trioxide gas generated by the pyrite reaction passes through the concentrated sulfur in the liquid storage tank 5 during the production of sulfuric acid. The acid circulates and is continuously diluted and purified by reaction during the flow process, thereby reducing the continuous supply of dilute sulfuric acid in the sulfuric acid production process and reducing the raw material cost in the sulfuric acid production process. In the process of continuous dilution of the concentrated sulfuric acid inside the liquid storage tank 5 and re-increasing the sulfuric acid concentration, as the concentrated sulfuric acid is continuously diluted by water injection, the total amount of sulfuric acid in the circulation process continues to increase, thereby increasing the total amount of sulfuric acid flowing back into the liquid storage tank 5. When the concentrated sulfuric acid level inside the liquid storage tank 5 is higher than the fixed connection between the overflow pipe 10 and the liquid storage tank 5, the concentrated sulfuric acid at the connection is discharged along the overflow pipe 10, thereby discharging and collecting the excess concentrated sulfuric acid inside the liquid storage tank 5, ensuring the normal circulation of sulfuric acid between the liquid storage tank 5 and the absorption furnace 1.

[0036] As a further implementation scheme of the present invention, the absorption and lifting mechanism includes a support frame 12, which is fixedly connected to the bottom surface of the absorption furnace 1, and a plurality of planar porous plates 13 are fixedly connected to the top of the support frame 12, and the plurality of planar porous plates 13 are all located above the air inlet pipe 3 and the liquid discharge pipe 4, and below the atomizing nozzle 8; when working, by arranging a plurality of planar porous plates 13 inside the absorption furnace 1, the interior of the absorption furnace 1 is divided into a multi-stage air chamber, and the gas is dispersed, so that the sulfur trioxide gas transported from the air inlet pipe 3 to the absorption furnace 1 is dispersed in the multi-stage air chamber formed by the planar porous plates 13 during the upward floating process, and the diluted sulfuric acid sprayed from the atomizing nozzle 8 is in contact with the dispersed sulfur trioxide gas during the downward flowing along the planar porous plates 13, thereby greatly increasing the gas-liquid contact area and improving the reaction generation effect of sulfuric acid.

[0037] As a further embodiment of the present invention, the quantitative drainage mechanism includes an arc-shaped baffle 14, which is arranged on the inner wall of the absorption furnace 1 and located at the connection between the absorption furnace 1 and the drainage pipe 4. Two sliding bars 15 are fixedly connected inside the absorption furnace 1. The arc-shaped baffle 14 is slidably connected between the two sliding bars 15. The tops of the two sliding bars 15 are commonly fixedly connected with a baffle 16. A fixed bracket 17 is fixedly connected to the arc-shaped baffle 14, and a float 18 is fixedly connected to the fixed bracket 17. When working, the connection between the absorption furnace 1 and the drainage pipe 4 is blocked and sealed by the arc-shaped baffle 14 to prevent sulfur trioxide gas from entering the absorption furnace 1 along the air inlet pipe 3 and then entering the liquid storage tank 5 along the drainage pipe 4. When the concentrated sulfuric acid liquid level inside the absorption furnace 1 is located at the top of the connection between the absorption furnace 1 and the drainage pipe 4, The float 18 contacts the concentrated sulfuric acid inside the absorption furnace 1, and when the concentrated sulfuric acid inside the absorption furnace 1 continues to increase, the float 18 moves upward under the action of buoyancy and drives the fixed bracket 17 to rise, so that the arc baffle 14 moves upward along the sliding connection of the sliding bar 15, so that the concentrated sulfuric acid inside the absorption furnace 1 is discharged along the drain pipe 4, and when the liquid level of the concentrated sulfuric acid drops to the top of the connection between the absorption furnace 1 and the drain pipe 4, the float 18 loses the buoyancy of the concentrated sulfuric acid, and under the action of gravity, the arc baffle 14 returns to the initial position and blocks the connection between the absorption furnace 1 and the drain pipe 4 again, so that when the drain pipe 4 discharges the concentrated sulfuric acid, the liquid level of the concentrated sulfuric acid is always located at the top of the connection between the drain pipe 4 and the absorption furnace 1, preventing sulfur trioxide gas from entering the drain pipe 4 when the drain pipe 4 is discharging.

[0038] As a further embodiment of the present invention, the sulfuric acid dilution mechanism includes a circular cylinder 19, which is fixedly connected to the second connecting pipe 9, and a circular plate 20 is fixedly connected to the open end of the circular cylinder 19. Two fan-shaped grooves 21 are provided on the circular plate 20 along the circumferential direction, and the fan-shaped grooves 21 are both at a 90-degree arc angle. The end of the circular plate 20 away from the circular cylinder 19 is fixedly connected to a first semi-cylinder 22 and a second semi-cylinder 23, and the two fan-shaped grooves 21 are respectively located inside the first semi-cylinder 22 and the second semi-cylinder 23. The first semi-cylinder 22 is fixedly connected to a water inlet pipe 24, and the first connecting pipe 7 is fixedly connected to the second semi-cylinder 23. A rotating shaft 25 is arranged between the first semi-cylinder 22 and the second semi-cylinder 23, and the rotating shaft 25 is rotatably connected to the axis of the circular plate 20. A semi-circular baffle 26 is arranged on the end of the circular plate 20 close to the circular cylinder 19, and the semi-circular baffle 26 is fixedly connected to one end of the rotating shaft 25. The first semi-cylinder 22 and the first semi-cylinder 23 are fixedly connected to the first semi-cylinder 22. A first motor 27 is fixedly installed on the two semi-cylinders 23, and the output shaft of the first motor 27 is fixedly connected to the other end of the rotating shaft 25. During operation, the rotating shaft 25 is driven to rotate at the rotating connection of the circular plate 20 by the rotation of the output shaft of the first motor 27, so that the semi-circular baffle 26 is rotated, and the degree of shielding of the two fan-shaped grooves 21 is adjusted by the rotation of the semi-circular baffle 26. A water source pipeline is connected to the water inlet pipe 24, so that the dilution water source enters the first semi-cylinder 22 along the water inlet pipe 24, and after the concentrated sulfuric acid enters the second semi-cylinder 23 along the first connecting pipe 7, the flow rate of the concentrated sulfuric acid and the dilution water source entering the circular cylinder 19 is adjusted according to the degree of shielding of the two fan-shaped grooves 21 by the semi-circular baffle 26, and the diluted sulfuric acid flows into the second connecting pipe 9 along the circular cylinder 19, so as to adjust the dilution degree of the concentrated sulfuric acid, so that the dilution degree of the concentrated sulfuric acid can be flexibly adjusted according to the actual production reaction conditions.

[0039] As a further embodiment of the present invention, the inner rotation of the circular cylinder 19 is connected to a connecting shaft 28 (such as Figure 6 As shown, a plurality of stirring blades 29 are fixedly connected to the surface of the connecting shaft 28, and a second motor 30 (as shown in FIG. Figure 4 and Figure 5 As shown in the figure, the output shaft of the second motor 30 is fixedly connected to one end of the connecting shaft 28; when working, the connecting shaft 28 is driven to rotate synchronously by the rotation of the output shaft of the second motor 30, so that the multiple stirring blades 29 rotate and stir inside the circular cylinder 19, so that the concentrated sulfuric acid and the dilution water source enter the interior of the circular cylinder 19 along the corresponding fan-shaped grooves 21 respectively, and then the concentrated sulfuric acid and the dilution water source are quickly mixed and diluted by the rotation and stirring of the stirring blades 29, thereby improving the dilution effect of the concentrated sulfuric acid.

[0040] As a further embodiment of the present invention, the pressurized discharge mechanism includes a circular ring 31, which is fixedly connected to the inside of the liquid storage tank 5. The fixed connection between the liquid storage tank 5 and the overflow pipe 10 is located at the axis of one end of the circular ring 31. Both sides of the circular ring 31 close to the end of the overflow pipe 10 are provided with connecting holes 32. The inside of the circular ring 31 is slidably sealed with a piston 33. The end of the piston 33 away from the overflow pipe 10 is fixedly connected to a limiting rod 34. A limiting bracket 35 is fixedly connected to the circular ring 31. The limiting rod 34 is slidably limited on the limiting bracket 35. An arc pin 36 is fixedly connected to the limiting rod 34. The inside of the liquid storage tank 5 is fixedly connected to a rotating bracket 37 , a guide ring 38 is rotatably connected inside the rotating bracket 37, a beveled ring groove 39 is provided inside the guide ring 38, one end of the arc pin 36 is located in the beveled ring groove 39, and two connecting cross bars 3801 are fixedly connected to the surface of the guide ring 38 along the circumferential direction, and one end of the connecting cross bars 3801 is fixedly connected to an arc plate 40, and the two arc plates 40 are in contact with the surface of the circular ring 31 and are located between the two connecting holes 32, one end of the guide ring 38 is fixedly connected to a fixed shaft 41, and a third motor 42 is fixedly installed on the liquid storage tank 5, and the output shaft of the third motor 42 passes through the liquid storage tank 5 and extends to the inside of the liquid storage tank 5 and is fixedly connected to one end of the fixed shaft 41;During operation, a one-way drain valve 11 is installed on the overflow pipe 10 so that the overflow pipe 10 can only drain in one direction, thereby preventing the concentrated sulfuric acid inside the liquid storage tank 5 from communicating with the external air through the overflow pipe 10 and undergoing a water absorption reaction. However, after the one-way drain valve 11 is installed on the overflow pipe 10, the overflow pipe 10 needs to be under a certain hydraulic pressure to discharge sulfuric acid to the outside, thereby easily reducing the drainage efficiency of the overflow pipe 10. When the concentrated sulfuric acid level inside the liquid storage tank 5 is higher than the fixed connection between the overflow pipe 10 and the liquid storage tank 5, the concentrated sulfuric acid enters the interior of the circular ring 31 along the connecting hole 32 and is located between the overflow pipe 10 and the piston 33. The fixed shaft 41 is driven to rotate by the output shaft of the third motor 42, thereby causing the guide ring 38 to rotate in one direction inside the rotating bracket 37. During the rotation, the guide ring 38 drives the connecting cross bar 3801 to rotate synchronously, so that the two arc plates 40 rotate synchronously with the guide ring 38 The connecting holes 32 on both sides are blocked, and the arc pin 36 moves toward the overflow pipe 10 under the rotation guidance of the inclined ring groove 39, so that the limit rod 34 moves along the sliding connection of the limit bracket 35, so that the piston 33 moves inside the circular ring 31, and the concentrated sulfuric acid inside the circular ring 31 is discharged along the overflow pipe 10, so that the concentrated sulfuric acid inside the liquid storage tank 5 is discharged through hydraulic pressure, and when the fixed shaft 41 continues to rotate, the piston 33 returns to the initial position through the rotation guidance of the inclined ring groove 39 on the arc pin 36, and the arc plate 40 is separated from the corresponding connecting hole 32, so that the concentrated sulfuric acid inside the liquid storage tank 5 continues to enter the inside of the circular ring 31 along the connecting hole 32, so that when the concentrated sulfuric acid level inside the liquid storage tank 5 is higher than the overflow pipe 10 and the fixed connection of the liquid storage tank 5, the concentrated sulfuric acid that exceeds the overflow pipe 10 can be continuously discharged by hydraulic pressure. ;

[0041] A method for preparing a device for producing sulfuric acid from pyrite, the method comprising the following steps:

[0042] Step 1: The concentrated sulfuric acid in the liquid storage tank 5 is transported to the inside of the first connecting pipe 7 by the action of the liquid pump 6, and flows along the first connecting pipe 7 to the second connecting pipe 9. When the concentrated sulfuric acid flows from the inside of the first connecting pipe 7 to the inside of the second connecting pipe 9, the concentrated sulfuric acid is diluted by water injection through the action of the sulfuric acid dilution mechanism, and the diluted concentrated sulfuric acid enters the atomizing nozzle 8 along the second connecting pipe 9, and then is atomized and sprayed into the inside of the absorption furnace 1 along the atomizing nozzle 8;

[0043] Step 2: At the same time, sulfur trioxide gas is transported along the air inlet pipe 3 to the inside of the absorption furnace 1. The sulfur trioxide gas floats upward inside the absorption furnace 1 and countercurrently contacts with the diluted sulfuric acid sprayed out by atomization inside the absorption furnace 1, reacts to generate sulfuric acid and dissolves in the diluted sulfuric acid, so that the diluted sulfuric acid becomes concentrated sulfuric acid again, and flows back into the liquid storage tank 5 along the connection between the absorption furnace 1 and the drain pipe 4. After the sulfur trioxide gas contacts and reacts with the diluted sulfuric acid, the waste gas generated is discharged along the exhaust pipe 2 at the top of the absorption furnace 1;

[0044] Step 3: As the concentrated sulfuric acid is continuously diluted by water injection, the total amount of sulfuric acid in the circulation process continues to increase, so that the total amount of sulfuric acid flowing back into the liquid storage tank 5 continues to increase. When the concentrated sulfuric acid level inside the liquid storage tank 5 is higher than the fixed connection between the overflow pipe 10 and the liquid storage tank 5, the concentrated sulfuric acid at the connection is discharged along the overflow pipe 10.

[0045] Working principle of the present invention:

[0046] The concentrated sulfuric acid in the liquid storage tank 5 is transported to the inside of the first connecting pipe 7 by the action of the liquid pump 6, and flows along the first connecting pipe 7 to the second connecting pipe 9. When the concentrated sulfuric acid flows from the inside of the first connecting pipe 7 to the inside of the second connecting pipe 9, the concentrated sulfuric acid is diluted by water injection through the action of the sulfuric acid dilution mechanism, and the diluted concentrated sulfuric acid enters the atomizing nozzle 8 along the second connecting pipe 9, and then is atomized and sprayed into the inside of the absorption furnace 1 along the atomizing nozzle 8. At the same time, the sulfur trioxide gas is transported to the inside of the absorption furnace 1 along the air inlet pipe 3. The sulfur trioxide gas floats upward in the absorption furnace 1 and countercurrently contacts with the diluted sulfuric acid atomized and sprayed from the absorption furnace 1 to react to generate sulfuric acid and dissolve in the diluted sulfuric acid, so that the concentration of the diluted sulfuric acid increases with the addition of the sulfuric acid generated by the absorption and becomes concentrated sulfuric acid again, and flows back into the liquid storage tank 5 along the connection between the absorption furnace 1 and the drain pipe 4. After the sulfur trioxide gas contacts and reacts with the diluted sulfuric acid, the waste gas generated is discharged along the exhaust pipe 2 at the top of the absorption furnace 1. The liquid storage tank 5 is pumped by the liquid pump 6. The concentrated sulfuric acid inside is transported to the inside of the absorption furnace 1 and is diluted during the transportation process, so that the diluted sulfuric acid contacts and reacts with the sulfur trioxide gas inside the absorption furnace 1 and increases the sulfuric acid concentration again before flowing back to the liquid storage tank 5, so that the sulfur trioxide gas generated by the pyrite reaction circulates through the concentrated sulfuric acid inside the liquid storage tank 5 during the production of sulfuric acid, and is continuously diluted and reacted and purified during the flow process, thereby reducing the continuous supply of dilute sulfuric acid in the sulfuric acid production process and reducing the raw material cost in the sulfuric acid production process. In the process of continuous dilution of the concentrated sulfuric acid inside the liquid storage tank 5 and increasing the sulfuric acid concentration again, as the concentrated sulfuric acid is continuously diluted by water injection, the total amount of sulfuric acid in the circulation process continues to increase, thereby increasing the total amount of sulfuric acid flowing back to the liquid storage tank 5. When the concentrated sulfuric acid level inside the liquid storage tank 5 is higher than the fixed connection between the overflow pipe 10 and the liquid storage tank 5, the concentrated sulfuric acid at the connection is discharged along the overflow pipe 10, thereby discharging and collecting the excess concentrated sulfuric acid inside the liquid storage tank 5, and ensuring the normal circulation of sulfuric acid between the liquid storage tank 5 and the absorption furnace 1.

[0047] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions only describe the principles of the present invention. The present invention may have various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention to be protected, and the scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A device for producing sulfuric acid from pyrite, comprising an absorption furnace (1), characterized in that: The top of the absorption furnace (1) is fixedly connected to an exhaust pipe (2); the lower side of the absorption furnace (1) is fixedly connected to an air inlet pipe (3) and a liquid discharge pipe (4); one end of the liquid discharge pipe (4) is fixedly connected to a liquid storage tank (5); a liquid pump (6) is fixedly installed on the liquid storage tank (5); the liquid inlet end of the liquid pump (6) is fixedly connected to the liquid storage tank (5); the liquid discharge end of the liquid pump (6) is fixedly connected to a first connecting pipe (7); an atomizing nozzle (8) is arranged above the inside of the absorption furnace (1); the top end of the atomizing nozzle (8) is fixedly connected to a second connecting pipe (9); one end of the second connecting pipe (9) passes through the absorption furnace (1) and extends to the outside of the absorption furnace (1); The absorption furnace (1) is internally connected with an absorption lifting mechanism and a quantitative liquid discharge mechanism, a sulfuric acid dilution mechanism is connected between the first connecting pipe (7) and the second connecting pipe (9), an overflow pipe (10) is fixedly connected to the liquid storage tank (5), a one-way liquid discharge valve (11) is fixedly installed on the overflow pipe (10), and a pressurized discharge mechanism is internally connected to the liquid storage tank (5); The sulfuric acid dilution mechanism comprises a circular cylinder (19), the circular cylinder (19) being fixedly connected to the second connecting pipe (9), the open end of the circular cylinder (19) being fixedly connected to a circular plate (20), the circular plate (20) being provided with two fan-shaped grooves (21) along the circumferential direction, the fan-shaped grooves (21) both having a circular arc angle of 90 degrees, the end of the circular plate (20) away from the circular cylinder (19) being fixedly connected to a first semi-cylinder (22) and a second semi-cylinder (23), the two fan-shaped grooves (21) being respectively located inside the first semi-cylinder (22) and the second semi-cylinder (23), the first semi-cylinder (22) being fixedly connected to a water inlet pipe (24), The first connecting pipe (7) is fixedly connected to the second semi-cylinder (23); a rotating shaft (25) is provided between the first semi-cylinder (22) and the second semi-cylinder (23); the rotating shaft (25) is rotatably connected to the axis of the circular plate (20); a semi-circular baffle (26) is provided at one end of the circular plate (20) close to the circular cylinder (19); the semi-circular baffle (26) is fixedly connected to one end of the rotating shaft (25); a first motor (27) is fixedly mounted on the first semi-cylinder (22) and the second semi-cylinder (23); an output shaft of the first motor (27) is fixedly connected to the other end of the rotating shaft (25).

2. A device for producing sulfuric acid from pyrite according to claim 1, characterized in that: The absorption lifting mechanism comprises a support frame (12), wherein the support frame (12) is fixedly connected to the bottom surface inside the absorption furnace (1), and a plurality of planar porous plates (13) are fixedly connected to the top of the support frame (12), wherein the plurality of planar porous plates (13) are all located above the air inlet pipe (3) and the liquid discharge pipe (4), and below the atomizing nozzle (8).

3. The device for producing sulfuric acid from pyrite according to claim 1, characterized in that: The quantitative liquid discharge mechanism comprises an arc-shaped baffle (14), the arc-shaped baffle (14) being arranged on the inner wall of the absorption furnace (1) and being located at the connection point between the absorption furnace (1) and the liquid discharge pipe (4), the interior of the absorption furnace (1) being fixedly connected with two sliding bars (15), the arc-shaped baffle (14) being slidably connected between the two sliding bars (15), the tops of the two sliding bars (15) being fixedly connected with a baffle (16), the arc-shaped baffle (14) being fixedly connected with a fixed bracket (17), and the fixed bracket (17) being fixedly connected with a float (18).

4. The device for producing sulfuric acid from pyrite according to claim 1, characterized in that: A connecting shaft (28) is rotatably connected inside the circular cylinder (19), a plurality of stirring blades (29) are fixedly connected to the surface of the connecting shaft (28), a second motor (30) is fixedly mounted on the circular cylinder (19), and an output shaft of the second motor (30) is fixedly connected to one end of the connecting shaft (28).

5. The device for producing sulfuric acid from pyrite according to claim 1, characterized in that: The pressurized discharge mechanism comprises a circular ring (31), the circular ring (31) being fixedly connected to the inside of the liquid storage tank (5), the fixed connection point between the liquid storage tank (5) and the overflow pipe (10) being located at the axis of one end of the circular ring (31), the circular ring (31) having two sides close to the end of the overflow pipe (10) having communication holes (32), the inside of the circular ring (31) being slidably sealed with a piston (33), the end of the piston (33) away from the overflow pipe (10) being fixedly connected to a limiting rod (34), the circular ring (31) being fixedly connected to a limiting bracket (35), the limiting rod (34) being slidably limited on the limiting bracket (35), the limiting rod (34) being fixedly connected to an arc surface pin (36), the inside of the liquid storage tank (5) being fixedly connected to a rotating bracket (37), the rotating bracket (37) being A guide ring (38) is rotatably connected inside the bracket (37), a beveled annular groove (39) is provided inside the guide ring (38), one end of the arc surface pin (36) is located in the beveled annular groove (39), the surface of the guide ring (38) is fixedly connected to two connecting cross bars (3801) along the circumferential direction, one end of each connecting cross bar (3801) is fixedly connected to an arc plate (40), both arc plates (40) are in contact with the surface of the circular ring (31) and are located between the two connecting holes (32), one end of the guide ring (38) is fixedly connected to a fixed shaft (41), a third motor (42) is fixedly mounted on the liquid storage tank (5), an output shaft of the third motor (42) passes through the liquid storage tank (5) and extends to the inside of the liquid storage tank (5) and is then fixedly connected to one end of the fixed shaft (41).

6. A method for preparing a device for producing sulfuric acid from pyrite, applicable to the device for producing sulfuric acid from pyrite according to any one of claims 1 to 5, characterized in that: The method comprises the following steps: Step 1: The concentrated sulfuric acid in the liquid storage tank (5) is transported to the inside of the first connecting pipe (7) by the action of the liquid pump (6), and flows along the first connecting pipe (7) to the second connecting pipe (9); when the concentrated sulfuric acid flows from the inside of the first connecting pipe (7) to the inside of the second connecting pipe (9), the concentrated sulfuric acid is diluted by water injection through the action of the sulfuric acid dilution mechanism, and the diluted concentrated sulfuric acid enters the atomizing nozzle (8) along the second connecting pipe (9), and then is atomized and sprayed into the inside of the absorption furnace (1) along the atomizing nozzle (8); Step 2: At the same time, sulfur trioxide gas is transported along the air inlet pipe (3) to the interior of the absorption furnace (1). The sulfur trioxide gas floats upward inside the absorption furnace (1) and countercurrently contacts with the diluted sulfuric acid sprayed out of the absorption furnace (1) by atomization, reacts to generate sulfuric acid and dissolves in the diluted sulfuric acid, thereby making the diluted sulfuric acid become concentrated sulfuric acid again and re-flow into the liquid storage tank (5) along the connection between the absorption furnace (1) and the drain pipe (4). After the sulfur trioxide gas contacts and reacts with the diluted sulfuric acid, the waste gas generated is discharged along the exhaust pipe (2) at the top of the absorption furnace (1); Step 3: As the concentrated sulfuric acid is continuously diluted by water injection, the total amount of sulfuric acid in the circulation process increases continuously, so that the total amount of sulfuric acid flowing back into the liquid storage tank (5) increases continuously. When the liquid level of the concentrated sulfuric acid in the liquid storage tank (5) is higher than the fixed connection point between the overflow pipe (10) and the liquid storage tank (5), the concentrated sulfuric acid at the connection point is discharged along the overflow pipe (10).

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