Sulfur purification method and device for sulfur-containing solid waste

Abstract

The present application relates to the purification processing technical field of sulfur paste, sulfur cake, sulfur residue and other sulfur-containing solid waste, in particular to a sulfur-containing solid waste sulfur purification method and device, comprising a pretreatment step of crushing and screening treatment of sulfur solid waste, a solid-liquid separation step, a two-stage heating step, a distillation purification step, a condensation treatment step and a cooling slicing step, when the liquid sulfur after purification is cooled and sliced, the liquid sulfur to be cooled is always in heat exchange cooling with the just input cooling medium (cooling initial liquid) with the lowest temperature at the initial cooling, which greatly improves the cooling speed of the liquid sulfur, and in turn improves the processing efficiency of the cooling slicing, reduces the energy consumption, avoids the trouble that part of the liquid sulfur cannot be solidified and sliced due to cooling factors, and reduces the residue of the liquid sulfur during the cooling slicing.

Description

Technical Field

[0001] This invention relates to the field of purification and processing technology for sulfur-containing solid wastes such as sulfur paste, sulfur cake, and sulfur slag, specifically to a method and apparatus for purifying sulfur from sulfur-containing solid wastes. Background Technology

[0002] Sulfur, as a fundamental raw material for modern industry, plays a core role in sulfuric acid production in the chemical industry (accounting for over 70% of global sulfuric acid production). In the metallurgical industry, it is used for sulfide ore flotation and precious metal purification. In the pesticide industry, it is a key component in the preparation of organosulfur fungicides (such as mancozeb). In the rubber industry, it dominates the supply of vulcanizing agents for vulcanization processes. In the fuel industry, it is used in the production of sulfur-based additives. In the paper industry, it is indispensable in sulfate pulping processes. According to data from the 2024 *China Chemical Industry Yearbook*, my country's annual sulfur consumption has exceeded 18 million tons and is increasing at an average annual rate of 5%. However, domestic sulfur production can only meet 35% of the demand, with annual imports remaining stable at over 12 million tons. The dependence on foreign sulfur has long been above 60%, mainly relying on sulfur imported as a byproduct of natural gas from the Middle East and North America.

[0003] With the large-scale development of global sulfur-containing crude oil and natural gas resources, sulfur recovery units have become indispensable supporting equipment in large-scale coal chemical plants, natural gas purification plants, refineries, and petrochemical plants when processing coal, sulfur-containing natural gas, and sulfur-containing crude oil. These units rely on wet desulfurization technology to obtain crude sulfur as a byproduct. However, because coke oven gas contains a large amount of coal tar and ash, these substances enter the crude sulfur, resulting in a low sulfur content, a black color, and unsuitable for direct industrial use, thus having low value. Furthermore, the recovered crude sulfur cannot be directly sold on the market, and processing costs are high. Further purification is needed to meet the needs of industrial production.

[0004] Chinese invention patent application number 202210255786.6 discloses a method for wet desulfurization and resource recovery of coke oven gas, which purifies sulfur-containing solid waste by hot melting, filtration and distillation to obtain industrial-grade sulfur with a purity of over 99.95%.

[0005] However, this technology is limited by the temperature of the cooling medium when cooling pure sulfur liquid into slices, resulting in low processing efficiency and frequent maintenance, which severely limits the processing efficiency of sulfur purification. Therefore, a more efficient sulfur purification method is urgently needed. Summary of the Invention

[0006] To address the above problems, this invention provides a method and apparatus for purifying sulfur from sulfur-containing solid waste. By ensuring that the purified liquid sulfur is cooled and sliced ​​during the initial cooling process, the liquid sulfur is constantly cooled and exchanged with the newly introduced, lowest-temperature cooling medium (initial cooling liquid) during the initial cooling phase. This significantly increases the cooling rate of the liquid sulfur, thereby improving the processing efficiency of the cooled slices and reducing energy consumption.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A method for purifying sulfur from sulfur-containing solid waste includes the following steps: Step a: First, the sulfur-containing solid waste is crushed and screened. The treated sulfur-containing solid waste is then heated to melt at a temperature of 150°C. Step b: The molten sulfur-containing waste liquid is subjected to solid-liquid separation, and the separated sulfur-containing liquid and waste residue are separated. Step c: The separated sulfur-containing liquid is heated in two stages. After the first heating to 250°C, it is heated to 350°C and then held at that temperature. Step d: The sulfur-containing liquid mixture heated to 350°C is heated to 450°C and subjected to distillation purification to separate sulfur vapor and sulfur-containing waste residue. Step e: The distilled sulfur vapor is condensed to form liquid sulfur; Step f: After the liquid sulfur is cooled, it is sliced ​​and cut into solid sulfur for output. In step f, the liquid sulfur to be cooled is always in heat exchange with the initial cooling liquid during the initial cooling process. The initial cooling liquid is the cooling medium that initially participates in the cooling.

[0008] As an improvement, the sulfur-containing waste residue in step d is recycled to step b, where it is mixed with sulfur-containing liquid waste and then subjected to solid-liquid separation again.

[0009] Furthermore, the present invention also provides an apparatus for the sulfur purification method for sulfur-containing solid waste described above, comprising, in the following order of processing: Waste hopper, material conveyor, sulfur melting kettle, filtration equipment, buffer tank, first heating kettle, second heating kettle, distillation kettle, condenser, sulfur storage tank, slicer and conveyor belt; The waste hopper stores sulfur-containing solid waste particles. The lifting conveyor lifts and transports the sulfur-containing solid waste particles to the quantitative feeder at the top of the sulfur melting kettle. The sulfur melting kettle receives the sulfur-containing solid waste particles supplied by the waste hopper and heats and melts them. The filtration device filters the sulfur-containing waste liquid output from the sulfur melting kettle. The buffer tank buffers the separated sulfur-containing liquid. The first heating kettle and the second heating kettle sequentially perform two-stage heating treatment on the sulfur-containing liquid. The distillation kettle performs distillation purification treatment on the heated sulfur-containing liquid. The condenser cools the distilled sulfur vapor with water. The sulfur storage tank stores the cooled pure sulfur liquid. The slicer cools the pure sulfur liquid into a solid and then slices it. The conveyor belt outputs the sliced ​​sulfur fragments.

[0010] As an improvement, the outlet of the sulfur melting kettle and the inlet of the filtration equipment are connected by a first sulfur pump and a pipeline.

[0011] As an improvement, a slag storage tank for storing waste slag is provided below the slag outlet of the filtration device.

[0012] As an improvement, the waste residue outlet of the distillation vessel and the feed inlet of the filtration equipment are connected by a waste residue pump and a pipeline.

[0013] As an improvement, the outlet of the sulfur storage tank is connected to the inlet of the top of the slicer via a second sulfur pump and a corresponding pipeline.

[0014] As an improvement, the slicer includes a housing, a cooling drum, a cutting blade, a heating coil, and a drive unit; The top of the casing is provided with a liquid inlet, the bottom of the casing is provided with a liquid outlet, the liquid outlet is connected to the sulfur storage tank through a pipe, and the side of the casing is provided with a discharge outlet. The cooling drum is rotatably mounted inside the housing. The cooling drum is provided with a cooling channel for the flow of cooling medium, and the outer wall of the cooling drum is covered with pure sulfur liquid fed into the inlet. The cutter is located at the discharge port and is in contact with the outer wall of the cooling drum. The cutter scrapes off the pure sulfur solids on the cooling drum. The heating coil is located at the bottom of the housing, and a heating medium flows inside the heating coil; The drive device is located outside the housing and drives the cooling drum to rotate.

[0015] As an improvement, the cooling drum includes a rotating shaft, an outer cylinder, an inner cylinder, and a planetary gear set; The two ends of the rotating shaft are rotatably mounted on the housing. The rotating shaft is driven to rotate by the driving device, and the two ends of the rotating shaft are respectively provided with a cooling medium inlet and a cooling medium outlet communicating with the cooling channel. The outer cylinder is sleeved on the rotating shaft, and the outer cylinder is connected to the rotating shaft through a planetary gear set. The outer cylinder is also rotated in the opposite direction as the rotating shaft rotates. The inner cylinder is coaxially disposed inside the outer cylinder. The inner cylinder and the inner sidewall of the outer cylinder cooperate to form a cooling channel. Both ends of the inner cylinder are provided with a plurality of permanent magnets. The inner sidewall of the housing is fixedly installed with magnets corresponding to the permanent magnets. The magnets can be permanent magnets or electromagnets.

[0016] As an improvement, a number of partition plates are raised on the outer side wall of the inner cylinder. The partition plates divide the cooling channel into a number of cooling zones in the middle and liquid inlet and liquid outlet zones at both ends. A liquid inlet pipe is provided at the top of the inner cylinder, connecting the top of the cooling zone and the liquid inlet zone. A liquid outlet pipe is provided at the bottom of the inner cylinder, connecting the bottom of the cooling zone and the liquid outlet zone. Each cooling zone on the inlet pipe is equipped with a piston extrusion unit driven by the rotating shaft, which extrudes the cooling medium in the inlet pipe into the cooling zone.

[0017] The beneficial effects of this invention are as follows: (1) In the present invention, when the purified liquid sulfur is cooled and sliced, the liquid sulfur to be cooled is always cooled by heat exchange with the newly input, lowest temperature cooling medium (initial cooling liquid) during the initial cooling, which greatly improves the cooling speed of the liquid sulfur, thereby improving the processing efficiency of the cooled slices, avoiding the problem that some liquid sulfur cannot be solidified and sliced ​​due to cooling factors, greatly improving the solidification and slicing efficiency of the purified liquid, and reducing the residue of liquid sulfur during cooling and slicing. (2) This invention constructs a closed-loop recycling system of "distillation-separation-reuse" by reusing the sulfur-containing waste residue generated during the distillation process. By increasing the sulfur content in a targeted manner, the gas-liquid balance conditions of the distillation process are optimized, and the interference of low-boiling-point impurities is reduced. At the same time, due to the increase in the sulfur concentration of the system, the heat load required during the distillation process is reduced, thereby achieving a dual optimization of energy consumption and efficiency. (3) This invention has formed a highly integrated closed-loop production system by intelligently transforming and automating the core equipment such as crushing, feeding, melting, filtration and separation, heating, distillation, condensation and cooling slicing in the purification device. The entire purification device can achieve 24-hour continuous operation without manual intervention, from the crushing and screening of sulfur-containing solid waste to the separation of impurities, distillation and condensation of sulfur elements and the collection of finished products. (4) This invention has innovatively modified the slicer to construct a set of high-efficiency cooling modes with fixed input and output of cooling medium. This fixed input and output of cooling medium ensures that when liquid sulfur is fed into the slicer from the inlet at the top of the slicer and spread onto the cooling drum, the newly fed cooling medium in the slicer always maintains the lowest temperature and can contact the liquid sulfur spread on the cooling drum in a timely and accurate manner. This greatly improves the cooling speed of the liquid sulfur, shortens the cooling time, and achieves the shortest cooling path. This optimizes the overall structural design of the slicer and eliminates the need for a large volume as required by traditional slicers to meet the long cooling process.

[0018] In summary, this invention has the advantages of high processing efficiency, energy saving and environmental protection, and economic practicality. It is especially suitable for the field of recycling and processing technology of sulfur-containing solid waste and has broad application prospects. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the method flow of Embodiment 1 of the present invention; Figure 2 This is a front view schematic diagram of the device in Embodiment 2 of the present invention; Figure 3 This is a side view of the slicer structure in Embodiment 2 of the present invention; Figure 4 This is a schematic diagram of the three-dimensional structure of the slicer in Embodiment 2 of the present invention; Figure 5 This is a cross-sectional view of the slicer in Embodiment 2 of the present invention; Figure 6 This is a schematic diagram of the three-dimensional structure of the cooling drum in Embodiment 2 of the present invention; Figure 7 This is a schematic cross-sectional view of the cooling drum in Embodiment 2 of the present invention. Figure 1 ; Figure 8 This is a schematic cross-sectional view of the cooling drum in Embodiment 2 of the present invention. Figure 2 ; Figure 9 This is a three-dimensional cross-sectional view of the inner cylinder in Embodiment 2 of the present invention; Figure 10 This is a schematic diagram of the internal structure of the outer cylinder in Embodiment 3 of the present invention; Figure 11 This is a three-dimensional structural diagram of the piston extrusion unit in Embodiment 3 of the present invention.

[0020] The labels in the attached diagram are as follows: 1. Waste hopper; 2. Conveyor; 3. Sulfur melting kettle; 31. First sulfur pump; 4. Filter equipment; 41. Slag storage tank; 5. Buffer tank; 51. Third sulfur pump; 6. First heating kettle; 7. Second heating kettle; 8. Distillation kettle; 81. Waste slag pump; 9. Condenser; 10. Sulfur storage tank; 101. Second sulfur pump; 11. Slicer; 11. Liquid inlet; 110. Machine casing; 111. Cooling drum; 112. Cooling channel; 1120. Cooling zone; 11201. Liquid inlet zone; 11202. Liquid outlet zone; 11203. Rotating shaft; 1121. Cooling medium inlet; 11211. Cooling medium outlet; 11212. Outer cylinder; 11. 22, flow guide baffle 11220, magnet 11221, flow guide hole 11222, inner cylinder 1123, permanent magnet 11231, partition plate 11232, liquid inlet pipe 11233, liquid outlet pipe 11234, piston extrusion unit 11235, piston cylinder 11236, piston 11237, crank connecting rod 11238, crank 11239, planetary gear set 1124, center gear 11241, planetary gear 11242, gear ring 11243, cutter 113, heating coil 114, drive device 115, liquid outlet 116, discharge port 117, conveyor belt 12. Detailed Implementation

[0021] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0022] The specific embodiments of the present invention will be described in detail below. However, it should be noted that the scope of protection of the present invention is not limited to these specific embodiments, but is determined by the claims in the appendix.

[0023] All publications, patent applications, patents, and other references mentioned in this specification are incorporated herein by reference. Unless otherwise defined, all technical and scientific terms used in this specification have the meanings commonly understood by those skilled in the art. In case of conflict, the definitions in this specification shall prevail.

[0024] When this specification uses the prefixes "known to those skilled in the art," "prior art," or similar terms to derive materials, substances, methods, steps, apparatus, or components, the objects derived from such prefixes cover those conventionally used in the art at the time the invention was proposed, but also include those that are not currently commonly used but will become generally recognized in the art as suitable for similar purposes.

[0025] It should be noted that the two or more aspects (or embodiments) disclosed in the context of this specification can be arbitrarily combined with each other, and the resulting technical solutions (such as methods or systems) are part of the original disclosure of this specification and also fall within the protection scope of this invention.

[0026] Unless otherwise specified, all percentages, parts, ratios, etc. mentioned in this specification are based on weight, unless being based on weight would not be in accordance with the common understanding of those skilled in the art.

[0027] Example 1: like Figure 1 As shown, a method for purifying sulfur from sulfur-containing solid waste includes the following steps: Step a: Pre-treatment of sulfur-containing solid waste using a three-stage crushing and screening system: First, the lumpy solid waste is crushed to a particle size ≤50mm by a jaw crusher, then further crushed to ≤10mm by a cone crusher, and finally classified by a vibrating screen, requiring that the proportion of undersize material ≤2mm ≥95%. The screened material is then conveyed to a jacketed melting reactor, where the temperature is controlled at 150±5℃ using electric heating. This temperature setting is based on the physicochemical properties of elemental sulfur (melting point 115.21℃) and most metal sulfides, ensuring that elemental sulfur is fully melted while avoiding the generation of harmful gases at high temperatures. The reactor is equipped with a stirring device with a rotation speed controlled at 60r / min, allowing the material to be uniformly melted within 90 minutes. Step b: The molten material (sulfur-containing waste liquid) is conveyed to a horizontal screw centrifuge via a screw conveyor (the filtration and separation of sulfur-containing waste liquid in this embodiment is not limited to a horizontal screw centrifuge; any equipment that meets the requirements of this application for filtration and separation of sulfur-containing waste liquid is within the scope of protection of this application). The rotation speed is set to 3000 r / min and the centrifugal force field strength is 2000G to achieve effective separation of solid and liquid phases. The separated sulfur-containing liquid (sulfur content ≥65%) enters an intermediate buffer tank, while the waste residue (mainly containing silicates and metal oxides) is conveyed to the waste residue temporary storage area for subsequent stabilization treatment. The buffer tank is equipped with an electric heating and insulation device to maintain the temperature at 130℃ to prevent the sulfur liquid from solidifying. At the same time, a liquid level sensor is configured to be interlocked with the first sulfur pump to ensure continuous material supply to subsequent sections. Step c: The sulfur-containing liquid undergoes a two-stage gradient heating treatment: The first stage uses a shell-and-tube heat exchanger with heat transfer oil as the heat medium to raise the material temperature to 250±3℃. This stage mainly removes low-boiling-point impurities (such as water vapor and light hydrocarbons) and lasts for 40 minutes. The second stage of heating is transferred to a thin-film evaporator with a vacuum system, where the temperature is raised to 350℃ under an absolute pressure of 10kPa and held for 60 minutes. The vacuum environment lowers the boiling point of sulfur (the boiling point of sulfur at atmospheric pressure is 444.6℃), while heavy metal sulfides gradually precipitate at this temperature. During the holding process, a scraping device (rotation speed 80r / min) is activated to prevent scaling and enhance heat transfer efficiency. Step d: The material at 350°C is pumped to the distillation vessel using a plunger pump and a gradient heating process is adopted: First, the temperature is raised to 420°C within 30 minutes to decompose the polysulfides, and then the temperature is raised to 450±2°C. At this time, elemental sulfur is converted into sulfur vapor (molecular form) and enters the condensation system. The sulfur-containing waste residue (mainly metal sulfates) generated during the distillation process is periodically discharged from the bottom of the vessel, and after water quenching, it is sent to step b for reuse. Step e: Sulfur vapor enters the tube condenser and adopts a segmented condensation process: the cooling medium in the first stage is 120°C heat transfer oil (to avoid direct solidification of sulfur vapor), which initially cools the sulfur vapor into liquid sulfur (temperature about 160°C). Step f: The pre-cooled liquid sulfur is then transported to a drum-type cooling slicing machine. The drum of this machine is filled with circulating cooling water. Under the action of gravity, the liquid sulfur is evenly spread on the surface of the drum. After contacting the low-temperature drum, it quickly solidifies into sulfur flakes with a thickness of about 3 mm within a very short time. In step f, during the initial cooling of the liquid sulfur being transported to the drum-type cooling slicer, it constantly exchanges heat with the cooling medium (initial cooling liquid) that is always kept at the lowest temperature in the newly input slicer.

[0028] It should be noted that in existing sulfur purification and processing methods, the purified sulfur liquid is mostly cooled and solidified by cooling slicing to achieve rapid cooling, solidification, and output. However, due to the limitations of existing cooling slicing technology, when the sulfur liquid is evenly spread on the surface of the drum under gravity, it is impossible to guarantee that the sulfur liquid will always exchange heat with the initial cooling liquid (the reason for this is that the drum inside the cooling slicing equipment is always rotating, and the inlet of the flow channel inside the drum is constantly changing with the rotation of the drum). As a result, within the same cooling path and cooling time, some of the sulfur liquid can be cooled to solidification, while some of the sulfur liquid only solidifies on the surface. The conventional solution is to increase the diameter of the drum and extend the cooling path and cooling time of the sulfur on the drum to ensure that the sulfur is completely solidified. This results in an increase in the size of the cooling slicing machine and a decrease in processing efficiency.

[0029] Example 2: like Figures 2-9 As shown, this embodiment provides an apparatus for the sulfur purification method of sulfur-containing solid waste described in Embodiment 1, comprising a waste hopper 1, a material conveyor 2, a sulfur melting kettle 3, a filter device 4, a buffer tank 5, a first heating kettle 6, a second heating kettle 7, a distillation kettle 8, a condenser 9, a sulfur storage tank 10, a slicer 11, and a conveyor belt 12. The waste hopper 1 stores sulfur-containing solid waste particles. The lifting conveyor 2 lifts and transports the sulfur-containing solid waste particles to the quantitative feeder at the top of the sulfur melting kettle 3. The sulfur melting kettle 3 receives the sulfur-containing solid waste particles supplied by the waste hopper 1 and heats and melts them. The outlet of the sulfur melting kettle 3 is connected to the inlet of the filtration device 4 via a first sulfur pump 31 and a pipeline. The filtration device 4 filters the sulfur-containing waste liquid output from the sulfur melting kettle 3. A slag storage tank 41 for storing waste slag is provided below the slag outlet of the filtration device 4. The buffer tank 5 buffers the separated sulfur-containing liquid. The buffer tank 5 is connected to the first heating kettle 6 via a third sulfur pump 51 and a pipeline. The heating kettle 6 and the second heating kettle 7 sequentially perform two-stage heating treatment on the sulfur-containing liquid. The distillation kettle 8 performs distillation purification treatment on the heated sulfur-containing liquid. The waste residue outlet of the distillation kettle 8 is connected to the feed inlet of the filter equipment 4 through a waste residue pump 81 and a pipeline. The condenser 9 cools the distilled sulfur vapor with water. The sulfur storage tank 10 stores the cooled pure sulfur liquid. The liquid outlet of the sulfur storage tank 10 is connected to the liquid inlet 110 at the top of the slicer 11 through a second sulfur pump 101 and a pipeline. The slicer 11 cools the pure sulfur liquid into a solid and then slices it. The conveyor belt 12 outputs the sliced ​​sulfur fragments.

[0030] It should be noted that the structures of the sulfur melting kettle 3, the filtration device 4, the buffer tank 5, the first heating kettle 6, the second heating kettle 7, the distillation kettle 8, and the condenser 9 in Example 1 have been described and will not be repeated here.

[0031] This embodiment focuses on the creative improvement of slicing in this application. In some embodiments, as a preferred embodiment, the structure of the slicer 11 includes a housing 111, a cooling roller 112, a cutter 113, a heating coil 114, and a drive device 115. The top of the casing 111 is provided with an inlet 110 for inputting liquid sulfur, and the bottom of the casing 111 is provided with a drain port 116 (for discharging sulfur remaining inside the casing). The drain port 116 is connected to the sulfur storage tank 10 through a pipe (the discharged sulfur is returned to the sulfur storage tank 10 and then condensed again). The casing 111 is also provided with a discharge port 117 on one side, which is used to output solid sulfur after solidification and slitting. The cooling drum 112 is rotatably disposed inside the housing 111. The cooling drum 112 is provided with a cooling channel 1120 for the flow of cooling medium. The outer wall of the cooling drum 112 is covered with pure sulfur liquid input from the liquid inlet 110. The rotation direction of the cooling drum 112 is from the liquid inlet 110 to the discharge outlet 117. The cutter 113 is disposed at the discharge port 117. The cutter 113 is disposed in contact with the outer wall of the cooling drum 112, and the cutter 113 scrapes off the pure sulfur solid on the cooling drum 112. The cutter 113 is disposed at an angle, with the top end in contact with the cooling drum 112 and the bottom end located at the discharge port 117. The heating coil 114 is located at the bottom of the housing 111. A heating medium flows inside the heating coil 114. The function of the heating coil 114 is to remelt the sulfur remaining in the housing 111, so that it can be output and reused. The drive device 115 is located outside the housing 111. The drive device 115 drives the cooling roller 112 to rotate. The drive device 115 uses a motor and belt drive.

[0032] In some embodiments, preferably, the cooling drum 112 includes a rotating shaft 1121, an outer cylinder 1122, an inner cylinder 1123, and a planetary gear set 1124; The two ends of the rotating shaft 1121 are rotatably mounted on the housing 111. The rotating shaft 1121 is driven to rotate by the driving device 115. The two ends of the rotating shaft 1121 are respectively provided with a cooling medium inlet 11211 and a cooling medium outlet 11212 communicating with the cooling channel 1120. The cooling medium inlet 11211 and the cooling medium outlet 11212 are respectively connected to an external cooling water circulation system. The cooling water circulation system cools the cooling water after heat exchange and then inputs it back into the slicer to participate in the work. The outer cylinder 1122 is sleeved on the rotating shaft 1121. The outer cylinder 1122 and the rotating shaft 1121 are connected by a planetary gear set 1124. The outer cylinder 1122 rotates in the opposite direction to the rotating shaft 1121. Specifically, the planetary gear set 1124 includes a central gear 11241, planetary gears 11242, and a gear ring 11243. The central gear 11241 is coaxially sleeved with the rotating shaft 1121, and the planetary gears 11242 are mounted on the side wall of the housing 111. The planetary gears 11242 can rotate on their own axis as the central gear 11241 rotates, but the planetary gears 11242 rotate around the central gear 11241. The orbital degree of freedom is locked. The gear ring 11243 is installed on the side wall of the outer cylinder 1122. The gear ring 11243 is arranged around the planetary gear 11242. Therefore, the working process of the planetary gear set 1124 is that the rotating shaft 1121 rotates, which drives the central gear 11241 to rotate. The central gear 11241 drives the planetary gear 11242 to rotate. Then the planetary gear 11242 drives the gear ring 11243 to rotate coaxially and in the opposite direction to the central gear 11241. That is, the outer cylinder 1122 and the rotating shaft 1121 rotate coaxially and in the opposite direction. The tooth ratio of the central gear 11241 to the gear ring 11243 is 1:N, where N is a natural integer other than 0. The inner cylinder 1123 is coaxially disposed inside the outer cylinder 1122. The inner cylinder 1123 and the inner sidewall of the outer cylinder 1122 cooperate to form a cooling channel 1120. Both ends of the inner cylinder 1123 are provided with a plurality of permanent magnets 11231. A magnet 11221 corresponding to and cooperating with the permanent magnets 11231 is fixedly installed on the inner sidewall of the housing 111 (as a non-limiting embodiment, the magnet 11221 can be a permanent magnet or an electromagnet). Through the magnetic attraction between the permanent magnets 11231 and the magnet 11221, the rotational freedom of the inner cylinder 1123 is locked, keeping the inner cylinder in a fixed state relative to the outer cylinder. Since the inner cylinder 1123 is fixed, and a plurality of partition plates 11232 protrude from the outer sidewall of the inner cylinder 1123, these partition plates 11232 divide the cooling channel 1120 into several cooling channels located in the middle. The inner cylinder 1123 has a cooling zone 11201 (cooling zone 11201 is arranged in a ring) and liquid inlet zone 11202 and liquid outlet zone 11203 located at both ends. The top of the inner cylinder 1123 is provided with a liquid inlet pipe 11233 connecting the top of the cooling zone 11201 and the liquid inlet zone 11202, and the bottom of the inner cylinder 1123 is provided with a liquid outlet pipe 11234 connecting the bottom of the cooling zone 11201 and the liquid outlet zone 11203. Therefore, a cooling system is formed. With the flow channel 1120 fixed, the circulating cooling water flows from the cooling medium inlet 11211 to the liquid inlet area 11202, and then enters the cooling area 11201 through the liquid inlet pipe 11233. The cooling water in the cooling area 11201 flows to the liquid outlet pipe 11234, and then reaches the liquid outlet area 11203 through the liquid outlet pipe 11234. Finally, it is discharged outward through the cooling medium outlet 11212 through the liquid outlet area 11203, thus achieving circulation.

[0033] Example 3: like Figure 7 , 10As shown in Figure 11, in some preferred embodiments, since the inlet pipe 11233 needs to transport cooling water to the top of the outer cylinder, thus forming a heat exchange effect between the sulfur liquid that has just been spread on the outer wall of the outer cylinder and the newly input cooling water with the lowest temperature, the inlet pipe 11233 can only rely on the pumping pressure of the cooling water to force the cooling water into the cooling zone 11201, resulting in the problem of difficult cooling water flow. Therefore, innovatively, a piston extrusion unit 11235 driven by the rotating shaft 1121 is provided on the inlet pipe 11233 for each cooling zone 11201. The piston extrusion unit 11235 forces the cooling medium in the inlet pipe 11233 into the cooling zone 11201. Specifically, the piston extrusion unit 11235 consists of a piston cylinder 11236 and a piston. The unit comprises 11237, 11238, and 11239. The piston cylinder 11236 is located below the liquid inlet pipe 11233 and is connected to the liquid inlet pipe 11233. The piston 11237 is slidably located inside the piston cylinder 11236. The crank connecting rod 11238 is hinged to the lower part of the piston 11237. The crank 11239 is located on the rotating shaft 1121. The crank connecting rod 11238 and the crank 11239 are hinged together. As the rotating shaft 1121 rotates, the piston extrusion unit 11235 continuously pushes and extrudes the cooling water in the liquid inlet pipe 11233 to the corresponding cooling zone 11201. At the same time, in conjunction with the pumping pressure of the liquid inlet pipe 11233 itself, the cooling water is rapidly delivered to the cooling zone 11201, ensuring the fluidity of the cooling water in the cooling zone 11201.

[0034] Furthermore, a flow guide baffle 11220 protrudes from the inner wall of the outer cylinder 1122 into the cooling zone 11201. A flow guide hole 11222 is provided at the root of the connection between the flow guide baffle 11220 and the outer cylinder 1122, so that when the cooling water in the cooling zone 11201 flows, it first flows along the part of the cooling zone 11201 close to the inner wall of the outer cylinder 1122, which ensures the cooling temperature on the outer cylinder 1122 and further improves the cooling speed on the outer cylinder 1122.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for purifying sulfur from sulfur-containing solid waste, characterized in that, Includes the following steps: Step a: First, the sulfur-containing solid waste is crushed and screened. The treated sulfur-containing solid waste is then heated to melt at a temperature of 150°C. Step b: The molten sulfur-containing waste liquid is subjected to solid-liquid separation, and the separated sulfur-containing liquid and waste residue are separated. Step c: The separated sulfur-containing liquid is heated in two stages. After the first heating to 250°C, it is heated to 350°C and then held at that temperature. Step d: The sulfur-containing liquid mixture heated to 350°C is heated to 450°C and subjected to distillation purification to separate sulfur vapor and sulfur-containing waste residue. Step e: The distilled sulfur vapor is condensed to form liquid sulfur; Step f: After the liquid sulfur is cooled, it is sliced ​​and cut into solid sulfur for output. The slicer (11) includes a housing (111), a cooling drum (112), a cutter (113), a heating coil (114), and a drive device (115). The top of the casing (111) is provided with a liquid inlet (110), the bottom of the casing (111) is provided with a liquid outlet (116), the liquid outlet (116) is connected to the sulfur storage tank (10) through a pipe, and the side of the casing (111) is provided with a discharge port (117). The cooling drum (112) is rotatably disposed inside the housing (111). The cooling drum (112) is provided with a cooling channel (1120) for flowing cooling medium, and the outer wall of the cooling drum (112) is covered with pure sulfur liquid input from the liquid inlet (110). The cutter (113) is disposed at the discharge port (117), the cutter (113) is disposed in contact with the outer wall of the cooling drum (112), and the cutter (113) scrapes off the pure sulfur solid on the cooling drum (112); The heating coil (114) is located at the bottom of the housing (111), and a heating medium flows inside the heating coil (114); The drive device (115) is disposed outside the housing (111), and the drive device (115) drives the cooling roller (112) to rotate. The cooling drum (112) includes a rotating shaft (1121), an outer cylinder (1122), an inner cylinder (1123), and a planetary gear set (1124). The two ends of the rotating shaft (1121) are rotatably mounted on the housing (111). The rotating shaft (1121) is driven to rotate by the driving device (115). The two ends of the rotating shaft (1121) are respectively provided with a cooling medium inlet (11211) and a cooling medium outlet (11212) communicating with the cooling channel (1120). The outer cylinder (1122) is sleeved on the rotating shaft (1121). The outer cylinder (1122) and the rotating shaft (1121) are connected by a planetary gear set (1124). The outer cylinder (1122) is rotated in the opposite direction as the rotating shaft (1121) rotates. The inner cylinder (1123) is coaxially disposed inside the outer cylinder (1122). The inner cylinder (1123) and the inner sidewall of the outer cylinder (1122) cooperate to form a cooling channel (1120). Both ends of the inner cylinder (1123) are provided with a plurality of permanent magnets (11231). The inner sidewall of the housing (111) is fixedly installed with magnets (11221) that correspond to and cooperate with the permanent magnets (11231). The inner cylinder (1123) has several partition plates (11232) protruding on its outer side wall. These partition plates (11232) divide the cooling channel (1120) into several cooling zones (11201) in the middle and liquid inlet zones (11202) and liquid outlet zones (11203) at both ends. The top of the inner cylinder (1123) is provided with a liquid inlet pipe (11233) that connects the top of the cooling zone (11201) with the liquid inlet zone (11202). The bottom of the inner cylinder (1123) is provided with a liquid outlet pipe (11234) that connects the bottom of the cooling zone (11201) with the liquid outlet zone (11203). Each cooling zone (11201) on the inlet pipe (11233) is provided with a piston extrusion unit (11235) driven by the rotating shaft (1121). The piston extrusion unit (11235) extrudes the cooling medium in the inlet pipe (11233) into the cooling zone (11201). In step f, the liquid sulfur to be cooled is always in heat exchange with the initial cooling liquid during the initial cooling process. The initial cooling liquid is the cooling medium that initially participates in the cooling.

2. The method for sulfur purification from sulfur-containing solid waste according to claim 1, characterized in that: The sulfur-containing waste residue in step d is recycled to step b, where it is mixed with the sulfur-containing waste liquid and then subjected to solid-liquid separation again.

3. An apparatus for the sulfur purification method of sulfur-containing solid waste according to any one of claims 1-2, characterized in that, In the order of processing, the following are included: Waste hopper (1), material conveyor (2), sulfur melting kettle (3), filtration equipment (4), buffer tank (5), first heating kettle (6), second heating kettle (7), distillation kettle (8), condenser (9), sulfur storage tank (10), slicer (11) and conveyor belt (12); The waste hopper (1) stores sulfur-containing solid waste particles. The lifting conveyor (2) lifts and transports the sulfur-containing solid waste particles to the quantitative feeder at the top of the sulfur melting kettle (3). The sulfur melting kettle (3) receives the sulfur-containing solid waste particles supplied by the waste hopper (1) and heats and melts them. The filtration device (4) filters the sulfur-containing waste liquid output from the sulfur melting kettle (3). The buffer tank (5) buffers the separated sulfur-containing liquid. The first heating kettle (6) and the second heating kettle (7) sequentially perform two-stage heating treatment on the sulfur-containing liquid. The distillation kettle (8) performs distillation purification treatment on the heated sulfur-containing liquid. The condenser (9) cools the distilled sulfur vapor with water. The sulfur storage tank (10) stores the cooled pure sulfur liquid.

4. The apparatus according to claim 3, characterized in that: The outlet of the sulfur melting kettle (3) and the inlet of the filter equipment (4) are connected by a pipeline in conjunction with the first sulfur pump (31).

5. The apparatus according to claim 3, characterized in that, The filter device (4) is provided with a slag storage tank (41) for storing waste slag below the slag outlet.

6. The apparatus according to claim 3, characterized in that: The waste residue outlet of the distillation kettle (8) and the feed inlet of the filter equipment (4) are connected by a waste residue pump (81) and a pipeline.

7. The apparatus according to claim 3, characterized in that: The outlet of the sulfur storage tank (10) is connected to the inlet (110) at the top of the slicer (11) via a second sulfur pump (101) and a pipeline.

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