A pickling sludge pretreatment device

Abstract

This invention discloses a pretreatment device for pickling sludge, comprising a drying mechanism, a batching mechanism, and a rotary kiln. The batching mechanism includes an outer cylinder, an inner cylinder, an upper sealer, a weighing cylinder, a lower sealer, and a powder metering feeder. The outer cylinder is open at both ends, and the inner cylinder is shaped like a flared mouth with a larger upper opening and a smaller lower opening. The inner cylinder is fixed inside the outer cylinder, and the upper sealer seals the lower opening of the inner cylinder. The weighing cylinder is placed inside the outer cylinder and located below the inner cylinder, and the lower sealer seals the lower opening of the weighing cylinder. The outer cylinder has a feeding port, and the powder metering feeder is connected to the feeding port. This pretreatment device for pickling sludge utilizes the drying mechanism to pre-dry the pickling sludge and the batching mechanism to achieve automated weighing and batching of the pickling sludge, efficiently treating the pickling sludge into slag suitable for metal smelting, significantly improving the treatment efficiency of the pickling sludge.

Description

Technical Field

[0001] This invention relates to the field of metallurgical equipment, and more particularly to a pretreatment device for pickling sludge. Background Technology

[0002] Pickling sludge is a waste product generated during the production of stainless steel and other metal products. It contains approximately 10% valuable metals such as Fe, Ni, and Cr, as well as CaF₂, CaO, SiO₂, sulfates, nitrates, and acidic substances. Pickling sludge is classified as hazardous solid waste; if not properly treated, the Cr content in the sludge can deteriorate. +6 Various heavy metals can cause enormous harm to the environment.

[0003] Metals in pickling sludge have significant recycling value. If these metals are processed into alloy ingots through metal smelting, not only can rare metals be recovered, but the pollution problem caused by pickling sludge can also be solved. However, many metals in pickling sludge exist in ionic form and contain a large amount of pickling impurities. Therefore, to smelt the metals in pickling sludge, the sludge must be pretreated to convert metal ions or compounds into metals or metal oxides. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a pretreatment device for pickling sludge, which can perform automated and efficient pretreatment of stainless steel pickling sludge and convert the pickling sludge into sand that can be used to smelt metals.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an acid washing sludge pretreatment device, including a drying mechanism, a batching mechanism and a rotary kiln;

[0006] The drying mechanism is used for the preliminary drying of pickling sludge. Various drying equipment in the prior art can be used for drying pickling sludge, such as steam dryers. The preliminary drying can remove more than 70% of the moisture from the pickling sludge.

[0007] The feeding mechanism includes an outer cylinder, an inner cylinder, an upper sealer, a weighing cylinder, a lower sealer, and a powder metering feeder. The outer cylinder is open at both ends, and the inner cylinder is shaped like a flared mouth with a larger upper opening and a smaller lower opening. The inner cylinder is fixed inside the outer cylinder, and the upper sealer seals the lower opening of the inner cylinder. The weighing cylinder is placed inside the outer cylinder and below the inner cylinder. The weighing cylinder can weigh itself and can also weigh the material after it has been loaded into it. The weighing cylinder is shaped like a flared mouth with a larger upper opening and a smaller lower opening, and the lower sealer seals the lower opening of the weighing cylinder. The outer cylinder has a feeding port, and the powder metering feeder is connected to the feeding port. The powder metering feeder stores reducing material for reducing pickling sludge. The powder metering feeder adds a fixed amount of reducing material to the weighing cylinder according to the weight of the weighing cylinder. Various commercially available powder metering feeders can be used in this invention, such as screw-type powder metering feeders.

[0008] The upper opening of the outer cylinder is aligned with the discharge port of the drying mechanism, and the lower opening of the outer cylinder is aligned with the feed port of the rotary kiln. After the batching mechanism completes the batching, it feeds the reducing material and the preliminarily dried pickling sludge into the rotary kiln for reduction treatment. After the reduction treatment is completed, a mixture containing metal and metal oxides can be obtained from the discharge port of the rotary kiln, which is usually called slag. Slag is used for subsequent metal smelting.

[0009] Specifically, the lower sealing device includes a sealing cone and a linear actuator. The telescopic rod of the linear actuator is connected to the sealing cone. The linear actuator lifts the sealing cone so that the sealing cone seals the lower opening of the weighing cylinder. A limiting ring is provided on the inner wall of the outer cylinder. The upper opening of the weighing cylinder rests on the limiting ring, and the weighing cylinder can move up and down inside the outer cylinder. The limiting ring is used to limit the lowest position of the weighing cylinder when it descends. When the weighing cylinder descends to the lowest position, if the linear actuator drives the sealing cone to continue descending, the sealing cone separates from the weighing cylinder, and the lower opening of the weighing cylinder opens.

[0010] Furthermore, a pressure sensor is provided between the telescopic rod of the linear actuator and the sealing cone. The pressure sensor is used to measure the total weight of the sealing cone, the weighing cylinder, and the material inside the weighing cylinder. The weights of the sealing cone and the weighing cylinder are known fixed values. Therefore, the weight of the material inside the weighing cylinder can be indirectly obtained through the measurement data of the pressure sensor.

[0011] Pickling sludge is a mud-like substance. After being dried by the drying mechanism, the pickling sludge becomes lumpy. This lumpy dried sludge is not conducive to the subsequent reduction reaction. To solve this problem, the batching mechanism in this invention also includes a stirring shaft, which is vertically inserted into the outer cylinder. A horizontal sieve plate is provided inside the outer cylinder, located above the inner cylinder, and multiple crushing balls are placed on the sieve plate. A horizontal first stirring rod is provided on the stirring shaft, located above the sieve plate.

[0012] After the lumpy pickling sludge falls into the outer cylinder, it will first stay on the screen plate. At this time, the rotating stirring shaft and the first stirring rod drive the crushing ball to continuously crush the pickling sludge on the screen plate, so that the pickling sludge becomes a powdery substance and then falls through the screen holes of the screen plate. The powdery pickling sludge is beneficial to the subsequent reduction reaction.

[0013] Furthermore, a horizontal second stirring rod is also provided on the stirring shaft. The second stirring rod is located between the inner cylinder and the weighing cylinder. The second stirring rod is used to stir the reducing material and the pickling sludge, so that the two are mixed more evenly.

[0014] The height of the second stirring rod should be set reasonably to ensure that the second stirring rod is above the material when the weighing cylinder is full of material, so as to avoid the second stirring rod affecting the weighing of the material. When it is necessary to stir the material, the linear drive drives the weighing cylinder to move upward until the second stirring rod is inserted into the material, and then the second stirring rod rotates to stir the material.

[0015] Furthermore, the weighing cylinder is provided with a vertically downward guide rod at the upper eaves, and a vertical guide hole is provided inside the limiting ring, into which the guide rod is inserted; the guide rod is used to limit the weighing cylinder to move only up and down and not rotate on its own; to prevent the weighing cylinder from rotating along with the second stirring rod when it is performing the rotating stirring operation.

[0016] Specifically, the upper sealing device includes a sealing body, a circular plate, and a lever. The sealing body includes a circular tube and a conical part located at the bottom of the circular tube. Two parallel circular plates are fixed to the circular tube of the sealing body. The lever is hinged to the wall of the outer cylinder and one end of the lever is inserted into the gap between the two circular plates. When the lever swings, it can drive the sealing body to move up and down, thereby closing and opening the lower opening of the inner cylinder.

[0017] Furthermore, a vertical guide tube is provided inside the outer cylinder, through which the circular tube portion of the sealing body passes. The guide tube is used to limit the sealing body to move only up and down.

[0018] Specifically, the drying mechanism includes a dryer and a conveyor belt. The conveyor belt carries the pickling sludge through the drying chamber of the dryer. The end of the conveyor belt is located directly above the outer cylinder. After the pickling sludge reaches the end of the conveyor belt, it will fall directly into the outer cylinder of the batching mechanism.

[0019] Beneficial effects: (1) The pickling sludge pretreatment device of the present invention uses a drying mechanism to pre-dry the pickling sludge and a batching mechanism to realize the automated weighing and batching of the pickling sludge, and efficiently processes the pickling sludge into sand that can be used for metal smelting, which significantly improves the treatment efficiency of the pickling sludge. (2) The pickling sludge pretreatment device of the present invention uses a linear drive, a sealing cone and a pressure sensor to realize the dual functions of weighing and discharging of the weighing cylinder, which is conducive to the simplification of the batching mechanism and the reduction of equipment costs. (3) The pickling sludge pretreatment device of the present invention is equipped with a stirring shaft and a first stirring rod to crush the pickling sludge first and convert the pickling sludge into powdered material, which is conducive to the subsequent reduction treatment. (4) The pickling sludge pretreatment device of the present invention is equipped with a second stirring rod on the stirring shaft, so that the stirring shaft has the dual functions of crushing and mixing at the same time, which is conducive to the simplification of the structure of the batching mechanism and the reduction of equipment costs. Attached Figure Description

[0020] Figure 1 This is a structural diagram of the acid washing sludge pretreatment device in Example 1.

[0021] Figure 2 This is a cross-sectional view of the batching mechanism in Example 1.

[0022] Figure 3 yes Figure 2 Enlarged view of A.

[0023] Figure 4 yes Figure 2 Enlarged view of B.

[0024] Figure 5 This is a cross-sectional view of the sealing body in Example 1.

[0025] Figure 6 This is a schematic diagram of the working principle of the batching mechanism in Example 1 (one of them).

[0026] Figure 7 This is a schematic diagram of the working principle of the batching mechanism in Example 1 (Part 2).

[0027] Figure 8 This is a schematic diagram of the working principle of the batching mechanism in Example 1 (Part 3).

[0028] Figure 9 This is the working principle diagram of the batching mechanism in Example 1 (Part Four).

[0029] Figure 10 This is the fifth working principle diagram of the batching mechanism in Example 1.

[0030] The components are as follows: 100, drying mechanism; 110, dryer; 120, conveyor belt; 200, batching mechanism; 210, outer cylinder; 211, guide cylinder; 212, limiting ring; 213, feeding port; 214, sieve plate; 215, crushing ball; 220, inner cylinder; 230, upper sealer; 231, sealing body; 231-1, circular tube section; 231-2, conical section; 232, circular plate; 233, lever; 240, weighing cylinder; 241, guide rod; 250, lower sealer; 251, sealing cone; 252, linear actuator; 260, powder quantitative feeder; 270, stirring shaft; 271, first stirring rod; 272, second stirring rod; 300, rotary kiln. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to specific embodiments.

[0032] Example 1

[0033] like Figure 1 As shown, the acid washing sludge pretreatment device in this embodiment includes a drying mechanism 100, a batching mechanism 200, and a rotary kiln 300.

[0034] The drying mechanism 100 includes a dryer 110 and a conveyor belt 120. The conveyor belt 120 carries the pickling sludge through the drying chamber of the dryer 110. The end of the conveyor belt 120 is located directly above the feeding mechanism 200. After the pickling sludge reaches the end of the conveyor belt 120, it will fall directly into the feeding mechanism 200. The drying mechanism 100 is used for the preliminary drying of the pickling sludge. Various drying equipment in the prior art can be used for drying pickling sludge, such as steam dryers. The preliminary drying can remove more than 70% of the moisture from the pickling sludge.

[0035] like Figures 2 to 4 As shown, the batching mechanism 200 includes an outer cylinder 210, an inner cylinder 220, an upper sealer 230, a weighing cylinder 240, a lower sealer 250, a powder metering feeder 260, and a stirring shaft 270. The outer cylinder 210 is open at both ends, and the inner cylinder 220 is flared at the top and bottom, with a larger opening at the top and a smaller opening at the bottom. The inner cylinder 220 is fixed inside the outer cylinder 210, and the upper sealer 230 seals the bottom opening of the inner cylinder 220. The upper sealer 230 includes a sealing body 231, a circular plate 232, and a lever 233. Figure 5 As shown, the sealing body 231 includes a cylindrical portion 231-1 and a tapered portion 231-2 located at the bottom end of the cylindrical portion 231-1. Two parallel circular plates 232 are fixed to the cylindrical portion 231-1 of the sealing body 231. Figure 3As shown, the lever 233 is hinged to the wall of the outer cylinder 210, and one end of the lever 233 is inserted into the gap between the two circular plates 232. When the lever 233 swings, it can drive the sealing body 231 to move up and down, thereby closing and opening the lower opening of the inner cylinder 220. A vertical guide cylinder 211 is provided inside the outer cylinder 210. The circular tube portion 231-1 of the sealing body 231 passes through the guide cylinder 211, which restricts the sealing body 231 to move only up and down.

[0036] The weighing cylinder 240 is placed inside the outer cylinder 210 and below the inner cylinder 220. The weighing cylinder 240 is in the shape of a flared mouth with a larger upper opening and a smaller lower opening. The lower sealing device 250 seals the lower opening of the weighing cylinder 240. The lower sealing device 250 includes a sealing cone 251 and a linear actuator 252. The telescopic rod of the linear actuator 252 is connected to the sealing cone 251. The linear actuator 252 lifts the sealing cone 251 so that the sealing cone 251 seals the lower opening of the weighing cylinder 240. A limiting ring 212 is provided on the inner wall of the outer cylinder 210. The upper opening of the weighing cylinder 240 rests on the limiting ring 212, and the weighing cylinder 240 can move up and down within the outer cylinder 210. The limiting ring 212 is used to limit the lowest position of the weighing cylinder 240 when it descends. When the weighing cylinder 240 descends to the lowest position, if the linear actuator 252 drives the sealing cone 251 to continue descending, the sealing cone 251 separates from the weighing cylinder 240, and the lower opening of the weighing cylinder 240 opens. A pressure sensor is installed between the telescopic rod of the linear actuator 252 and the sealing cone 251. The pressure sensor is used to measure the total weight of the sealing cone 251, the weighing cylinder 240, and the material inside the weighing cylinder 240. The weights of the sealing cone 251 and the weighing cylinder 240 are known fixed values. Therefore, the weight of the material inside the weighing cylinder 240 can be indirectly obtained through the measurement data of the pressure sensor.

[0037] The outer cylinder 210 is provided with a feeding port 213. A powder quantitative feeder 260 is connected to the feeding port 213. The powder quantitative feeder 260 stores reducing materials for reducing pickling sludge. The reducing materials mainly include quartz sand and carbon concentrate. The powder quantitative feeder 260 adds a quantitative amount of reducing material to the weighing cylinder 240 according to the weight of the pickling sludge in the weighing cylinder 240. Various powder quantitative feeders 260 available on the market can be used in this invention, such as screw-type powder quantitative feeders 260.

[0038] Pickling sludge is a mud-like substance. After being dried by the drying unit 100, the pickling sludge becomes lumpy. This lumpy dried sludge is not conducive to the subsequent reduction reaction. To solve this problem, this embodiment is equipped with a stirring shaft 270, which is vertically inserted into the outer cylinder 210. A horizontal sieve plate 214 is provided inside the outer cylinder 210, located above the inner cylinder 220. Multiple crushing balls 215 are placed on the sieve plate 214. A horizontal first stirring rod 271 is provided on the stirring shaft 270, located above the sieve plate 214. After the lumpy pickling sludge falls into the outer cylinder 210, it will first stay on the sieve plate 214. At this time, the rotating stirring shaft 270 and the first stirring rod 271 drive the crushing balls 215 to continuously crush the pickling sludge on the sieve plate 214, so that the pickling sludge becomes a powdery substance and then falls through the sieve holes of the sieve plate 214. The powdery pickling sludge is conducive to the subsequent reduction reaction.

[0039] A horizontal second stirring rod 272 is also provided on the stirring shaft 270. The second stirring rod 272 is located between the inner cylinder 220 and the weighing cylinder 240. The second stirring rod 272 is used to stir the reducing material and the pickling sludge, so that the two are mixed more evenly. The height of the second stirring rod 272 should be set reasonably to ensure that the second stirring rod 272 is above the material when the weighing cylinder 240 is full of material, so as to avoid the second stirring rod 272 affecting the weighing of the material. When it is necessary to stir the material, the linear drive 252 drives the weighing cylinder 240 to move upward until the second stirring rod 272 is inserted into the material. Then the second stirring rod 272 rotates to stir the material.

[0040] like Figure 4 As shown, a vertically downward guide rod 241 is provided at the upper eaves of the weighing cylinder 240, and a vertical guide hole is provided in the limiting ring 212. The guide rod 241 is inserted into the guide hole. The guide rod 241 is used to limit the weighing cylinder 240 to move only up and down and not to rotate. This prevents the weighing cylinder 240 from rotating when the second stirring rod 272 is performing a rotating stirring operation.

[0041] like Figure 1 As shown, the upper opening of the outer cylinder 210 of the batching mechanism 200 is aligned with the discharge port of the drying mechanism 100, and the lower opening of the outer cylinder 210 is aligned with the feed port of the rotary kiln 300. After the batching mechanism 200 completes the batching, it feeds the reducing material and the preliminarily dried pickling sludge into the rotary kiln 300 for reduction treatment. After the reduction treatment is completed, a mixture containing metal and metal oxides can be obtained from the discharge port of the rotary kiln 300, which is usually called pyrite. Pyrite is used for subsequent metal smelting.

[0042] The specific dispensing principle of the dispensing mechanism 200 in this embodiment is as follows:

[0043] (1) As Figure 2As shown, initially, the upper sealing device 230 seals the lower opening of the inner cylinder 220, and the lower sealing device 250 seals the lower opening of the weighing cylinder 240;

[0044] (2) Figure 6 As shown, the sludge that has been preliminarily dried falls from the conveyor belt 120 into the outer cylinder 210. The stirring shaft 270 and the first stirring rod 271 drive the crushing ball 215 to continuously crush the pickling sludge on the screen plate 214, so that the pickling sludge becomes a powdery substance and then falls through the screen holes of the screen plate 214 into the inner cylinder 220.

[0045] (3) Figure 7 As shown, lever 233 drives sealing body 231 downward, and powdery pickling sludge in inner cylinder 220 falls into weighing cylinder 240 below. Then lever 233 drives sealing body 231 upward again to seal the lower opening of inner cylinder 220.

[0046] (4) Figure 8 As shown, the linear actuator 252 drives the sealing cone 251 and the weighing cylinder 240 to move upward appropriately, and the weighing cylinder 240 separates from the limiting ring 212. However, the second stirring rod 272 does not come into contact with the powdered pickling sludge in the weighing cylinder 240. At this time, the pressure sensor located between the sealing cone 251 and the telescopic rod of the linear actuator 252 can indirectly measure the weight of the pickling sludge in the weighing cylinder 240. The powder metering feeder feeds an appropriate amount of reducing material into the weighing cylinder 240 according to the weight of the pickling sludge.

[0047] (5) Figure 9 As shown, the linear actuator 252 drives the sealing cone 251 and the weighing cylinder 240 to continue to move upward, so that the second stirring rod 272 is inserted into the material in the weighing cylinder 240. The rotating second stirring rod 272 stirs the material, so that the pickling sludge and the reducing material are mixed evenly.

[0048] (6) Figure 10 As shown, the linear actuator 252 drives the sealing cone 251 and the weighing cylinder 240 downward. After the weighing cylinder 240 contacts the limiting ring 212, the linear actuator 252 drives the sealing cone 251 to continue downward, causing the sealing cone 251 to separate from the weighing cylinder 240. The lower opening of the weighing cylinder 240 opens, and the mixture in the weighing cylinder 240 naturally falls into the rotary kiln 300 below.

[0049] Although embodiments of the present invention have been described in the specification, these embodiments are merely illustrative and should not be construed as limiting the scope of protection of the present invention. Various omissions, substitutions, and modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

Claims

1. A pretreatment device for pickling sludge, characterized in that: It includes a drying unit (100), a batching unit (200), and a rotary kiln (300); The dispensing mechanism (200) includes an outer cylinder (210), an inner cylinder (220), an upper sealer (230), a weighing cylinder (240), a lower sealer (250), and a powder metering feeder (260). The outer cylinder (210) is open at both ends, and the inner cylinder (220) is shaped like a flared mouth with a larger upper opening and a smaller lower opening. The inner cylinder (220) is fixed inside the outer cylinder (210), and the upper sealer (230) seals the lower opening of the inner cylinder (220). The weighing cylinder (240) is placed inside the outer cylinder (210) and located below the inner cylinder (220). The weighing cylinder (240) is capable of weighing its own weight. The weighing cylinder (240) is shaped like a flared mouth with a large upper opening and a small lower opening. The lower sealing device (250) seals the lower opening of the weighing cylinder (240). The outer cylinder (210) is provided with a feeding port (213). A powder quantitative feeder (260) is connected to the feeding port (213). The powder quantitative feeder (260) stores reducing materials for reducing pickling sludge. The powder quantitative feeder (260) adds a quantitative amount of reducing materials to the weighing cylinder (240) according to the weight of the weighing cylinder (240). The upper opening of the outer cylinder (210) is aligned with the discharge port of the drying mechanism (100), and the lower opening of the outer cylinder (210) is aligned with the feed port of the rotary kiln (300). The drying mechanism (100) is used to dry pickling sludge. The lower sealing device (250) includes a sealing cone (251) and a linear actuator (252). The telescopic rod of the linear actuator (252) is connected to the sealing cone (251). The linear actuator (252) lifts the sealing cone (251) so that the sealing cone (251) seals the lower opening of the weighing cylinder (240). The inner wall of the outer cylinder (210) is provided with a limiting ring (212). The upper edge of the weighing cylinder (240) falls on the limiting ring (212). The weighing cylinder (240) can move up and down inside the outer cylinder (210). The limiting ring (212) is used to limit the lowest position of the weighing cylinder (240) downward. A pressure sensor is provided between the telescopic rod of the linear actuator (252) and the sealing cone (251); The batching mechanism (200) also includes a stirring shaft (270), which is vertically inserted into the outer cylinder (210); a horizontal sieve plate (214) is provided inside the outer cylinder (210), the sieve plate (214) is located above the inner cylinder (220), and multiple crushing balls (215) are placed on the sieve plate (214); a horizontal first stirring rod (271) is provided on the stirring shaft (270), the first stirring rod (271) is located above the sieve plate (214); The stirring shaft (270) is also provided with a horizontal second stirring rod (272). The second stirring rod (272) is located between the inner cylinder (220) and the weighing cylinder (240). When the weighing cylinder (240) is full of material, the second stirring rod (272) is located above the material.

2. The acid pickling sludge pretreatment device according to claim 1, characterized in that: The weighing cylinder (240) has a vertically downward guide rod (241) at its upper eaves, and the limiting ring (212) has a vertical guide hole inside, into which the guide rod (241) is inserted.

3. The acid pickling sludge pretreatment device according to claim 2, characterized in that: The upper sealing device (230) includes a sealing body (231), a circular plate (232), and a lever (233). The sealing body (231) includes a circular tube (231-1) and a conical part (231-2) located at the bottom end of the circular tube (231-1). Two parallel circular plates (232) are fixed to the circular tube (231-1) of the sealing body (231). The lever (233) is hinged to the wall of the outer cylinder (210), and one end of the lever (233) is inserted into the gap between the two circular plates (232).

4. The acid pickling sludge pretreatment device according to claim 3, characterized in that: The outer cylinder (210) has a vertical guide cylinder (211) inside, and the circular tube portion (231-1) of the sealing body (231) passes through the guide cylinder (211).

5. The acid pickling sludge pretreatment device according to claim 1, characterized in that: The drying mechanism (100) includes a dryer (110) and a conveyor belt (120), which carries pickling sludge through the drying chamber of the dryer (110), with the end of the conveyor belt (120) located directly above the outer cylinder (210).

6. The acid pickling sludge pretreatment device according to claim 5, characterized in that: The dryer (110) is a steam dryer (110).

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