Mercury recovery device for waste mercury catalyst and recovery method thereof

Abstract

The invention relates to the field of treating waste materials to produce non-ferrous metal compounds, in particular to a mercury recovery device for a waste mercury catalyst and a recovery method of the mercury recovery device. The device comprises a uniform mixing unit for uniformly mixing mercury-containing powder and an adhesive to obtain a uniformly mixed material, a granulation unit for pressing the uniformly mixed material into particles, and a heating unit for heating the particles to obtain mercuric chloride gas, which are sequentially arranged from left to right, a conveying unit for conveying the uniformly mixed material into the granulation unit is arranged between the uniformly mixing unit and the granulation unit, the conveying unit comprises a second discharge port, and a feeding pipe is mounted at the second discharge port; a fourth motor is installed at the bottom of the stand column, the fourth motor is in transmission connection with the pipe body through a third transmission part, an existing mercury recovery device and method for the waste mercury catalyst cannot treat the powdery waste mercury catalyst and effectively recover mercury, and the device and method can treat the powdery waste mercury catalyst and effectively recover mercury.

Description

Technical Field

[0001] The invention relates to the field of processing waste materials to produce nonferrous metal compounds, and in particular to a mercury recovery device for waste mercury catalysts and a recovery method thereof. Background Art

[0002] Polyvinyl chloride (PVC) is one of the five major general-purpose plastics and is widely used in daily life. my country mainly uses the calcium carbide acetylene method (abbreviated as calcium carbide method) to produce PVC. The output of PVC produced by the calcium carbide method accounts for more than 70% of the total PVC output in the country. According to records, the amount of mercury used in the production of PVC by the calcium carbide method accounts for about 60% of the total mercury used in the country. The production of PVC by the calcium carbide method produces a lot of mercury-containing waste, mainly including waste mercury catalysts, mercury-containing sludge, waste mercury activated carbon, waste acid and waste alkali, which makes the PVC production industry a major mercury user and a key industry for mercury pollution control.

[0003] Mercury catalysts include activated carbon as a carrier and mercuric chloride as an active substance loaded on the surface of activated carbon. The mass fraction of mercuric chloride in mercury catalysts is usually 9.5%~12.0%. It is mainly used as a catalyst for the synthesis of vinyl chloride (VCM) from acetylene and hydrogen chloride gas in the production process of calcium carbide. After a certain period of use, the activity of mercury catalysts decreases and needs to be replaced. The mass fraction of mercuric chloride in the replaced waste mercury catalyst is about 1.5~3.0%, and the mass fraction of hydrogen chloride is about 1~2%. Its morphology is granular, and the surface of each particle is extremely rough, with many micropores and many fine white substances distributed. Mercury chloride is highly toxic, highly volatile, and easily soluble in water. At the same time, mercury itself is easy to migrate and highly bioaccumulate. If the replaced mercury catalyst is directly discarded or piled up, it will bring extremely serious mercury pollution and cause major safety hazards. Therefore, waste mercury catalysts will be sent to regenerated mercury enterprises for harmless treatment and recycling. At present, the main methods for harmless treatment of waste mercury catalysts are distillation, oxygen-controlled dry distillation, and chemical activation.

[0004] When treating waste mercury catalysts, during the overturning, transportation and screening of waste mercury catalysts, the particles will rub against each other, causing a part of the waste mercury catalysts to become powdery structures, becoming mercury-containing powders, which usually have a small energy diameter. There are two main problems in treating such mercury-containing powders using existing mercury recovery devices and methods for waste mercury catalysts: first, if the mercury-containing powders are directly heated in a traditional vertical recovery furnace, the dust in the mercury-containing powders will be sucked into the water absorption tower together with the sublimated mercuric chloride vapor under negative pressure, so that the mercuric chloride solution finally collected is turbid and cannot be used normally; second, the mercury-containing powders are easy to block the product channel in the vertical recovery furnace, affecting the normal and continuous operation of the recovery furnace.

[0005] Therefore, the existing mercury recovery devices and methods for waste mercury catalysts are unable to process powdered waste mercury catalysts and effectively recover mercury. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the disadvantages of the prior art and provide a mercury recovery device for waste mercury catalyst and a recovery method thereof, which can process powdered waste mercury catalyst and effectively recover mercury.

[0007] In order to solve the above technical problems, the present invention provides a mercury recovery device for waste mercury catalysts, which includes a mixing unit for mixing mercury-containing powder and a binder to obtain a mixed material, a granulation unit for pressing the mixed material into particles, and a heating unit for heating the particles to obtain mercuric chloride gas, which are arranged in sequence from left to right; a conveying unit for conveying the mixed material to the granulation unit is arranged between the mixing unit and the granulation unit, and the conveying unit includes a second discharge port, and a feeding pipe is installed at the second discharge port; the granulation unit includes a column, a tube body is rotatably sleeved outside the column, and a first large circular ring plate, a circular granulation plate, a first small circular ring plate, and a second small circular ring plate are fixedly sleeved outside the tube body from top to bottom in sequence; a plurality of hole groups are circumferentially arranged on the top of the granulation plate around its central axis, and the hole groups include A plurality of through holes are provided in a straight line on the granulation plate; an upper pressing piece and a lower pressing piece are slidably installed in each hole group and can be synchronously lifted and lowered to press the mixed material in the through hole into particles; a first scraper for pushing the mixed material on the granulation plate into the through hole and a second scraper for pushing the particles away from the lower pressing piece are fixedly installed on the tube body; the first scraper and the second scraper divide the surface of the granulation plate into a large sector area and a small sector area, the feed opening of the feeding pipe is located next to the small sector area, a first material guide for guiding the mixed material into the small sector area is arranged below the feed opening, and a second material guide for guiding the particles into the heating unit is arranged next to the side of the second scraper away from the first scraper; a fourth motor is installed at the bottom of the column, and the fourth motor is connected to the tube body through a third transmission member. Through the setting of the granulation unit, the mercury-containing powder is first made into particles and then heated, which greatly reduces the pollution of the mercury-containing powder to the heating unit and improves the purity of the recovered mercuric chloride.

[0008] As a further improvement of the present invention: the lower pressing member includes a group of lower pressing rods slidably installed in each through hole of the same hole group, and the bottom of the group of lower pressing rods is fixedly connected to the top of the lower cross-shaped plate; the bottom of the granulation plate is annularly provided with a plurality of first small grooves around its central axis, and the position of each first small groove corresponds to the position of a horizontal end of the lower cross-shaped plate, and the first small grooves are respectively connected to the top of the corresponding horizontal end through a first return spring, and two straight rods are vertically installed at the bottom of the lower cross-shaped plate, and a lower horizontal roller is rotatably installed between the two straight rods, and a lower annular track for sliding multiple lower horizontal rollers is fixedly installed outside the column; the upper pressing member includes a group of upper pressing rods slidably installed in each through hole of the same hole group, The top of a group of upper pressing rods are fixedly connected to the bottom of the upper cross-shaped plate, and the top of the first large circular ring plate is provided with a plurality of second small grooves around its central axis, and the position of each second small groove corresponds to the position of a horizontal end of the upper cross-shaped plate; the top of the horizontal end is vertically installed with a straight column, and the straight column passes through the bottom of the second small groove corresponding to it, and the top of the two straight columns located on the same upper cross-shaped plate is jointly installed with an upper horizontal roller through an elliptical plate, and the part of the straight column located between the second small groove and the elliptical plate is sleeved with a second return spring, and the top of the second return spring is fixedly connected to the bottom of the elliptical plate, and the bottom of the second return spring is fixedly connected to the top of the bottom of the second small groove; the top of the column is fixedly installed with an upper annular track. Through the cooperation of the upper pressing piece and the lower pressing piece, multiple particles can be extruded at one time, and continuous and uninterrupted pressing can be performed without waiting time, instead of pressing once and then lifting back to the original position for pressing again like a traditional pressing machine.

[0009] As a further improvement of the present invention: the first material guide member and the second material guide member are fixedly connected through an arc plate, the concave surface of the arc plate is fixedly connected to the first scraper and the second scraper at one end away from the tube body, the arc plate is fixedly mounted on the hollow annular frame, the bottom of the hollow annular frame is fixedly mounted with a hollow annular plate, the inner wall of the hollow annular plate is in contact with the lower annular track. The hollow annular frame and the hollow annular plate play a supporting role.

[0010] As a further improvement of the present invention: the mixing unit includes a mixing shell, the mixing shell includes a horizontal inner cylinder and a jacket arranged outside the horizontal inner cylinder, and a cavity for accommodating cooling circulating water is provided between the horizontal inner cylinder and the jacket; a first feed inlet is provided at the top of the mixing shell, a first discharge outlet is provided at the bottom of the mixing shell, and a discharge control valve is provided in the first discharge outlet; a stirring element is rotatably installed in the horizontal inner cylinder, and a first driving component for driving the stirring element to rotate is provided outside the horizontal inner cylinder, the first driving component includes a first motor, and the first motor is connected to the stirring element through a first transmission component.

[0011] As a further improvement of the present invention: the conveying unit includes an L-shaped tube, a second feed port is opened at the top of the short section of the L-shaped tube, and the second discharge port is located on the side of the long section of the L-shaped tube close to the granulation unit; a vertical screw conveyor is rotatably installed in the long section, and a second motor for driving the vertical screw conveyor to rotate is installed at the top of the long section; a horizontal screw conveyor is rotatably installed in the short section, and the right end of the horizontal screw conveyor is transmission-connected to the vertical screw conveyor via a second transmission member.

[0012] As a further improvement of the present invention: the heating unit includes a vertical tube with a top cover detachably installed at the opening at the top; a support plate and a second large circular plate are fixedly installed in the vertical tube from top to bottom, and a stirring blade for stirring the particles on the support plate is arranged on the support plate, and the blades of the stirring blade are all in a circular arc triangular plate structure; a third motor for driving the stirring blade to rotate is fixedly installed below the second large circular plate; a heating element for heating the support plate is arranged below the support plate; a third feed port is provided on the side of the vertical tube close to the conveying unit, and a door panel capable of lifting and lowering is arranged at the third feed port; a third discharge port is also provided on the vertical tube, and a material discharge inclined pipe is arranged outside the third discharge port; a waste residue outlet is also provided on the vertical tube, and a closed door is arranged at the waste residue outlet. In addition to stirring when heating particles, the heating unit can also realize automatic throwing out of waste residue when the stirring blade is reversed through the special shape of the stirring blade.

[0013] As a further improvement of the present invention, a condensing unit for condensing mercuric chloride gas to obtain mercuric chloride liquid is arranged in the vertical pipe. The condensing unit is integrated with the heating unit to save space occupied by the device.

[0014] As a further improvement of the present invention: the condensing unit includes a hollow tube fixedly installed on the vertical pipe, in which a hollow conical groove with an opening facing upward for placing coolant is fixedly installed; a small hollow conical groove is fixedly installed on the bottom of the hollow tube through a small bracket, the opening diameter of the small hollow conical groove is smaller than the opening diameter of the hollow conical groove, and the small bracket has a gap between the hollow conical groove and the small hollow conical groove for mercuric chloride gas to enter; an inclined tube that can extend from the third discharge port is installed at the bottom of the small hollow conical groove.

[0015] The present invention also provides a recovery method of the mercury recovery device for waste mercury catalyst, comprising the following steps: S1. Weigh 94-95 parts of mercury-containing powder and 4.9-5.3 parts of adhesive by mass, add them into a mixing unit, and mix them at 45-65° C. for 2.5-3 hours to obtain a mixed material; S2, the mixed material is transported from the conveying unit to the granulating unit and extruded into granules under a pressure of 8~10Mpa; S3, the particles enter the heating unit and are heated at 390~450℃ to obtain mercuric chloride gas. During heating, a flow of 20Nm2 from top to bottom is introduced into the heating unit. 3 / h of nitrogen.

[0016] As a further improvement of the present invention: the adhesive comprises the following components by mass: 80-85 parts of fly ash, 1.1-4.5 parts of sodium silicate, 5.5-6.9 parts of talc, and 3.0-3.5 parts of polyvinyl chloride polymerization mother liquid.

[0017] The beneficial effects of the present invention are as follows: the device and method provided by the present invention can process powdered waste mercury catalyst and effectively recover mercury. The device obtains a mixed material through a mixing unit, presses the mixed material into particles through a granulating unit, and then heats it with a heating unit. When the particles are heated, the mixed material will not have a large amount of dust mixed with the sublimated mercuric chloride vapor to be recovered, so that the finally collected mercuric chloride solution is turbid and cannot be used normally, but can generate almost no dust, greatly improving the purity of the recovered mercuric chloride solution. At the same time, there will be no large amount of powder blocking the product channel and affecting the normal and continuous operation of the heating unit. At the same time, a plurality of hole groups are arranged in an annular direction around the central axis of the top of the granulation plate in the granulation unit of the device, and the hole group includes a plurality of through holes which are linearly opened on the granulation plate; an upper pressing member and a lower pressing member which can be synchronously lifted and lowered are slidably installed in each hole group and are used to press the mixed material in the through hole into particles; through the rotation of the granulation plate and the cooperation with other components, continuous pressing of particles can be achieved without the need to lift back to the initial position after pressing once and then press the next time as in traditional pressing devices, which greatly improves the overall recovery efficiency of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 A top view of the present invention; Figure 3 It is a front view of the present invention; Figure 4 Schematic diagram of the overall structure of the mixing unit in the present invention; Figure 5 This is a schematic diagram of the overall structure of the mixing unit in the present invention without hiding the mixing shell; Figure 6 It is an assembly diagram of the mixing shell and the discharge control valve in the present invention; Figure 7 It is a schematic diagram of the overall structure of the discharge control valve in the present invention; Figure 8 It is an assembly diagram of the column, the tube body, the first large circular plate, the granulation plate, the first small circular plate, the second small circular plate and the connecting frame of the present invention; Fig. 9 It is an assembly diagram of the column, the tube body, the first large circular plate, the granulation plate, the first small circular plate, the second small circular plate, the connecting frame, the fourth motor and the third transmission member in the present invention; Fig.10 It is a schematic diagram of the overall structure of the first large circular ring plate in the present invention; Fig.11 It is a schematic diagram of the overall structure of the granulation plate in the present invention when viewed from above; Fig.12 It is an assembly diagram of a circular ring support frame and a small column in the present invention; Fig.13 It is a schematic diagram of the positional relationship of the pillar, the circular support frame, the roller, the ball, the small pillar and the connecting frame in the present invention; Fig.14 Schematic diagram of the positional relationship between the roller and the ball in the present invention; Fig.15 It is a schematic diagram of the positional relationship of the circular support frame, a plurality of small columns and rollers in the present invention; Fig.16 It is a schematic diagram of the positional relationship of the column, the tube body, the first large circular plate, the granulation plate, the first small circular plate, the second small circular plate, the circular support frame, the roller, the ball, the small column and the connecting frame in the present invention; Fig.17 It is a schematic diagram of the overall structure of the upper ring track in the present invention; Fig.18 It is a schematic diagram of the overall structure of the lower annular track in the present invention; Fig.19 It is a schematic diagram of the positional relationship among the upright column, the upper annular track, the upper pressed part, the small pressed part and the lower annular track in the present invention; Fig. 20 It is a schematic diagram of the positional relationship between the first large circular ring plate and an upper pressing member in the present invention; Fig.21 It is a schematic diagram of the positional relationship of some columns, the first small circular plate, the second small circular plate, the granulation plate and a plurality of lower pressing parts in the present invention; Fig. 22 It is a schematic diagram of the overall structure of the lower pressing part in the present invention; Fig.23 It is a schematic diagram of the overall structure of the granulation unit and part of the conveying unit in the present invention; Fig.24 It is an assembly diagram of the first scraper, the second scraper, the first material guide, the second material guide, the arc plate, the hollow annular frame and the hollow annular plate in the present invention; Fig.25It is an assembly diagram of the first scraper, the second scraper, the first material guide, the second material guide, the arc plate, the hollow annular frame, the hollow annular plate, the column and the granulation plate in the present invention; Fig.26 It is a schematic diagram of the overall structure of the heating unit in the present invention; Fig. 27 It is a partial structural schematic diagram of the heating unit and the condensing unit in the present invention; Fig.28 It is a schematic diagram of the overall structure of the hollow tube in the present invention; Fig.29 It is a side perspective view of the heating unit and the condensing unit in the present invention; Fig.30 It is a partial structural schematic diagram of the heating unit in the present invention; Fig.31 It is a schematic diagram of the overall structure of the condensing unit in the present invention; Fig.32 It is a partial structural schematic diagram of the condensing unit in the present invention; Fig.33 It is a schematic diagram of the overall structure of the conveying unit in the present invention; Fig.34 It is a perspective schematic diagram of the overall structure of the L-shaped tube and the feeding tube in the present invention; Fig.35 It is a schematic diagram of the overall structure of the conveying unit in the present invention from another angle; Fig.36 It is a partial structural schematic diagram of the conveying unit in the present invention; The names of the components corresponding to the marks in the above drawings are: 1, mixing unit; 101, mixing housing; 102, first feed port; 103, first discharge port; 104, discharge control valve; 105, stirring element; 106, first motor; 107, first transmission element; 2. Granulation unit; 201. Column; 202. Tube; 203. First large circular plate; 204. Granulation plate; 205. First small circular plate; 206. Second small circular plate; 207. Hole group; 208. First small groove; 209. Second small groove; 2010. Fourth motor; 2011. Third transmission member; 2012. Circular support frame; 2013. Roller; 2014. Ball; 2015. Small column; 2016. Connecting frame; 3. Heating unit; 301. Vertical pipe; 302. Support plate; 303. Second large circular plate; 304. Stirring blade; 305. Third motor; 306. Heating element; 307. Third feeding port; 308. Door panel; 309. Third discharging port; 3010. Closed door; 4. Conveying unit; 401. L-shaped tube; 402. second feed port; 403. second discharge port; 404. feeding tube; 405. vertical screw conveyor; 406. second motor; 407. horizontal screw conveyor; 408. second transmission member; 5. Condensation unit; 501. Hollow tube; 502. Hollow conical groove; 503. Small bracket; 504. Small hollow conical groove; 505. Oblique tube; 6. Lower pressing member; 601. Lower pressing rod; 602. Lower cross-shaped plate; 603. First return spring; 604. Straight rod; 605. Lower horizontal roller; 606. Lower annular track; 7. Upper pressing member; 701. Upper pressing rod; 702. Upper cross-shaped plate; 703. Straight column; 704. Upper horizontal roller; 705. Second return spring; 706. Upper annular track; 801, first scraper; 802, second scraper; 803, first material guide; 804, second material guide; 901. arc-shaped plate; 902. hollow annular frame; 903. hollow annular plate. DETAILED DESCRIPTION

[0019] The specific implementation modes of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0020] Definitions of relevant terms involved in this invention: (1) The directional words such as "up", "down", "left", "right", "front", "back", "top", "bottom" etc. mentioned in the present invention are all Figure 2 as well as Figure 3 The defined directions and the orientation marks in the figures are taken as reference.

[0021] (2) Production method of mercury catalyst: using activated carbon as carrier and mercuric chloride as active substance, the mercuric chloride is loaded on the surface of activated carbon.

[0022] like Figure 1 , Figure 2 , Figure 3 As shown, a mercury recovery device for waste mercury catalyst provided by the present invention includes, arranged from left to right, a mixing unit 1 for mixing mercury-containing powder with a binder to obtain a mixed material, a granulating unit 2 for pressing the mixed material into particles, and a heating unit 3 for heating the particles to obtain mercuric chloride gas.

[0023] like Figure 1 , Figure 4 , Figure 5 , Figure 6 , Figure 7As shown, the mixing unit 1 includes a mixing shell 101, four supporting columns are installed at the bottom of the mixing shell 101, the mixing shell 101 includes a horizontal inner cylinder and a jacket sleeved outside the horizontal inner cylinder, and a cavity for accommodating cooling circulating water is provided between the horizontal inner cylinder and the jacket; the central axis of the horizontal inner cylinder and the central axis of the stirring member 105 are located on the same horizontal line, a first feed port 102 for entering mercury-containing powder and adhesive is provided at the top of the mixing shell 101, a first discharge port 103 is provided at the bottom of the mixing shell 101, a discharge control valve 104 is provided in the first discharge port 103, the discharge control valve 104 includes a fifth motor and a valve plate installed on the output shaft of the fifth motor, when the valve plate is in a horizontal state, the first discharge port 103 is blocked by the first discharge port 103, and when the first discharge port 103 is not in a horizontal state The mixed material can fall from the first discharge port 103, and the inclination angle of the valve plate will affect the specific discharge amount. The first discharge port 103 is located above the second discharge port 403 and is connected to the second discharge port 403; a stirring member 105 is rotatably installed in the horizontal inner cylinder, and a first driving assembly for driving the stirring member 105 to rotate is arranged outside the horizontal inner cylinder, and the first driving assembly includes a first motor 106, and the stirring member 105 includes six C-shaped frames arranged circumferentially around the stirring shaft, and the openings of the six C-shaped frames are all facing the stirring shaft. The first motor 106 is connected to the stirring member 105 through a first transmission member 107, and the first transmission member 107 includes a first pinion fixedly mounted on the output shaft of the first motor 106 and a first large gear fixedly mounted on the end of the stirring shaft close to the first motor 106 and meshing with the first pinion.

[0024] like Figure 1 , Figure 8 , Fig. 9 , Fig.10 , Fig.11 , Fig.12 , Fig.13 , Fig.14 , Fig.15 , Fig.16 , Fig.17 , Fig.18 , Fig.19 , Fig. 20 , Fig.21 , Fig. 22As shown, the granulation unit 2 includes a column 201, and a tube body 202 is rotatably sleeved on the outside of the column 201, and a first large circular plate 203, a circular granulation plate 204, a first small circular plate 205, and a second small circular plate 206 are fixedly sleeved on the outside of the tube body 202 from top to bottom in sequence; a circular support frame 2012 is rotatably installed between the first small circular plate 205 and the second small circular plate 206, and the edge of the circular support frame 2012 has a plurality of protruding frames arranged circumferentially around its central axis, and the top of the protruding frame contacts the bottom of the hollow annular plate 903, which can play a certain supporting role. A small column 2015 is plugged into the bottom of the protruding frame, and a plug-in hole matching the shape and size of the small column 2015 is provided at the bottom of the protruding frame, and a plurality of connecting frames 2016 for respectively fixing and installing the small columns 2015 are fixedly installed circumferentially around its central axis on the bottom of the column 201. Annular grooves are provided at the top and bottom of the annular support frame 2012, and multiple balls 2014 are arranged in the annular grooves. When the tube body 202 drives the first small annular plate 205 and the second small annular plate 206 to rotate, the multiple balls 2014 can rotate between the first small annular plate 205 and the top of the annular support frame 2012 or the second small annular plate 206 and the bottom of the annular support frame 2012. A plurality of vertical rollers 2013 are arranged in a circumferential direction around the center of the circular hole in the center of the annular support frame 2012, and the rollers 2013 are in contact with the wall of the circular hole and the outer wall of the tube body 202. The tube body 202 can be smoothly rotated in the annular support frame 2012 by roller 2013 and ball bearing 2014, and the annular support frame 2012 can support the tube body 202 at this height by the first small annular plate 205 and the second small annular plate 206, so that it does not shift in the up and down direction and can only rotate around the column 201. The bottom of the column 201 is equipped with the fourth motor 2010 and a motor protection frame for protecting the fourth motor 2010, and the output shaft of the fourth motor 2010 faces upward and passes through the top of the motor protection frame. The fourth motor 2010 is connected to the tube body 202 through the third transmission member 2011, and the third transmission member 2011 includes a gear ring fixedly sleeved outside the second small annular plate 206 and a second pinion gear fixedly mounted on the output shaft of the fourth motor 2010 and meshed with the gear ring, and the second pinion gear is located above the top of the motor protection frame.The top of the granulation plate 204 is provided with a plurality of hole groups 207 in an annular direction around its central axis, and the hole group 207 includes a plurality of through holes which are linearly opened on the granulation plate 204; an upper pressing member 7 and a lower pressing member 6 which can be synchronously lifted and lowered and are used to press the mixed material in the through hole into particles are slidably installed in each hole group 207, and the upper pressing member 7 is located above the lower pressing member 6; the lower pressing member 6 includes a group of lower pressing rods 601 which are slidably installed in each through hole of the same hole group 207, and the bottom of each group of lower pressing rods 601 is fixedly connected to the top of the lower cross-shaped plate 602 The bottom of the granulation plate 204 is provided with a plurality of first small grooves 208 in an annular direction around its central axis, and the position of each first small groove 208 corresponds to the position of a horizontal end of the lower cross-shaped plate 602, and the first small grooves 208 are connected to the top of the corresponding horizontal end through the first return spring 603, and two straight rods 604 are vertically installed at the bottom of the lower cross-shaped plate 602, and a lower horizontal roller 605 is rotatably installed between the two straight rods 604, and a lower annular track 606 for sliding multiple lower horizontal rollers 605 is fixedly installed outside the column 201, through the lower The sliding of the horizontal roller 605 on the top of the lower annular track 606 can realize the up and down sliding of the lower pressing rod 601; the upper pressing member 7 includes a group of upper pressing rods 701 slidably installed in each through hole of the same hole group 207, and the top of a group of upper pressing rods 701 is fixedly connected to the bottom of the upper cross-shaped plate 702. The top of the first large circular ring plate 203 is circumferentially provided with a plurality of second small grooves 209 around its central axis, and the position of each second small groove 209 corresponds to the position of a horizontal end of the upper cross-shaped plate 702; the top of each horizontal end is vertically installed with a straight column 703, the straight column 703 passes through the bottom of the second small groove 209 corresponding to it, and the tops of the two straight columns 703 located on the same upper cross-shaped plate 702 are jointly installed with an upper horizontal roller 704 through an elliptical plate, and the portion of the straight column 703 located between the second small groove 209 and the elliptical plate is sleeved with a second return spring 705, the top of the second return spring 705 is fixedly connected to the bottom of the elliptical plate, and the bottom of the second return spring 705 is fixedly connected to the top of the bottom of the second small groove 209; the top of the column 201 is fixedly installed with an upper annular track 706. The upper pressing rod 701 can slide up and down by the sliding of the upper horizontal roller 704 at the bottom of the upper annular track 706; the lower cross-shaped plate 602 and the upper cross-shaped plate 702 each include two vertical ends and two horizontal ends, the central axes of the lower horizontal roller 605 and the upper horizontal roller 704 are both perpendicular to the central axis of the column 201, the top of the lower annular track 606 and the bottom of the upper annular track 706 both present a curved surface structure including a convex section and a smooth section, the smooth section of the lower annular track 606 corresponds to the position of the convex section of the upper annular track 706, and the convex section of the lower annular track 606 corresponds to the position of the smooth section of the upper annular track 706; the highest point of the convex section of the lower annular track 606 is located on the right side of the second scraper 802. like Fig.23 , Fig.24 , Fig.25 As shown, a first scraper 801 for pushing the mixed material on the granulation plate 204 into the through hole and a second scraper 802 for pushing the particles off the lower pressing member 6 are fixedly installed on the tube body 202; the first scraper 801 and the second scraper 802 divide the surface of the granulation plate 204 into a large sector area and a small sector area, the discharge port of the feeding tube 404 is located next to the small sector area, and a first material guide 803 for guiding the mixed material into the small sector area is arranged below the discharge port. A second material guide member 804 for guiding particles into the heating unit 3 is arranged on the side of the second scraper 802 away from the first scraper 801. The first material guide member 803 and the second material guide member 804 both include an inclined bottom plate and a surrounding wall arranged around the inclined bottom plate; the first material guide member 803 and the second material guide member 804 are fixedly connected via an arc plate 901, the concave surface of the arc plate 901 is fixedly connected to one end of the first scraper 801 and the second scraper 802 away from the tube body 202, the arc plate 901 is fixedly installed on the hollow annular frame 902, and a hollow annular plate 903 is fixedly installed on the bottom of the hollow annular frame 902, and the inner wall of the hollow annular plate 903 abuts against the lower annular track 606.

[0025] like Figure 1 , Fig.26 , Fig. 27 , Fig.28 , Fig.29 , Fig.30 As shown, the heating unit 3 includes a vertical pipe 301 with a top cover detachably mounted at the top opening; a copper support plate 302 for placing particles and a second large circular plate 303 are fixedly mounted in the vertical pipe 301 from top to bottom, and a stirring blade 304 for stirring the particles on the support plate 302 is arranged on the support plate 302, and the blades of the stirring blade 304 are all in an arc-shaped triangular plate structure; a third motor 3 is fixedly mounted below the second large circular plate 303 for driving the stirring blade 304 to rotate 05; A heating element 306 for heating the support plate 302 is provided below the support plate 302, and the heating element 306 is a heating plate; a third feed port 307 is provided on the side of the vertical pipe 301 close to the conveying unit 4, and a door panel 308 capable of lifting and lowering is provided at the third feed port 307; a third discharge port 309 is also provided on the vertical pipe 301, and a material discharge inclined pipe is provided outside the third discharge port 309; a waste residue outlet is also provided on the vertical pipe 301, and a closed door 3010 is provided at the waste residue outlet. The support plate 302 and the second large annular plate 303 are located at the lower side of the vertical pipe 301.

[0026] like Figure 1 , Fig.33 , Fig.34 , Fig.35 , Fig.36As shown, a conveying unit 4 for conveying the mixed material to the granulating unit 2 is arranged between the mixing unit 1 and the granulating unit 2, and the conveying unit 4 includes a second discharge port 403, and an L-shaped feeding pipe 404 is installed at the second discharge port 403; the conveying unit 4 includes an L-shaped tube 401, and a second feed port 402 is opened on the top of the short section of the L-shaped tube 401, and the second discharge port 403 is located on the side of the long section of the L-shaped tube 401 close to the granulating unit 2; a vertical spiral conveyor is rotatably installed in the long section. The conveying member 405 has a second motor 406 installed on the top of the long section for driving the vertical screw conveying member 405 to rotate; a horizontal screw conveying member 407 is installed in the short section for rotation, and the right end of the horizontal screw conveying member 407 is connected to the vertical screw conveying member 405 through a second transmission member 408. A hole is provided at the turning point of the L-shaped tube 401, and an L-shaped partition is provided in the hole. The second transmission member 408 is located outside the L-shaped partition to prevent the second transmission member 408 from being affected by the mixed material. The second transmission member 408 includes a second bevel gear fixedly installed at the right end of the horizontal screw conveying member 407 and a first bevel gear fixedly installed at the bottom end of the vertical screw conveying member 405 and meshing with the second bevel gear.

[0027] like Fig. 27 , Fig.29 , Fig.31 , Fig.32 As shown, a condensation unit 5 for condensing mercuric chloride gas to obtain mercuric chloride liquid is provided in the standpipe 301. The condensation unit 5 is located on the upper side of the standpipe 301, and the condensation unit 5 comprises a hollow tube 501 fixedly installed on the standpipe 301, and a hollow conical groove 502 with an upward opening for placing coolant is fixedly installed in the hollow tube 501; the outer wall of the hollow tube 501 is in close contact with the inner wall of the standpipe 301; a small hollow conical groove 504 is fixedly installed at the bottom of the hollow tube 501 through a small bracket 503, and the opening diameter of the small hollow conical groove 504 is smaller than the opening diameter of the hollow conical groove 502, and the small bracket 503 has a gap between the hollow conical groove 502 and the small hollow conical groove 504 for mercuric chloride gas to enter; an inclined tube 505 that can extend from the third discharge port 309 is installed at the bottom of the small hollow conical groove 504. The surfaces of the small bracket 503 and the small hollow conical groove 504 are sprayed with high temperature resistant heat insulation paint.

[0028] The working principle of the device provided by the present invention is as follows: the fifth motor remains stationary, so that the valve plate of the discharge control valve 104 is in a horizontal state, the first discharge port 103 is kept closed, and the mercury-containing powder and the adhesive are added into the horizontal inner cylinder from the first feed port 102. After the addition is completed, the first motor 106 is started to drive the first small gear to rotate, and the first small gear drives the rotating shaft of the stirring member 105 to rotate through the first large gear. When the stirring member 105 rotates, the mercury-containing powder and the adhesive are mixed evenly. During the stirring process, cooling circulating water is introduced into the cavity to ensure that the mixing temperature is within the range of 45 to 65° C. After the mixing is evenly performed to obtain a mixed material, the fifth motor is started to drive the valve plate of the discharge control valve 104 to rotate to a vertical state, the first discharge port 103 is opened, and the mixed material falls from the first discharge port 103 with a maximum discharge amount.

[0029] The second motor 406 is started, driving the rotating shaft of the vertical spiral conveyor 405 to rotate, thereby rotating the vertical spiral conveyor blades. The rotating shaft of the vertical spiral conveyor 405 drives the second bevel gear to rotate through the first bevel gear. The second bevel gear drives the rotating shaft of the horizontal spiral conveyor 407 to rotate, thereby rotating the horizontal spiral conveyor blades. After the mixed material falls into the short section of the L-shaped tube 401 from the second feed port 402, it will be transported from left to right under the rotation of the horizontal spiral conveyor blades, and when it reaches the long section of the L-shaped tube 401, it will be transported from bottom to top driven by the vertical spiral conveyor blades, and arrive at the second discharge port 403 and fall from the second discharge port 403.

[0030] The fourth motor 2010 is started, driving the second pinion to rotate, and the second pinion drives the second small annular plate 206 to rotate through the second large gear, thereby driving the entire tube body 202 to rotate. As the tube body 202 rotates, the first large annular plate 203 and the granulation plate 204 begin to rotate synchronously. The mixed material falls onto the first material guide 803 and then enters the small sector area. As the granulation plate 204 rotates, the mixed material will be pushed into the through holes of each hole group 207 by the first scraper 801 when passing through the first scraper 801. The granulating plate 204 drives the lower pressing member 6 to rotate. The lower pressing rod 601 with the mixed material placed on the top is originally in the lowest position. Then, the lower horizontal roller 605 slides on the smooth section of the lower annular track 606, and the lower pressing rod 601 will continue to be in the lowest position. The upper pressing rod 701 is originally in the highest position, located outside the through hole with the mixed material. As the upper horizontal roller 704 slides from the smooth section to the convex section at the bottom of the upper annular track 706, the upper pressing rod 701 gradually descends and extends into the through hole, contacting with the top of the lower pressing rod 601. The mixed materials come into contact with each other, and are pressed into particles through the joint action of the upper pressing rod 701 and the lower pressing rod 601. After the pressing is completed, the upper horizontal roller 704 slides from the flat convex section to the sliding section at the bottom of the upper annular track 706, gradually rises, and leaves the through hole. The lower horizontal roller 605 slides from the smooth section to the convex section at the top of the lower annular track 606, and the lower pressing rod 601 gradually rises to push the particles out of the through hole. At this time, the pushed out particles will be pushed away from the top of the lower pressing rod 601 by the second scraper and reach the second material guide 804.

[0031] Open the top cover and add coolant into the hollow conical groove 502, then close the top cover. The first telescopic member shortens, driving the door panel 308 to rise, and the particles in the second material guide member 804 enter the vertical pipe 301 from the third feed port 307, and fall onto the support plate 302. The heating member 306 starts to heat, and the third motor 305 starts, driving the stirring blade 304 to rotate in the direction of the concave surface of the blade, stirring the particles so that they can be heated evenly. When the particles are heated to 302°C, mercuric chloride gas gradually appears, and the mercuric chloride gas moves upward from the gap of the small bracket 503 into the space between the hollow conical groove 502 and the small hollow conical groove 504. The mercuric chloride gas condenses into liquid after contacting the outer wall of the hollow conical groove 502, and then flows along the hollow cone. The conical tip of the conical groove 502 flows down and flows into the small hollow conical groove 504, and then flows into the third discharge port 309 along the inclined tube 505, and then flows into the discharge inclined tube from the third discharge port 309. The mercuric chloride liquid can be collected at the discharge port of the discharge inclined tube. After heating is completed, the knob is loosened and pulled out of the driving rod, and then the driving rod is pulled to slide upward, driving the closed door 3010 to open upward, and a collection box is set at the waste residue outlet. Then the knob is tightened to make it abut against the driving rod, and the third motor 305 is reversed to drive the stirring blade 304 to rotate in the direction of the convex surface of the blade, and the residue is thrown into the collection box from the waste residue outlet under the action of centrifugal force. At this point, the recovery of mercury-containing powder is completed.

[0032] The method provided by the present invention comprises the following steps: S1. Weigh 94-95 parts of mercury-containing powder and 4.9-5.3 parts of binder by mass, add them into the mixing unit 1, mix them at 45-65° C. for 2.5-3 hours to obtain a mixed material, and rotate the stirring element 105 at 10-20 r / min during mixing; the binder includes the following components by mass: 80-85 parts of fly ash, 1.1-4.5 parts of sodium silicate, 5.5-6.9 parts of talc, and 3.0-3.5 parts of polyvinyl chloride polymerization mother liquor.

[0033] S2, the mixed material is transported to the granulation unit 2 by the conveying unit 4, and is extruded into granules with a diameter of 5.0 mm and a height of 10-15 mm under a pressure of 8-10 MPa; S3, the particles enter the heating unit 3, and are heated at 390-450°C to obtain mercuric chloride gas. During heating, a gas flowing from top to bottom at a flow rate of 20 Nm is introduced into the heating unit 3. 3 / h of nitrogen.

[0034] [Example 1] S1. Weigh 94 parts of mercury-containing powder and 4.9 parts of adhesive, add them into the mixing unit 1, mix them at 45° C. for 3 hours to obtain a mixed material, and the rotation speed of the stirring element 105 during mixing is 20 r / min; the adhesive includes the following components by mass: 80 parts of fly ash, 1.1 parts of sodium silicate, 5.5 parts of talc, and 3.0 parts of polyvinyl chloride polymerization mother liquor.

[0035] S2, the mixed material is transported to the granulation unit 2 by the conveying unit 4, and is extruded into granules with a diameter of 5.0 mm and a height of 10 mm under a pressure of 8 MPa; S3, the particles enter the heating unit 3, and are heated at 390°C to obtain mercuric chloride gas. During heating, a gas flowing from top to bottom at a flow rate of 20 Nm is introduced into the heating unit 3. 3 / h of nitrogen.

[0036] [Example 2] S1. Weigh 94.5 parts of mercury-containing powder and 5.3 parts of binder, add them into the mixing unit 1, mix them at 455° C. for 2.75 hours to obtain a mixed material, and the rotation speed of the stirring element 105 during mixing is 15 r / min; the binder includes the following components by mass: 82.5 parts of fly ash, 2.8 parts of sodium silicate, 6.2 parts of talc, and 3.25 parts of polyvinyl chloride polymerization mother liquor.

[0037] S2, the mixed material is transported to the granulation unit 2 by the conveying unit 4, and is extruded into granules with a diameter of 5.0 mm and a height of 12.5 mm under a pressure of 9 MPa; S3, the particles enter the heating unit 3, and are heated at 420°C to obtain mercuric chloride gas. During heating, a flow of 20 Nm2 from top to bottom is introduced into the heating unit 3. 3 / h of nitrogen; mercuric chloride gas enters the condensation unit 5 upward and is condensed into mercuric chloride liquid, which flows out from the feed inclined tube, collects the outflowing mercuric chloride liquid, and opens the heating unit 3 to collect the mercury-free particles after mercury removal.

[0038] [Example 3] S1. Weigh 95 parts of mercury-containing powder and 5.1 parts of adhesive by mass, add them into the mixing unit 1, mix them at 65° C. for 2.5 hours to obtain a mixed material, and the rotation speed of the stirring element 105 during mixing is 10 r / min; the adhesive includes the following components by mass: 85 parts of fly ash, 4.5 parts of sodium silicate, 6.9 parts of talc, and 3.5 parts of polyvinyl chloride polymerization mother liquor.

[0039] S2, the mixed material is transported to the granulation unit 2 by the conveying unit 4, and is extruded into granules with a diameter of 5.0 mm and a height of 15 mm under a pressure of 10 MPa; S3, the particles enter the heating unit 3, and are heated at 450°C to obtain mercuric chloride gas. During heating, a flow of 20 Nm2 from top to bottom is introduced into the heating unit 3. 3 / h of nitrogen; mercuric chloride gas enters the condensation unit 5 upward and is condensed into mercuric chloride liquid, which flows out from the feed inclined tube, collects the outflowing mercuric chloride liquid, and opens the heating unit 3 to collect the mercury-free particles after mercury removal.

[0040] It should be noted that the present invention is not limited to the specific structures shown in the drawings in the above-mentioned embodiments, and various changes can be made thereto within the knowledge scope of ordinary technicians in this field.

Claims

1. A mercury recovery device for waste mercury catalyst, characterized in that: The invention comprises a mixing unit (1) for mixing mercury-containing powder and a binder to obtain a mixed material, a granulation unit (2) for pressing the mixed material into granules, and a heating unit (3) for heating the granules to obtain mercuric chloride gas, which are arranged in sequence from left to right; a conveying unit (4) for conveying the mixed material to the granulation unit (2) is arranged between the mixing unit (1) and the granulation unit (2); the conveying unit (4) comprises a second discharge port (403); a feeding pipe (404) is installed at the second discharge port (403); The granulation unit (2) comprises a column (201), a tube body (202) is rotatably sleeved on the outside of the column (201), and a first large circular plate (203), a circular granulation plate (204), a first small circular plate (205), and a second small circular plate (206) are fixedly sleeved on the outside of the tube body (202) in order from top to bottom; A plurality of hole groups (207) are arranged in an annular direction around the central axis of the granulation plate (204) at the top thereof, and the hole groups (207) include a plurality of through holes which are linearly opened on the granulation plate (204); an upper pressing member (7) and a lower pressing member (6) which can be synchronously lifted and lowered and are used to press the mixed material in the through holes into particles are slidably mounted in each of the hole groups (207); A first scraper (801) for pushing the mixed material on the granulation plate (204) into the through hole and a second scraper (802) for pushing the particles away from the lower pressing member (6) are fixedly mounted on the tube body (202); the first scraper (801) and the second scraper (802) divide the surface of the granulation plate (204) into a large sector area and a small sector area, the feed opening of the feed tube (404) is located next to the small sector area, a first material guide (803) for guiding the mixed material into the small sector area is arranged below the feed opening, and a second material guide (804) for guiding the particles into the heating unit (3) is arranged next to a side of the second scraper (802) away from the first scraper (801); A fourth motor (2010) is installed at the bottom of the column (201), and the fourth motor (2010) is transmission-connected to the tube body (202) via a third transmission member (2011).

2. A mercury recovery device for waste mercury catalyst according to claim 1, characterized in that: The lower pressing member (6) comprises a group of lower pressing rods (601) slidably mounted in each through hole of the same hole group (207), and the bottom of each group of the lower pressing rods (601) is fixedly connected to the top of the lower cross-shaped plate (602); the bottom of the granulating plate (204) is provided with a plurality of first small grooves (208) in an annular direction around the central axis thereof, and the position of each first small groove (208) corresponds to the position of a horizontal end of the lower cross-shaped plate (602), and the first small grooves (208) are respectively connected to the top of the corresponding horizontal end via a first return spring (603); two straight rods (604) are vertically mounted on the bottom of the lower cross-shaped plate (602), and a lower horizontal roller (605) is rotatably mounted between the two straight rods (604); and a lower annular track (606) for sliding the plurality of lower horizontal rollers (605) is fixedly mounted outside the column (201); The upper pressing member (7) comprises a group of upper pressing rods (701) slidably mounted in each through hole of the same hole group (207); the top of the group of upper pressing rods (701) are fixedly connected to the bottom of the upper cross-shaped plate (702); the top of the first large circular plate (203) is provided with a plurality of second small grooves (209) in a circumferential direction around its central axis; the position of each second small groove (209) corresponds to the position of a horizontal end of the upper cross-shaped plate (702); the top of each horizontal end is vertically mounted with a straight column (703), and the straight column (703) passes through the corresponding second small groove (209). The bottom of the groove (209) and the tops of the two straight columns (703) located on the same upper cross-shaped plate (702) are jointly equipped with an upper horizontal roller (704) through an elliptical plate; the portion of the straight column (703) located between the second small groove (209) and the elliptical plate is sleeved with a second return spring (705); the top of the second return spring (705) is fixedly connected to the bottom of the elliptical plate; the bottom of the second return spring (705) is fixedly connected to the top of the bottom of the second small groove (209); and an upper annular track (706) is fixedly installed on the top of the column (201).

3. A mercury recovery device for waste mercury catalyst according to claim 2, characterized in that: The first material guide member (803) and the second material guide member (804) are fixedly connected via an arc-shaped plate (901); the concave surface of the arc-shaped plate (901) is fixedly connected to one end of the first scraper (801) and the second scraper (802) away from the tube body (202); the arc-shaped plate (901) is fixedly mounted on a hollow annular frame (902); a hollow annular plate (903) is fixedly mounted on the bottom of the hollow annular frame (902); and the inner wall of the hollow annular plate (903) is in contact with the lower annular track (606).

4. A mercury recovery device for waste mercury catalyst according to any one of claims 1 to 3, characterized in that: The mixing unit (1) comprises a mixing shell (101), the mixing shell (101) comprising a horizontal inner cylinder and a jacket sleeved outside the horizontal inner cylinder, a cavity for containing cooling circulating water is provided between the horizontal inner cylinder and the jacket; a first feed port (102) is provided at the top of the mixing shell (101), a first discharge port (103) is provided at the bottom of the mixing shell (101), and a discharge control valve (104) is provided in the first discharge port (103); A stirring member (105) is rotatably mounted in the horizontal inner cylinder, and a first driving assembly for driving the stirring member (105) to rotate is arranged outside the horizontal inner cylinder. The first driving assembly comprises a first motor (106), and the first motor (106) is connected to the stirring member (105) via a first transmission member (107).

5. A mercury recovery device for waste mercury catalyst according to any one of claims 1 to 3, characterized in that: The conveying unit (4) comprises an L-shaped tube (401), a second feed port (402) is provided at the top of a short section of the L-shaped tube (401), and the second discharge port (403) is located on a side of a long section of the L-shaped tube (401) close to the granulation unit (2); A vertical screw conveyor (405) is rotatably mounted in the long section, and a second motor (406) for driving the vertical screw conveyor (405) to rotate is mounted on the top of the long section; a horizontal screw conveyor (407) is rotatably mounted in the short section, and the right end of the horizontal screw conveyor (407) is transmission-connected to the vertical screw conveyor (405) via a second transmission member (408).

6. A mercury recovery device for waste mercury catalyst according to any one of claims 1 to 3, characterized in that: The heating unit (3) comprises a vertical pipe (301) with a top cover detachably mounted at the top opening; A support plate (302) and a second large circular plate (303) are fixedly installed in the vertical pipe (301) from top to bottom; a stirring blade (304) for stirring particles on the support plate (302) is arranged on the support plate (302); the blades of the stirring blade (304) are all in an arc-shaped triangular plate structure; a third motor (305) for driving the stirring blade (304) to rotate is fixedly installed below the second large circular plate (303); a heating element (306) for heating the support plate (302) is arranged below the support plate (302); A third material inlet (307) is provided on a side of the vertical pipe (301) close to the conveying unit (4), and a door panel (308) capable of being raised and lowered is provided at the third material inlet (307); a third material outlet (309) is also provided on the vertical pipe (301), and a material discharge inclined pipe is provided outside the third material outlet (309); a waste residue outlet is also provided on the vertical pipe (301), and a closed door (3010) is provided at the waste residue outlet.

7. A mercury recovery device for waste mercury catalyst according to claim 6, characterized in that: The riser (301) is provided with a condensation unit (5) for condensing mercuric chloride gas to obtain mercuric chloride liquid.

8. A mercury recovery device for waste mercury catalyst according to claim 7, characterized in that: The condensing unit (5) comprises a hollow tube (501) fixedly mounted on the vertical pipe (301), wherein a hollow conical groove (502) with an opening facing upward and used for placing cooling liquid is fixedly mounted in the hollow tube (501); A small hollow conical groove (504) is fixedly mounted on the bottom of the hollow tube (501) via a small bracket (503); the opening diameter of the small hollow conical groove (504) is smaller than the opening diameter of the hollow conical groove (502); and the small bracket (503) has a gap between the small hollow conical groove (504) and the small hollow conical groove (504) for mercuric chloride gas to enter; An inclined tube (505) capable of extending from the third discharge port (309) is installed at the bottom of the small hollow conical groove (504).

9. A method for recycling mercury from a waste mercury catalyst according to claim 1, characterized in that: The following steps are involved: S1. Weigh 94-95 parts of mercury-containing powder and 4.9-5.3 parts of binder by mass, add them to the mixing unit (1), and mix them at 45-65° C. for 2.5-3 hours to obtain a mixed material; S2, the mixed material is transported by the conveying unit (4) to the granulation unit (2), and is extruded into granules at a pressure of 8-10 MPa; S3, the particles enter the heating unit (3), and are heated at 390-450°C to obtain mercuric chloride gas. During heating, a gas flowing from top to bottom at a flow rate of 20 Nm is introduced into the heating unit (3). 3 / h of nitrogen.

10. The method for recovering mercury from a waste mercury catalyst according to claim 9, characterized in that: The adhesive comprises the following components by weight: 80-85 parts of fly ash, 1.1-4.5 parts of sodium silicate, 5.5-6.9 parts of talc, and 3.0-3.5 parts of polyvinyl chloride polymerization mother liquid.

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