A processing and crushing device for calcium thiosulfate

Abstract

The application relates to the technical field of chemical raw material processing equipment, in particular to a processing and crushing device for calcium thiosulfate; the device comprises a grinding box, a crushing box, a feeding hopper, a tail gas treatment mechanism and a circulating cooling mechanism. The device integrates crushing, grinding, cooling, sealing, inerting and tail gas treatment, has compact structure, occupies small area and can continuously and closedly process the calcium thiosulfate. A U-shaped circulating cooling channel is arranged in the fixed crushing roller, a grinding cooling cavity of the grinding box is also connected with a cooling medium, the crushing area and the grinding area are forcedly cooled, and the materials are effectively prevented from being decomposed due to frictional heat. The top of the crushing box is connected with a tail gas absorption box, a vacuumizing mechanism is arranged, the system is in a micro-negative pressure state, sulfur-containing gas and dust generated during the processing are sucked into the absorption box for treatment, and zero emission is realized.

Description

Technical Field

[0001] This invention relates to the field of chemical raw material processing equipment technology, and in particular to a processing and crushing device for calcium thiosulfate, which is especially suitable for heat-sensitive, hygroscopic, corrosive materials that are prone to generating toxic dust during processing. Background Technology

[0002] Calcium thiosulfate is commonly used industrially as a gold leaching agent, photographic fixing agent, and fertilizer additive. However, calcium thiosulfate is highly heat-sensitive (it begins to decompose at 43–49°C), hygroscopic, and produces irritating and toxic gases containing sulfur oxides (such as sulfur dioxide) and combustible dust during crushing and grinding. Most existing crushing equipment is not specifically designed for the unique properties of this material, resulting in the following problems: (1) Risk of thermal decomposition: The friction between the crushing roller and the material generates heat, which can easily lead to local overheating and decomposition of the material, affecting the purity of the product.

[0003] (2) Dust and gas leakage: Toxic dust and gas generated during the processing escape from the feed inlet and gaps, endangering the health of operators and polluting the environment.

[0004] (3) Moisture absorption and clumping: After absorbing moisture, the material adheres to the inner wall of the crushing chamber and grinding chamber, causing blockage and reducing processing efficiency.

[0005] (4) Safety hazards: When combustible dust reaches a certain concentration in the air and encounters an ignition source, it may cause a dust explosion.

[0006] Therefore, there is an urgent need to develop a specialized processing device that integrates crushing, grinding, cooling, sealing, nitrogen protection, and exhaust gas treatment. Summary of the Invention

[0007] The purpose of this invention is to provide a processing and crushing device for calcium thiosulfate, which solves the problems of thermal decomposition, dust leakage, safety hazards and limited functionality of existing equipment when processing heat-sensitive, hygroscopic and corrosive materials.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: This invention provides a processing and crushing apparatus for calcium thiosulfate, comprising: A grinding box is provided inside, which has a grinding cooling chamber. The grinding cooling chamber is vertically concave to form a conical inner wall. A grinding body adapted to the conical inner wall is provided inside the grinding box. A rotation drive mechanism for driving the grinding body is provided at the bottom of the grinding box. A guide pipe with a valve is also provided at the bottom of the grinding box. A crushing box, which is connected to the top of the crushing box, has a fixed crushing roller and at least one rotating crushing roller horizontally placed inside it. The outer walls of the fixed crushing roller and the rotating crushing roller are provided with crushing teeth or crushing threads, and the two work together to crush. The crushing box is also connected to an exhaust gas treatment mechanism. A pressure sensor is installed inside the crushing box. The feed hopper is connected to the top of the crushing box and has an openable and closable sealing cover on its top.

[0009] In this embodiment, the bottom of the grinding box is provided with support legs; a drive shaft is installed inside the grinding box, and the rotary drive mechanism is a reducer and a motor that are connected to the drive shaft for transmission. A grinding body and a scraper are provided on the drive shaft. The scraper is in close contact with the bottom surface of the grinding box. A discharge port is provided at the bottom of the grinding box and the discharge port is connected to the guide pipe. The ground material is scraped into the discharge port by the scraper and then enters the guide pipe.

[0010] Furthermore in this embodiment, the grinding body comprises two conical or frustum-shaped bodies joined together, and is coaxial with the drive shaft.

[0011] Furthermore in this embodiment, the two ends of the fixed crushing roller are fixedly installed inside the crushing box. It is a hollow tube, and a U-shaped channel is formed inside it by partitions. The two joints of the U-shaped channel are respectively connected to a circulating cooling mechanism through liquid supply branch pipes.

[0012] In this embodiment, the two ends of the rotating crushing roller are mounted on the side wall of the crushing box via bearings, and a transmission drive wheel is provided at one end extending out of the crushing box. The transmission drive wheel is connected to an active drive wheel via a transmission belt, and the active drive wheel is driven by a servo motor.

[0013] Furthermore in this embodiment, the sealing cover is hinged to the feed hopper and locked together by a snap fastener; a stepped surface is provided at the bottom of the sealing cover, and a sealing airbag is provided around the stepped surface.

[0014] Furthermore, in this embodiment, multiple air inlets are provided on the side wall of the crushing box to blow air toward the rotating crushing roller. The air inlets are connected to a nitrogen source through an air guide pipe. An electrically controlled valve is provided on the air guide pipe, and the electrically controlled valve is electrically connected to a controller.

[0015] In this embodiment, the exhaust gas treatment mechanism further includes an exhaust pipe connected to the top of the crushing box, an exhaust gas absorption box connected to the exhaust pipe, and a vacuuming mechanism that provides negative pressure to the exhaust gas absorption box. A duct valve is installed on the extraction pipe, and the duct valve is electrically connected to a controller.

[0016] In this embodiment, the circulating cooling mechanism further includes a coolant tank, a delivery pump for conveying the cooling medium inside the coolant tank, a supply pipe connected to the outlet of the delivery pump, and a return pipe connected to the coolant tank; a temperature sensor and a liquid level sensor are installed inside the coolant tank, and a replenishment pipe is also installed on its top. One end of the U-shaped channel inside the fixed crushing roller is connected to the liquid supply pipe through the first liquid supply branch pipe, and the other end is connected to the liquid return pipe through the first liquid return branch pipe. A flow valve is installed on the first liquid supply branch pipe, and the flow valve is electrically connected to a controller.

[0017] Furthermore in this embodiment, the grinding cooling chamber is connected to the liquid supply pipe via a second liquid supply branch pipe and also to the liquid return pipe via a second liquid return branch pipe; wherein, the interface between the second liquid supply branch pipe and the grinding cooling chamber is higher than the interface position of the second liquid return branch pipe.

[0018] Compared with the prior art, the beneficial technical effects of the present invention are as follows: This application integrates crushing, grinding, cooling, sealing, inerting, and exhaust gas treatment into a single compact structure with a small footprint, enabling continuous and closed-loop processing of calcium thiosulfate. The fixed crushing roller has a U-shaped circulating cooling channel, and the grinding cooling chamber of the grinding box is also circulated with a cooling medium, providing forced cooling to the crushing and grinding zones respectively, effectively preventing material decomposition due to frictional heat. Furthermore, the feed hopper is equipped with a sealing cover and a sealing airbag, and nitrogen can be introduced into the crushing box to create a slightly positive pressure or inert gas protective environment, isolating oxygen and moisture to prevent material oxidation and moisture absorption, while also suppressing the risk of dust explosion. Simultaneously, the top of the crushing box is connected to an exhaust gas absorption box. A vacuum mechanism maintains a slightly negative pressure in the system, drawing sulfur-containing gases and dust generated during processing into the absorption box for treatment, achieving zero emissions. Attached Figure Description

[0019] The invention will be further described below with reference to the accompanying drawings. Figure 1 This is a schematic diagram of the cross-section of the crushing device. Figure 2 This is an external schematic diagram of the processing and crushing device; Figure 3 Enlarged schematic diagram of the sealing cover on the crushing device; Figure 4 for Figure 1 Schematic diagram of section AA; Figure 5 This is a schematic diagram of the grinding chamber structure inside the crushing device. Figure 6 for Figure 1 Schematic diagram of the BB section.

[0020] Explanation of reference numerals in the attached drawings: 1. Grinding box; 11. Grinding cooling chamber; 12. Conical inner wall; 13. Grinding body; 14. Scraper; 15. Rotary drive mechanism; 16. Discharge port; 2. Crushing box; 21. Fixed crushing roller; 22. Rotary crushing roller; 221. Transmission drive wheel; 222. Transmission belt; 223. Active drive wheel; 224. Servo motor; 3. Feed hopper; 311. Hinge; 3 12. Fastener; 31. Sealing cap; 4. Nitrogen source; 41. Gas duct; 42. Electrically controlled valve; 5. Exhaust gas absorption box; 51. Extraction pipe; 52. Gas duct valve; 6. Vacuuming mechanism; 7. Coolant tank; 71. Transfer pump; 72. Liquid supply pipe; 721. First liquid supply branch pipe; 722. Second liquid supply branch pipe; 73. Return pipe; 731. First return branch pipe; 732. Second return branch pipe; 74. Flow valve. Detailed Implementation

[0021] This embodiment discloses a processing and crushing device for calcium thiosulfate, including a grinding box 1, a crushing box 2, and a feeding hopper 3.

[0022] The grinding chamber 1 has a grinding cooling cavity 11 inside, the vertical inner wall of which is a conical inner wall 111 (larger at the top and smaller at the bottom). A grinding body 12, adapted to the shape of the conical inner wall 111, is installed inside the grinding chamber 1. The grinding body 12 is composed of two frustums joined together and coaxially mounted on a drive shaft. The drive shaft is rotated by a rotary drive mechanism 14 at the bottom. A grinding gap, wider at the top and narrower at the bottom, is formed between the conical surface of the grinding body 12 and the conical inner wall 111. A scraper 13 is also fixed on the drive shaft, and the scraper 13 is in close contact with the inner bottom surface of the grinding chamber 1. A discharge port 15 is provided at the bottom of the grinding chamber 1, and the discharge port 15 is connected to a guide pipe 16 with a valve. Support legs are provided at the bottom of the grinding chamber 1 to create space for the installation of the rotary drive mechanism 14, which can specifically be a reducer and a motor.

[0023] The crushing box 2 is fixedly connected to the top of the grinding box 1 and communicates with the interior of the grinding box 1. Inside the crushing box 2, a fixed crushing roller 21 and two rotating crushing rollers 22 are horizontally arranged, symmetrically about the fixed crushing roller 21. The two ends of the fixed crushing roller 21 are fixed to the side wall of the crushing box 2; its interior is a hollow tube, separated by partitions to form a U-shaped channel. The two ends of the rotating crushing roller 22 are mounted on the side wall of the crushing box 2 via bearings; one end extends out of the box and is equipped with a drive wheel 211. The drive wheel 211 is connected to a drive wheel 223 via a drive belt 222, and the drive wheel 223 is driven by a servo motor 224. Both crushing rollers have crushing teeth 221 (or crushing threads) on their outer peripheral walls; when they rotate relative to each other, they squeeze and shear the material, crushing it.

[0024] The side wall of the crushing chamber 2 is provided with multiple air inlets facing the rotating crushing roller 22. The air inlets are connected to a nitrogen source 4 via an air guide pipe 41, and an electrically controlled valve 42 is installed on the air guide pipe 41. The electrically controlled valve 42 is electrically connected to a controller (PLC). A pressure sensor is also installed inside the crushing chamber 2 to monitor the internal pressure.

[0025] The feed hopper 3 is fixed to the top of the crushing box 2 and communicates with the crushing box 2. The top of the feed hopper 3 is provided with an openable and closable sealing cover 31, which is hinged by a hinge 311 and locked by a buckle 312. A sealing airbag is provided around the bottom stepped surface of the sealing cover 31 to achieve airtightness when closed.

[0026] The circulating cooling mechanism includes a coolant tank 7 (containing cooling water or ethylene glycol solution), a delivery pump 71, a supply pipe 72, and a return pipe 73. One end of the U-shaped channel of the fixed crushing roller 21 is connected to the supply pipe 72 via a first supply branch pipe 721, and the other end is connected to the return pipe 73 via a first return branch pipe 731. A flow valve 74 is installed on the first supply branch pipe 721. The upper part of the side wall of the grinding cooling chamber 11 is connected to the supply pipe 72 via a second supply branch pipe 722, and the lower part is connected to the return pipe 73 via a second return branch pipe 732, forming a cooling jacket. The coolant enters from the top and flows out from the bottom, ensuring that the cooling chamber is filled with the medium.

[0027] The exhaust gas treatment mechanism includes an extraction pipe 51 (connecting to the top of the crushing chamber 2), an exhaust gas absorption chamber 5, and a vacuum mechanism 6. An air guide valve 52 is installed on the extraction pipe 51. When the vacuum mechanism 6 operates, it maintains a slight negative pressure (e.g., -500 to -200 Pa) inside the crushing chamber 2 and grinding chamber 1, drawing the generated dust and sulfur dioxide gas into the exhaust gas absorption chamber 5 for treatment before venting. The vacuum mechanism 6 is a vacuum pump. The exhaust gas absorption chamber 5 is filled with alkaline solution or activated carbon.

[0028] The working process of this embodiment is as follows: When using, first open the sealing cover 31, put the calcium thiosulfate block material to be processed (recommended particle size ≤50mm) into the feed hopper 3, close the sealing cover 31 and lock the buckle 312, and inflate the sealing airbag to achieve airtightness.

[0029] Then, nitrogen purging is performed. Specifically, the electronically controlled valve 42 of the nitrogen source 4 is activated to fill the crushing chamber 2 with nitrogen, while the vacuum pumping mechanism 6 is activated to reduce the oxygen concentration inside the system to a safe value (e.g., <5%) and maintain a slight negative pressure. The pressure sensor provides real-time feedback, and the controller automatically adjusts the balance between filling and pumping.

[0030] Next, crushing begins. The servo motor 224 is started, driving the rotating crushing roller 22 to rotate (speed <200 rpm). The fixed crushing roller 21 remains stationary. The material is squeezed and sheared between the fixed crushing roller 21 and the rotating crushing roller 22, breaking it into small particles (approximately 3-10 mm). Simultaneously, the circulating cooling mechanism is activated, and the conveying pump 71 delivers coolant (0-10℃) into the U-shaped channel inside the fixed crushing roller 21 to remove the frictional heat generated during crushing and prevent the material from overheating and decomposing. The dust and gas generated during crushing are promptly extracted by the top exhaust pipe 51.

[0031] Next, grinding is performed, and the crushed small particles fall into the conical grinding chamber of grinding box 1 by gravity. The rotary drive mechanism 14 is started to drive the grinding body 12 to rotate (the speed is adjustable). The material is further ground to the required fineness (e.g., 1-4 mm) between the grinding body 12 and the conical inner wall 111. Cooling medium is continuously introduced into the grinding cooling chamber 11 to control the temperature of the grinding zone below 40°C.

[0032] Finally, the ground material falls to the bottom of the grinding chamber 1, and the rotating scraper 13 scrapes it toward the discharge port 15 and discharges it through the guide pipe 16. The guide pipe 16 can be connected to an airtight rotary valve or directly enter a sealed container, and the discharge rhythm is controlled by the valve.

[0033] Throughout the entire processing, the vacuum mechanism 6 operates continuously, and sulfur-containing gases and dust enter the exhaust gas absorption box 5 through the extraction pipe 51 (where odors are adsorbed by activated carbon), and are discharged after meeting the standards.

[0034] After processing is complete, stop feeding first, and continue running the crushing, grinding, cooling, and extraction systems for 5-10 minutes to empty the material in the chamber and replace any residual gas. Then, shut down each mechanism in sequence. Regularly clean the exhaust gas absorption box and replace the absorbent liquid or activated carbon.

[0035] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A processing and crushing device for calcium thiosulfate, characterized in that, include: A grinding box (1) is provided inside, which has a grinding cooling chamber (11). The grinding cooling chamber (11) is vertically recessed to form a conical inner wall (11). A grinding body (12) adapted to the conical inner wall (11) is provided inside the grinding box (1). A rotary drive mechanism (14) for driving the grinding body (12) is provided at the bottom of the grinding box (1). A guide pipe (16) with a valve is also provided at the bottom of the grinding box (1). A crushing box (2) is connected to the top of the crushing box (2). A fixed crushing roller (21) and at least one rotating crushing roller (22) are horizontally placed inside the crushing box (2). The outer walls of the fixed crushing roller (21) and the rotating crushing roller (22) are provided with crushing teeth or crushing threads. The two work together to crush. The crushing box (2) is also connected to a tail gas treatment mechanism. A pressure sensor is installed inside the crushing box (2). The feed hopper (3) is connected to the top of the crushing box (2) and has an openable and closable sealing cover (31) on its top.

2. The processing and crushing apparatus for calcium thiosulfate according to claim 1, characterized in that: The grinding box (1) is provided with support legs at the bottom; a drive shaft is installed inside the grinding box (1), and the rotary drive mechanism (14) is a reducer and a motor that are connected to the drive shaft for transmission. A grinding body (12) and a scraper (13) are provided on the drive shaft. The scraper (13) is close to the bottom surface of the grinding box (1). A discharge port (15) is provided at the bottom of the grinding box (1). The discharge port (15) is connected to the guide pipe (16). The ground material is scraped into the discharge port (15) by the scraper (13) and enters the guide pipe (16).

3. The processing and crushing apparatus for calcium thiosulfate according to claim 2, characterized in that: The grinding body (1) comprises two conical or frustum bodies joined together, and is coaxial with the drive shaft.

4. The processing and crushing apparatus for calcium thiosulfate according to claim 1, characterized in that: The two ends of the fixed crushing roller (21) are fixedly installed inside the crushing box (2). It is a hollow tube, and a U-shaped channel is formed inside it by partitions. The two joints of the U-shaped channel are respectively connected to a circulating cooling mechanism through liquid supply branch pipes.

5. The processing and crushing apparatus for calcium thiosulfate according to claim 4, characterized in that: The two ends of the rotating crushing roller (22) are mounted on the side wall of the crushing box (2) by bearings. One end of the roller extending out of the crushing box (2) is provided with a transmission drive wheel (211). The transmission drive wheel (211) is connected to the active drive wheel (223) by a transmission belt (222). The active drive wheel (223) is driven by a servo motor (224).

6. The processing and crushing apparatus for calcium thiosulfate according to claim 1, characterized in that: The sealing cover (31) is hinged to the feed hopper (3) by a hinge (311) and the two are locked together by a buckle (312); a stepped surface is provided at the bottom of the sealing cover (31), and a sealing airbag is provided around the stepped surface.

7. The processing and crushing apparatus for calcium thiosulfate according to claim 1, characterized in that: Multiple air inlets are provided on the side wall of the crushing box (2) to blow air onto the rotating crushing roller (22). The air inlets are connected to a nitrogen source (4) through an air guide pipe (41). An electric control valve (42) is provided on the air guide pipe (41), and the electric control valve (42) is electrically connected to a controller.

8. The processing and crushing apparatus for calcium thiosulfate according to claim 1, characterized in that: The exhaust gas treatment mechanism includes an exhaust pipe (51) connected to the top of the crushing box (2), an exhaust gas absorption box (5) connected to the exhaust pipe (51), and a vacuuming mechanism (6) that provides negative pressure to the exhaust gas absorption box (5). A gas guide valve (52) is installed on the gas extraction pipe (51), and the gas guide valve (52) is electrically connected to a controller.

9. The processing and crushing apparatus for calcium thiosulfate according to claim 4, characterized in that: The circulating cooling mechanism includes a coolant tank (7), a delivery pump (71) for delivering the cooling medium inside the coolant tank (7), a supply pipe (72) connected to the outlet of the delivery pump (71), and a return pipe (73) connected to the coolant tank (7). A temperature sensor and a liquid level sensor are installed inside the coolant tank (7), and a replenishment pipe is also installed on its top. One end of the U-shaped channel inside the fixed crushing roller (21) is connected to the liquid supply pipe (72) through the first liquid supply branch pipe (721), and the other end is connected to the liquid return pipe (73) through the first liquid return branch pipe (731). A flow valve (74) is installed on the first liquid supply branch pipe (721), and the flow valve (74) is electrically connected to a controller.

10. The processing and crushing apparatus for calcium thiosulfate according to claim 9, characterized in that: The grinding cooling chamber (11) is connected to the liquid supply pipe (72) through the second liquid supply branch pipe (722) and is also connected to the liquid return pipe (73) through the second liquid return branch pipe (732); wherein, the interface between the second liquid supply branch pipe (722) and the grinding cooling chamber (11) is higher than the interface position of the second liquid return branch pipe (732).

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